Metered electricity.
Delivered kWh × an agreed tariff. Set service level, response, billing, escalation and contract term.
Back to the Sunroof storyA real project.
Sunroof / Project room / 19 October 2026
A real project.
A clear route forward.
The route to our first paying customer: validate demand, agree a viable electricity service, fund the installation and prove daily operation.
First proof14 days
Measure one agreed load.
Validation cash$2,254
Study + proposal. No solar plant.
Current stageQualify one site
Customer and quotes unconfirmed.
01The opportunity
One customer.
A service worth repeating.
Start with a defined routine load at a private hospital or hotel in Greater Banjul. Measure demand, compare the customer’s existing energy costs and build an offer they will accept. Only repeat the configuration once operation and capital recovery are credible.
An operated system.
Financing, qualified installation, monitoring, maintenance, repairs and separately agreed capacity upgrades.
No hidden assumptions.
Grid energy, generator fuel, major roof works and clinical UPS are explicitly scoped. No unapproved export income.
The deciding question
Can one measured load support a customer-accepted tariff that pays for the service and the capital?
The alternatives we must beat
Buying equipment
A customer can buy a system from local installers. Compare our lifetime delivered cost with that ownership option.
Existing solar leases
Greenlink already publishes lease references. Our proposed advantage is accountable metered delivery, transparent billing and dependable local support — still to be demonstrated.
Grid + generator
A better grid reduces the value of our backup. Measure avoidable fuel, maintenance and interrupted work rather than count every existing cost as a saving.
Greenlink’s published Gambian project referencesLease and installed-project evidence rechecked 19 October 2026. Customer-specific asset and contract status remains unverified.
PURA’s 2023 determined rates, still displayed when checked 19 October 2026. Verify the actual bill, meter class and any later tariff decision before pricing. These are grid benchmarks, not Sunroof prices or savings. PURA source.
02The launch plan
Four steps.
Everyone knows their part.
Each step ends in a decision. Founder responsibilities coordinate the work; qualified specialists perform the required design, safety and legal checks.
Coordinator / Lamin
Qualify + measure
LaminLead
Arrange three site conversations, collect bills and select one suitable site. Confirm whether it uses an existing roof or needs a new roof/canopy. Coordinate the electrician, roof survey and 14-day load recording.
Joachim
With qualified designers, check demand, roof/foundation constraints and grid/generator boundaries. Identify which proposed platform variants could fit.
Dominik
Check the electricity buyer, payment route, current costs and a preliminary service offer.
Decision gate
A measured load, a named buyer, a roof route and a clear service boundary.
Coordinator / Joachim
Configure + price
Lamin
Price local mounting or a new roof structure with qualified partners. Check fabrication, transport, installation, spares and service availability.
JoachimLead
Lead the first configuration library: compatible PV, battery, inverter/control families, permitted capacity steps and roof variants. Prepare a repeatable bill of materials, drawings and acceptance tests; qualify site-specific changes.
Dominik
Build a configuration-based price catalogue and complete cash plan. Separate new-roof and platform-development costs. Confirm funding, approval requirements and a customer-reviewed kWh offer.
Decision gate
One qualified reference configuration, a fully quoted cash plan and an agreed electricity offer.
Coordinator / Dominik
Contract + commission
Lamin
Prepare installation logistics and the local team. Record assembly steps, local supply sources and training so the next site can reuse the process.
Joachim
Qualified specialists install and commission the reference system. Verify all operating/protection modes; record as-built changes and complete the reusable handover, test and maintenance package.
DominikLead
Secure funding and the customer agreement before ordering. Agree metering, tariff, invoicing, service response and insurance.
Decision gate
An accepted reference installation, required permissions and a documented package for repeat delivery.
Coordinator / Lamin
Operate + improve
LaminLead
Run local service with a shared checklist and spare-parts list. Track site issues, maintain customer contact and train the local team.
Joachim
Review measured operation and revise the configuration library. Expand only with compatible modules inside qualified capacity, roof and connection limits.
Dominik
Track collections, full operating costs, reserves and capital recovery. Compare repeat-site economics; approve the next configuration only from measured results and complete quotes.
Decision gate
A proven reference service and a documented, costed route to the next site.
The next conversation needs three things
A real bill.An asset list.Consent to measure.
03The first test
Measure first.
Spend with a purpose.
Visit three prospects. Rent a calibrated logger for 14 days at one qualified site. A qualified electrician installs it; an engineer interprets the result. No panels, battery or generator are bought.
Proposed cash before receipts$2,254 USD
$1,670 costs + $334 reserve + $250 refundable deposit.
| Input | USD |
|---|---|
| Energy logger rental · 2 weeks | $360 |
| Qualified electrician visits | $200 |
| Customer / site visits | $120 |
| Independent engineering analysis | $400 |
| Local field support | $140 |
| Data + printing | $30 |
| Initial tariff / contract review | $150 |
| Local travel + consumables | $120 |
| Provisional local taxes / permissions | $150 |
| Test-cost subtotal | $1,670 |
| 20% contingency | $334 |
| Refundable deposit · liquidity | $250 |
| Total cash required | $2,254 |
The deposit is cash tied up, not an immediate expense. No sales, resale or assumed refund is deducted. All local prices and permission/tax allowances require written offers. Founders’ time is unpaid; founder pay and travel are excluded.
What this test can prove
A measured load profile, a common specification for comparable quotes, and a customer-reviewed kWh offer. It does not prove installed-system performance or uninterrupted supply.
The $360 logger line is an allowance anchored to a dated UK hire benchmark, not an offer delivered to The Gambia. Confirm calibration, local availability, rental rights, transport and deposit terms before booking.
Reconcile study costs with later engineering provisions. Do not mechanically add the validation and deployment budgets.
04The first installation
Everything the
service needs.
Choose a qualified platform configuration, then adapt its capacity and roof interface to the site. A safe, billable service still needs site rights, commissioning and a local operating team.
The product we intend to repeatA modular platform.
Keep standard Configure locally Check every site
A modular platform.
Configured to the site.
Build the first project as a reference configuration for the next. Select compatible capacity blocks and an approved roof variant; reuse the engineering package, operating process and spare-parts logic.
Qualified component families, control and metering interfaces, drawings, commissioning tests, monitoring, billing, maintenance and training.
PV and storage capacity, mounting or new-roof variant, layout, cable routes and compatible grid/generator connections.
Demand, roof condition or foundations, wind/structural loads, corrosion exposure, drainage, electrical protection, connection rules and permits.
What we standardise before repeating the first project
- A small configuration catalogueDefine qualified PV, battery and inverter/control families, permitted combinations, capacity increments and expansion limits. No fixed kW/kWh steps or supplier selection are validated yet.
- Two roof routesExisting roof: a verified mounting option. New roof: a repeatable structure and weatherproof covering, with PV integrated into the overall design. PV panels alone are not assumed to be a watertight roof.
- One repeatable delivery packageA standard bill of materials and price catalogue, drawings and checklists, configured site adaptations, installer training, common spares and one maintenance/billing process.
- A rule for exceptionsIf a site falls outside the qualified roof types, loads or connection limits, seek another standard variant or treat it as a separately approved exception. Feed useful lessons back into the platform catalogue.
Joachim leads the technical configuration library with qualified designers; Lamin tests local buildability, roof supply and installation; Dominik defines configuration pricing, funding, service terms and repeat economics.
Platform development is part of the first-project brief, not an existing certified product. Standardisation is intended to simplify repeat delivery; installation time, cost reductions and unlimited expansion are not claimed.
20 kWpSolar DC capacity
≈40 kWhNominal battery storage
Inherited sizing hypothesis, not a customer design. Measure demand first. Nominal storage is not usable AC energy or guaranteed backup duration.
01Solar modulesGenerate electricity for the agreed daytime load.
Example: 40 × 500 Wp = 20 kWp
Count illustration: 40 × 500 Wp = 20 kWp. No module model or supplier is selected. Confirm shading, usable roof, layout, yield, module certificates, hot-weather output and local warranty support. Actual string design and module count belong in the installer’s quotation. Select a qualified module family that can be reused in the platform; define permitted array/string increments and the inverter/roof limits before expansion.
02Roof route + mountingFit the building, using a repeatable roof interface.
Existing roof or new roof/canopy variant
Existing roof: survey condition and structure, then select a qualified mounting variant with suitable rails/fixings, corrosion protection, roof seals, safe access and installation-at-height arrangements. New roof/canopy: qualified partners must design and quote structure, foundations, weatherproof covering, drainage and PV mounting together. Panels alone are not assumed watertight. Reuse approved variants where suitable; verify local structural/wind exposure at every site. New structures and major repairs are outside the existing-roof reference allowance.
03Battery + BMSStore energy for agreed evening and backup needs.
Example: 8 × 5.12 kWh = 40.96 kWh
Illustrative LiFePO4 format: 8 × 5.12 kWh = 40.96 kWh nominal. No battery model or supplier is selected. Include a compatible battery-management system, cabinet/rack, battery disconnects/protection and temperature/environment provisions. Usable AC energy is lower and depends on operating reserve, losses and ageing. Choose capacity from required duty; storage can be reduced if the measured service does not need it. Specify permitted battery increments, compatible inverter/BMS combinations and operating limits; later additions require technical approval.
04Inverter + solar chargingTurn solar and stored energy into usable building power.
One compatible engineered package
Select suitable inverter/charger equipment and the solar conversion path: integrated MPPT, separate MPPT chargers or an AC-coupled PV inverter, as designed. Avoid double-counting integrated functions. Phase count, continuous/peak kW or kVA and charge limits follow measured loads and the battery; 20 kWp of panels does not specify inverter output.
05Cables + electrical protectionConnect and protect the complete installation.
A fully specified AC / DC package
Include rated cables/connectors, containment, distribution boards, isolators, fuses/breakers, designed surge protection, earthing/bonding and any required lightning/fire provisions. The designer specifies ratings and quantities from routes, fault conditions, equipment and applicable rules. No generic component basket substitutes for the protection design.
06Metering + kWh billingBill the electricity covered by the agreed service.
Customer meter + source measurement
Define the customer delivery boundary and an accepted billing meter, calibration/verification and readings. Measure grid and generator contributions where needed to allocate costs; a controller’s monitoring meter is not automatically a lawful revenue meter. Agree tariff, source-energy/fuel treatment and invoice checks.
07Smart controller + connectionCoordinate energy, record faults and arrange response.
Controller · router / SIM · monitoring
A compatible EMS/controller, required communication cables and a site-appropriate internet/data plan. Configure monitoring, local records when offline, alerts, permissions and backups. Start with standard tools and a simple invoice/maintenance ledger; a custom platform is not required for site one. Reuse one qualified control/metering interface and commissioning template across configurations.
08Grid interface + surplus controlUse the grid safely and control spare energy.
Existing connection · approved design
Assess the existing connection, protection, metering and transfer/maintenance-bypass arrangement. Obtain the applicable NAWEC/PURA requirements, including anti-islanding and permitted operating mode. Surplus can serve suitable on-site demand or charge storage; when neither is possible, curtail. Export only under an approved technical and commercial arrangement.
09Existing generator + interfaceCover agreed loads when solar and storage are insufficient.
Reuse only if suitable · no new purchase assumed
Survey the actual generator, controls, service condition, phase/rating and fuel responsibility. Specify compatible transfer/interlocking, input limits, start/stop integration if supported and maintenance bypass with the qualified team. A dual-input inverter is one possible architecture, not a selected model. The reference budget excludes a new generator and its fuel.
10Installation + ongoing serviceDeliver a working service and keep it operating.
Qualified team · handover · spares
Include engineering, installation/lifting, independent checks as needed, commissioning, as-built drawings, test records, operator training, warranties and initial spares. Agree cleaning/inspection, fault response, local technician access and replacement reserve. Acceptance must test actual grid, storage, generator, metering and protection modes. Reuse the reference installation checklist, training package, documentation format and spare-parts list, recording any approved site-specific changes.
For hospitals: define the routine loads first.
Theatre, ICU, medical UPS and clinical redundancy need a separate qualified design. Payment disputes must not lead to improvised disconnection of clinical circuits.
One platform brief. Comparable configured offers.
- Design inputsLoad file, peaks, phases, selected circuits, bills, outages, existing-roof survey or new-roof brief, backup duty and existing assets.
- EquipmentQualified module families, exact configuration and quantities, compatible interfaces, roof variant, protection, cable routes, metering, controls and expansion limits.
- Delivered scopeFreight, battery transport documents, clearance/tax treatment, installation, approvals, training, warranty and support.
- Acceptance + cashContracting and asset-owning entity, legal importer, test protocol, exclusions, payment stages, insurance and cash until first collections.
GAM-Solar and Shyben are existing enquiry routes for installation and generator expertise, not selected providers. Local legal, electrical, structural, metering and insurance specialists must qualify the final scope.
05The customer pipeline
Real names.
A reason to start talking.
Fifteen researched prospects from the Gambia work. Begin with Sharab, Africmed and African Princess to compare one defined routine load. Check current assets, contracts, decision authority and payment capacity before proposing a system.
Research leads, not customers, partners or confirmed demand. Prospect evidence retains its 15–16 October observation dates. Africmed services and African Princess room inventory were rechecked 19 October; Sharab’s direct page timed out in that recheck.
01Private healthcareSharab Hospital LtdKanifing Layout · OIC Road, next to Election House
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The hospital publishes 24/7 opening, laboratory, pharmacy, digital X-ray, ultrasound and surgical services.
- Why investigate
- A useful place to test a defined daytime electricity service alongside an existing clinical power arrangement.
- First question
- Would management share 12 months of electricity/fuel records, show the current supply system and permit a 14-day survey of agreed circuits?
- Who to ask
- Hospital administration + facilities/electrical lead + finance
- What to check
- Hypothesis to measure: administration, lighting, suitable cooling and an agreed diagnostic load. Clinical/critical circuits need separate specialist approval.
- Still unknown
- Existing PV/storage/generator inventory, roof rights, clinical boundaries, current bills, budget and willingness to sign a kWh contract are unverified.
02Private healthcareAfricmed International HospitalBrusubi Turntable · opposite Trust Bank (FCDO listing)
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator lists 24-hour service, laboratory medicine, pharmacy, radiology, surgery and intensive care. FCDO lists it as a private facility.
- Why investigate
- A second hospital conversation to compare a real daily load and the value of defined backup with the Sharab case.
- First question
- Which block has a measurable power cost or service gap, and who can approve the site access, supply scope and payments?
- Who to ask
- Hospital management + facilities/electrical lead + finance
- What to check
- Hypothesis to measure: a non-critical daytime service block first. Do not include ICU/theatre loads in a generic 20 kWp system.
- Still unknown
- No measured consumption, outages, installed equipment, available roof area or credit evidence is public evidence for our model.
03HospitalityAfrican Princess Beach HotelKotu Beach · Serrekunda
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The hotel advertises 141 rooms/suites; room amenities include air conditioning and mini-fridges.
- Why investigate
- A commercial comparison with healthcare: test a separately metered daytime hotel load rather than offer to power the entire property.
- First question
- Can the general manager and engineer identify one costed daytime load, provide seasonal bills and disclose any existing solar or energy contract?
- Who to ask
- General manager + chief engineer/facilities + finance or owner representative
- What to check
- Hypothesis to measure: an agreed cooling or service block. Verify occupied/quiet-season profiles and the existing generation mix.
- Still unknown
- Published room count is not a load study. Existing PV, backup equipment, ownership, roof rights and purchasing appetite are unknown.
04Privately managed charitable healthcareWestfield Clinic TrustWestfield Junction · opposite Trust Bank
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The clinic describes 16 inpatient beds, round-the-clock emergency cover and charitable status; it relies on service income and donations.
- Why investigate
- A smaller facility to investigate if an authorised budget-holder or sponsor can support a sustainable electricity agreement.
- First question
- Which trustee/manager controls an energy contract, what budget pays the bills, and could a non-critical block be surveyed?
- Who to ask
- Clinic management + trustees/budget-holder + facilities/electrical adviser
- What to check
- Hypothesis: a ring-fenced administrative/daytime load. Maternity, surgery and emergency continuity need separate clinical design.
- Still unknown
- Charitable status does not establish ability to pay. Confirm the funding source, current assets and any donor restrictions.
05Private healthcare · directory-verifiedMedicare ClinicBrufut Coastal Road · Brusubi/Brufut area
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- FCDO’s September 2026 list identifies a private clinic at Brufut Coastal Road and publishes an organisational contact route.
- Why investigate
- A reserve healthcare prospect after on-site identity, operating scope and a meaningful daytime load are confirmed.
- First question
- Can local management confirm the active site, decision maker, current supply and whether there is a paid energy need to assess?
- Who to ask
- Clinic administrator/owner + facilities adviser + budget-holder
- What to check
- No equipment list is adopted from older directories. Establish the actual circuits and load before sizing anything.
- Still unknown
- The operator website could not be validated. Do not treat older bed/equipment counts or public-directory contact details as a current site survey.
06HospitalityThe Kairaba Beach HotelKololi Beach
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator describes a Kololi beach hotel with accommodation, pools and dining; the Gambia Hotel Association lists it.
- Why investigate
- A larger, seasonal hotel prospect for one defined service block after owner and existing energy contracts are identified.
- First question
- Which legal entity buys electricity, which loads run in the quiet season, and does an existing solar/service agreement cover them?
- Who to ask
- General manager + engineering/facilities + owner/procurement
- What to check
- Hypothesis: daylight cooling or selected back-of-house loads. High/low occupancy and hot-water arrangements affect the case.
- Still unknown
- Direct operator-page retrieval timed out; operator search evidence and association listing support discovery only. Current supply and operations need confirmation.
07HospitalityCoco Ocean Resort & SpaBijilo · Kombo Coastal Road
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator lists accommodation, spa and restaurants. A historical IFC review describes solar water heating, which is different from electricity-producing PV.
- Why investigate
- A technically more involved opportunity: distinguish water-heating systems, existing electrical assets and genuinely unmet electrical demand.
- First question
- Could the facilities team provide today’s equipment inventory and a seasonal load profile for one suitable block?
- Who to ask
- General manager + facilities/engineering + owner/finance
- What to check
- Hypothesis: separately metered cooling, spa/service or kitchen-support loads. Never reuse old generator ratings as a current design basis.
- Still unknown
- The 2008/2016 IFC record is historical. It does not establish today’s PV capacity, generators, demand, contracts or available roof space.
08Beverage manufacturingGAMBEGA / Equatorial Coca-Cola Bottling Company42 Kanifing Industrial Estate
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- ECCBC’s own Gambia page identifies Gambega and the Kanifing facility. GRA recorded a facility visit in June 2024.
- Why investigate
- A later industrial customer with a formal technical/procurement route, not a whole-factory promise within the small-site budget.
- First question
- Would local plant management accept an initial energy-cost discussion and identify any load not already covered by group investment or supply contracts?
- Who to ask
- Plant/engineering manager + procurement + country/group finance
- What to check
- Hypothesis: an independently metered auxiliary daytime load, if worthwhile. Production machinery, motors and continuity require a dedicated engineered case.
- Still unknown
- Current generation, operating schedule, corporate approval rules, site capacity and power costs are unverified.
09Beverage manufacturing · historical site recordBel Bottling GroupBonto Village · Kombo East
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- GRA documented a visit to the group’s Bonto facility on 13 June 2024.
- Why investigate
- A second-wave industrial lead only after the current operating site, management and reachable technical support are verified.
- First question
- Can Lamin confirm the active operator/site and obtain the correct facilities/procurement route before we propose a survey?
- Who to ask
- Current plant management + procurement + finance, to be identified
- What to check
- No capacity or process equipment is assumed. Start with operating verification, then assess a measurable auxiliary/daytime need.
- Still unknown
- The evidence is dated 2024. No present operating status, direct decision-maker contact, energy gap or credit position is established.
10HospitalityBakadaji HotelBertil Harding Highway · Kololi
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator describes 80 suites across 11 blocks, with air conditioning and refrigerators.
- Why investigate
- Compare one guest or service block for metered daytime electricity.
- First question
- Can the owner and engineer share current bills and identify a block not already covered by an energy contract?
- Who to ask
- General manager + engineering/facilities + owner or finance
- What to check
- Measure a defined cooling/service block. Check roof rights, structural condition, existing PV/storage and seasonal use before sizing.
- Still unknown
- Room count is not measured demand. Existing generation, energy contracts, payment capacity and interest are unverified.
11Hospitality · larger siteSenegambia Beach HotelKololi
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator homepage advertises 375 rooms, pools, restaurants and meeting facilities.
- Why investigate
- A large site for one defined service block, not a whole-hotel promise.
- First question
- Which load still has an avoidable energy cost after existing systems, and who can authorise a survey?
- Who to ask
- General manager + chief engineer + owner/finance
- What to check
- Separate cooling/pumping or another daytime block from hot-water demand. Ministry policy records historical solar water heating; that is not proof of today’s PV capacity.
- Still unknown
- The homepage count differs from older category totals. Reconfirm active inventory. Current PV, thermal plant, contracts and load are unknown; direct page retrieval timed out.
12Hospitality · two accommodation areasKombo Beach ResortKotu · Kombo Oasis across the road
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator lists 256 beachfront rooms and 88 additional rooms/apartments at Kombo Oasis, around 100 m away.
- Why investigate
- Investigate one independently metered block; two areas may have different supply boundaries.
- First question
- Are the two accommodation areas separately metered, and is either open to a costed daytime supply proposal?
- Who to ask
- General manager + facilities engineer + owner/procurement
- What to check
- Survey each meter, duty cycle and existing assets. Historical policy mentions solar water heating, not a current PV electricity inventory.
- Still unknown
- Do not combine both areas into one supply design without a survey. Ownership, grid connections, PV, roof rights and procurement interest are unverified.
13HospitalityTUI BLUE TamalaKotu
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator advertises air-conditioned rooms, pools, dining, a gym, spa and conference facilities.
- Why investigate
- Compare a repeat daytime service load, subject to local ownership and brand requirements.
- First question
- Who signs the electricity agreement, and which load is not covered by existing equipment or supplier contracts?
- Who to ask
- Local general manager + engineering + owner/finance
- What to check
- Meter an agreed cooling, pumping or back-of-house load. No verified room count, kW demand or seasonality is assumed.
- Still unknown
- TUI branding does not establish the property owner or electricity buyer. Current solar/storage, approvals and load are unverified.
14HospitalityOcean Bay Hotel & ResortCape Point · Bakau
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- The operator’s suite page lists air conditioning and a minibar; the hotel offers dining and other resort services.
- Why investigate
- A Bakau-area comparison for a defined cooling/service block.
- First question
- Can management identify one measured daytime block and the person who can approve a paid energy offer?
- Who to ask
- General manager + facilities/electrical engineer + owner/finance
- What to check
- Request a circuit-level survey, current plant inventory, seasonal bills and roof/land rights. Do not infer whole-hotel demand from a suite description.
- Still unknown
- Active room count, ownership/management permissions, supply arrangements and purchasing appetite must be verified.
15Food manufacturing · later industrial caseGambia Milling CorporationDobson Street · Banjul
Research prospect · no customer interest or energy gap confirmed.
- Public evidence
- GMC has an operator contact page and appears in Seaboard’s current portfolio. The group’s 2015 profile describes flour/bran production and a port-adjacent grain terminal.
- Why investigate
- A later industrial opportunity after the first commercial site is proven.
- First question
- Would plant management identify an unmet auxiliary/daytime load and the local/group procurement route?
- Who to ask
- Plant engineer + local management + group procurement/finance
- What to check
- Begin with plant power-quality, shift schedule and asset review. Milling motors and production continuity need a dedicated engineered and financed case.
- Still unknown
- The 450 tonnes/day and 8,000-tonne terminal figures are historical 2015 claims, not current audited throughput. Present load, PV, contracts and approval authority are unknown.
Industrial prospects belong to a later dedicated case. Room counts, historical factory capacity and advertised services are not measured electricity loads.
06The later investment case
Make the service work.
Then make the investment work.
The existing $63,000 case assumes an existing roof; it does not fund the new-roof route. Add the complete roof/structure cost and recompute the tariff before offering that option. Platform-development costs also need to be quoted; no standardisation savings are deducted.
Inherited planning model, not quotations or a customer offer. The storage-inclusive case is operating-cash positive, but does not recover its stated ten-year capital target at the assumed $0.28/kWh tariff.
The decision this model points toMeasure the load.
Measure the load.
Compare a smaller-storage design.
Prove the customer benefit and collected tariff before funding equipment. More battery is not automatically a better business.
After operation + reserve, before tax.
1,500 yield · 70% sold · $0.22/kWhAfter operation + reserve, before tax.
1,650 yield · 85% sold · $0.28/kWhAfter operation + reserve, before tax.
1,750 yield · 92% sold · $0.32/kWhIllustrative annual-yield equivalent months, not a seasonal cash forecast. USD, before tax, founder pay/travel and debt service. Sold share combines losses, curtailment and demand matching.
Fund the complete first site.
Deployment$57,000
+Liquidity$6,000
=Planning funding$63,000
Deployment budget, line by line
| Scope | Range | Selected |
|---|---|---|
| PV, mounting + DC works | $7–11k | $9,000 |
| Battery equipment | $14–22k | $18,000 |
| Conversion, controls + protection | $6–10k | $8,000 |
| Installation + existing generator interface | $5–9k | $6,500 |
| Freight, clearance + provisional taxes | $4–8k | $6,000 |
| Engineering, permits + agreement | $2–4k | $3,000 |
| Deployment contingency | $4–8k | $6,500 |
| Deployment | $42–72k | $57,000 |
| Liquidity | $4–10k | $6,000 |
| Combined funding | $46–82k | $63,000 |
Outside scope: a new roof or canopy (including structure, foundations and weatherproofing), land, major roof repairs, new generator, fuel stock, clinical UPS/redundancy, founder pay/travel and a second site. Provisional clearance/tax allowances need product classification and a broker/accountant. No tax exemption is assumed. Recoverable VAT can still create a cash-timing gap.
One operating calculation.
20 kWp × 1,650 kWh/kWp/year × 85% sold ÷ 12
= 2,337.5 delivered solar kWh / month
Covers operation + reserve. Does not recover installation.
Adds ten-year recovery of $57,000 at a 10% hurdle. Liquidity separate.
All model assumptions + stress tests
- Solar
- 20 kWp DC
- Annual solar yield
- 1,650 kWh/kWp; site simulation pending
- Energy sold
- 85%; measured fit pending
- Collected tariff
- $0.28/kWh; willingness to pay unconfirmed
- Variable cost
- $0.015 per delivered kWh
- Fixed costs
- $140/month: $60 support + $40 admin/monitoring + $40 insurance/site
- Replacement reserve
- $110/month; not a battery replacement schedule
- Debt service
- $0; unlevered, not free funding
- Capital target
- 10 years at a 10% annual hurdle
Capital tariff = variable cost + (monthly fixed costs + reserve + capital-recovery charge) ÷ delivered kWh. The annual capital-recovery factor is r ÷ [1 − (1 + r)−n].
Lower the sold share, raise replacement costs and compare smaller storage. Stress a 15% GMD depreciation against USD equipment and delayed customer payment. Indexation is a negotiation and affordability issue, not an assumed right.
Grid purchases and generator fuel are outside this solar-only model. Meter and allocate them separately or add their full costs. No export, subsidy or uncommitted funding receipts are assumed.
07Evidence & boundaries
Facts with context.
Assumptions you can replace.
The original Gambia detail informed this project room. Data is dated, prospects are uncontacted and allowances need quotes. No contract, licence, partner capacity or saving is represented as secured.
Market + operating context
Advertises 141 rooms/suites with air conditioning and mini-fridges. This is not measured occupancy, electricity demand or willingness to buy.
Figure 2.7 places The Gambia among countries with high reported outage incidence. The figure uses 2023/24 Enterprise Survey estimates; it is not a current outage forecast or a survey of our prospects. No exact chart-derived percentage is promoted in the short reading layer.
Published commercial and hotel/industry rates are GMD 14.90 and 15.90/kWh. Use the actual customer bill and check for later decisions before pricing.
Obtain the applicable site-specific generation, supply and grid-connection requirements. Calling electricity a service does not itself remove licensing obligations.
Publishes Gambian commercial projects, including lease references. Existing assets, dates and contract status must be checked; financing alone is not an unoccupied market.
Technical source register
Illustrates inverter/charger, batteries, controller, meters and alternative AC/DC solar coupling. A manufacturer architecture example, not our selected hardware or Gambian approval.
Relates storage and inverter sizing to system duty and expected loads; addresses anti-islanding. Does not size our site or establish local grid-code acceptance.
Includes a 51.2 V / 100 Ah, 5.12 kWh LiFePO4 format and BMS requirements. Eight such nominal units illustrate 40.96 kWh, not usable AC energy, a selected battery bank or a complete offer.
Example of local/remote system monitoring, compatible device integration and offline data storage. Our connectivity, alert escalation, permissions and billing integration still need configuration.
Shows one architecture accepting two AC sources and multi-phase arrangements. Not a selected unit, generator rating, wiring design or clinical continuity guarantee.
Supports rated wiring, fusing and electrical-safety scoping. The site designer must specify actual protection, earthing, cable routes and ratings; no installation instructions are provided here.
Supports structural/electrical assessment, roof condition and safe installation planning. This is a technical checklist reference, not Gambian building/electrical law.
Describes checking supply, storage, metering and generator operation. A qualified team must define and witness site-specific acceptance tests.
Historical technical reference for documentation, maintenance and service scope, not a current Gambian service price or local regulatory approval.
Identifies the electricity regulatory framework and NAWEC’s role. Local counsel, PURA and NAWEC must establish the applicable generation/supply, metering, grid and export route for the proposed site; no threshold or exemption inferred.
Customer source register
Illustrates families of mounting solutions for different roof types. This supports the platform concept, not a selected supplier, a local approval or a new-roof structural design.
Site-specific generation, supply, metering and export requirements must be confirmed. Calling electricity a service does not remove licensing requirements.
£19/day, 14 days £266 ex VAT, approximately $352 at the dated cross-rate. No Gambia delivery, overseas-hire permission or local availability is established.
Replace indicative historical cross-rates with the actual dealing rate when comparing current quotations.
Preserved independently. Legacy fixed-monthly plans, licensing workarounds, assumed savings and unrelated ventures are not adopted by Sunroof.
Architectural concept images include AI-generated illustrations; diagrams and the modular product film are original explanatory work. They do not depict installed Sunroof projects. Team photographs are supplied real images. Fonts: Manrope and DM Mono; licences included locally.
Before ordering equipment
A measured site.
A sound first decision.
Approved design. Agreed customer. Complete funding.
Then install, commission and prove the service.