Short answer: build four evidence files
Before treating solar or battery storage as a property benefit, build four separate files: property authority and programme pathway; technical design, approvals, and equipment; bills, production, costs, and warranties; and insurance, storm, service, and transfer evidence. The files should agree on the owner, address, system size, operating mode, equipment, dates, approvals, and obligations. A seller's savings estimate, installer proposal, monitoring screenshot, roof photo, or CUC credit is only one piece of the record.
- Classify the system before discussing returns: grid-export CORE, grid-export DER, non-export self-consumption, or genuinely off-grid are not interchangeable pathways.
- Use current official programme, tariff, capacity, code, inspection, and policy evidence at the decision date; do not rely on an old installer deck or a previous programme tranche.
- Make the property's attorney, insurer, lender, qualified electrical and solar professionals, CUC, and the relevant public authority answer the questions within their own roles.
- Do not waive the offer condition until the buyer can identify what transfers, what must be corrected, who pays, and what happens if approval or performance is not evidenced.
Classify the operating pathway before comparing systems
OfReg's June 2026 self-consumption statement separates non-export systems into Off-Grid, Track 1 air-gap, and Track 2 parallel non-export pathways. It also distinguishes those pathways from CORE and DER, which are export-and-credit arrangements. CUC's current CORE and DER pages separately describe their programme applications and live capacity process. Ask the responsible installer and transaction team to identify the actual pathway in writing and tie it to the equipment and approvals on site.
| Pathway | Evidence question | Do not assume |
|---|---|---|
| CORE | Is there a complete, current agreement and approved system record for this owner, property, meter, size, and equipment? | A panel installation or historic credit proves the agreement is current, transferable, or unchanged. |
| DER | Do the agreement, approved allocation, demand and billing treatment, equipment, and operating record match the property file? | DER economics or charges behave like CORE or standard residential billing. |
| Parallel non-export | Does the design, certified equipment, zero-export control, disconnect, inspection, notification, and Permission to Operate evidence match OfReg's current pathway? | Calling a system “zero export” proves the required configuration or authorisation. |
| Air-gap or off-grid | What equipment creates the separation, what loads are served, and what notification, electrical-safety, and Building Code evidence applies? | No export means no documentation, safety, notification, or maintenance duties. |
Reconcile the CUC application and operating file
CUC's live programme pages instruct applicants to check remaining capacity before applying, explain that a signed Part 1 reserves capacity only through the stated process, and place technical information in Part 2 after Building Control Unit approval of the single-line diagram. They also say the customer is responsible for monitoring and maintaining the system and keeping it configured to the agreement. Treat those pages as live evidence and archive the exact version used for the decision.
| CUC evidence | Match it to | Exception to resolve |
|---|---|---|
| Application and agreement | Owner or authorised signatory, property, meter, pathway, capacity, system size, dates, signatures, fee, and terms. | Draft, unsigned, expired, different owner, different meter, unexplained extension, or missing schedule. |
| Capacity and approval trail | Part 1 status, allocation evidence, Part 2, BCU-approved drawing, final review, activation, and any later change. | Proposal or payment presented as a completed reservation, approval, or Permission to Operate. |
| Meter and billing | Account class, meter identifiers, bills before and after activation, credits or demand treatment, and current tariff source. | Savings shown without the underlying bills, dates, tariff components, or account history. |
| System changes | Added panels, replacement inverter or battery, firmware or export setting, rewiring, roof work, and amended approvals. | Installed equipment or operating mode differs from the approved file. |
Require the technical and approval evidence
A commissioned system should have more than a sales proposal. OfReg's current non-export guide says listed equipment, applicable Building Code and electrical standards, a visible lockable disconnect, notification, and pathway-specific requirements matter; parallel non-export systems also require the T&D Connection Code and Permission to Operate before energising. CORE and DER use their own current application and validation route. Ask the responsible professionals which requirements apply to the exact installed pathway.
- Collect the approved single-line diagram, equipment schedule, panel layout, structural and roof details, cable and isolation route, battery location and ventilation or protection details, labels, commissioning results, inspection records, permissions, and final as-built changes.
- Match panel, inverter, battery, transfer switch, power-control system, reverse-power relay, disconnect, meter, monitoring gateway, and protective-device make, model, rating, serial number, firmware, and location where applicable.
- Ask who designed, installed, inspected, commissioned, certified, and may service the system, and verify current credentials or authorisation rather than relying on the logo on an old invoice.
- Require written treatment for roof loading, wind attachment, waterproofing, corrosion, cable penetrations, fire and access separation, drainage, flood exposure, and emergency isolation.
- Do not energise, test, open, reset, reconfigure, or bypass electrical or battery equipment as buyer DIY due diligence.
Inspect condition, serviceability, and remaining life
The array, roof, inverter, battery, control system, monitoring equipment, and electrical protection age differently. Ask qualified specialists to inspect the equipment and installation within a written scope, then separate observed condition from remaining-life estimates and warranty promises. A functioning monitoring app on one sunny day is not a condition report.
| Asset | Evidence to review | Decision question |
|---|---|---|
| Roof and array | Roof age and warranty, attachment and flashing, corrosion, panel condition, shading, cleaning and service history, and post-storm inspections. | Can roof work proceed without avoidable removal, reinstallation, approval, or warranty cost? |
| Inverter and controls | Serials, commissioning and fault logs, firmware, export setting, protection, ventilation, replacement history, and support status. | Is the approved operating mode intact and can compatible service or replacement be obtained? |
| Battery | Chemistry, usable capacity, cycles or health data, temperature and fault history, enclosure, recall or service notices, warranty, and end-of-life route. | What performance is evidenced, what degradation is accepted, and who handles safe replacement or disposal? |
| Monitoring and communications | Owner access, installer access, account transfer, gateway and connectivity, data history, licences or subscriptions, and privacy controls. | Will the buyer receive usable history and full administrative control at closing? |
Rebuild the energy and bill baseline from dated records
Model the property from source records, not advertised savings. Obtain at least twelve consecutive months of electricity bills where available, interval or monitoring data, system production and import/export history, occupancy and vacancy dates, major load changes, outages, faults, curtailment, and maintenance. Then apply the current tariff and programme terms to the buyer's expected usage and the verified pathway.
- Record every billing component and credit separately; do not compare only the bottom-line bill before and after installation.
- Normalize for air-conditioning, pool equipment, electric vehicles, occupancy, renovations, tenant behavior, seasonal weather, equipment downtime, and any change in meter or tariff class.
- Reconcile monitoring production with bills and meter evidence, then investigate missing months, resets, data gaps, unexplained export, or a claimed battery benefit that is not visible in the record.
- Run conservative cases for equipment degradation, downtime, battery replacement, inverter failure, roof work, insurance changes, tariff or credit changes, programme terms, and lower-than-proposed production.
- Do not publish or accept a guaranteed payback, resale premium, bill reduction, or storm-runtime promise without transaction-specific evidence and documented assumptions.
Audit contracts, warranties, service, and handover
A warranty has value only if the buyer can identify the obligor, covered asset, term, exclusions, claim process, territory, transfer rule, required maintenance, approved service route, and evidence that the seller complied. Keep product, workmanship, roof, waterproofing, performance, monitoring, and battery warranties separate; they may have different issuers and transfer steps.
- Collect signed proposals, invoices, proof of payment, finance or lease documents, warranties, registrations, commissioning and service records, claims, repairs, replacements, recalls, and open disputes.
- Ask each warranty provider in writing what transfers, whether notice or a fee is required, which documents and deadlines apply, and whether the Cayman address remains supported.
- Identify the local service path, remote support, spare-part and compatible replacement route, expected lead times, call-out terms, and who can access manufacturer or installer portals.
- List every key, code, password, app, gateway, administrative account, monitoring licence, subscription, manual, shutdown procedure, and emergency contact to be handed over securely.
- Do not treat a manufacturer's headline term as proof that labour, shipping, access, removal, reinstallation, corrosion, storm, water, roof leaks, degradation, or consequential loss is covered.
Put insurance and storm recovery in the same file
HMCI directs residents to prepare for hurricane hazards, while CUC maintains disaster-readiness guidance for the power system. The buyer needs the property's own evidence: how the array and battery are insured, isolated, protected, inspected after wind or water exposure, and returned to service. A battery is not automatically whole-home backup, and panels do not make a damaged electrical system safe.
| Resilience question | Evidence to obtain | Unsafe shortcut |
|---|---|---|
| Insurance | Policy schedule, declared value, array and battery treatment, exclusions, deductibles, roof or water terms, business or rental use, and claim process. | Assuming attached equipment is fully covered because the building is insured. |
| Backup scope | Critical-load schedule, usable battery capacity, inverter limits, transfer behavior, start and shutdown procedure, tested runtime, and recharge assumptions. | Calling a battery “whole-home backup” without a tested load and operating plan. |
| Storm preparation | Owner and professional checklist, isolation point, monitoring plan, access restriction, loose-item and drainage controls, contacts, and pre-storm photos. | Climbing onto the roof or changing live electrical settings as a storm approaches. |
| Return to service | Post-event visual record, qualified roof and electrical assessment, water-exposure treatment, manufacturer guidance, required inspection or permission, and insurer notice. | Re-energising after flooding, impact, fire, saltwater exposure, damaged wiring, or an unexplained fault. |
Model the buyer's decision, not the seller's headline
A buyer's model should begin on the expected closing date and use the actual purchase price allocation, verified equipment and pathway, current official rates and terms, buyer usage, remaining warranties, service access, insurance, roof horizon, and likely replacements. Keep energy savings, resilience value, environmental preference, and resale assumptions visible as separate inputs rather than hiding them inside one optimistic payback number.
- Create base, downside, and interruption cases with dated inputs and a named evidence source for each material assumption.
- Include inspection, legal and programme review, account or agreement transfer, monitoring transfer, corrective work, roof coordination, annual service, insurance, subscriptions, inverter or battery replacement, and safe end-of-life handling.
- Show what happens if programme capacity, export credit, tariff design, buyer consumption, production, equipment support, warranty coverage, or insurance terms change.
- Do not double-count both lower electricity purchases and an export credit for the same energy, or treat tax, finance, currency, inflation, or opportunity cost as immaterial by default.
- Use the model as a negotiation and condition tool, not as a valuation certificate, engineering report, lender approval, insurer commitment, or guaranteed investment return.
Use a written closing and commissioning gate
Before the buyer accepts the system, releases a property condition, funds remedial work, or authorises a new installation, issue one exception sheet. Mark each item closed by evidence, accepted with a quantified owner and cost, extended to a dated condition, or unresolved. A system operating today is not the same as a complete and transferable property asset.
| Release question | Evidence to require | If unresolved |
|---|---|---|
| Right pathway and authority? | Attorney-reviewed ownership and property authority plus the documented CORE, DER, non-export, or off-grid pathway. | Keep the legal, title, strata, lease, or programme condition open. |
| Approved and safe configuration? | As-built design, equipment match, inspections, permission or programme status, commissioning, and qualified condition review. | Require correction and reinspection, extend, price, retain, redesign, or exit with professional advice. |
| Economics evidenced? | Dated bills and production, current terms, buyer assumptions, maintenance and replacement cases, and open-fault treatment. | Exclude unsupported value, renegotiate, or obtain specialist analysis. |
| Transfer complete? | Agreement and account steps, warranties, finance release, monitoring administration, keys and records, insurer and lender acceptance, and final meter or system handover. | Make completion, retention, post-closing undertaking, or cancellation consequences explicit through the attorney. |
Trust note
Last updated August 2026. This guide is written for relocation planning and should be verified with licensed Cayman professionals for legal, tax, immigration, medical, insurance, or financial decisions.
Reference points: Cayman Islands Government — National Energy Policy, Cayman Islands Government Energy Unit — What We Do, CUC — Customer Owned Renewable Energy (CORE) Programme, CUC — Distributed Energy Resources (DER) Programme, CUC — Renewable Energy, CUC — Disaster Preparedness, OfReg — Renewable Energy, OfReg — Consumer Self-Consumption Solar and Battery Guide (June 2026), OfReg — Cayman Islands Value of Solar Study, Hazard Management Cayman Islands — Hurricanes.