Buying a Home with Solar and Backup Water: What to Check Before You Make an Offer

A house with solar panels, batteries and water storage can offer valuable everyday convenience. It may reduce electricity purchases, keep essential appliances running during an outage and provide water when the municipal supply is interrupted. For buyers, these features can make one property appear considerably more attractive than another.

But the equipment visible at a viewing tells only part of the story. Who owns it? What does it actually supply? Has the installation received the necessary approvals? How much maintenance will it require, and will it suit the household moving in?

When buying a house with solar panels in South Africa, the strongest approach is to assess ownership, compliance, performance and ongoing cost separately. Apply the same discipline to backup water. This guide explains the evidence to request, the assumptions to question and the issues to resolve before committing to a purchase.

Start with the services your household actually needs

Define what you want the systems to do before judging their size or price. Keeping a home office, fridge and lights running is a different requirement from powering electric cooking, air conditioning and a geyser. Similarly, supplying toilets during a water interruption is different from supplying drinking water throughout the house.

Ask for a written description of which circuits and taps are served. A listing that says “solar” could describe electricity generation, a battery backup installation or solar water heating. These are different systems with different benefits.

Consider the property’s specific setting. Roof shading, available tank space, the electricity distributor and the condition of local infrastructure all matter. Ask about the seller’s actual experience of service interruptions, then check available municipal notices. An estate’s communal backup arrangements also need separate investigation: they may serve access gates and common areas without supplying individual homes.

Does the seller own the equipment being offered?

Do not assume that equipment attached to the house is fully paid for or available to transfer without conditions. Ask whether the solar installation is owned outright, financed, rented or supplied under a service agreement.

Request the purchase invoices and any finance or rental contract. If a third party has contractual rights over the equipment, have the conveyancer establish what must happen before transfer. Depending on the agreement, this could involve settlement, consent to transfer a contract or an alternative arrangement with the provider.

Any proposed takeover needs its own assessment. Obtain the remaining term, monthly charges, escalation provisions, maintenance responsibilities and cancellation conditions. A property price that appears attractive can look different once continuing equipment payments are included.

The sale agreement should identify the included panels, inverter, batteries, tanks, pumps and treatment equipment. Record makes, models and serial numbers where available, together with exclusions. Avoid relying on a broad promise that “everything stays”.

Which solar documents should buyers request?

Separate electrical safety from supplier approval

An electrical Certificate of Compliance, commonly called a CoC, and the electricity supplier’s embedded generation approval serve different purposes. Eskom expressly distinguishes electrical safety certification from registration relating to connection to its network. One should not be treated as a substitute for the other.

Under the Electrical Installation Regulations, a change of ownership generally requires a CoC no older than two years, subject to the legislation’s qualifications. Additions or alterations also require certification covering at least that work. Ask a registered electrical professional to confirm that the documents cover the installation as it exists, including subsequent solar or battery additions.

Establish whether Eskom or a municipality supplies the property. Request the registration or authorisation documents applicable to that supplier and system configuration. A submitted application is not the same as completed approval. Ask the supplier what changes of ownership, account details or installation particulars require.

Cape Town, for example, operates its own authorisation process for embedded generation. Buyers should verify the requirements for the actual address rather than apply another municipality’s rules. A claim that a system exports no electricity, or is “off-grid”, should be checked against its technical configuration and the supplier’s requirements.

Check physical condition as well as paperwork

Commission an independent assessment by an appropriately qualified solar electrical professional. Ask for findings on safety, equipment condition, system configuration and suitability for your intended loads. A CoC is not a prediction of remaining battery life or future savings.

Roof condition deserves attention too. Where necessary, obtain a building or roofing assessment of mounting points, leaks and the supporting structure. Panels can complicate roof repairs, so establish whether removal and reinstatement would be needed for foreseeable maintenance.

Will the solar and battery system meet your needs?

Understand power, storage and backup capability

Kilowatts, or kW, describe power: the rate at which equipment supplies or consumes electricity. Kilowatt-hours, or kWh, describe energy stored or used over time. An inverter’s power rating and a battery’s storage capacity answer different questions.

As a simplified illustration, 4 kWh available to supply a steady 1 kW load represents about four hours of energy before allowing for conversion losses and operating constraints. Actual runtime depends on battery condition, starting charge, reserve settings and changing appliance demand. A rating printed on the battery is not a runtime guarantee.

Solar panels also do not automatically keep a house powered during an outage. Many grid-connected systems shut down when the grid fails. Backup operation requires equipment and wiring configured for that purpose. Even a battery-equipped system may support only selected circuits.

Have the installer demonstrate normal and backup operation safely. Identify whether the water pump, security equipment, garage door and essential sockets remain powered. On a property with three-phase electricity, establish which phases and loads receive backup. Ask whether solar can recharge the battery during an outage.

Assess battery condition and warranty terms

Request installation dates, service records, fault history and available monitoring data. Ask the assessor to review battery health information and explain its limitations. A battery showing a full charge is not necessarily retaining its original storage capacity.

Read the actual warranties. Cover may depend on time, cycles, energy throughput, operating conditions or other terms. Confirm whether the remaining cover transfers to the buyer, what documents are required and who handles local claims. Obtain a current estimate for foreseeable replacement or upgrading before negotiating the price.

How should you assess savings and property value?

Request up to 12 months of electricity bills and monitoring records where available. Compare imported electricity, solar production and household consumption across seasons. Generation is not identical to savings: electricity must be used, stored for later use or exported under an applicable arrangement to provide a financial benefit.

The seller’s bills also reflect the seller’s lifestyle. A household occupied during daylight hours may use solar differently from one whose main demand occurs after sunset. Check the tariff applicable to your account, including fixed charges and any time-based pricing. Do not assume export payments are available without the necessary agreement and metering.

When comparing homes for sale in South Africa, look beyond the presence of a solar or water-backup feature. Compare documented condition, useful capacity, ownership and likely running costs alongside location, accommodation and the overall condition of the property.

There is no sound basis for automatically adding the original installation cost to a home’s value. Obtain local comparable sales and current replacement quotations. A system may improve a property’s appeal without recovering every rand spent on it, particularly if components need replacing or the buyer needs a different configuration.

What kind of backup water does the property have?

Municipal storage, rainwater and boreholes are different

• A municipal backup tank stores water supplied by the municipality. It can bridge an interruption while stored water lasts, but it does not create an independent source.
• A rainwater system collects rainfall, usually from a roof. Its usefulness depends on rainfall timing, collection area, storage capacity and demand. Ask how it performs during the local dry season rather than judging it when the tank is full.
• A borehole accesses groundwater. Request the drilling record, available pumping-test results, pump details and water-quality reports. Have a groundwater specialist assess whether the evidence supports the proposed use. A short demonstration of flowing water does not establish sustainable supply through a dry period.

Check capacity, pressure and electricity dependence

Ask which outlets receive stored water and whether supply changes over automatically or manually. Check pressure while more than one outlet is used. Include any garden cottage or additional household in the assessment.

For illustration, 2,000 litres of usable stored water would last four days at an assumed total demand of 500 litres a day, without replenishment. That is arithmetic, not a recommended allowance or a promise of duration. Measure likely demand and allow for reserves, leaks and inaccessible water.

If supply relies on an electric pump, establish whether it can operate during a power failure. The electrical assessor should check the pump’s starting demand against the backup system’s capability. Water in a tank is of limited practical use if it cannot reach the taps when needed.

Is the water safe, and is its use authorised?

Clear water is not proof of drinking-water quality. Ask an accredited laboratory to advise on appropriate microbiological and chemical testing against the applicable South African drinking-water standard, SANS 241. Sampling should reflect the source, treatment and point of use.

Establish what the treatment equipment actually does and which contaminants it addresses. A filter alone is not evidence that water is safe to drink. Request maintenance instructions, replacement intervals and testing records. One satisfactory sample describes conditions at a particular time; it does not guarantee continuing quality.

National water-use rules and municipal installation requirements must also be distinguished. Schedule 1 of the National Water Act permits certain uses, including reasonable domestic use from a water resource to which the person has lawful access. This is not an unrestricted entitlement for every scale or purpose of groundwater abstraction. Confirm whether the property’s actual use requires further authorisation.

Municipal requirements can apply separately. Cape Town, for example, requires approval for alternative water systems and supporting documentation for installations connected inside buildings. Local permission should never be inferred solely from a seller’s statement that domestic borehole use is allowed nationally.

Have a qualified plumber check the layout and required protection against contamination of the municipal supply. Obtain confirmation of which outlets carry non-drinking water and how they are identified. Neither a plumbing certificate nor equipment approval should be treated as a laboratory guarantee of drinking-water quality.

Budget for maintenance, insurance and shared responsibilities

Prepare an annual ownership budget covering inspections, servicing, treatment consumables, laboratory testing and any monitoring subscriptions. Add provision for eventual battery, inverter and pump replacement. Use quotations for the installed equipment rather than a generic maintenance percentage.

Ask your insurer or broker to confirm cover for the actual installation, the appropriate insured values, required documents and relevant exclusions or excesses. Establish responsibility for insurance where equipment is rented. The seller’s existing policy does not establish your future cover.

For sectional title or estate property, request the relevant approvals and rules. Establish whether equipment occupies common property, who owns communal systems and how maintenance and replacement costs are funded. Ask about outstanding repairs or planned expenditure that could affect levies. Obtain written confirmation of the service supplied to the individual unit.

Resolve uncertainties before signing the offer

Request the seller’s property disclosure form, then follow up specifically on leaks, electrical faults, battery failures, water contamination and equipment disputes. Disclosure should inform the investigation, alongside specialist inspections and supporting records.

If essential checks cannot be completed before signing, ask the conveyancer to draft appropriate conditions. These should define the inspections, deadlines, required documents and consequences of unsatisfactory findings. A general promise to “sort out the solar” leaves too much unresolved.

Before committing, make sure the written arrangements address:

1. The equipment included, ownership position and any third-party consent or settlement.
2. Required certification and approvals, outstanding work and responsibility for costs.
3. Agreed inspections and the contractual process if defects are identified.
4. Handover of warranties, manuals, monitoring access and operating instructions.

Sellers can reduce uncertainty by preparing this information before marketing. Accurate descriptions, service records and documented approvals give buyers a firmer basis for assessing the asking price. Arrange a final operational handover close to occupation, with agreed work checked and access accounts transferred securely.

Resolve uncertainties before signing the offer. Accurate information and documented approvals give buyers a firmer basis for assessing the asking price. — Dan Taylor, Principal at Investpro.

Frequently asked questions

Does solar automatically increase a home’s value?

No fixed premium applies to every property. Condition, ownership, performance and local buyer demand influence its contribution. Assess comparable properties and foreseeable costs rather than assuming the installation price will be recovered.

Is an electrical CoC enough when buying a house with solar?

No. Check certification alongside the electricity supplier’s applicable registration or authorisation requirements. Also obtain an assessment of equipment condition and performance, which the CoC does not guarantee.

Can rented solar equipment stay after the property is sold?

Possibly, depending on the provider’s contract and any required consent. Establish the arrangement before signing and record who pays, who owns the equipment and who maintains it.

Can you drink borehole or rainwater?

Only use it for drinking once appropriate testing, treatment and applicable approvals establish its suitability. Appearance and taste are insufficient, and ongoing maintenance and monitoring remain necessary.

Will backup water work during a power outage?

It depends on the design. A pumped system needs a suitable power supply; other arrangements may use gravity. Have the system demonstrated and confirm pressure, usable storage and pump compatibility with backup power.

Buy the documented benefit.

Solar and backup water deserve careful attention because they affect how a home functions every day. Their value becomes clearer when ownership is settled, approvals are documented, performance is demonstrated and future costs are understood.

A well-informed purchase connects those facts to the household’s needs and the local property market. That allows buyers to negotiate with confidence and sellers to substantiate the benefits they are offering, without depending on broad claims of savings or independence.