Thermo Group: Solar Experts You Can Trust
Solar installations for homes, estates and businesses in Milnerton: quality workmanship and clear written quotes.
At Thermo Group, we provide professional solar installation throughout Milnerton and the surrounding Cape Town areas, helping homeowners and businesses take control of their energy costs and improve their energy independence.
Thinking about solar in Cape Town?
Free solar quotes, no obligation. Installation and City registration handled for you. Qualified from 2007.
Free solar quote · homes and businesses · no obligation
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No prices on screen and no pushy sales. We call you back the same day, do a free site assessment, then send an accurate written quote.
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Where is the property?
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What do you need, and how much power do you use?
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Roughly what is your monthly electricity bill?
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Prefer to talk? Call 021 203 5337 or WhatsApp 082 302 0683
We handle the complete solar installation process, from assessing your property and designing the right system, through to installation, testing, compliance and registration.
Whether you are looking for a solar PV system, battery backup, a hybrid inverter or a complete energy solution, we design a system around your property’s electricity usage and requirements.
Complete Solar Solutions
Our solar services include:
- Solar panel installations
- Battery storage systems
- Hybrid and backup inverter systems
- Residential solar installations
- Commercial solar installations
- Solar system upgrades and expansions
- Electrical compliance and certification
- SSEG applications and registration
- Solar system registration with the City of Cape Town
- Solar system inspections and fault finding
- Ongoing solar maintenance and servicing
We Don't Just Install, We Maintain
Our relationship with clients does not end when the solar installation is complete.
We offer ongoing maintenance and servicing for solar systems, to help keep equipment operating safely and efficiently. We can assist with inspections, fault finding, inverter issues, battery systems, electrical connections and general system maintenance.
Regular maintenance can also help identify potential problems before they become expensive failures.
As solar contractors serving Milnerton, our qualified installers provide solar panel and PV system maintenance, so your investment keeps performing at its best.
SSEG & City of Cape Town Registration
Installing a solar system is only part of the process. Where required, your system must also be properly documented and registered with the City of Cape Town.
Thermo Group handles SSEG registration for the solar systems it installs, and makes sure the required documentation, electrical compliance requirements and system information are correctly dealt with. Our goal is to make the process as straightforward as possible for the property owner.
Your Cape Town Solar Experts
From the initial consultation to installation, compliance, registration and ongoing maintenance, Thermo Group provides a complete solar solution under one roof.
Driven by Quality. Powered by Trust.
More Solar Services
Explore our full range of solar installation and solutions services across Cape Town, or find out more about our solar maintenance plans.
Solar in Milnerton: Between the Lagoon and the Sea
Milnerton is a seaside suburb on Table Bay, with the Diep River lagoon on one side and the open Atlantic on the other. Its streets hold older freestanding houses on generous plots, townhouse clusters, apartment blocks, newer estates and a good deal of business space. Because the building stock is so mixed, there is no single “Milnerton solar system”. The right design depends on the roof you have, who controls it, and what you need the system to do when the grid drops out.
Three questions shape almost every Milnerton quote. Who may approve work on the roof: you, a homeowners’ association or a body corporate? How exposed is the roof to wind and salt? And do you want a lower daytime bill, backup during load-shedding, or both?
A sound quote begins with your electricity bills and a site visit, not a catalogue. Our main solar installations page explains the process in general terms, and the sections below cover what is particular to Milnerton.
Roofs and Ownership: Houses, Estates, Complexes and Sectional Title
Milnerton’s housing runs from small older apartments through townhouses and clusters to large freehold homes, and from established streets to newer golf-estate and beachfront developments. This table sets out what usually needs settling first.
| Property type | Who decides | Settle first |
|---|---|---|
| Older freehold house | The owner | Roof condition and fixings, an ageing distribution board, earthing, shade from mature trees |
| Newer house in an estate | Owner, subject to the estate rules | Design guidelines on panel position and visibility, written HOA approval, enclosure for the inverter |
| Townhouse or cluster | Trustees or the HOA | Whether the roof is common property, exclusive-use rights, cable route to your board |
| Apartment in a block | Body corporate | A roof rule or resolution, battery location, insurance and maintenance responsibility |
| Shop, office or warehouse | Owner or landlord | Lease terms, roof age and access, size of the electricity supply |
Older freehold homes
Many established Milnerton houses have corrugated iron, IBR or concrete-tile roofs, and each is straightforward to mount on when the structure underneath is sound. An old covering is better replaced before the panels go up than after. These homes may also have a distribution board from an earlier era, and it can be worth upgrading it at the same time so the solar and battery circuits are protected properly. Our distribution board upgrades page explains what that involves.
Estates and complexes
Residential estates and complexes are a feature of the area, from golf-course estates to lagoon-side developments and complexes such as Royal Ascot and Burgundy Estate. In these, the roof or the street view may not be yours to alter on your own. Ask the managing agent for the written design rules, submit your equipment list and mounting layout to the trustees or HOA, and keep their approval on file. The City application assumes you have the right to install, so approval comes first.
Flats and sectional title
In a block, the roof normally belongs to the scheme. Solar usually needs the trustees’ consent and sometimes a formal rule that gives one owner exclusive use of a roof section. Agree in advance who insures the equipment, who pays if the roof needs repair around the panels, and where a battery may stand. Applications for flats and group developments are assessed individually by the City.
Neighbouring areas have their own pages: see solar installations in Royal Ascot and solar installations in Sunset Beach.
Coastal Wind and Salt Air Near Milnerton Beach and the Lagoon
Anything within sight of the water works harder than the same equipment inland. Salt in the air attacks fasteners, frames, connectors, cable glands and the inside of enclosures. In coastal homes, electrical specialists commonly recommend a regular inspection of the installation for exactly this reason, and a solar system is no exception.
What to specify
- Corrosion-resistant fixings and rails. Ask what the clamps, bolts and brackets are made of, not just what the panels are.
- Outdoor-rated equipment. Inverters, isolators and distribution boards should carry a suitable ingress-protection rating, and be mounted out of direct spray and rain where possible.
- Sealed, dry enclosures. Moisture and salt inside a board cause corrosion and nuisance tripping. Sealed glands and good cable entry details matter.
- Properly torqued, evenly spaced mounting. Cape Town’s south-easter is the main wind load, and the structure under the rails must be sound at every fixing.
Wind and roof shape
Panels behave like sails. On a pitched roof, flush mounting generally catches less wind than tilted frames. On a flat roof, tilt frames need ballast or fixings that go through the waterproofing, and every penetration has to be sealed. A roof close to the shore sees more wind than a sheltered street further back, so the engineering should fit the specific roof.
Shade and orientation
In the southern hemisphere, north-facing panels generally give the best annual yield, while east- and west-facing sections spread production across the day. Trees, neighbouring buildings and roof equipment can shade part of an array, and shade on one panel can drag down a whole string. A good designer checks shading across the year, including the lower winter sun.
Salt also leaves a film on glass. A gentle rinse with clean water, plus an annual inspection of fixings and connectors, keeps performance steady. Our solar maintenance service covers what a check should include.
Hybrid Systems, Batteries and Load-Shedding for Milnerton Homes
A grid-tied system without a battery is switched off automatically when the grid fails. That is a safety feature, but it also means the house is dark during an outage. A hybrid system adds a battery and a protected circuit, so the loads you choose keep running. Both types are treated as grid-tied for registration purposes, and both need City authorisation if your supply is with the City of Cape Town.
Choosing what the battery protects
- Write down the essentials. Lights, fridge, freezer, router, phone and laptop chargers, a television, a gate or garage motor and a security system cover most households.
- Leave the heavy loads off. A geyser, stove, tumble dryer, pool pump or air-conditioner on the backed-up circuit would need a far larger inverter and battery, and rarely makes sense.
- Allow for the worst week. A battery that starts an evening outage half empty after a cloudy winter day will not carry you through it. Size for the poor days, not the good ones.
- Check motor starting. Fridge compressors and pumps draw a surge as they start, and the inverter has to cope with it.
Where batteries go
The City advises that batteries sit in a properly racked, dry and ventilated space. A freestanding house may have a garage or utility room away from direct sun and escape routes. In a flat or small townhouse, space is tighter and the body corporate or insurer may set conditions, so raise it early.
The board may need splitting so essentials sit on their own circuit, which is a good moment to have the existing wiring inspected. Our electricians in Milnerton handle that side of the work, and for a system that has begun to misbehave, see solar repairs and fault finding.
City of Cape Town Registration, Certificates and Insurance in Milnerton
Milnerton once had its own municipality, but today it falls under the City of Cape Town. If your electricity account is with the City, a solar or battery system that connects to your wiring must be authorised before installation and again before it is switched on. The City’s term for this is small-scale embedded generation (SSEG). Since 1 October 2023, every new solar and battery system is treated as grid-tied for this purpose. Registration itself is free; a fee applies only when an owner fails to register.
The order of events
- The application goes in through the City’s online portal, using an inverter from the City’s approved list.
- Permission to Install comes back from the City. Panels may be mounted, but nothing is energised.
- Once the work is finished, the Certificate of Compliance, a commissioning report and a signed supplemental contract go to the City, with an ECSA-registered professional signing off the report.
- Only when the City’s commissioning letter arrives may the system be switched on for good.
Thermo Group handles this registration for the systems it installs. In a complex or sectional title block, the owner or body corporate remains the applicant and can authorise the installer to act for them.
Certificate, authorisation and insurer
A Certificate of Compliance and City authorisation are different documents, and a grid-connected system needs both. The certificate shows that the installation was inspected and tested. The authorisation is what permits it to connect. Read more about the certificate on our solar certificate of compliance page.
Tell your insurer once the system is in, and ask what is covered for theft, lightning and fire. Insurers commonly ask for a valid certificate after a claim, so keep the certificate, invoices and commissioning papers together. If you sell, a new owner has to sign a fresh supplemental contract, or the system must be authorised or decommissioned, so give your conveyancer the file early. Where the City’s supply does not apply to your property, ask your supplier for its current requirement before any work starts.
Commercial and Industrial Solar Around Montague Gardens and Marconi Beam
Milnerton has a large commercial side. Industrial areas such as Montague Gardens contain business parks with warehousing, distribution, light manufacturing and automotive tenants, and the area also has office parks and retail centres. Businesses like these tend to use most of their electricity while the sun is up, which suits solar. The questions are how much of that daytime load a system can cover and how the bill responds.
What a business should ask
- Who owns the roof? Tenants in a business park usually need the landlord’s written consent, and a lease may limit alterations. Landlord and tenant should agree who pays for the system, who owns it and who benefits.
- What does the load look like? A flat weekday daytime load is ideal. Shift work, weekend trading and refrigeration change the design.
- How is the tariff built? Many City business tariffs combine energy charges, time-of-use periods and a peak-demand charge. Solar reduces daytime energy purchases, but a cloudy spell can coincide with your peak, so it cannot promise a lower demand charge.
- What is the roof like? Older industrial roofs may be asbestos-cement, which needs specialist advice before anyone drills or walks on it.
- Export or zero export? Exporting needs an advanced meter at the owner’s cost, while a zero-export design uses reverse-power-flow protection.
Business owners have been able to claim a tax deduction on qualifying solar under section 12B of the Income Tax Act, but the conditions have changed and ownership structure matters, so confirm today’s position with your accountant. Supplies above 100 A are assessed on a different technical footing, so give your supply size at the outset. For the neighbouring industrial areas, see solar installations in Montague Gardens and solar installations in Paarden Eiland. Developers working on several buildings should read about solar for property developers.
Choosing a Milnerton Solar Installer: Quote Checklist, Credentials and Upkeep
Comparing quotes is easier with a checklist. A sound Milnerton quote should show:
- Make, model and quantity of panels, inverter and batteries, with the battery’s usable capacity.
- Array size in kWp, inverter size in kW and storage in kWh.
- A statement that the inverter appears on the City’s approved list.
- How roof strength and wind load were assessed, and what the fixings are made of.
- What stays powered in an outage, and any work to your distribution board.
- Who handles City registration and the Certificate of Compliance.
- Exclusions, payment terms and who to call if something fails.
Red flags
Be wary of a quote with no site visit, equipment described only as “equivalent”, registration called optional, an “off-grid” label used to dodge City approval, or pressure to pay in full today.
Credentials worth checking
Thermo Group is an ECA member, belongs to SAPVIA and holds PV GreenCard. SAPVIA is an industry body rather than a regulator, and PV GreenCard is a voluntary quality and training scheme for PV installers, which issues an as-built report when a job is complete. It does not replace the electrical certificate, which only a registered electrician can sign. The City also suggests asking any installer for references to earlier City-authorised installations.
Upkeep
Plan on a yearly inspection of fixings, connectors, isolators, earthing, inverter ventilation and battery condition, and an extra check after a severe storm. Rinse salt and dust from the glass in the cool of the morning or evening, using clean water and a soft brush, never a pressure washer.
When you are ready, ask for a free, no-obligation quote with no call-out fee on 021 203 5337 or 082 302 0683, or use our quote request form. We also cover the wider Cape Town area, listed on our areas we service page.
Solar Installers Milnerton: More Questions Answered
Usually only with the body corporate’s agreement. The roof is normally common property, so trustees decide, sometimes by a formal rule that gives you exclusive use of a roof section. Submit your equipment list and mounting plan in writing, deal with insurance and roof-repair responsibility, and get the decision on paper before work starts.
Salt speeds up corrosion on fixings, frames, connectors and enclosures, and leaves a film on the glass. Ask for corrosion-resistant fasteners and outdoor-rated equipment kept out of direct spray. Rinse the panels with clean water now and then, and have the whole system inspected once a year.
Many allow them, but most have design rules covering where panels may go, how visible they are and how equipment is enclosed. Ask the managing agent for the written guidelines, submit your layout for approval and keep the response on file. Do this before the City application, since the City process assumes you have the right to install.
Often yes. A business usually has a larger daytime load, a different tariff structure and a lease to consider. The design starts from a year of consumption data, your trading hours and your supply size. Tenants need the landlord’s written consent before anything is fixed to the roof.
If your electricity account is with the City, yes. All new solar and battery systems count as grid-tied, so the City must give Permission to Install first and a commissioning letter before switch-on. Registration is free, and Thermo Group handles it for the systems it installs.
Keep to the essentials: lights, fridge and freezer, router, chargers, a television, the gate motor and security. Leave the geyser, stove, pool pump and air-conditioning off the backed-up circuit. That keeps the battery a manageable size and makes outage cover realistic.
Once a year is a sensible baseline, with an extra look after a severe storm. A check covers clamps and fixings, connectors, cabling, isolators, earthing, inverter ventilation and battery condition. Rinse the glass with clean water when salt or dust builds up, ideally early or late in the day.
Keep the Certificate of Compliance, City authorisation, commissioning papers and invoices together and hand them to your conveyancer early. According to the City’s requirements, a new owner signs a new supplemental contract, and an unauthorised system must be authorised or decommissioned. Missing paperwork can slow the sale.
Book Your Milnerton Solar Consultation
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How much does solar installation cost in Milnerton?
It depends on your usage, roof and system size. A small backup system for essentials costs far less than one covering a whole property. We assess your usage and roof before quoting, so you get a written quote based on your property rather than a generic estimate.
How long does a solar installation take in Milnerton?
That depends on the size of the system, the roof and the time needed for approvals. We give you a clear timeline once we have assessed your property.
I live in an older Milnerton home or a complex. Does that affect the installation?
It can. Older homes sometimes need a distribution board upgrade alongside the solar installation, and complexes or estates may need trustee or HOA approval before work starts. We can quote for the electrical work in the same visit and explain which approvals apply.
Will solar keep my home running during load-shedding?
A hybrid system with a battery can keep chosen essential circuits running during an outage, while a grid-tied system without a battery shuts down when the grid fails. We handle the City of Cape Town SSEG registration for the systems we install.
Do you also handle compliance certificates and ongoing maintenance for the system?
Yes. Thermo Compliance, a division of Thermo Group, issues the electrical Certificate of Compliance your installation needs, and we offer maintenance and fault finding to keep it performing well, whether we installed it or another company did.
Solar Installations & Maintenance in Milnerton
Qualified solar technicians serving Milnerton and the surrounding Cape Town area: installation, compliance, registration and ongoing maintenance.
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- Certificate of Compliance Milnerton
- Electrician Milnerton
- Emergency Electrician Milnerton
- Solar Maintenance & Repairs Milnerton
See all Solar Installation areas in Cape Town or everything we offer on our areas we service page.
