Commercial Off-Grid Solar Cape Town covers standalone solar systems that power a business load with no connection to the utility grid - remote farm buildings, borehole and irrigation pumps, telecom and security sites, construction camps and properties where a grid connection is unavailable or too expensive. Compare quotes from installers who design off-grid systems.
Off-grid is the most demanding configuration to design. There is no grid to fall back on, so the system has to carry the worst week of winter, not an average day.
Describe the site, the loads, and how many hours a day they run.
Get Up To 5 Commercial Solar QuotesWhen Off-Grid Makes Sense
- No grid supply nearby. Extending an Eskom line across a farm can cost more than a standalone system.
- Remote pumping. Borehole, irrigation and livestock water pumps often run directly from solar with a pump drive, no battery needed.
- Temporary or mobile sites. Construction sites, events and mining exploration camps.
- Security and monitoring. Cameras, gate motors, electric fencing and communication masts on large properties.
- Replacing diesel. Sites currently run entirely on a generator.
For a business already connected to the grid, disconnecting completely is rarely worth it. A hybrid system gives backup while keeping the grid as a reserve.
How An Off-Grid System Works
Panels charge a battery bank through an off-grid or hybrid inverter-charger. The inverter forms its own AC supply for the loads. When batteries run low and solar cannot keep up, a generator starts automatically to carry loads and recharge the bank.
Components
| Component | Off-grid consideration |
|---|---|
| PV array | Oversized for Cape Town winter yields |
| Battery bank | Sized for days of autonomy, not hours |
| Off-grid inverter-chargers | Must handle full load plus motor starts |
| Generator | Automatic start for extended cloudy periods |
| Solar pump drives | Run pumps directly from PV without batteries |
| Monitoring | Remote alerts, since nobody is on site |
Designing For Winter
Cape Town's winter rainfall season brings shorter days and runs of overcast weather. Solar production in June can be roughly half of December's. Off-grid designs account for this with:
- A larger PV array than a grid-tied system for the same load.
- Battery autonomy of one to three days for critical loads.
- Generator backup sized to carry loads and recharge batteries together.
- Load management - non-essential loads switched off automatically when batteries are low.
Sizing Example
A remote packing shed running 8 kW for 8 hours uses about 64 kWh a day. With one day of autonomy and usable depth of discharge, it needs roughly 80 kWh of storage. The array must replace that energy on a winter day, which at around 2.5 to 3 kWh per kWp per day means 22 kWp or more, plus a generator for longer bad spells.
Commercial Off-Grid Solar Cape Town Prices
| System | Installed range, excl. VAT |
|---|---|
| Solar borehole pump, 2 - 5 kW, no battery | R60,000 - R160,000 |
| Security / telecom site, 3 kWp + 10 kWh | R90,000 - R170,000 |
| Small off-grid building, 10 kWp + 30 kWh | R300,000 - R480,000 |
| Farm shed or workshop, 25 kWp + 80 kWh | R750,000 - R1,200,000 |
| 60 kW / 100 kWh standalone with generator integration | R900,000 - R1,600,000 |
| Automatic generator start and changeover | R25,000 - R120,000 |
Excludes the generator itself and long cable runs, trenching or structures.
Off-grid sizing mistakes are expensive. Compare several designs for the same loads.
Compare Commercial Solar InstallersOff-Grid Versus A Grid Connection
| Factor | Off-grid | Grid connection |
|---|---|---|
| Upfront cost | High | Depends on distance and capacity |
| Monthly cost | Maintenance and fuel | Tariffs and fixed charges |
| Outages | None from the grid; generator for long bad spells | Subject to grid faults |
| Capacity growth | Needs more PV and batteries | Apply for more capacity |
| Registration | Exempt if there is no point of grid connection | SSEG authorisation |
Compliance
NERSA has confirmed that embedded generation facilities with no point of connection to the grid are exempt from registration. The electrical installation still needs a Certificate of Compliance from a registered person. If an off-grid system could ever be connected to a supply - even through a changeover switch - it is treated differently, so confirm with your distributor before installation.
Maintenance
Remote systems need remote monitoring, periodic battery and inverter checks, panel cleaning in dusty agricultural areas, and generator servicing. See Commercial Solar Maintenance Cape Town and, for farming applications, Solar for Farms Cape Town. The standard installation process is outlined on Commercial Solar Installation Cape Town.
Frequently Asked Questions
Can a business run completely off-grid on solar?
Yes, with enough panels, batteries and usually a generator for extended cloudy periods. For grid-connected businesses, a hybrid system is normally more cost-effective.
Do off-grid solar systems need registration?
NERSA exempts facilities with no point of connection to the grid from registration. An electrical Certificate of Compliance is still needed. Confirm with your distributor if any grid connection exists.
How many days of battery backup does off-grid need?
Commonly one to three days for critical loads, with a generator covering longer periods of poor weather.
Can a borehole pump run on solar without batteries?
Yes. Solar pump drives run pumps directly from panels during the day, often storing water in tanks instead of energy in batteries.
Why do off-grid systems need more panels?
They must recharge batteries and run loads on short, cloudy winter days, when production can be around half of summer output.
Is off-grid cheaper than extending an Eskom line?
On remote farm sites it can be. Get a connection quote from the distributor and compare it with off-grid proposals over 10 to 15 years.
Can I use my existing generator with off-grid solar?
Usually, if it is suitably sized and fitted with automatic start and compatible controls.
Related Commercial Solar Pages
Commercial Solar Installation Cape Town is a free quote-comparison service. The solar work is carried out by the independent installers that quote you, and your contract is with the installer you appoint. Ask each installer for company details, references, insurance cover and their compliance paperwork before appointing anyone.
Commercial Off-Grid Solar Cape Town. Compare off-grid designs from vetted commercial solar installers.
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