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Solar panels are the most visible part of any commercial or industrial solar system, but the panel itself is only as good as the inverter and battery storage behind it. BFO Solar has installed 859+ systems since 2011 for South African businesses — factories, cold storage, farms, retail and more — and this guide covers what every commercial buyer actually needs to know, from how panels work through to sizing, payback and maintenance for a business site.

In This Guide

What are solar panels?


Solar panels are devices made up of photovoltaic cells that convert sunlight into electricity.

How do solar panels work?


Solar panels work by capturing photons from sunlight and using them to create an electric current. When the sunlight hits the solar cells, it generates an electrical charge which is then converted into usable electricity.

What are the benefits of switching to solar?


Installing solar panels has numerous benefits, including lower electricity bills, reduced carbon footprint, and potential financial incentives or tax credits.

How long do solar panels last?


On average, solar panels can last for 25 to 30 years. However, some manufacturers offer warranties for up to 25 years on the performance of their panels.

Panel efficiency, degradation and payback for commercial installations

Commercial-grade panels degrade slowly — typically under 0.5% output loss per year — so a panel still delivers roughly 85-90% of its original output near the end of its 25-year warranty. For South African businesses, the number that actually matters is payback: BFO Solar’s commercial and industrial installations typically pay back in 3–5 years against Eskom’s rising tariff (up 500%+ since 2008), after which the system is generating electricity at a locked rate of R1.20/kWh for the remaining life of the panels — against Eskom’s current ~R2.50/kWh and climbing.

Can I install solar panels myself?


While it’s possible to install solar panels yourself, it is highly recommended to hire a professional installer who has experience in handling electrical connections and ensuring proper installation.

How much space do I need for solar panel installation?


The amount of space needed for solar panel installation depends on various factors such as your energy requirements and the efficiency of the chosen panels. On average, you would need around 100 square feet per kilowatt (kW) of installed capacity.

Commercial solar panel sizing for South African businesses

Commercial and industrial sites don’t size off a rough per-kW rule — roof area, orientation, shading and your actual load profile all shift the number. A factory or cold storage facility with a large flat roof and high daytime consumption can often host a system sized to offset most of its daytime grid draw; an office park with a smaller roof and split load across common areas needs a different approach entirely. Factors that affect commercial solar panel output:

  • Roof orientation and pitch (north-facing performs best in South Africa)
  • Shading from nearby structures, trees or plant equipment
  • Panel efficiency rating and local solar irradiance for your region
  • Soiling — dust and grime build-up common on industrial and agricultural roofs, and your cleaning cadence
  • How closely your daytime consumption pattern matches solar generation hours

BFO Solar surveys the actual roof and load profile for every commercial quote — see examples across specific industries we’ve installed for, from cold storage to schools to shopping malls.

What maintenance does a solar installation need?


Solar panels require minimal maintenance as they have no moving parts but regular cleaning and inspection are recommended to ensure optimal performance. Cleaning can be done with water and a soft brush or sponge.

Can I use solar energy during power outages?


Yes, if you have a battery storage system connected to your solar panel installation, you can utilise stored energy during power outages. This allows you to have a source of electricity even when the grid is down.

Solar Panel FAQs

How many solar panels does a commercial or industrial site need?

It depends on your energy consumption, roof space and how much of your daytime grid draw you want to offset. A mid-size factory or cold storage facility typically needs a far larger array than the 100 sq ft/kW residential rule of thumb suggests once three-phase equipment and extended operating hours are factored in. BFO Solar sizes every commercial system against your actual usage data, not a generic estimate.

What’s the real payback period for commercial solar panels in South Africa?

Typically 3–5 years for BFO Solar’s commercial and industrial installations, driven by Eskom’s tariff increases (500%+ since 2008) against a locked rate of R1.20/kWh once your system is live. Businesses with high daytime consumption — cold storage, manufacturing, food processing — tend to see the fastest payback because their usage matches solar generation hours closely.

Do solar panels still generate power on cloudy days or during load shedding?

Yes, panels still generate power on overcast days, just at reduced output — and load shedding doesn’t stop solar generation itself, but a grid-tied-only system will still shut down for safety when the grid drops unless it’s paired with battery storage and a hybrid inverter that can island the site from the grid.

What warranty do BFO Solar’s panels carry?

Our panels carry a 25-year warranty, consistent with the panel lifespan discussed above. Combined with a properly sized inverter and battery bank, this is engineered as a long-term asset for your business, not a short-term cost-cutting measure.

Can a factory or cold storage roof handle the structural load of solar panels?

In most cases yes, but it needs checking before installation — industrial roofs vary widely in sheeting type, purlin spacing and age. BFO Solar assesses roof structure as part of every commercial site survey, and will flag any reinforcement needed before quoting, rather than after installation has started.

Does BFO Solar handle COC compliance for panel installations?

Yes. Every BFO Solar panel installation is signed off with a Certificate of Compliance (COC) as standard, alongside the inverter and battery wiring — required for insurance, resale, and any municipal or insurer electrical inspection.