Commercial & Industrial Inverters
Choosing the right inverter is one of the most important decisions in any commercial or industrial solar panel and battery storage installation — it’s the component that determines whether your business actually stays powered during load shedding, and whether your system can handle real industrial loads rather than household-sized guesswork. BFO Solar has specified and installed inverters across 859+ systems since 2011 for South African commercial and industrial sites — factories, cold storage, farms and more. Below are the questions we’re asked most, followed by what matters specifically when sizing an inverter for commercial and industrial use.
What is an inverter?
An inverter is an electronic device that changes direct current (DC) into alternating current (AC), allowing you to use AC-powered devices and appliances.
Why would I need an inverter?
You would need an inverter if you want to power AC devices or appliances when you are away from a traditional power source, such as during camping trips, on boats, or during power outages.
Can an inverter run off a vehicle or fleet battery?
Yes, many inverters are specifically designed to be used with cars and other vehicles. They typically connect to the vehicle’s battery and provide AC power for charging laptops, phones, or running small appliances.
How do I choose the right size of an inverter?
To choose the right size of an inverter, calculate the total watts of the appliances you plan to run simultaneously and add a margin for safety. It’s recommended to select an inverter that can handle at least 20% more wattage than your calculated value.
Sizing an inverter for commercial and industrial loads
Household sizing rules don’t hold up on a factory floor or in a cold room. Commercial and industrial sites typically run three-phase equipment, have high inrush current on startup (motors, compressors, cold room chillers), and need enough headroom to run critical loads simultaneously — not just the biggest single appliance. Before we size an inverter for a commercial installation, we look at:
- Total connected load across all critical equipment, not just peak demand
- Single-phase vs three-phase requirements for motors, compressors and industrial machinery
- Startup surge current for equipment with electric motors (often 3–6× running current)
- How many hours of backup you need per load-shedding stage
- Room to add battery capacity or a second inverter as the business grows
Undersizing is the most common and most expensive mistake we see — an inverter that trips under startup load, or that can’t carry the site through a full load-shedding stage, isn’t saving anyone money. Every BFO Solar commercial install is sized against your actual load profile, not a generic calculator.
Can I use an inverter to power sensitive electronics?
Absolutely! There are inverters available with built-in features like pure sine wave output, which provides clean and stable power similar to grid electricity. This makes them safe for powering sensitive electronics like laptops, televisions, and medical equipment.
Are all inverters portable?
No, not all inverters are portable. Some models are designed for permanent installation, such as those used for solar power systems or backup generators. However, there are plenty of compact and lightweight portable inverters available that you can easily carry around.
Hybrid inverters and load shedding in South Africa
Most of BFO Solar’s commercial and industrial installations use a hybrid inverter — one unit that manages solar generation, battery storage and Eskom grid power together, switching to battery automatically when the grid drops. That seamless changeover is what keeps a cold room, server rack or production line running through a load-shedding stage without a hard reboot. It’s also what makes the R1.20/kWh locked electricity rate BFO offers possible: the inverter is configured so your site draws from cheaper stored solar power first, before falling back to the R2.50+/kWh grid rate.
Can I connect multiple batteries to increase the capacity of my inverter system?
Yes, it is possible to connect multiple batteries together to increase the capacity of your inverter system. This allows for longer backup power duration or higher power output depending on your requirements.
What safety protections should a business look for in an inverter?
Look for overload protection, short circuit protection, over-temperature shutdown, and low battery voltage shutdown — on a commercial site, add surge protection and a COC-compliant installation as standard. These measures ensure the safety of your equipment and prevent damage to the inverter itself.
Commercial Inverter FAQs
Do I need a hybrid inverter for a commercial solar and battery system?
For most commercial and industrial sites, yes. A hybrid inverter lets you run solar, battery storage and the Eskom grid off one system, switching to stored power automatically when load shedding hits. A grid-tied-only inverter without battery integration won’t keep your site running during an outage — it simply shuts down with the grid.
What size inverter does a commercial or industrial site need?
It depends on your connected load, not your floor size. A cold storage facility running several compressors needs a different inverter configuration to an office park or a dairy farm’s milking parlour. BFO Solar sizes every commercial inverter against your site’s actual load profile and startup surge requirements — see our commercial solar installations page for examples by industry.
Will my inverter keep my business running during load shedding?
Yes, provided it’s a hybrid inverter with sufficient battery capacity behind it, sized for your full critical load and not just the essentials. We size backup duration against the load-shedding stages that actually affect your area, so a Stage 4 outage doesn’t catch your business short.
Do I need a three-phase inverter for industrial equipment?
If your site runs three-phase motors, compressors or production machinery, yes — a single-phase inverter can’t power that equipment correctly. Most factories, cold storage sites and larger commercial premises need a three-phase inverter configuration; smaller offices or retail sites are often fine on single-phase.
Does BFO Solar’s inverter installation include COC compliance?
Yes. Every BFO Solar installation — inverter, battery and panel wiring — is signed off with a Certificate of Compliance (COC) as standard, not an optional extra. This matters for insurance, for resale, and for passing any electrical inspection your municipality or insurer requires.
How long does a commercial-grade inverter last?
A well-specified commercial inverter typically lasts 10–15 years with normal use — often less than the 25-year lifespan of the solar panels it’s paired with, which is why we build inverter replacement into the long-term cost picture upfront rather than treating it as a surprise later. Manufacturer warranties on the inverters we install typically run 5–10 years depending on the model.