Top 5 Mistakes South Africans Make When Buying Backup Power (And How to Avoid Them)
Load shedding panic-buying leads to expensive regrets. Here’s what to watch out for.
Every time a new round of load shedding hits, thousands of South Africans rush out to buy backup power solutions — and many end up with systems that are underpowered, incompatible, or simply bad value for money.
We’ve seen it all. Here are the five most common mistakes, and exactly how to avoid them.
Mistake #1: Buying an Inverter Without Considering the Battery
This is by far the most common error. People buy an inverter based on the price, then realise they need to separately buy a battery — and the total cost is far more than expected. Or worse, they buy a battery that’s incompatible with the inverter.
What to do instead: Always plan your inverter and battery together as a system. Check:
- What battery voltage does the inverter require? (12V, 24V, or 48V)
- What battery types does it support? (Lithium, AGM, flooded lead-acid)
- Does it have a built-in MPPT charge controller if you want to add solar later?
Buying a mismatched setup can damage both the battery and the inverter — an expensive mistake.
Mistake #2: Underestimating Power Needs
“I just want to keep the lights and TV on.” This sounds like a small load, but people forget to add the fridge, the Wi-Fi router, phone chargers, a fan, and the decoder. Suddenly a 500VA inverter is completely overwhelmed.
What to do instead: Add up the wattage of every appliance you want to run simultaneously. Multiply by 1.25 for safety margin — that’s the minimum inverter VA rating you need. (Read our full guide on calculating system size here.)
Also remember: some appliances have a startup surge 2–3x higher than their running wattage (especially fridges and pumps). Your inverter needs to handle that peak too.
Mistake #3: Choosing Lead-Acid to Save Money, Then Replacing It in 2 Years
A 200Ah AGM battery for R4,000 looks like a bargain compared to a lithium battery at R12,000. But if that lead-acid battery lasts 2 years with regular daily cycling (which is common in a load-shedding environment), you’ve paid R4,000 twice — R8,000 total — and you’re still dealing with a heavy, slower-charging battery.
What to do instead: Run the numbers over 10 years before deciding. In most load-shedding use cases, lithium works out cheaper in the long run, while being lighter, faster-charging, and maintenance-free. If budget is genuinely tight, AGM is fine as a starting point — just plan to upgrade.
Mistake #4: Not Considering the Charge Time
This one catches people off guard. You come home to a depleted battery after a long load-shedding day. With a lead-acid battery, it can take 8–12 hours to fully recharge from mains power. If load shedding hits again that same evening, you’re not protected.
Lithium batteries charge 2–3x faster, meaning your system is ready again much sooner.
What to do instead: Check the maximum charge current your inverter supports and compare it to your battery’s specs. For frequent load shedding, faster recharge time is a practical necessity, not a luxury. Also ensure your inverter’s charger is sized appropriately — a small built-in charger on a large battery bank is a bottleneck.
Mistake #5: Buying the Cheapest No-Name Inverter Online
Budget inverters from unknown brands flood the South African market, often through Facebook Marketplace and small online stores. Many of these are:
- Modified sine wave (damaging to sensitive electronics)
- Misrated (a “2000W” unit that can barely handle 1000W)
- Without proper surge protection
- Sold with no local warranty or support
What to do instead: Stick to established brands with local support — Victron, Axpert/Voltronic, Mecer, Deye, Sunsynk, and SolarEdge all have solid track records in South Africa. Yes, they cost more upfront. But when something goes wrong (and with cheap units, it usually does), you won’t be left with a brick and no recourse.
Bonus Tip: Don’t Forget Installation Costs
If you’re having a system professionally installed, budget for:
- Electrician labour (typically R2,000–R8,000 depending on system complexity)
- Cabling, breakers, and mounting hardware (R1,000–R3,000)
- Certificate of Compliance (CoC) — required for insurance and resale purposes
DIY is possible for experienced people, but the final grid connection must be done by a registered electrician.
Buy Smart at SunProfit
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Not sure if your setup is right? Send us the specs of what you’re considering — we’ll tell you honestly if it works.
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