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Inverter & Battery Repair: A South African's Guide to Fixing Load Shedding Power
The silence and sudden darkness of load shedding are all too familiar across South Africa. Your inverter and battery system is the shield that keeps your lights on, your Wi-Fi running, and your home secure. But when that system fails, the frustration is immediate.
"We see it all the time. A small issue, like a fan making a noise, gets ignored until the whole inverter overheats during a long outage," says Sipho., a certified electrician and Kandua Pro in Johannesburg. "A quick, affordable repair suddenly becomes a major replacement."
Getting a professional repair is crucial, not just for convenience but for safety. Costs for inverter and battery repairs in South Africa can range from R800 for a simple fuse or fan replacement to over R15,000 for complex component or battery bank replacements. Understanding the warning signs can save you thousands.
Is Your Inverter and Battery System in Trouble?
Recognising the early symptoms of a problem can prevent a complete system breakdown. Ignoring these red flags is a gamble that rarely pays off.
Common warning signs your system needs professional attention include:
- Loud or Unusual Noises: A gentle hum is normal, but any loud buzzing, grinding, or clicking is a clear signal of trouble. It could mean a failing fan, loose wiring, or an overloaded component.
- Error Codes and Warning Lights: Modern inverters use display panels to communicate. An error code like "E01: Overload" or a flashing red light is a direct message that something is wrong. Check your manual, but don't ignore the warning.
- Rapidly Decreasing Backup Time: If your system used to last through four hours of load shedding but now barely makes it through two, your batteries are likely degrading or failing.
- Swollen or Leaking Batteries: This is a critical safety hazard. A swollen battery case, especially on a lead-acid unit, indicates a dangerous internal fault. It requires immediate and professional attention to prevent leaks or even explosions.
- No Power During an Outage: The most obvious sign of failure. If your system doesn't switch over when the power goes out, the fault could be anything from a tripped breaker to a completely failed inverter.
- A Burning Smell or Smoke: This is an emergency. A burning plastic smell indicates severe overheating and is an active fire risk. If it is safe to do so, switch the system off at the main breaker immediately and call a professional.
The Professional Repair Process: What to Expect
When a qualified Kandua Pro arrives, their process is systematic and adheres strictly to South African safety standards. All electrical work on fixed installations must comply with the SANS 10142-1 regulations, also known as the South African National Standard for the wiring of premises.
Here’s what a professional repair typically involves:
- Consultation & Safety Check: The electrician will first ask you about the symptoms you've noticed. They will then perform a safety inspection and shut down the system correctly to prevent any electrical risk.
- Diagnostic Testing: Using multimeters and other diagnostic tools, they will test the input and output voltages, check the health and charge of each battery, and inspect internal components like circuit boards, fans, and capacitors.
- Clear Quoting: Once the fault is identified, you will receive a transparent quote detailing the cost of replacement parts and labour. For a deeper look at what to expect, check out Kandua's Electrician Cost Guide.
- The Repair: This could involve replacing a blown fuse, installing a new cooling fan, repairing a circuit board, or replacing the entire battery bank. Kandua Pros use correct, high-quality parts to ensure a lasting repair.
- System Test: After the repair, the electrician will test the full system under load to confirm everything is working correctly and safely.
The Dangers of DIY: Why a Professional is Non-Negotiable
Attempting to fix an inverter yourself is extremely dangerous. These systems contain capacitors that can hold a lethal electrical charge long after being switched off.
Sipho M. shares a cautionary tale: "A client in Pretoria tried to replace a faulty battery terminal himself. He accidentally shorted the connection, which fried the inverter's main board. What should have been a R1,500 battery job turned into a R9,000 inverter replacement. It's just not worth the risk."
Beyond the immense safety risks, a DIY repair will instantly void your manufacturer’s warranty, leaving you with no recourse if the unit fails completely.
Checklist: Keeping Your System Healthy Post-Repair
After your system is fixed, a little care goes a long way. Use this simple checklist to ensure its longevity:
- Ensure Clear Ventilation: Check that the inverter's cooling vents are free from dust and not obstructed. Good airflow is essential to prevent overheating.
- Monitor Performance: Pay attention to its normal operating sounds. After the next load shedding cycle, check if the backup time meets your expectations.
- Keep the Area Clean: Keep the area around your inverter and batteries clean, dry, and cool.
- Schedule Annual Servicing: Book a professional service once a year. An electrician can run advanced diagnostics, test battery health, and clean internal components, preventing future breakdowns.
Real Customer Stories
Thabo in Pretoria saved R1,200 in potential repairs when his Kandua Pro, called in to fix a charging issue, spotted a faulty stopcock on the nearby plumbing that was causing high humidity around the unit. Thabo admits he would never have noticed the connection on a DIY attempt.
The Naidoo family in Fourways found their system dead after a "pop" during stage 4 load shedding. Their Kandua electrician diagnosed a failed main board from a power surge. He had the part on hand and got them back online in three hours, also installing a surge protector to prevent it from happening again.
Frequently Asked Questions (FAQs)
Q: How much does an inverter repair cost in South Africa?
A: Simple repairs like a fuse or fan replacement can cost between R800 and R2,000. More complex jobs like a main board replacement can range from R4,000 to over R15,000.
Q: How do I know if the problem is my inverter or my batteries?
A: A rapid drop in backup time usually points to the batteries. Error codes, strange noises, or a total failure to power on often indicate an inverter fault. A professional diagnosis is the only way to be certain.
Q: How long do inverter batteries last?
A: Lifespan depends on the type and usage. Standard lead-acid batteries typically last 2-5 years. Modern Lithium-ion (LiFePO4) batteries can last 8-15 years with proper care.
Q: Is it cheaper to repair or replace an old inverter?
A: If the repair cost is more than 60% of the price of a new, comparable unit, it's usually more cost-effective to replace it. A new inverter will come with a full warranty and better efficiency.
Q: Can I run a kettle or geyser off my inverter?
A: No. High-wattage heating appliances like kettles, geysers, stoves, and heaters will overload and damage most home inverter systems. Stick to essential, low-wattage items like lights, TVs, routers, and fridges.
Q: Can I mix old and new batteries?
A: This is strongly discouraged. Old batteries will reduce the performance and shorten the lifespan of the new ones. Always replace all batteries in a bank at the same time.
Written by the Kandua Team, with technical insights from our network of vetted electricians, including Sipho from Johannesburg. All electrical work should be performed by a qualified and registered professional in compliance with the South African Bureau of Standards (SABS) regulations.
Electricians in South Africa: what to know before you book
Electrical issues have a way of starting small… and turning serious fast. A plug that “sometimes trips” can become a melted socket. Flickering lights can point to loose connections. And if your earth leakage keeps going off, it’s often your home telling you something isn’t right.
Kandua helps you get it sorted by matching you with a vetted electrician for your job — whether it’s a repair, installation, inspection, upgrade, or an urgent call-out.
A few quick answers (so you don’t have to scroll)
How do I choose a good electrician?
Pick someone who explains the cause (not just the symptom), tests before they replace parts, prices transparently, and can issue the right compliance paperwork when it’s required.
Do I need an Electrical Certificate of Compliance (CoC) in South Africa?
Often, yes — especially for property transfer and for any additions/alterations to an installation. The Department of Employment and Labour has also warned against “paper CoCs” issued without proper testing, and urges homeowners to use legally registered electrical contractors.
What should electrical work cost?
Most electricians charge a call-out fee + labour + materials, with higher rates for after-hours, complex fault finding, DB work, or urgent callouts. (There’s a pricing guide further down.)
What should I do first in an electrical emergency?
If it’s safe, switch off power at the main breaker, keep people away from the affected area (especially if there’s water), and call an electrician. If there’s smoke/fire risk, treat it as an emergency immediately.
Common electrical problems (and what they usually mean)
You don’t need to diagnose like an electrician — but it helps to know what the usual “signals” point to.
“My plugs keep tripping / the power keeps going off”
Often caused by an overloaded circuit, a faulty appliance, a loose connection, or a problem at the DB (distribution board). If it’s frequent, don’t just keep resetting — you want proper testing to prevent heat build-up and damage.
“My earth leakage trips randomly (especially at night or when it rains)”
This can indicate moisture ingress, a faulty appliance, deteriorating insulation, outdoor circuits taking on water, or an earthing/bonding issue. It’s common — and it’s exactly the sort of thing that needs systematic fault finding.
“My lights flicker / dim when I use appliances”
Sometimes it’s a supply issue — but it can also point to loose connections, voltage drop, an overloaded circuit, or a stressed neutral. If you’re noticing it across multiple rooms, get it checked.
“I smell burning / a plug is warm / there’s buzzing at the DB”
Treat this as urgent. Heat + electrics is how small problems become big ones. Switch off the circuit (or main breaker if you’re unsure) and book an electrician.
“I get a small shock/tingle from taps or appliances”
That can be an earthing/bonding fault and should be investigated quickly — especially in kitchens, bathrooms, and anywhere near water.
When it’s a DIY job — and when it isn’t
DIY can be fine for low-risk, non-electrical basics (like replacing a light bulb, resetting a tripped breaker once, or unplugging an appliance to test if it’s the cause).
Call an electrician when:
- a socket/switch is hot, crackling, discoloured, or smells burnt
- breakers/earth leakage keep tripping
- you suspect faulty wiring, water exposure, or a hidden issue
- you’re touching the DB, adding circuits, or upgrading capacity
- you’re installing high-load appliances (oven, hob, geyser, heat pump) or adding dedicated circuits
- you’re adding solar/inverter equipment or changing the installation layout
- you may need a CoC for compliance, insurance, or sale/transfer
Certifications, registrations & compliance in South Africa (what matters and when)
This is the part people usually discover too late. Here’s the simple version.
1) Electrical CoC (Certificate of Compliance)
A CoC is a legal document confirming an electrical installation has been inspected and tested and is compliant. It’s commonly required before property sale/transfer, and it’s also required when electrical work involves additions or alterations.
Also important: the Department of Employment and Labour explicitly warns that a registered contractor may only issue a CoC after proper inspection/testing, and may not issue on behalf of an unregistered person.
2) “Registered person” (who is actually allowed to certify)
In practice, certification is tied to being a properly registered/authorised person (often referred to as a wireman’s licence / registered person in the industry). If you need a CoC, ask upfront:
“Are you legally registered to inspect, test, and issue the CoC for this work?”
3) CoC validity (the part everyone argues about)
A useful way to think about it:
- For transfer purposes, the regulations are commonly applied as “not older than 2 years”.
- For day-to-day living, it remains relevant until changes are made — if you alter/add to the installation, you’ll typically need a supplementary CoC for that work.
4) Solar / inverter / PV additions (very common now)
If you’re adding solar PV or inverter equipment, treat it as a compliance-sensitive electrical project. Industry guidance stresses that PV work should be under the supervision of properly qualified electrical persons, and the City of Cape Town’s guidance notes you should request the original electrical CoC from the registered installation electrician.
Pricing: what to budget for an electrician in South Africa
Pricing varies by city, travel distance, urgency, and complexity — but most homeowners will see a familiar structure:
Typical cost structure
- Call-out fee (travel + initial assessment)
- Labour (hourly)
- Materials/parts
- After-hours premium (nights, weekends, public holidays)
- Specialist testing / fault finding time (often where the real value is)
Typical ranges you’ll see (guideline)
- Labour: roughly R350 – R700/hour for many standard jobs (average often around the mid-range), with higher rates for specialised work.
- Emergency call-out: often around R600 – R900 (and may or may not include the first hour — always ask).
A realistic “small job” expectation
Even when it sounds simple, budget for a call-out + 1–2 hours labour plus parts. If you have a few small fixes, bundling them into one visit often saves money.
10 Genuinely helpful electrician FAQ's
- What’s the difference between “the power tripped” and “earth leakage tripped”?
A normal breaker trip usually points to overload or a circuit fault. Earth leakage trips when it detects current leaking to earth (often moisture, insulation breakdown, or a faulty appliance). If earth leakage trips repeatedly, it needs proper fault finding. - How do I figure out if it’s my appliance or the house wiring?
A safe starting point is to unplug high-load appliances and see if the trip stops — but if trips continue (or you see heat/burning smells), stop testing and get an electrician. The correct method is measured testing, not guesswork. - Why does my plug socket feel warm?
Warmth can mean a loose connection, overload, poor contact, or damaged wiring — all of which can create heat and become dangerous. Book it in sooner rather than later. - My lights flicker when I use the kettle/microwave — is that normal?
Occasional minor dimming can happen, but persistent flickering/dimming can signal voltage drop, loose connections, overloaded circuits, or neutral issues. If it’s happening across rooms, get it checked. - Do I need a dedicated circuit for an oven/hob/geyser/heat pump?
Very often, yes — these are high-load items and are safer (and usually more reliable) with correct isolation and wiring sized for the load. An electrician should assess and advise based on your DB capacity. - What’s involved in a DB (distribution board) upgrade?
Typically: inspection of existing circuits, correcting unsafe/incorrect connections, adding/replacing breakers, ensuring earthing and bonding are correct, labelling circuits, and testing. DB work should be done carefully and properly documented. - Do I need a new CoC after renovations?
If the renovation involved electrical additions/alterations (new circuits, moved points, new DB work, solar/inverter additions), you’ll usually need a supplementary CoC for that work. - How long does a CoC take to issue?
It depends on how many defects are found. A proper CoC requires inspection and testing — if repairs are needed, it may take longer. Be wary of instant “paper CoCs” with no testing. - Does an electrical CoC cover everything in the house?
A CoC generally relates to the electrical installation and its safety/compliance (distribution, wiring, earthing, bonding, etc.). If you have specialised systems (like solar PV or an electric fence), ask what additional documentation is required for those. - What should I ask an electrician before they start?
Three questions cover most issues:
- “What do you think is the likely cause, and how will you test it?”
- “Is this priced as call-out + hourly + materials, and what counts as after-hours?”
- “Will this work require a CoC or supplementary CoC — and are you registered to issue it?”
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