Solar and inverter maintenance and troubleshooting
A solar system works for years with a little regular care. This guide covers the checks anyone can do safely, how to read common symptoms such as a battery that drains quickly, and when to stop and call a qualified installer.
A simple maintenance routine
| How often | What to check |
|---|---|
| Every week | Look at the inverter display for warnings or fault codes. Note the battery level in the evening. |
| Every month | Look at the panels for dirt, bird droppings, shade from new buildings or growing trees. Listen for fan noise or buzzing from the inverter. |
| Every 3 to 6 months | Have the connections looked at for heat marks or looseness, check the battery room is cool and ventilated, and clean dust from inverter vents. |
| Once a year | Ask a qualified installer for a full inspection: wiring, earthing, surge protection, battery health and settings. |
Cleaning solar panels in dusty weather
Dust and harmattan haze can cut output noticeably, so panels in dry, dusty areas may need cleaning more often than in rainy periods.
- Clean in the early morning or evening, when the panels are cool. Cold water on hot glass can damage it.
- Use clean water and a soft cloth or sponge. Do not use a pressure washer, harsh chemicals or anything abrasive.
- Only clean panels you can reach safely from the ground or a proper access point. Never climb a wet roof or lean over an edge.
- If the panels are on a high roof, pay a person who is trained to work at height.
Panels produce electricity whenever there is light, even if the inverter is off. Do not touch exposed cables or connectors, and do not cut or reconnect anything yourself.
Symptoms and likely causes
| Symptom | Common causes | What you can safely do |
|---|---|---|
| Battery drains much faster than before | An old or worn battery, a heavier load than before, a battery that is never fully recharged, wrong inverter settings. | Compare your current load with what you planned. Turn off big loads. Check the battery level after a full sunny day. If it still falls fast, ask an installer to test the battery. |
| Inverter beeps or shuts down | Overload, a motor start-up surge, low battery voltage, overheating. | Switch off the heaviest loads and restart. Make sure vents are clear. If it repeats, the system is probably undersized for the load. |
| Battery does not charge from the panels | Heavy dust or shade, a tripped breaker, a loose connection, a charge controller fault. | Check for shade and dirt and that breakers are on. Do not open any boxes. Call an installer if nothing changes. |
| Battery does not charge from the grid | Charge current set too low, grid voltage outside the inverter's limits, a tripped input breaker. | Check the display for a grid fault. A wide voltage swing is common, so ask about input range settings. |
| Burning smell, swelling, smoke or heat | Overheated cable or terminal, a failing battery, a short circuit. | Switch off at a safe point, keep people away and call a qualified installer at once. If there is fire or smoke, leave and call the emergency services. |
Looking after the battery
- Keep the room cool, dry and ventilated, and keep the area clear.
- For flooded lead-acid batteries, top up with distilled water only, following the maker's instructions.
- Avoid draining the battery to empty on a regular basis.
- If a new battery is added to an old bank, ask an installer first. Mixed ages and types shorten life.
- Keep a note of the date you installed each battery so you can plan the replacement.
Monitoring helps you catch problems early
Many hybrid inverters have an app or a display that shows solar output, battery level and faults. Looking at it weekly lets you notice a drop in output or a battery that is ageing well before a failure. Note a normal sunny day's output as a baseline, then compare.
Monthly solar checklist
- Read the inverter display and note any warnings.
- Check the battery level at the end of the evening.
- Look at the panels for dirt, droppings and new shade.
- Check the battery area is clean, cool and ventilated.
- Look for burn marks, loose cables or odd smells and call an installer if you see any.
- Note your output on a sunny day and compare it with last month.
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Frequently asked questions
Why is my inverter battery draining so fast?
Common causes are an ageing battery, a load larger than the system was designed for, a battery that never fully recharges, or incorrect settings. Measure your real load and check the battery after a full day of sun, and ask an installer to test it if it keeps happening.
How often should I clean my solar panels?
It depends on dust. In dusty, dry weather, monthly checks and a clean when they look dirty are common. Rain washes off some dirt.
Can I do my own solar maintenance?
You can look, listen and read the display, and clean accessible panels carefully. Leave wiring, battery connections and anything inside the inverter or boxes to a qualified person.
How do I know when to replace the battery?
When it holds noticeably less charge than it did, even after full charging and with the same load, and a test confirms it. Keep notes so you can see the trend.