Batteries are the heart of any inverter or solar system — and the part that ages first. Catching the early signs of failure saves you from sudden darkness and protects the rest of your system.
1. Backup time is shrinking
The clearest sign: the system that used to carry you through the night now drops out after an hour or two. If your usage has not changed but your backup has, the battery has lost capacity.
2. Slow or incomplete charging
A healthy battery reaches full charge steadily. If it seems stuck at 70–80%, takes far longer than usual, or the inverter keeps showing "charging" for hours, the cells are likely degrading.
3. Swelling, heat or smell
Physical changes are serious warning signs. A swollen case, excessive heat during charging, or a rotten-egg (sulphur) smell from a tubular battery means the battery should be inspected immediately and possibly disconnected.
4. Age
- Tubular/flooded batteries: typically 2–4 years depending on usage depth and maintenance (top-up water, clean terminals).
- Lithium (LiFePO4) batteries: commonly 5–10 years of service with a battery management system protecting the cells.
If a tubular bank is past year three and showing any symptom above, replacement is usually the economical choice.
5. Inverter warnings and alarms
Constant low-battery alarms (even after a full day of charging), sudden shutdowns under light load, or error codes pointing at battery voltage all point to a battery that can no longer hold its rated energy.
What to do next
Before replacing anything, have the whole system checked: sometimes a faulty charger, loose terminals or corroded connections mimic battery failure. We test battery health, charging behaviour and wiring, then advise honestly — repair if possible, replace if needed.
Thinking about upgrading to lithium? Lithium batteries cost more upfront but last longer, charge faster and give more usable capacity per rated kWh. Ask us on WhatsApp for an assessment or book maintenance and repairs.