How to fix an Overload problem in Inverter/UPS
Inverter showing overload? It means the connected load is drawing more power than your inverter/UPS is rated for. The quick fix: switch off a few high-wattage appliances, then reset the inverter from its front button or mobile app. Here’s how to diagnose and fix it properly — and stop it recurring.
An inverter/UPS overload happens when you run more appliances (or a higher-wattage appliance) than the inverter is designed to handle. To protect itself and the battery, the inverter gives an overload warning (buzzer) and then shuts down. This applies across inverter/UPS, solar inverter, solar PCU, online UPS, ESS and ERD systems.
Signs your inverter is overloading
- An overload buzzer/beep sounds, often repeatedly.
- The load cuts out intermittently on battery mode (switches off, tries again, switches off).
- After one or two warnings the inverter shuts down completely and needs a reset.
- The overload/error LED is lit on the display (or flagged in the mobile app).
Smart overload sensing — no need to walk to the inverter
This is where a modern smart inverter like Su-vastika makes a real difference. When the load crosses the limit, it doesn’t just cut out — it first flickers your lights, fans and TV on and off for a short while as a clear overload warning. If you don’t reduce the load, only then does it switch off completely.
Here’s the relief: you don’t have to walk to the inverter to reset it. Just switch off a few loads (use your mobile torch in the dark) — because Su-vastika continuously senses the load, the moment it drops the inverter restarts on its own and runs smoothly again. No front-button reset, no trip to the inverter. Older, basic inverters force a manual reset after every overload; smart load-sensing makes that a thing of the past — a major everyday convenience for the user.
How to fix an inverter overload — step by step
- Reduce the load immediately. Switch off a few heavy appliances (AC, motor/pump, geyser, iron). Often the power returns to normal at once.
- Identify the culprit. Add up the wattage of what’s running (see the table below) and compare it to your inverter’s VA/W rating.
- Reset the inverter. If it has fully shut down, reduce the load first, then press the front reset button (or reset via the mobile app). If you only reduced the load in time, many Su-vastika models recover automatically — no reset needed.
- Stagger high-power devices. Don’t start a motor/AC and other big loads together; surge current can trip overload even within rating.
- Still tripping? Your continuous load may genuinely exceed capacity — size up the inverter, or check for a faulty appliance drawing excess current.
Typical appliance wattage (to find what’s overloading)
| Appliance | Approx. running watts | Notes |
|---|---|---|
| LED lights / fan | 10–75 W | Low load |
| TV / laptop / router | 50–200 W | Low load |
| Refrigerator | 150–400 W | High starting surge |
| Water pump / motor | 750–1500 W | Large startup surge |
| Iron / geyser | 1000–2000 W | Heavy continuous load |
| Air conditioner (1–1.5 ton) | 1200–2000 W | Heavy + surge |
Indicative values; check each appliance’s rating. Add them up and keep total load comfortably below your inverter’s rating. See how to calculate the load chart.
How Su-vastika handles overload
Su-vastika builds microprocessor-based overload protection into every product, with the inverter rated to take overload up to 6× for a short surge — a rugged, unique feature that prevents nuisance trips on motor/AC startup. Each model gives a defined number of overload warnings (listed in the user manual) before shutdown. The Bluetooth/Wi-Fi mobile app (iOS/Play Store) also shows a live overload warning so you can act even when you’re away from the unit.
Frequently asked questions
Related Su-vastika guides
- How to calculate the load chart of an inverter/UPS
- Auto overload & short-circuit restart feature explained
- What is a short circuit in an inverter/UPS?
- MCB on mains / bypass load in inverter UPS
- What to look for when buying an inverter/UPS
Su-vastika in the news: Business Standard — Su-vastika launches up to 500 KVA Lithium Battery UPS.
Disclaimer: This article is written by Kunwer Sachdev, mentor of Su-vastika. Kunwer Sachdev is no longer associated with Su-Kam Power Systems Ltd. in any capacity. Anyone dealing with Su-Kam should be aware that Kunwer Sachdev has no association with the Su-Kam brand or company.