Imagine this: there’s a power cut, your inverter switches ON, the lights on the display look normal, but still—no output.
No fan, no light, no charging.
Just silence.

It’s one of the most common and frustrating inverter issues people face. The good news?
In most cases, the problem is simple and fixable without calling a technician.

This guide will walk you through why your inverter turns on but gives no output, what you can check at home, and when to seek expert help. The aim is to give you clear, practical, real-life solutions.

1. Loose or Weak Battery Connection – The #1 Reason

Even if the inverter display turns on, it cannot supply power if the battery connection is loose, weak, or corroded.

How to Identify This Issue

• The inverter turns ON, but gives no power to appliances.

• Terminals look rusted or dusty.

• Battery cables feel loose when touched.

What You Should Do

• Tighten the battery terminals using a wrench/spanner.

• Clean corrosion using a cloth or brush.

• Apply petroleum jelly to prevent future rust.

A surprising number of users face this issue just because the terminals aren’t tight enough.

2. Battery Voltage Too Low – Inverter ON, Output OFF

If the battery does not have enough charge, the inverter will turn ON, but it cannot send output power.

This happens when:

• Your battery is very old

• You had long power cuts recently

• Battery is not charging properly

• You used heavy appliances earlier

Signs of Low Battery

• Continuous beeping

• “Low Battery” or red light

• Display showing low percentage

• Output stops suddenly

Solution

• Charge the battery for 2–4 hours.

• Reduce the load (turn off heavy appliances).

• Allow full charging cycle before using.

If the battery is 3–4 years old, get it tested because old batteries lose capacity fast.

3. Output Socket or MCB Fault – A Simple But Ignored Problem

Sometimes the inverter is fine, but the output socket or MCB behind it is the real issue.

Check These Things

• Is your inverter’s output MCB tripped?

• Is the wall socket working?

• Is the wiring burnt or loose?

What You Can Do

• Reset the MCB (just flip the switch back ON).

• Try testing with a small device like a mobile charger.

• Replace any burnt or loose sockets.

A faulty socket is one of the most overlooked reasons.

4. Overload Protection Activated – Inverter Protecting Itself

Inverters are smart.
If you connect more appliances than the inverter capacity, it shuts the output automatically to avoid damage.

Signs of Overload

• Beeping sound

• Overload light blinking

• Inverter shutting down immediately when load is added

Fix

• Turn off heavy appliances like:

  • Iron

  • Heater

  • Washing machine

  • Air cooler

  • Motor pump

• Restart the inverter.

Always remember: an inverter has a fixed VA rating. You must stay within limits.

5. Blown Fuse or Faulty Relay – Inverter On but Output Dead

Many inverters have a fuse or output relay that protects the inverter from excess load or internal faults.

If the fuse blows:

• The inverter will turn ON

• But the output stops completely

How to Check

• Look at the fuse holder (usually at the back).

• If the fuse wire is broken or blackened → it is blown.

Fix

• Replace with the same fuse rating only.

• Never use a higher rating fuse.

If the relay is faulty, a technician must repair it because it needs soldering and PCB knowledge.

6. AC Mains Input Wiring Issue – A Hidden Problem

Sometimes the wiring coming from your main supply to the inverter gets loose or damaged.
This can confuse your inverter and cause it to behave abnormally.

Check:

• Input wire is properly connected

• No burning smell from the wiring

• Earthing is proper

• Switch for mains input is not damaged

Fix:

• Tighten input wires

• Replace damaged wires

• Check mains switch

• Get electrician help if needed

7. Wrong Mode Selected – UPS/Eco/Solar Priority Issue

Most modern inverters have multiple modes such as:

• UPS Mode

• ECO Mode

• Appliance Mode

• Solar Priority / Battery Priority

• Grid Charging Mode

If the wrong mode is selected, your inverter might:

• Stop output

• Give reduced load

• Not switch properly during power cuts

Fix

• Check the inverter mode button

• Reset to default mode

• Refer to the model manual for correct mode settings

8. Damaged or Dead Battery – Inverter Cannot Give Output

If the battery is:

• Bulged

• Leaking

• Very old

• Not holding charge

Then the inverter will turn ON using mains power, but no backup output will come.

Check Battery Health

• Look for bulging or swelling

• Check water level (for lead-acid batteries)

• Test with multimeter

• Ask a technician if needed

A dead battery will need replacement.

9. Internal PCB or Charging Circuit Failure

If everything looks normal from outside but inverter still gives no output, the problem might be internal.

Possible reasons:

• Burnt PCB

• Faulty charging circuit

• Loose internal wiring

• Damaged transformer

Signs

• Burning smell

• Display flickering

• Inverter heats up quickly

• Sudden shutoff even on low load

Fix

This requires a professional technician.
Never open an inverter at home due to the risk of electric shock.

10. Poor Quality Wiring at Home

Sometimes the problem is not the inverter but the house wiring system.

Poor wiring can cause:

• No output

• Fluctuations

• Sudden inverter cutoffs

Ask an electrician to inspect:

• Neutral wiring

• Earthing

• Load connection path

• Inverter bypass wiring

Quick Troubleshooting Table

Problem	Why It Happens	Solution
Loose battery terminals	Dust, corrosion, vibration	Tighten & clean terminals
Low battery	Long power cuts, old battery	Charge battery
MCB tripped	Heavy load, short circuit	Reset MCB
Overload	Too many appliances	Reduce load
Blown fuse	Excess load, surge	Replace fuse
Wrong mode	UPS/ECO confusion	Reset mode
Faulty socket	Burnt wires	Replace socket
Internal fault	PCB damage	Technician required

When Should You Call a Technician?

Call a professional if:

• You smell burning

• Display is flickering

• Inverter is extremely hot

• Battery is swollen or leaking

• No output even after basic checks

• Fuse blows repeatedly

Final Words

If your inverter turns ON but gives no output, don’t panic.
Most issues—like loose battery terminals, low battery, wrong mode, or overload—can be fixed at home in minutes.

Follow the step-by-step checks in this guide and you’ll easily find the root cause.
If the problem continues, it’s best to get a technician so the inverter and battery stay safe.