I have Luminous Eco Volt+ and also currently having a very similar problem. My electricity goes out sometimes the inverter works for a few seconds before showing overload even on 100-150W load and shuts off. If it works fine for a little while and electricity is back then it fails to switch and charge the battery and instead gives long continuous beep non-stop and shows overload and mains + charging led keeps blinking.
I have to remove power and then replug it to fix the situation but it happens again if power goes out and comes back.
I have validated all the connections and even bought a new battery a couple days ago (it was due anyways since it's been over 5 years for the previous one). Still he problem remained.
Now today I checked the inverter live wire line and when I unplugged it from the back of the inverter, to my surprise, the electricity of all the appliances which are connected to inverter never went off.
I checked the plug and it was live, without being plugged in anywhere...
So this means I'm having a short/connection of mains live to inverter live line somewhere before the inverter connection. Also this must mean I was feeding live into the back socket of the inverter and I checked the plug of the inverter (which goes into main), all 3 pins (earth, neutral and live) were live! Disastrous. IDK how inverter still kinda works.
I think my home wiring is somehow messed up in the past few days because this wasn't happening before. I need to get it checked by a professional.
Meanwhile I'm testing the inverter separately on some appliance to see if it works as normal after this supposed torture.
