Powertech inverter MI 5106 beeps all the time

Michael
Are you using the clips and leads it was supplied with?
If yes. are they direct to the battery terminals, or other position connected to the battery?

Often the supplied leads are not good conductors of electricity due to small cable copper and sus crimped lugs. Although it works the input voltage to the circuitry may be marginal even though it is using a good battery.

Dedicated leads and sound connections are best. I have a Square wave 600w and it doesn't like the leads it came with.

Not sure if the fan runs all the time or only when the internal temp requires cooling.
If the fan doesn't run at all/ever there might be a circuit board problem.
If only the fan it can be sourced from Jaycar.

Careful inside the unit though, and only work on it fully disconnected from battery. Lethal little boxes these things.

Toss it. Not worth repairing.
And they're lethal with 240V and no RCD

The MI-5106 is one of the better ones of that type being electrically isolated Michael and if I read you correctly you say it has no fan when it has nothing plugged into it ?
This is correct operation - fan will start when loaded or hot.
(you should have nothing plugged into it when first turning it on.)

Beeping usually occurs on low battery voltage (10.5v) , but this shouldn't be if you have no load unless your battery is flat.

Is your red fault light on - its next to on led.

I note replies above and concur that if you have a big load on it the supplied battery cables may be inadequate but they should certainly be ok for no load and small loads.

I have a friend who recently purchased a Powertech MI5700 - 180 watt Pure Sine Wave Inverter and even when connected with original short lead/cigarette lighter plug straight to battery which is near full charge with heaps of solar input it goes into overload mode. When connecting Laptop computer it operates for about a minute sometimes longer depending on the depth of discharge in the Laptop battery.
When switching on computer it (inverter) will if still running drop into overload mode immediately.
I myself have a 10 year old SEA Piccolo 150 watt Pure Sine Wave Inverter which is connected close to the battery and will run two Laptops whilst charging and using both computers.
After trying different solutions apart from cutting off the cheap looking Cigarette Lighter Plug and possibly voiding Warranty, I myself think that these inverters are not up to scratch. Even after the Agent here gave them another unit which does exactly the same he refuses to credit as they have lost their Invoice and is not being very helpful.
Oh also they have tried a friends Powertech Can type 120 watt Inverter (Modified Sine Wave) and it works fine. What to do next?
Cheers Kev.

Thank you very much guys. I will test the inverter on another battery and if that´s not the problem I try another cables.

Hope that´s it:).