So I finally got around to connecting my 3k24v Axpert inverter to power and I am worried that something has gone wrong!

I don't have any batteries, solar panels or load connected to the inverter. The only cable which is connected to the inverter is the AC input cable.

When I turn on the circuit breaker feeding the inverter I measure 241volts AC at the AC input terminal on the inverter.

The issue I am having is that when I turn the power to the unit on it starts beeping loudly every second and the LCD display turns on and off at the same time (every second). I have tried pressing and holding the buttons on the panel and this makes no difference?

Could this be happening because I don't have any load or batteries connected?

You must have a battery bank connected!!

 

regards

Mark

Thanks Mark, I was getting worried that I got a dud inverter.

Thanks Mark, I was getting worried that I got a dud inverter.

Also check and make sure your get the minimum ah bank for the 3k24V.

 

Cheers

Mark

Some of the cheap Chinese inverters will turn on and appear to "work". I've seen one such a UPS :-) The Victron units won't even turn on :-)

Thanks guys, really appreciate the advice. I read that the minimum aH bank for the 3k24v is 100aH, I will be installing 2 x 260aH 12v batteries in series.

Still have loads of questions to ask before I install the batteries, they will be arriving in the next 2 weeks or so.

I've got the victron BMV702 monitor and wanted to connect it for midpoint monitoring, I know the manual says to use bus bars for midpoint voltage monitoring, but it then goes on to say that if only 1 string of 2 batteries is used that the B1 and B2 cables can be connected directly to the battery post.

Has anyone on the forum done this and has success?

Has anyone on the forum done this and has success?

 

I have 1 string of 4 x  260Ah batteries in series and the cables from the inverter (the battery disconnect actually) connect directly to the battery poles. You only need a busbar when you have more than one string. Wiring 2 batteries should be easy and the midpoint voltage wiring too (directly to the battery pole)..

Great stuff, thanks Chris

Thanks guys, really appreciate the advice. I read that the minimum aH bank for the 3k24v is 100aH, I will be installing 2 x 260aH 12v batteries in series.

 

The minimum charging current on the 3K24V is 20A and since most battery manufacturers suggest a maximum charging current of 10% of the Ah rating (20h) of the battery bank, you should actually not connect a smaller bank than 200Ah - and that is only if you change the charging current to 20A instead of the 30A default.

 

Some battery manufacturers advise that you can charge their batteries at up to 13% of the Ah rating (20h) which would give you an absolute minimum battery bank of approximately 150Ah.