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5 kva/5kw axpert inverter not switching on


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after a very cold 2 days, the axpert inverter does not power up at all,,, even the PV in is 115vdc and also tried with the generator still the same, any idea what i could be, i only hear the clicking sound inside a very fast clicking like relay cliking

WhatsApp Image 2020-09-05 at 09.32.52.jpeg

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What Voltage are your Batteries.

Mine did the same when i checked the batteries they were flat. 

I charged the batteries one by one, i had 4 12v batteries. 

I replaced it recently with a 48v Lithium kit and is now planning to build an external charger in case it happens again. 

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6 hours ago, divhy said:

battery is sitting at 43vdc


3 hours ago, divhy said:

i have a 48v lithium battery

A lithium battery at 43V is fully discharged, and has probably been shut down by it's BMS. 

What type of battery is it? 15S, 16S?

 Are you measuring 43V at the inverter, or inside the battery?

If you disconnect (and switch on) the battery, what voltage does it give?

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I think it could be one of:

a) the inverter has a fault such that it draws a lot of current soon after turning on. That trips the BMS, the inverter turns off, the BMS sees no overload, turns back on, and this repeats over and over, causing the repeated clicking sound.

b) The battery SOC is very low. As soon as the inverter starts to draw even moderate current, the battery voltage collapses, unable to support even a small load, such as when the bus capacitors are pre-charged. This collapse of voltage causes the inverter electronics to lose power, so it turns off. This removes the load from the battery, the battery voltage restores to around 43 V, and the cycle repeats.

If it's (a), then make sure that you have overload protection in place, such as a battery fuse or DC rated breaker.

If you have a current limited power supply capable of providing about 40 V, that would be ideal to use for testing in place of the battery. Set the current limit to at least 2 A, to allow the inverter to get started. Even 2-3 A may not enough to start the inverter, but at least you might be able to see a fault code. This power supply could also start charging your lithium battery, which sorely needs charging. Once you get the battery voltage above about 48 V, the battery may be able to start the inverter (if it's situation b) above), and you may be able to have PV or utility charging take over.

Edited by Coulomb
power supply would be for testing in place of battery
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19 hours ago, divhy said:

if i disconnect the battery and try to switch it on,, it only blinks quickly and shut off... before it gives voltage out. 

Oh, wait. You mean even with the battery disconnected from the inverter, just on its own, it won't even provide voltage?

Then it really needs recharging, and it's situation b) from the above post. You really need that current limited power supply.

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yes, thanks you very much, i will tackle both attempts, cause battery disconnected it is not reading anything, 


to my surprise i thought it will pick up once the utility is connected , but however i will have to make a plan to have atleast 43v connected on the battery side and see 


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