Hi all,

 

I have a client who has 2 x 4KW Axperts in paralell with 24 x 2v flooded batteries and 12 x 250wp poly modules. Installation was done in December 2015 and of late the inverters are switching off and back on after a second or two. They mainly experience this at night. He says he doesn't believe that the inverters are overloading as they stagger the loads, but he and I will do an over load test. Anyone who may know what else (i.e. other than an overload) may cause the inverters to switch off and on?

Many thanks,

Aldre

They mainly experience it at night? Check battery voltage... it might drop too low, for whatever reason :-)

Don't the axperts have an energy saving mode? If the load

Is too low, they power off to save power?

Maybe confirm this is also disabled so it won't power off.

I believe the power saving mode is disabled when you have paralled inverters.

I had the same problem with Axpert. This is the power saving setting that switches the unit off although some appliances is drawing current.

I think the loaf current sensing is not to accurate.

I have an Arduino setup to measure the actual batt and pv currents and voltages and logs them. I found the inveter is not that accurate though.

2 hours ago, vandyh said:

I have an Arduino setup to measure the actual batt and pv currents and voltages and logs them. I found the inveter is not that accurate though.

Pray tell us more of the device and why the inverter is not that accurate?