Hi Guys,

 

Something that is not very clear to me in the manual of these 8kw inverters.

These have two PV inputs, is it maximum 500VDC  VOC per input, or 250VDC VOC per input (total of 500VDC per 2 PC inputs)?

thanks a lot!

The Manual states 500VOC
Thus 500 V max per MPPT also keeping in mind no more than 4000W per MPPT.
Seeing that most higher powered panels lately are in the 45 to 50V VOC and around 13A, target around 400V i.e. maybe 8 panels of 50V in Series on any one MPPT. That will give you some headroom should temperatures be low as your operating Voltage should not exceed 450V

Edited October 18, 20223 yr by zsde

Hi ZSDE,

Thank you VERY much for your answer! I was thinking the same, but had some doubts...

I have 6 panels (550W - VOC 49VDC) in serie on each input   (total of 12 panels - 6600W        - 3300W per input)

That should be good, right?  Because I already have 2 inverters that died on that installation, one Sorotec 8kw, one SAKO sunpolo 8kw

The Sorotec inverter works a little bit, meaning it just does strange things, knowing for sure that the panels should give min. 5kw output (full sun), at a load of 500w / 1kw / 2kw it  takes power from the grid.  Even sometimes there is a load of e.g. 300watts, it shows that it takes 2300 watts from the panels.....

The SAKO give: running status fault, no AC output, even without PV input.

I am sure about the whole installation, PV connection strings into the inverter (polarity),  no voltage leak, etc... I measured everything with a voltmeter. (I have around 282 VDC

per string)

SO I was wondering about the Max VDC input per MPPT.   The word "array" confuses me as in "Maximum PV array Open Circuit Voltage"

 

thank you

Just as an update, ZSDE is absolutely correct, many websites say that it are 2 independent MPPT connections, each can handle 500 VOC.

I have seen many people complaining about the Axpert MAX II 8kw clones, all related with MPPT tracking not working correctly...