skyman's latest activity

No it didn’t matter Each string worked fine separately. After reboot I plugged both strings into the inverter but showed an isolation...

Well, the inverter displays the voltage under load but I don’t think it’s 100% accurate. here is the manual uploaded as pdf as i didn’t...

@Zwy one additional info I forgot to add : Behind the inverter I have an AC breaker ( 3 poles !) Every time I shut down the inverter...

okay, just wanted to say a big thank you for all the help ! I just measured the VOC voltage after shutting down the inverter and here...

Panels are colder in morning and VOC will be higher when the inverter runs the test. As morning progresses, VMP drops as panels get...

@Zwy Thank you very much for this. A faulty isolation relay is a potential cause. if there is a sustained earth fault on the DC side...

Without the model of inverter and possible link to the manual it is a wild guess. I did read in another Kaco model manual the...

The error is a typical isolation fault

- No ,i didn’t install it - String 1 ( 20 panels ) is on the house‘s roof While string 2 (10 panels ) is over the garage ( so only 10...

AC side or DC side ? For the DC side I am using 4 mm2 DC cable up to 1000 volt

May i ask you what is 15s? If I connect only one string ( no matter which one ) the inverter connects to grid and starts working...

Well according to the manufacturer if the MPP voltage is not reached, current is generated but not too much

Exactly, string one has 10 panels ( voc 31 volt per string ) while string 2 has 20 panels ( voc 31 volt per string ) The panels are...

Ok,good point! your explanation does make sense. However the documentation contradicts what you saying as the MPP track range is...

The ground wire is the yellow one. I have a 2012 kaco inverter (made in Germany ) it has two MPP tracker, according to the documentation...

@wpns Great find ! I am happy for you My inverter is a 3 phase inverter but not hybrid. I didn’t have yet issues with tripping the AC...

Thank you for your comment and information. I am aware of the safety precautions, but let’s forget the insulation resistance for now and...

@wpns You mentioned that sometimes there may be a short at high applied voltages. Could you please explain a little ? Thx

Please don’t get me wrong : I understand that a megger is needed if you want to measure the insulation resistance by shortconnecting...

well this is actually a very important tip. My inverter shows an isolation fault after I reboot it! My inverter is a transformer-less...