Solar generation for last qtr

[flyonthewall]

Yeah, string will be a series of 8 panels and 2 strings on each system I assume. So 4 cables entering the base of the inverter from rooftop.

That solar hour calculation I did is at your pitch and south east angle, so it’s what you should be achieving.

I expect you may have a blown mc4 on both systems on one string. You have 4 external mc4. 2 on the positive and 2 on the negative cables connecting the series of panel.

Switch everything off. Remove a string and start up the inverter then switch off and plug back in and remove the other string and switch on < that’s the untrained way of testing whether a string is faulty having no dc test kit.

Solar panels usually have what’s called bypass diodes. If a panel doesn’t complete its circuit run then the current bypasses though and continues on. Only when there is an mc4 fault does it cease circuit.

Test out on a sunny day, lunchtime.

So would the MC4 be only faulty/shorting when it's wet. I was rather fearing a panel was leaking and shorting when wet.

 

[akaPABLO01]

So would the MC4 be only faulty/shorting when it's wet. I was rather fearing a panel was leaking and shorting when wet.

I suspect an mc4 fault 9/10 times.

Lightning strike could be a cause but 2 lightning strikes on both solar systems probably has similarity to lottery odds but could happen.

Mc4 lifespan is about 5 years at worse.

I wouldn’t do anything until February personally.

All my sites are shut down and repairs will only begin February, if that helps.

Use this site to find your local installer

http://www.microgenerationcertification.org/consumers/installer-search