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thankyou,,my system has 16 pannels,in 2 strings,,i was concearned about doing an insulation test using a 500v megger,because i understand the array on the roof has junction boxes with bypass diodes and was worried abt damageing them,or the pannels,,...question to binky,andy ,and prodave,cheers

hi guys i have solar pv on my roof,with a dc insulation fault, i suspect its due to water ingress.there are two strings,thats 2 pairs of wires going up to the pannels.iv  tested each pair with a multitester, having firstly disconected from the isolators and are geting the following .L=N ...