I'm kinda confused. With more transformerless inverters on the market (e.g., SMA and Power-One), it's not clear to me if double insulated wiring needs to be used all the way from each series string to their respective inverter.
We've been installing the P1 3-6 kW TL inverters and there's no apparent mention of needing to use such conductors, yet I remember needing to do so when I installed a number of the 8, 9 and 10 kW SMA TL inverters. Thanks, marco
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