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Old 05-26-20, 05:49 PM   #16
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Originally Posted by madsci1016 View Post
Are you going micro inverter for your new system? Seems like the code change starting January of this year pretty much forces you to go that way. As it's now cheaper to do $130 micro inverter per panel than a large $1800 inverter plus $80 rapid shutdown module per panel. (EDIT, NVM, looks like you said you went micro with the first system anyway).
The shutdown switches can just be DC SSRs (not cheap, but less than $80 each) and a $20 PVAF-T2 takes care of the arc fault detection part.

An even cheaper way would be to use a DC rated switch or relay to short the string, but that would require all the panels to be able to withstand a constant short circuit.
To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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