Battery based rapid shut down is not simple. Much of it is up to the
AHJ. You can shut down the AC output or the battery or both. Shunt trip
battery breakers do not cost much more than regular battery breakers.
You do need to control them though. That is what the Birdhouse and
MNbattery disc
First, its the added cost of the disconnecting combiner, RT breakers,
control boards, Main initiator, and extra labor for wiring and testing.
I'd say it ads another $2 to $3K of cost. Not a big deal on large
systems but for a smaller off grid project in the $10K range, its a huge
increase in c
Jeff,
I just went through this. The SI and the US 40s still work together.
They do not use a 485 card. The Sunny Boys are programmed in off grid
mode, and the Sunny Islands take care of the UL1741 requirements.
Tim at SMA gave me this information. The Sunny Boys will taper charge
as shown on
Hello Ray -- Can you elaborate on why these battery-based projects are
getting killed here locally? Is it the misinterpretation by AHJs that
690.12 has to disconnect the inverter from the battery bank with giant
shunt-trip breakers? If that were the case...backup generators would have
to be control
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