[RE-wrenches] Battery RSD

[William Miller]

Bradley:



Is he shunt trip breaker UL rated? If not, it’s not an option.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Bradley Bassett via RE-wrenches
*Sent:* Tuesday, July 29, 2025 3:31 PM
*To:* RE-wrenches
*Cc:* Bradley Bassett
*Subject:* Re: [RE-wrenches] Battery RSD



What I used to specify for exterior disconnect for a battery bank was the
MidNite MNLBC-W250. I believe you can connect larger battery cables to
input and output bypassing the smaller busbar input.

https://www.midnitesolar.com/productPhoto.php?product_ID=687&productCat_ID=9&sortOrder=1&act=p

If rapid shutdown is also required you can substitute the breaker with a
remote trip version for the main 250A breaker. It needs a 24VDC signal to
trip and is manually reset so it's not ideal, but costs far less than a
true DC rated disconnect.



However, it seems to me, agreeing with others here, that it should not be
required in this case, that the breaker in the inverter should suffice.



Brad Bassett
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