[RE-wrenches] Battery RSD

Tue Jul 29 15:30:33 PDT 2025

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

On Tue, Jul 29, 2025 at 2:47 PM Blair May via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Sue what happened to the Birdhouse. My e panel has shunt tripped 250A
> battery breakers that is acquitted outside the building.
> Tump
>
> Blair "Tump" May
>
> On Tue, Jul 29, 2025, 1:09 PM Sue Stankevitz via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Midnite does not offer an outdoor rated enclosure for our large breakers
>> but if only 100a was needed as Mike was asking about our MNPV3 with an
>> MNEPV100(100a DC breaker) would be outdoor rated and lockable.
>>
>>
>>
>> Sue Stankevitz
>> MidNite Solar, Inc. <https://www.midnitesolar.com/index.php>
>> (360) 403-7207 (XT122)
>>
>>
>>
>> *From:* RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> *On
>> Behalf Of *MD Electric & Solar via RE-wrenches
>> *Sent:* Tuesday, July 29, 2025 12:46 PM
>> *To:* jay <jay.peltz at gmail.com>
>> *Cc:* MD Electric & Solar <mdelectricsolar at gmail.com>; RE-wrenches <
>> re-wrenches at lists.re-wrenches.org>
>> *Subject:* Re: [RE-wrenches] Battery RSD
>>
>>
>>
>> Wondering if Midnight solar makes something outdoor rated, with a typical
>> 250ADC breaker, like this:
>>
>> Outdoor rated, lockable....
>>
>>
>> https://www.midnitesolar.com/productPhoto.php?product_ID=76&productCat_ID=8&sortOrder=5&act=p
>>
>>
>>
>> On Tue, Jul 29, 2025 at 9:39 AM jay <jay.peltz at gmail.com> wrote:
>>
>> Maybe if you left the key on a chain to open the door, and placard with
>> instructions on the outside that would work?
>>
>>
>>
>>
>>
>> On Jul 29, 2025, at 10:23 AM, MD Electric & Solar <
>> mdelectricsolar at gmail.com> wrote:
>>
>>
>>
>> Correct, it does not have an external disconnect, but if you open the
>> cover, each battery has it's own disconnect and the Sol-Ark has a battery
>> disconnect.
>>
>> Looks like I'm in the market for a 100 amp rated outdoor, lockable DC
>> rated knife switch.
>>
>> Mike
>>
>>
>>
>> On Tue, Jul 29, 2025 at 9:16 AM jay <jay.peltz at gmail.com> wrote:
>>
>> I had to look up that battery enclosure and if I understand correctly it
>> does not have an external breaker/disconnect so yes the inspector is
>> correct in the need for one if I understand.
>>
>>
>>
>> jay
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> On Jul 29, 2025, at 10:09 AM, MD Electric & Solar <
>> mdelectricsolar at gmail.com> wrote:
>>
>>
>>
>> Here is the reference, attached.
>>
>>
>>
>> On Tue, Jul 29, 2025 at 8:49 AM jay <jay.peltz at gmail.com> wrote:
>>
>> I’ll let the code experts chime in, but I would ask for the code
>> reference they are referring to.
>>
>> The only one I can think of has to do with if the batteries are on the
>> other side of a wall.
>>
>>  Thats as clean an install as they come
>>
>> jay
>>
>>
>>
>> > On Jul 29, 2025, at 9:43 AM, MDElectricSolar <mdelectricsolar at gmail.com>
>> wrote:
>> >
>> > <image0.jpeg>
>> > Michael D Nelson
>> > MD Electric & Solar, Inc.
>> > 707-684-0064 mobile
>> > 707-884-1862 office
>> > www.mdelectricsolar.com
>> > www.facebook.com/mdelectricandsolar
>> >
>> >
>> >> On Jul 29, 2025, at 8:06 AM, Jay via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>> >>
>> >> What is the layout of the equipment
>> >>
>> >> Are the batteries next to and therefore in sight of the inverter?
>> >>
>> >> Jay
>> >>
>> >>> On Jul 29, 2025, at 8:44 AM, MDElectricSolar via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>> >>>
>> >>> Wrenches,
>> >>> I have a building inspector in my county of Sonoma who has just told
>> me that we need to install a rapid shutdown switch of some type between my
>> LFZ battery bank and my Solark 15k inverter. He mentioned some type of
>> knife switch within 5 feet of the equipment. I cannot find any reference to
>> this requirement anywhere but he insists it is required. These batteries
>> happen to be simplify or brakes and Stratton batteries and each battery has
>> its own 80 amp breaker on the battery and the Solark has a battery
>> disconnect switch built-in. We do have module level RSD which kills the
>> solar output as well as the inverter output when the button is pushed. Does
>> anyone have any experience with this or can they point me to the correct
>> code section or what are others doing to comply with this requirement?
>> >>>
>> >>>
>> >>> Michael D Nelson
>> >>> MD Electric & Solar, Inc.
>> >>> 707-684-0064 mobile
>> >>> 707-884-1862 office
>> >>> www.mdelectricsolar.com
>> >>> www.facebook.com/mdelectricandsolar
>> >>>
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>>
>> --
>>
>> Michael D Nelson
>>
>> MD Electric & Solar Inc.
>>
>> Office: 707-412-3181
>>
>> Cell: 707-684-0064
>>
>> www.mdelectricsolar.com
>>
>> www.facebook.com/mdelectricandsolar
>>
>>
>>
>>
>>
>> <PRMD BLD_20250728_062230.pdf>
>>
>>
>>
>>
>>
>>
>> --
>>
>> Michael D Nelson
>>
>> MD Electric & Solar Inc.
>>
>> Office: 707-412-3181
>>
>> Cell: 707-684-0064
>>
>> www.mdelectricsolar.com
>>
>> www.facebook.com/mdelectricandsolar
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> --
>>
>> Michael D Nelson
>>
>> MD Electric & Solar Inc.
>>
>> Office: 707-412-3181
>>
>> Cell: 707-684-0064
>>
>> www.mdelectricsolar.com
>>
>> www.facebook.com/mdelectricandsolar
>>
>>
>>
>>
>> _______________________________________________
>> List sponsored by Redwood Alliance
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