[RE-wrenches] Battery RSD

Tue Jul 29 17:59:29 PDT 2025

Thank you all for your comments. I am going to bat with the Sonoma County
building department, and will report back.
Mike

On Tue, Jul 29, 2025 at 3:27 PM Bradley Bassett via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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
>>>
>>>
>>>
>>>
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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
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