[RE-wrenches] Battery RSD

[Christopher Warfel]

Good work all, and to Mr. Nelson for pursuing.  I am in the middle of 
two battery designs, and I am hoping our inspector doesn't make the same 
mistake. Now I can show this thread if so. Chris

On 7/30/2025 3:58 PM, MDElectricSolar via RE-wrenches wrote:
> Yes! Thanks to all of the amazing wrenches who continually share their 
> vast knowledge and experiences.
>
> Michael D Nelson
> MD Electric & Solar, Inc.
> 707-684-0064 mobile
> 707-884-1862 office
> www.mdelectricsolar.com
> www.facebook.com/mdelectricandsolar
>
>
>> On Jul 30, 2025, at 12:47 PM, Jason Szumlanski via RE-wrenches 
>> <re-wrenches at lists.re-wrenches.org> wrote:
>>
>> 
>> Whew! That is a relief. Good for you for taking it to the next level. 
>> These inspectors can't keep claiming that the "industry is new." They 
>> need to get with the times!
>>
>>
>> Jason Szumlanski
>> Principal Solar Designer | Florida Solar Design Group
>> NABCEP Certified Solar Professional (PVIP)
>> Florida State Certified Solar Contractor CVC56956
>> Florida Certified Electrical Contractor EC13013208
>>
>>
>> On Wed, Jul 30, 2025 at 3:33 PM MDElectricSolar 
>> <mdelectricsolar at gmail.com> wrote:
>>
>>     I emailed and eventually spoke with the building inspector
>>     supervisor and got him to agree that what they're looking for is
>>     an AC disconnect, within sight of the ESS which disconnects and
>>     locks open any connection to the house. He was going to reiterate
>>     to his inspectors that it is not between the battery and the
>>     inverter.
>>     Michael D Nelson
>>     MD Electric & Solar, Inc.
>>     707-684-0064 mobile
>>     707-884-1862 office
>>     www.mdelectricsolar.com <http://www.mdelectricsolar.com>
>>     www.facebook.com/mdelectricandsolar
>>     <http://www.facebook.com/mdelectricandsolar>
>>
>>
>>>     On Jul 30, 2025, at 12:21 PM, Jason Szumlanski via RE-wrenches
>>>     <re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>>     
>>>     True, but a suitable DC rated disconnect switch with large
>>>     enough terminals is going to be very expensive.
>>>
>>>     The whole thing boils down to the definition of an ESS. Getting
>>>     the inspector to realize that the 706.2 disconnect is not
>>>     required to be a*battery* disconnect is key here.
>>>
>>>
>>>     Jason Szumlanski
>>>     Principal Solar Designer | Florida Solar Design Group
>>>     NABCEP Certified Solar Professional (PVIP)
>>>     Florida State Certified Solar Contractor CVC56956
>>>     Florida Certified Electrical Contractor EC13013208
>>>
>>>
>>>     On Tue, Jul 29, 2025 at 11:38 PM William Miller via RE-wrenches
>>>     <re-wrenches at lists.re-wrenches.org> wrote:
>>>
>>>         Jason:
>>>
>>>         Fine stranded cables can be used with set screw terminals if
>>>         you use ferrules.
>>>
>>>         You hint at a broader point:  The industry is not providing
>>>         solutions that the regulators are demanding.  Any battery
>>>         with BMS should have a remote inhibit.  Problem solved.
>>>
>>>         William
>>>
>>>         Miller Solar
>>>
>>>         17395 Oak Road, Atascadero, CA 93422
>>>
>>>         805-438-5600
>>>
>>>         www.millersolar.com <http://www.millersolar.com/>
>>>
>>>         CA Lic. 773985
>>>
>>>         *From:*RE-wrenches
>>>         [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
>>>         Behalf Of *Jason Szumlanski via RE-wrenches
>>>         *Sent:* Tuesday, July 29, 2025 2:45 PM
>>>         *To:* RE-wrenches
>>>         *Cc:* Jason Szumlanski
>>>         *Subject:* Re: [RE-wrenches] Battery RSD
>>>
>>>         The problem I see with just complying is that there is
>>>         really no practical or cost-effective way to comply. You
>>>         would have to somehow transition from battery cable to some
>>>         other cable type, because typical fusible disconnect switch
>>>         lugs are not going to be rated to accept
>>>         fine-stranded battery cable, especially in the required size.
>>>
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-- 
Christopher Warfel, PE
ENTECH Engineering, Inc.
PO Box 871, Block Island, RI 02807
(401) 447-5773
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