[RE-wrenches] Battery RSD

[Jason Szumlanski]

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
> 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
>>
>> 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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