[RE-wrenches] Large Residence ESS and NFPA 855

[Jason Szumlanski]

That is how I am reading it. Complying with chapters 4 through 9 would be
required. However, I think it will be impossible to comply given the fire
suppression requirements. This is a remote off-grid installation, and water
supply would be an issue. And I'm not sure how to go about finding someone
to write up a commissioning and decommissioning plan.

On Thu, May 30, 2024, 8:38 AM Brian Mehalic via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I'm not looking at the most recent editions right, but the previous
> versions of both 855 and the IRC both have statements to the effect of "ESS
> installations exceeding the permitted individual or aggregate ratings shall
> be installed in accordance with Section xxx" (pointing to the IFC in the
> case of the IRC, and pointing to Chapters 4-9 in the case of 855), in other
> words basically follow the (more onerous) rules for ESS on other than one-
> and two-family dwellings.
>
> Brian Mehalic
> NABCEP Certified Solar PV Installation Professional™ R031508-59
> National Electrical Code® CMP-4 Member
> (520) 204-6639
>
> Solar Energy International
> http://www.solarenergy.org
>
>
>
> On Thu, May 30, 2024 at 3:17 AM Jason Szumlanski via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Has anyone dealt with a large ESS installation that exceeds the aggregate
>> storage limits in NFPA 855? The limits are quite low for very large single
>> family homes. I have a situation where we need 120 kWh minimum for an
>> off-grid home. There is a building dedicated for the inverters and
>> batteries that is 400 feet from the main home. The intent was to house the
>> batteries there, but we are in excess of the 80 kWh limit for an accessory
>> structure. It would be impractical to house part of the batteries on an
>> exterior wall.
>>
>> Are there any "loopholes" that might allow this larger ESS for this
>> property? And if not, has anyone attempted to comply with Ch 4-9? That
>> seems onerous.
>>
>> Jason Szumlanski
>> Florida Solar Design Group
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