[RE-wrenches] Remote load shedding

[david quattro]

GENERAC also makes a 100 amp version of the SMM



On Tue, Jun 27, 2023 at 3:12 AM Jason Szumlanski via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> I'm interested in this also. This is becoming increasingly necessary as we
> install "whole home" backup systems, but we need to dump a load that is on
> a downstream subpanel. A common need is to shed pool equipment like
> electric heat pumps and pool pumps when utility power is lost. In other
> cases, the backup system interconnection point is outside at a meter/main
> combination service entrance device, but the loads we need to shed are on a
> downstream distribution load center.
>
> Sometimes wiring control cables to do this is cumbersome or virtually
> impossible.
>
> A while back I ended up purchasing a 24Vac remote 900 Mhz relay to shed
> air conditioning, but ultimately I never installed it because it was too
> complicated and introduced an unacceptable point of failure (potential
> service issue). We need some reliable, simple load shedding products that
> are brand agnostic.
>
> Jason Szumlanski
> Principal Solar Designer | Florida Solar Design Group
> NABCEP Certified Solar Professional (PVIP)
> Florida State Certified Solar Contractor CVC56956
>
>
> On Tue, Jun 27, 2023 at 1:06 AM Mac Lewis via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hello Wrenches,
>>
>> Is anyone aware of a remote load shedding solution that doesn't require
>> additional signal wiring to the loads?
>>
>> Generac has a great solution for this that they adapted from their
>> generator business called a Generac Smart management module.  Its a 2P x
>> 50A relay that monitors line frequency going to the load and it will trip
>> it off line when the frequency sags.  The inverter does a small wiggle that
>> will trip it offline based on some Dip switch settings. on the unit.  This
>> really simplifies code compliance in some cases.
>>
>> I'm wondering if there are any other more general solutions out there for
>> this.
>>
>> Thanks in advance!
>>
>>
>>
>> --
>>
>>
>>
>> Mac Lewis
>>
>> *"Yo solo sé que no sé nada." -Sócrates*
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David Quattro
CA License # 954020. C-10, C-46
ph (415) 312-2661
www.quattrosolar.com
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