[RE-wrenches] Sol-Ark 12k w/ Generac Transfer Switch

[MiJo Nels]

We have started doing away with the ATS all together. Generac recently released a FW code you can enter to indicate to the generator you want it to Start/Stop with 2-wire configuration. A generator that size I would feed directly into the SolArk and let the SolArk Start/Stop function. This will increase the "Up Time" of the inverter as it will always have a secondary power source it can call on when there's a low SOC.

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________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of William Miller <william at millersolar.com>
Sent: Thursday, June 17, 2021 9:11:30 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Sol-Ark 12k w/ Generac Transfer Switch

Friends:

I dislike jury-rigging a generator loss-of-grid start signal to a two-wire start. If the inverters need to be shut down for service or happen to shut down on their own, the generator will start. Not a good design.

William Miller
www.millersolar.com

On Jun 17, 2021, at 6:48 AM, Dave Tedeyan <dave at sungineersolar.com> wrote:


Hi Rick,
I have a similar situation with a GE transfer switch, but am curious to hear what others have to say. My assumption was that the switch transfers based on loss of 240V from the grid. But I believe (at least with the GE generator) that the transfer switch sends a two wire start signal to the inverter when the transfer switch loses the 240V signal. My plan was to rewire that start signal to the Sol-Ark inverter, but keep the transfer switch as the main service point to prevent any kind of backfeeding to the grid.
Cheers,
Dave

On Thu, Jun 17, 2021 at 9:41 AM rick at solshineenergy.com<mailto:rick at solshineenergy.com> <rick at solshineenergy.com<mailto:rick at solshineenergy.com>> wrote:
Wrenches,

I’m looking to tie in a Generac Powerpact 7.5kW generator with transfer switch to a Sol-Ark 12kW. The Sol-Ark has a two wire start (NO or NC) capability, however, the Generac transfer switch operates on loss of 240V. Is my only option to use a relay driven by the two wire start to drop 240V to the transfer switch?

Thank you,

rick brown
SolShine Energy Alternatives, LLC
Electrical & Solar Contracting Services
www.SolShineEnergy.com<http://www.SolShineEnergy.com>
Check, Virginia 24072
Office: 540.235.3095
Mobile: 540.808.9502

VA Class A Contractor Lic# 2705147660
VA Master Electrician Lic# 2710062762
VA Alternative Energy Systems Installer
NABCEP Certified PV Installation Professional 110112-21

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--
Dave Tedeyan, PE
[Sungineer Solar]
1653 Slaterville Road, Ithaca, NY 14850
Cell: 607-288-2898
www.sungineersolar.com<http://www.sungineersolar.com/>
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