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

Fri Jun 18 15:05:32 EDT 2021

MiJo,

I’m feeding the transfer switch/backup panel via the Sol-Ark’s load output. This is a net metering application with select loads backed up. 

Chris Mason was able to help resolve my issue. Generac offers a kit to convert my customer’s particular generator to a 2 wire start. 

rick brown
SolShine Energy Alternatives, LLC
Electrical & Solar Contracting Services
www.SolShineEnergy.com
Check, Virginia 24072
O: 540.235.3095
M: 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

> On Jun 17, 2021, at 8:41 PM, MiJo Nels <spaceshipnelson1 at gmail.com> wrote:
> 
> Hey Rick, are your loads in this scenario not all behind the SolArk (and already capable of all no-back feed scenarios including zero export?) 
> 
> Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
> Get Outlook for Android
> 
> From: MiJo Nels <spaceshipnelson1 at gmail.com>
> Sent: Thursday, June 17, 2021 5:38:36 PM
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: Re: [RE-wrenches] Sol-Ark 12k w/ Generac Transfer Switch
>  
> 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.   
> 
> Sent via the Samsung Galaxy S21 5G, an AT&T 5G smartphone
> Get Outlook for Android
> 
> 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 <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
>> 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
>> 
>> <PastedGraphic-1.tiff>
>> 
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>> -- 
>> Dave Tedeyan, PE
>> 
>> 1653 Slaterville Road, Ithaca, NY 14850
>> Cell: 607-288-2898
>> www.sungineersolar.com
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