Re: [RE-wrenches] automatic transfer switches

2019-11-29 Thread Chris Mason 
If you are doing it on the AC side, a Generac transfer switch has the
capability and is designed to do this. It's easy to rig an interface as I
discussed privately with Bill.

On Fri, Nov 29, 2019 at 1:29 AM Jerry Shafer 
wrote:

> Wrenches
> Need to be careful here to use something that has the interrupt KVA rating
> required to prevent an arc in the event of an under load opening with the
> switch proper AIC rating 10,000 or more, last thing I think you want is to
> have that kind of liability on products that are not designed for that type
> of use. But thats just me.
> NABCEP PV Inspector
> California Solar contractor
> Jerry
>
> On Mon, Nov 25, 2019 at 8:52 PM Bill Hennessy  wrote:
>
>> hi folks--
>>
>> We're installing a grid-tied, battery backup system on a farm where the
>> service entrance is on a pole in the yard. At the single-phase, 240v,
>> service entrance, there are two main breaker subpanels--one going to the
>> house and one to the barn. The buildings are each about 100 feet away from
>> the pole in opposite directions. The PV/battery system is located in the
>> barn. When utility power is lost and the battery backup kicks in, we are
>> looking for a way to bypass the house subpanel at the pole so it won't
>> backfeed the grid.
>>
>> When the grid drops out, we need to tie the backup power coming from the
>> barn to the line going to the house. We're thinking an automatic transfer
>> switch installed at the pole will do the job, but the transfer switches
>> seem to have built in delays to work with starting a generator. The
>> switch does not have to be service entrance rated.
>>
>> It looks like the Asco 300 series has time delay adjustments, but it is
>> pricey and has a seven-week lead time. (Thank-you PG)
>>
>> The battery backup system will switch over in milliseconds and we were
>> hoping to find something similar for the transfer operation at the pole.  
>> We're
>> looking for something simple--hopefully a basic transfer switch that will
>> quickly switch and drop out when grid power is restored.
>>
>> Would appreciate any thoughts or suggestions.
>>
>> regards, bill
>>
>> Bill Hennessy
>> Berks Solar, LLC
>> 371 Centennial Rd
>> Mertztown, PA 19539
>>
>> o 610 682 4300
>> c 484 560 4666
>> NABCEP certified installer
>> PA contractor #44411
>> www.berkssolar.com
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-- 
Chris Mason
Solar systems designer
Generac Generators Industrial technician

Comet Systems Ltd DBA Comet Solar
Anguilla Cell  264.235.5670
WhatsApp 264.235.5670
Skype: netconcepts
www.cometsolar.com 
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Re: [RE-wrenches] automatic transfer switches

2019-11-28 Thread Jerry Shafer 
Wrenches
Need to be careful here to use something that has the interrupt KVA rating
required to prevent an arc in the event of an under load opening with the
switch proper AIC rating 10,000 or more, last thing I think you want is to
have that kind of liability on products that are not designed for that type
of use. But thats just me.
NABCEP PV Inspector
California Solar contractor
Jerry

On Mon, Nov 25, 2019 at 8:52 PM Bill Hennessy  wrote:

> hi folks--
>
> We're installing a grid-tied, battery backup system on a farm where the
> service entrance is on a pole in the yard. At the single-phase, 240v,
> service entrance, there are two main breaker subpanels--one going to the
> house and one to the barn. The buildings are each about 100 feet away from
> the pole in opposite directions. The PV/battery system is located in the
> barn. When utility power is lost and the battery backup kicks in, we are
> looking for a way to bypass the house subpanel at the pole so it won't
> backfeed the grid.
>
> When the grid drops out, we need to tie the backup power coming from the
> barn to the line going to the house. We're thinking an automatic transfer
> switch installed at the pole will do the job, but the transfer switches
> seem to have built in delays to work with starting a generator. The
> switch does not have to be service entrance rated.
>
> It looks like the Asco 300 series has time delay adjustments, but it is
> pricey and has a seven-week lead time. (Thank-you PG)
>
> The battery backup system will switch over in milliseconds and we were
> hoping to find something similar for the transfer operation at the pole.  
> We're
> looking for something simple--hopefully a basic transfer switch that will
> quickly switch and drop out when grid power is restored.
>
> Would appreciate any thoughts or suggestions.
>
> regards, bill
>
> Bill Hennessy
> Berks Solar, LLC
> 371 Centennial Rd
> Mertztown, PA 19539
>
> o 610 682 4300
> c 484 560 4666
> NABCEP certified installer
> PA contractor #44411
> www.berkssolar.com
> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
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>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
>
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Re: [RE-wrenches] automatic transfer switches

2019-11-26 Thread Chris Mason 
If you only want to change over, why not use a contactor with three poles,
a NO and NC contact? that will switch instantly. Use Utility to power the
coil, it will switch to utility when the power is restored.

On Tue, Nov 26, 2019 at 2:57 AM Jerry Shafer 
wrote:

> There is the SMA Automatic transfer switch if you go with the SMA battery
> inverter and SMA pv inverter, it can be located seperate of the battery and
> inverter and will take up to 30 kwhrs. of capacity
> Just a thought
>
> On Mon, Nov 25, 2019, 10:52 PM Bill Hennessy  wrote:
>
>> hi folks--
>>
>> We're installing a grid-tied, battery backup system on a farm where the
>> service entrance is on a pole in the yard. At the single-phase, 240v,
>> service entrance, there are two main breaker subpanels--one going to the
>> house and one to the barn. The buildings are each about 100 feet away from
>> the pole in opposite directions. The PV/battery system is located in the
>> barn. When utility power is lost and the battery backup kicks in, we are
>> looking for a way to bypass the house subpanel at the pole so it won't
>> backfeed the grid.
>>
>> When the grid drops out, we need to tie the backup power coming from the
>> barn to the line going to the house. We're thinking an automatic transfer
>> switch installed at the pole will do the job, but the transfer switches
>> seem to have built in delays to work with starting a generator. The
>> switch does not have to be service entrance rated.
>>
>> It looks like the Asco 300 series has time delay adjustments, but it is
>> pricey and has a seven-week lead time. (Thank-you PG)
>>
>> The battery backup system will switch over in milliseconds and we were
>> hoping to find something similar for the transfer operation at the pole.  
>> We're
>> looking for something simple--hopefully a basic transfer switch that will
>> quickly switch and drop out when grid power is restored.
>>
>> Would appreciate any thoughts or suggestions.
>>
>> regards, bill
>>
>> Bill Hennessy
>> Berks Solar, LLC
>> 371 Centennial Rd
>> Mertztown, PA 19539
>>
>> o 610 682 4300
>> c 484 560 4666
>> NABCEP certified installer
>> PA contractor #44411
>> www.berkssolar.com
>> ___
>> List sponsored by Redwood Alliance
>>
>> List Address: RE-wrenches@lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive:
>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>>
>> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
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-- 
Chris Mason
Solar systems designer
Generac Generators Industrial technician

Comet Systems Ltd DBA Comet Solar
Anguilla Cell  264.235.5670
WhatsApp 264.235.5670
Skype: netconcepts
www.cometsolar.com 
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Re: [RE-wrenches] automatic transfer switches

2019-11-26 Thread Mac Lewis 
Hi Bill,

We just did something like this with a hydro plant and backup solar site.
We ended up using a Kohler RDT transfer switch with the accessory board.
With the accessory board, its possible to adjust down to about ~1 second
transfer, and without the accessory board, its ~3 second transfer.  The RDT
switch is relatively cheap and well made in various builds.  You just need
to keep the backup inverter voltage output continuously on the emergency
terminals.

Good Luck

On Mon, Nov 25, 2019 at 11:57 PM Jerry Shafer 
wrote:

> There is the SMA Automatic transfer switch if you go with the SMA battery
> inverter and SMA pv inverter, it can be located seperate of the battery and
> inverter and will take up to 30 kwhrs. of capacity
> Just a thought
>
> On Mon, Nov 25, 2019, 10:52 PM Bill Hennessy  wrote:
>
>> hi folks--
>>
>> We're installing a grid-tied, battery backup system on a farm where the
>> service entrance is on a pole in the yard. At the single-phase, 240v,
>> service entrance, there are two main breaker subpanels--one going to the
>> house and one to the barn. The buildings are each about 100 feet away from
>> the pole in opposite directions. The PV/battery system is located in the
>> barn. When utility power is lost and the battery backup kicks in, we are
>> looking for a way to bypass the house subpanel at the pole so it won't
>> backfeed the grid.
>>
>> When the grid drops out, we need to tie the backup power coming from the
>> barn to the line going to the house. We're thinking an automatic transfer
>> switch installed at the pole will do the job, but the transfer switches
>> seem to have built in delays to work with starting a generator. The
>> switch does not have to be service entrance rated.
>>
>> It looks like the Asco 300 series has time delay adjustments, but it is
>> pricey and has a seven-week lead time. (Thank-you PG)
>>
>> The battery backup system will switch over in milliseconds and we were
>> hoping to find something similar for the transfer operation at the pole.  
>> We're
>> looking for something simple--hopefully a basic transfer switch that will
>> quickly switch and drop out when grid power is restored.
>>
>> Would appreciate any thoughts or suggestions.
>>
>> regards, bill
>>
>> Bill Hennessy
>> Berks Solar, LLC
>> 371 Centennial Rd
>> Mertztown, PA 19539
>>
>> o 610 682 4300
>> c 484 560 4666
>> NABCEP certified installer
>> PA contractor #44411
>> www.berkssolar.com
>> ___
>> List sponsored by Redwood Alliance
>>
>> List Address: RE-wrenches@lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive:
>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out or update participant bios:
>> www.members.re-wrenches.org
>>
>> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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Re: [RE-wrenches] automatic transfer switches

2019-11-25 Thread Jerry Shafer 
There is the SMA Automatic transfer switch if you go with the SMA battery
inverter and SMA pv inverter, it can be located seperate of the battery and
inverter and will take up to 30 kwhrs. of capacity
Just a thought

On Mon, Nov 25, 2019, 10:52 PM Bill Hennessy  wrote:

> hi folks--
>
> We're installing a grid-tied, battery backup system on a farm where the
> service entrance is on a pole in the yard. At the single-phase, 240v,
> service entrance, there are two main breaker subpanels--one going to the
> house and one to the barn. The buildings are each about 100 feet away from
> the pole in opposite directions. The PV/battery system is located in the
> barn. When utility power is lost and the battery backup kicks in, we are
> looking for a way to bypass the house subpanel at the pole so it won't
> backfeed the grid.
>
> When the grid drops out, we need to tie the backup power coming from the
> barn to the line going to the house. We're thinking an automatic transfer
> switch installed at the pole will do the job, but the transfer switches
> seem to have built in delays to work with starting a generator. The
> switch does not have to be service entrance rated.
>
> It looks like the Asco 300 series has time delay adjustments, but it is
> pricey and has a seven-week lead time. (Thank-you PG)
>
> The battery backup system will switch over in milliseconds and we were
> hoping to find something similar for the transfer operation at the pole.  
> We're
> looking for something simple--hopefully a basic transfer switch that will
> quickly switch and drop out when grid power is restored.
>
> Would appreciate any thoughts or suggestions.
>
> regards, bill
>
> Bill Hennessy
> Berks Solar, LLC
> 371 Centennial Rd
> Mertztown, PA 19539
>
> o 610 682 4300
> c 484 560 4666
> NABCEP certified installer
> PA contractor #44411
> www.berkssolar.com
> ___
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches@lists.re-wrenches.org
>
> Change listserver email address & settings:
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>
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