The GENTRAN sounds very interesting. The Internet has some for sale,
but so far no detail. Will the 12 circuit panel shed one circuit at
a time? In a nutshell, how does this work?
Thanks,
Drake
At 02:32 AM 11/10/2011, you wrote:
Hi Wrenchies,
Yes and if you use a GENTRAN or
-wrenches@lists.re-wrenches.org
Sent: Thursday, November 10, 2011 1:32 AM
Subject: Re: [RE-wrenches] High Voltage MPPT units; Adding battery backup
Hi Wrenchies,
Yes and if you use a
GENTRAN or equivalent circuit-by-circuit transfer switch add-on for the
output from the offgrid inverter to your
Any amount of power will AC couple.
If you use an off grid inverter, such as an
Outback, to feed the protected load panel, the
inverter should be fed by grid AC power to supply
loads, when the grid is available. Just
feed your grid tie inverter into the protected
loads panel. You will
Right a major rewire and many components...and sacrifices. The Outback is
limited to 30 amps AC and cost much more than you would need to spend.
With my idea you just add a transfer switchDone. When the grid is down, PV
feeds HV CC. Then you can use ANY size inverter, with or without a
I googled 600 volt switch dual throw and found a cutler-hammer DT363URK.
From
http://www.alliedelec.com/Images/Products/Datasheets/BM/EATON_CUTLER_HAMMER/416-0447.PDF
Not sure if it carries a DC rating all the way to 600v.
Thank you,
Maverick
Maverick Brown
BSEET, NABCEP Certified
Subject: Re: [RE-wrenches] High Voltage MPPT units; Adding battery backup
I googled 600 volt switch dual throw and found a cutler-hammer DT363URK.
From http://www.alliedelec.com/Images/Products/Datasheets/BM/EATON_CUTLER_HAMMER/416-0447.PDF
Not sure if it carries a DC rating all the way to 600v
Hi Wrenchies,
Yes and if you use a GENTRAN or equivalent circuit-by-circuit transfer
switch add-on for the output from the offgrid inverter to your AC panel
- then there is no need for a separate dedicated AC loads panel and
rewire like in Larry's original drawing. I've used this trick for
I may be missing something here.. but, for a manual switching solution, why
not use two standard 600V DC discos. Put the PV to the top of both, load side of
one goes to the battery inverter, load side of the other to the grid tied
inverter. Turn one off, turn the other one on. Not as elegant
, Starlight Solar Power Systems la...@starlightsolar.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Sent: Tuesday, November 8, 2011 9:18 AM
Subject: Re: [RE-wrenches] High Voltage MPPT units
Dick,
I had that thought as well but it leaves open the possibility of paralleling
the grid inverter
] On Behalf Of Darryl Thayer
Sent: Tuesday, November 08, 2011 7:22 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] High Voltage MPPT units
Caution!!! if you parallel the imput of both the inverter and terh charge
controller one or the other will be destroyed. ASk BoB if you parallel on teh
input
Hi Glen,
That model is a disconnect switch. What the system needs is a 4 pole transfer
switch, automatic or manual, to connect the PV source to the charge controller.
Hello Gary Willit,
Yes, you've grasped my concept precisely and I agree, getting a high voltage DC
transfer switch may nix
Just curious, what's the advantage of switching at the array vs. just
using a Sunny Island or Outback system? Seems this would cost more, and
have less efficiency, since you would still have the battery float
losses, backup inverter idle losses, in addition to the 2nd grid tie
inverter losses.
Ray,
Yes, the idea was for a low cost way to add battery backup to existing high
voltage PV grid tie systems, not new construction.
The second inverter does not need to be able to sell since that is handled by
the grid tie inverter. It simple passes grid power to loads and maintains the
Could you use the old Dankoff trick of running through 2 poles in series of a
300 v rated switch? That used to be approved, before we had all these 600 v
rated equipment.
R. Walters
r...@solarray.com
Solar Engineer
On Nov 7, 2011, at 1:16 PM, Larry Crutcher, Starlight Solar Power Systems
On 11/7/2011 11:15 AM, Larry Crutcher, Starlight Solar Power Systems wrote:
Hi Glen,
That model is a disconnect switch. What the system needs is a 4 pole
transfer switch, automatic or manual, to connect the PV source to the
charge controller.
Hello Gary Willit,
Yes, you've grasped my concept
With 4800 watts and HV input, it seems to me that a simple battery backup can be formed from an existing PV grid tie system. Block diagram attached. Where can one find a 600 volt rated DC transfer switch?Larry
Original Message
Subject: Re: [RE-wrenches] High Voltage MPPT units
: Re: [RE-wrenches] High Voltage MPPT units
With 4800 watts and HV input, it seems to me that a simple battery backup can
be formed from an existing PV grid tie system. Block diagram attached. Where
can one find a 600 volt rated DC transfer switch?
Larry
Original Message
From: la...@starlightsolar.com la...@starlightsolar.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Sent: Sunday, November 6, 2011 1:45 PM
Subject: Re: [RE-wrenches] High Voltage MPPT units
With 4800 watts and HV input, it seems to me that a simple battery backup can
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