this is a 240 volt transfer switch and also shown is a 600 volt safety switch
single pole single throw
________________________________
From: "maver...@mavericksolar.com" <maver...@mavericksolar.com>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Sent: Wednesday, November 9, 2011 9:55 PM
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.
Thank you,
Maverick
Maverick Brown
BSEET, NABCEP Certified Solar PV Installer ®
President & CEO
Maverick Solar Enterprises, Inc.
Office: 512-919-4493
Cell: 512-460-9825
Sent from my HondaJet!
On Nov 9, 2011, at 6:07 PM, "Larry Crutcher,Starlight Solar Power Systems"
<la...@starlightsolar.com> wrote:
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 switch....Done. When the grid is down, PV
>feeds HV CC. Then you can use ANY size inverter, with or without a transfer
>switch. No rewiring the grid inverter. No 240 volt transformers or dual
>inverters. No relays, switches or diversion controllers. Batteries are always
>properly maintained. No phantom loads. Very simple.
>
>Thanks for your input. Now if I can just find that darn 600 volt transfer
>switch.
>
>Larry Crutcher
>Starlight Solar Power Systems
>
>
>
>On Nov 9, 2011, at 1:55 PM, Drake wrote:
>
>
>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 need a relay to shut off power from the grid tie
>inverter when the batteries are full. This can be triggered by the fan relay
>in the Outback.
>>
>
>>
>The on grid inverter will push power into the grid through the battery
>inverter's internal transfer switch during normal operation and AC couple when
>the power is out. If your grid tie inverter is 240 volts, you will need to
>use a transformer or two inverters.
>>
>
>>
>The phantom load of the inverter can be eliminated by using a transfer switch
>to send PV power straight to the grid, during normal grid availability,
>keeping the inverter turned off. AC coupling seems much easier than using a
>charge controller, but there is no conditioning of the batteries. The charge
>is just on and off at the voltage set point. For a back up system, that is not
>much of a problem, as the battery inverter can maintain the batteries when
>power is available.
>>
>
>>
>
>>
>
>>
>At 02:04 PM 11/9/2011, you wrote:
>>
>Nice Find, Drake! Thanks.
>>>
>
>>>
>What is the minimum system for an AC coupled inverter?
>>>
>
>>>
>Again, the idea is for low cost battery backup of an existing grid tie. The AC
>coupled schematics I have looked at require a major rewire and many
>components. I would like to hear if someone has a simple add on solution
>compared to just switching the array to the high voltage CC.
>>>
>
>>>
>Larry Crutcher
>>>
>Starlight Solar Power Systems
>>>_______________________________________________
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