[RE-wrenches] Back feeding battery inverter with grid-tie inverter

[Chris Schaefer]

Also Robin at Midnight Solar has been promising to come out with a higher
VOC charge controller too. How about it Robin? I'll be needed one for this
spring for use at our Design and Training Center for use in a class. Be
happy to do some Beta testing for you.

Chris Schaefer
Solar and Wind FX Inc.
5115 South Hill Road
Canandaigua(Bristol Center) New York 14424
585.229.2083
Cell 748.1870
chris at solarandwindfx.com
http://www.solarandwindfx.com/
Where Knowledge Equals Power Independence


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-----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of
penobscotsolar at midmaine.com
Sent: 19 January, 2009 06:18
To: jryago at netscape.com; RE-wrenches
Subject: Re: [RE-wrenches] Back feeding battery inverter with grid-tie
inverter

Hi Jeff,
    This isn't an answer to the questions below, but an alternate
suggestion. Apollo Solar has a charge controller which allows for
strings of up to 200 VOC (160 volts nominal) and I believe 100 amps.
Would this not be a simpler, more efficient system?
Just a thought...
Daryl DeJoy
NABCEP Certified PV installer
Penobscot Solar Design




> I know this subject has come up before, but there have been several
> different suggested ways to handle the problem and I was hoping for
> easiest.  We install lots of both on grid and off grid systems.  However,
> we have a client that will require a ground mounted array much futher away
> from the inverter and batteries in the garage than we normally would want
> to do since the voltage drop for this long distance would be excessive at
> low voltage even with large cables.  We have decided to locate a
> weather-proof sunnyboy grid-tie inverter at the array, and supply 120/240
> volts to the critical loads sub-panel which is supplied by a Xanrex XW
> inverter and battery bank in the garage. I realize there are several
> design issues here when the grid is down,  since we want the grid-tie
> inverter to remain on but be blocked from the grid by the Xantrex
> inverter.
>
> The question is, what is the best way to keep a load on the sunnyboy since
> it will not be grid connected during an outage.  Also, is there a best way
> to feed the output from the Sunnyboy to the Xantrex that does not just
> power the sub-panel loads during an outage, but also will re-charge the
> battery bank through the Xanrex?
>
> If you back-feed the Xanrex from the sub-panel it is normally supplying
> with output from the Sunnyboy, will the Xanrex see this input and think
> the grid is up and be able to re-charge the battery bank?
>
> Will we need any separate transfer switches or power relays?
>
> Thanks,
>
> Jeff Yago
>
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