If it were me (Depending on how big the back up loads are), I'd make the array direct grid tie, and then set up a smaller stand alone system (At the house) for critical loads back up.. more like a big UPS.. (no DC in)
db
Dan Brown
Foxfire Energy Corp.
Renewable Energy Systems
(802)-483-2564
www.Foxfire-Energy.com
NABCEP #092907-44
-------- Original Message --------
Subject: Re: [RE-wrenches] Invert first?
From: Dan Fink <buckvi...@hughes.net>
Date: Sun, October 02, 2011 12:50 pm
To: RE-wrenches <re-wrenches@lists.re-wrenches.org>
Hi Eric;
I'll be very interested to hear what others on this list who have far
more experience than me in large systems have to say about this.
But my first thought is, go DC. The new Xantrex XW high voltage MPPT
charge controller will take up to 600 Voc from PV and put it into a
standard battery bank, that roughly puts you realistically at just 30
amps in your DC lines.
How were you planning to invert to AC at the PV array? Enphase etc? How
do you do battery backup with an Enphase system (I have no idea, but am
eager to learn from others here)? Any standard islanding grid-tie
inverter will need to be right next to the battery bank.
Dan Fink
Executive Director;
Buckville Energy Consulting
Buckville Publications LLC
NABCEP / IREC / ISPQ accredited Continuing Education Providers
http://www.buckville.com/
i...@buckville.com
970.672.4342 (voicemail)
970.373.1311 (fax)
Eric Thomas wrote:
> Wrenches,
>
> We are designing a super high end grid-tied w/ battery backup system for
> a customer. Array will be ~15kW; pole or stand alone structure mounted;
> 250' from home/batteries. My question is: does it make any sense to
> invert the power at the array and use this ac to make the long run to
> the batteries THEN connect to a typical battery charger rather than a dc
> charge controller? Im mostly concerned with huge dc conductors making
> this run across the property. Havent delved into the specific design
> enough to size said conductors yet, or specify any equipment, but wanted
> to know if im barking up the wrong tree ir not.
> Thanks for the insight.
>
> Eric Thomas
> Founder
> Solar Epiphany LLC
> NABCEP Certified PV Installer
> WA Electrical Contractor # SOLAREL911NR
>
>
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