On 10/2/2011 11:53 AM, d...@foxfire-energy.com wrote:
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 loadsback 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 <http://www.Foxfire-Energy.com>
NABCEP #092907-44
You could also think about using 2 transformers, one on each end, to
boost the AC to a few thousand volts to
cut losses. But transformers have losses too. Might be able to use
some type of AC coupling as well for
the backup part ??
boB
-------- Original Message --------
Subject: Re: [RE-wrenches] Invert first?
From: Dan Fink <buckvi...@hughes.net <mailto:buckvi...@hughes.net>>
Date: Sun, October 02, 2011 12:50 pm
To: RE-wrenches <re-wrenches@lists.re-wrenches.org
<mailto: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 <mailto: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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