[RE-wrenches] Invert first?
boB Gudgel
boB at midnitesolar.com
Sun Oct 2 12:00:08 PDT 2011
On 10/2/2011 11:53 AM, dan at 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 <buckville at hughes.net <mailto:buckville at hughes.net>>
> Date: Sun, October 02, 2011 12:50 pm
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org
> <mailto:re-wrenches at 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/
> info at buckville.com <mailto:info at 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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