Down-sizing battery systems [RE-wrenches]
Doug Pratt
dmpratt at sbcglobal.net
Thu Jan 31 19:07:55 PST 2008
Hi Jay,
I'd estimate that 95%+ of grid-tie systems going in now are direct grid-tie.
Us old guys who still understand batteries are getting rare!
Doug Pratt
DC Power Systems
-----Original Message-----
From: Jay Peltz, Peltz Power [mailto:jay at asis.com]
Sent: Thursday, January 31, 2008 6:33 PM
To: RE-wrenches at topica.com
Subject: Re: Down-sizing battery systems [RE-wrenches]
Hi Doug,
You mention that 98% of systems are now grid-tied.
Can you say what the percentage of these are batteryless?
thanks,
jay
peltz power
On Jan 27, 2008, at 4:53 PM, Doug Pratt wrote:
>
> No doubt about it, battery packs are getting smaller. Mostly
> because 98% of systems are grid-tied now, and for those few that
> elect to go with battery backup, 4 to 8 hours of runtime is fine.
> For the off-grid systems, as Jeff has noted, electrical loads have
> increased, plus, battery costs have skyrocketed, and where I used
> to always aim for 4-5 days of storage (@ 60% DOD), costs are often
> forcing me down to 2.5-3 days. I warn dealers that this is going to
> impact battery life expectancy, but it's a tough sell for dealers
> who do a battery-based system once every year or two, and really
> don't understand batteries at all. Hey, but on the other hand,
> generators are getting better, and cheaper, so maybe this isn't
> such a bad thing.
>
> Cheers,
> Doug Pratt
> DC Power Systems
>
>
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