Down-sizing battery systems [RE-wrenches]

[Jay Peltz, Peltz Power]

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Hi Doug,

Many thanks.

Those are the numbers I've heard so thanks for the confirmation.

Yep I count myself pretty lucky to understand the battery side of  
things.

Hard to believe I'm an old timer!

peace,

jay


On Jan 31, 2008, at 7:07 PM, Doug Pratt wrote:

>
> 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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