flooded v. sealed batteries [RE-wrenches]

[Matt Tritt]

Allan,

I suspect you're correct judging from my own experiences. My bet would
be that about 1 out of 4 systems employ sealed batteries, and those tend
to be on the small side to boot. A more accurate way of judging battery
useage would have been to actually contact all the known system
installers and get their input.

Matt T

-----Original Message-----
From: Allan Sindelar [mailto:allan at positiveenergysolar.com] 
Sent: Monday, September 29, 2003 9:06 AM
To: RE-wrenches at topica.com
Subject: Re: flooded v. sealed batteries [RE-wrenches]


Joel,
I didn't wade through Hammond's paper, but Hund's work was fundamentally
flawed. He published a report that concluded sealed batteries were more
common in PV systems than flooded. When I questioned this (years ago) I
learned that he based his study on a survey of PV system
integrators/distributors. They had shipped far more sealed batts than
flooded. But look closer: sealed batteries can be shipped. Flooded
can't. So we get flooded batts from battery distributors with delivery
trucks. They didn't show up on the survey.

Since Hammond's report starts out with a similar survey of large system
integrators, the same flawed conclusions may have resulted.

Allan at Positive Energy

----- Original Message ----- 
From: "Joel Davidson" <joeldavidson at earthlink.net>
To: <RE-wrenches at topica.com>
>
> Bob Hammond's battery survey at
http://www.sandia.gov/pv/docs/PDF/IEEE2.pdf is a
> little dated but shows what batteries U.S. PV integrators were buying 
> and selling.

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