flooded v. sealed batteries [RE-wrenches]

[Joel Davidson]

One way to find out if the survey is flawed is to survey more installers. The
small companies will generally share info but the big companies do not want to
disclose their sales volume (or lack thereof).

Allan Sindelar wrote:

> 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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