Cell Temp and Standoff WAS:More Million Dollar Roofs [RE-wrenches]

[Bill Loesch, Saint Louis Solar]

Jim Hartley said:
>I forgot to mention one other thing.  Roofs get VERY hot.  This  location,
therefore, results in solar cell operating temperatures rising  markedly,
causing power loss.  What's that worth in $$$. Any guesses?  I would think
modules placed in free air are more cost  effective.

Jim Hartley http://www.homestead-specialties.com Business Email:
JamesHartley at homestead-specialties.com Direct Email: grail at inil.com<

On a slightly smaller note, has any one had any experience with the Siemens
SP10 using the flanged module frame as the sole standoff? There is about a
half inch between the "roof" and the back side of the EVA. No standoffs are
_exactly_ how their SP10 kits are delivered. On the larger module sizes
they use Z brackets for these mobile kits. FWIW, they squeeze 17.4 VPM(?)
volts out of the little guy while the SP75 still has a 17.0 rated label. Is
this some new rating game I forgot to tune into?

Perhaps this is a reversion to the "self regulating modules" of earlier
times? If your boat , RV, van, service body etc. roof is hot then the
battery doesn't get overcharged during the longer summer days?

Bill Loesch
bill_loesch at compuserve.com
tel / fax 314 631 1094
Solar 1 / St Louis Solar
9905 Vasel Drive
St Louis MO 63123-4321



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