Hello everyone. This question goes out to the contractors that deal with
rebate structures that use a performance based incentive like the new Xcel
solar rewards program. I am finding it difficult to compute the performance
based incentive (.40 cents per kilowatt hour of production) into the
I believe Roy has a customer with a huge battery bank that air conditioned
the battery room. He ran the numbers and the air conditioning actually made
sense.
Bob Ellison
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of R Ray
Bob is correct, I do have an off grid client that uses an AC unit to
keep the batteries cool.
Although we're not in a high temp climate, it does get into the 80's
and low 90's here
in the summer.
By my calculations, he was losing an 'average' of 10% storage
Have you tried SAM from NREL? Or a custom spreadsheet?
NREL also has a new spreadsheet out for calculating IRR and ROI with PBI's, however it is a bit convoluted (ridiculous number of inputs) and uses a generic kWh calculation instead of a normal modeled output.
Are you trying to calculate a
Hi Roy,
Hi temperatures will hit the battery capacity but
will the battery efficiency be that much
affected? If the battery capacity is inadequate
then you need to compare the aircon running cost
to the cost of buying a 10% larger battery.
Don't you?
Cheers
Hugh
Bob is correct, I do
Hugh,
Correct to a point. But if we added 10% capacity, we would need to
add a bit more
charging capacity (PV/wind) and it begins to spiral up in cost. Much
as I hated to see
that AC unit there, it was still the more cost-effective solution
for that
Roy,
Your post is most puzzling. As temperatures rise above 25C, battery capacity
rises and cycle life is shortened. The opposite is true as temperatures drop
below 25C. What do you mean by he was loosing capacity during summer months?
My question is whether anyone has run air conditioning on
Re: [RE-wrenches] Air conditioning for batteries in highIt's the efficiency
of the chemical reaction that creates the loss. The electrolyte solution
cannot pull out nor put back the same amount of 'energy' in hotter or colder
conditions. When temperatures moderate, the chemical reaction returns to
Re: [RE-wrenches] Air conditioning for batteries in highPartially right, Jim.
Except hotter internal temperatures cause the electro-chemical process to be
faster, not slower. Only as temperatures decrease below 25C, which may vary
with manufacturer, is the process slowed.
Larry
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Wrenches,
We have been asked to quote a largenumber ofinstalls on comp shingle roofsfor an individualowner who requires Oatey flashing's with a 3" standoff on all installations.
For the past2 years we have installed the QuickmountPV product on comp shingle roofs and are use to the labor rate
Jamie,
You did not ask, but I am offering:
I find the Oatey flashing with the elastomeric boot to be a somewhat suspect
product. I know, I knowyou see them everywhere on the finest tract
homesbut
My everlasting image is of 6 or 7 of them peeping out below the last row of
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