Forward from non-member Julie Haugh:
- - - - -
Hugh Piggot writes:
According to Peukert's law (and manufacturers' data bears this out
well) the capacity of a battery depends on the rate of discharge.
Everyone who knows anything about batteries knows that the capacity
is specified at a
From Julie Haugh
Your assessment is correct; you can't store kilowatts of power, you
*can* store kilowatt hours of energy.
Author Lyn Corum might have slipped up a couple times in there and
dropped an 'h' from the kw, but maybe not -- because when storing energy
on a utility scale, the
Julie explains the correct application of Peukert's Law. However she
does not explain why the battery discharge trials all end at the same
voltage. The SOC of a battery on high current will be much higher
than that of a battery at low current at this chosen voltage.
If the high rate
But you know they keep talking about the potential contribution that plug-in
hybrids might have for storing energy for utility support. Most of our systems
have hugely larger capacity than current Prius'. And I suspect that many RE
system owners will want some backup, especially if they are
So one of our battery systems could be rated in terms of maximum instantaneous
discharge, lets see: 20,000 amps x 48 v is almost a full Mw..
Wow, now I can say I installed over 100 MwI like this new fuzzy
math..
It was such a bummer before to tell the customer looking at a ton of
Julie Haugh writes:
This is part of why there's all the fuss about why renewables are bad
for the electric grid. It's also why, IMHO, battery backed renewables
need to be considered more in the future -- so the regulation
requirements can be met with the RE systems themselves.
I think east-west
Esteemed Wrenches,
We have a PV job in the works that will require mounting racking to
several roofs that consist of asphalt shingles laid over SIP panels.
The panels are standard 10 nominal thickness, with 9-1/4 of foam
sandwiched by 1/2 OSB on each side. The rub is that the underside of
Luke,
Direct Power and Water has an optional mounting foot with five holes in
it for what I think Jeff Randall there referred to as 'Tech' screws to use in
the field between rafters. They are referred to as 'easy feet'. It is designed
to only attach into the roof decking, which I'm
Just a note of caution here: "Tech" screws are "Tek" screws, which are
essentially a sheet metal thread following a pilot drill point, on a
hardened shank. They are intended for mounting only into metal, not
wood; the drill point isn't designed to self-pilot into wood, and the
drill section is
9 matches
Mail list logo
