Quoting Lee Hart via EV <[email protected]>:
Robert Bruninga via EV wrote:
wouldn't it be just as easy to insulate the battery and
provide a small electrical heat source. 100W or so?
Lets say a 1000 lB battery. It takes 1 BTU to raise one pound one degree.
To raise 1000 lbs say 40 degrees from 0F to 40F would take 40,000 BTU or
about 11 kWh. Or about 33 miles of range given up to heat the battery.
True enough if you're warming up a cold battery. But it would be
foolish to heat the battery with its own charge.
I agree, that is why here at J&R Housing in 2010, we built a 26x80
building aimed at this problem. It has *heat in the floor* from a
central *Froling, wood fired boiler*. The electrical service is at
the center with 2-200 amp panels to serve the 6 stalls. At that
time, we installed 2 ClipperCreek wall connectors, a CS40 and a
CS100. Being next to a new high school, we envisioned potential EV
parking demand. So far, that has not happened. We have since added
more floor heated garages and ClipperCreek CS 100 units to some of
our other rental units.
I am pleased to say that we are charging our new Tesla Model 3 from
the CS100 in one of the stalls. IMHO, the thermal mass of the floor
will also be beneficial in the summer as the battery draw in the
parked car keeps it at the optimal temperature.
Instead, you would use AC mains power to heat it. In that case,
you'd be charging the pack at the same time. So heating the battery
from a cold start just adds to the charging time. When the charge
cycle finishes, you have a fully-charged, fully warmed up battery;
so no loss of range.
The battery pack has so much thermal mass that if it is well
insulated, it will stay warm all day, without any supplemental
heating. Wait until the next time it's plugged in to warm it back up.
--
In software development, there are two kinds of error: Conceptual
errors, implementation errors, and off-by-one errors. (anonymous)
--
Lee Hart, 814 8th Ave N, Sartell MN 56377, www.sunrise-ev.com[1]
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Links:
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[1] http://www.sunrise-ev.com
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