Feds Want to Equipe Gliders With Transponders and Radios

"Alan" wrote in message
...
In article "Morgans"
writes:

"Eric Greenwell" wrote
This corresponds with the Powersonic chart, so at -10C (15F), you have a
30%
loss of capacity. For winter flying, and spring or fall flying in places
where
you can climb to, say, 10,000' agl, it's an important factor. Especially
so,
when you know your encoder will likely be using it's heater, adding
50-150
milliamps to your current drain.

Put a insulated cover around the battery, and the heat of discharge will
keep
it warm and the capacity up, unless it is seriously freakin' cold.

With a resistance of a few milliohms, a 1 amp discharge will only give a
few milliwatts of heat. I really doubt the battery will keep itself warm.
(After all warming the battery would consume energy from its stored
capacity.)

Alan

The greater problem might be a need to remove the problem during charging,
when a lot more heat is likely to be generated.

Peter

On Sun, 04 May 2008 09:37:13 -0400, Peter Dohm wrote:


The greater problem might be a need to remove the problem during charging,
when a lot more heat is likely to be generated.

I use an automatic charger with bulk charge and float modes.
This unit is designed for 12v batteries in the 6-15Ah capacity range.
It outputs 14.7v at 1.5 amps in bulk mode. My batteries never even get
warm to the touch when on charge.

I'd suggest that if your batteries get hot on charge then there are only
three possibilities:

- you're using a fixed-rate charger with far too high a rate for
the battery.
- you're overcharging with a fixed-rate changer.
- your automatic charger is faulty.


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martin@ | Martin Gregorie
gregorie. |
org | Zappa fan & glider pilot