Airplane Batteries

Jim Weir published this a few years ago. I just finished (cobbled
together) one & am trying it out. Note that it has to be on the
battery for weeks & that the average current is like a trickle charger.
I had a couple of the output IGBTs fail though I'm pushing the supply
voltage. Go here for details:

http://www.rst-engr.com/kitplanes/KP0204/KP0204.htm

nrp wrote:
Jim Weir published this a few years ago. I just finished (cobbled
together) one & am trying it out. Note that it has to be on the
battery for weeks & that the average current is like a trickle charger.

So. What would you have to change to use this on a 6-volt car battery?

George Patterson
Coffee is only a way of stealing time that should by rights belong to
your slightly older self.

Nothing. It isn't sensitive to battery voltage, as it is a 50 V power
supply that connects for only about 10 microseconds, 70 times per
second. It hits the battery pretty hard as the current spike is maybe
10 Amps & the sparks fly a little when it is connected up. The average
current however is only a few milliamps. Don't connect or disconnect
it under load. I wiped out a couple of the hexfets (they're not IGBTs)
getting it going. It's an interesting project. I wish Jim W had
pursued it more & offered it as a kit.

Do you have a motorcycle battery to keep up?

I hate when that happens.

"nrp" wrote in message
oups.com...
I wiped out a couple of the hexfets (they're not IGBTs)
getting it going.

Which is why I never put it out as a kit ... "I want warranty replacements;
these lousy fets you sent me in the kit are no damned good."


"Michael Ware" wrote in message
. ..
I hate when that happens.

"nrp" wrote in message
oups.com...
I wiped out a couple of the hexfets (they're not IGBTs)
getting it going.

You could have just sold the circuit board. Or could the lawyers
figure out a way to nail you on those too?

OK, I've got a question for all of you.

I have always heard that if you have a battery out of the (whatever) vehicle
for the winter, or while it is the shop, if you sit the battery on a
concrete floor, that will kill the battery, possibly for good.

If this is true, why?
--
Jim in NC

I believe it's false.

"Morgans" wrote in message
...
OK, I've got a question for all of you.

I have always heard that if you have a battery out of the (whatever)
vehicle for the winter, or while it is the shop, if you sit the battery on
a concrete floor, that will kill the battery, possibly for good.

If this is true, why?
--
Jim in NC

"Morgans" wrote in message ...
OK, I've got a question for all of you.

I have always heard that if you have a battery out of the (whatever) vehicle for the winter, or while it is the
shop, if you sit the battery on a concrete floor, that will kill the battery, possibly for good.

If this is true, why?
--
Jim in NC

Try this link:

http://www.ibsa.com/www_2001/content...9_techtalk.htm



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Morgans" wrote:
I have always heard that if you have a battery out of the (whatever)
vehicle for the winter, or while it is the shop, if you sit the battery on
a concrete floor, that will kill the battery, possibly for good.

If this is true, why?

on Woellhaf wrote:
I believe it's false.

My mechanic said it is absolutely true, and said to always put a piece
of wood or thick cardboard down first if you have to set it down on a
concrete floor for any length of time.