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william.p.dube(at)noaa.go
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 Posted: Tue Mar 07, 2006 3:51 pm Post subject: Battery choices (was: Battery cranking power, Plus starter c |
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The 14 A-hr SVR motorcycle battery is probably a better choice.
http://www.svrbatteries.com/battery_page.php?bid=1&vid=-1
This battery has an internal resistance of about 6 milli-ohms. It only
weighs 11.5 lbs.
I have pulled over 850 amps out of these on my electric drag bike.
http://www.killacycle.com
Bill Dube'
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I've been running small Panasonic batteries for about four years. Here
are the details:
1) O-320, carbed with two mags
2) AeroShell W100 (50wt)
3) Engine continuously preheated with sump heater Dec-Feb.
4) Insulated hangar in north Alabama
5) Skytec starter, but don't recall the model or type
6) Short battery cables
The small battery was installed as a replacement for the original
Concord. I wanted to move the battery forward of the firewall and also
incorporate 'Lectric Bob's method of replacing a cheap battery every
couple of years. The Concord was still working fine after three years in
service, matter of fact it filled in nicely for a friend last year who
had a battery die unexpectedly.
The Panasonic has worked well in my situation. The only time it failed
me was once on a January morning (~20F) when I managed to get the engine
flooded during engine start (no primer) and the battery gave it up after
several attempts to crank the plane.
In my opinion, the Panasonic battery is a viable option for conditions
similar to mine. If there is a need to routinely start a chilled engine
with electronic ignition and a high-current starter, the cheap battery
probably isn't a good choice. An Odyssey would no doubt give more
reliable service under those conditions.
When I first installed a Panasonic in my RV-6, there was quite a wide
difference in the cost of it and an Odyssey. But since the Odyssey
prices have fallen in the past few years, the rational for the Panasonic
isn't as strong as it once was. Even though I have gotten good service
from the cheap batteries, I may consider an Odyssey next time.
Details of my installation:
http://thervjournal.com/battery.htm
Sam Buchanan
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Hopperdhh(at)aol.com
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| Posted: Tue Mar 07, 2006 4:16 pm Post subject: Battery choices (was: Battery cranking power, Plus starter c |
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Bill,
Wow! But 850 amps at about 6 volts (at 746 watts per horsepower) only comes
out to 6.8 horsepower per battery. How many are you using? 10? 20? Or, is
it a closely guarded secret?
So far, so good with Odyssey and PM starter. I'm amazed at its cranking
power. Have had one whump, but that was quite a while ago.
Dan Hopper
RV-7A 200 hp Flying 144 hrs.
In a message dated 3/7/2006 6:53:53 P.M. Eastern Standard Time,
william.p.dube(at)noaa.gov writes:
I have pulled over 850 amps out of these on my electric drag bike.
http://www.killacycle.com
Bill Dube'
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