nuckolls.bob(at)aeroelect
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 Posted: Sun Sep 04, 2011 1:56 pm Post subject: Initial experience with dual Odyssey PC680s powering RV-1 |
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At 03:28 PM 9/4/2011, you wrote:
| Quote: | --> AeroElectric-List message posted by: "Richard E. Tasker" <retasker(at)optonline.net>
Have you measured the voltage at the starter and an adjacent ground point and compared it to the same measurement at the battery terminals, both while cranking?
Possibly you have a bad or loose connection somewhere that is contributing to your hard cranking.
Certainly worth a try (if you haven't already done this) to avoid replacing the battery and battery holder.
Dick Tasker |
Absolutely. These batteries have a DEMONSTRATED ability
to do the job for which you've installed them. You need
DATA on where energy from the batteries is being lost
before it reaches the starter motor.
Unfortunately, the current draw of a starter motor
is so wiggly, it's difficult to get meaningful measurements
on a starter while standing behind a swinging prop. Suggest
you acquire the use of a battery load tester like this
Harbor Freight product
[img]cid:.0[/img]
Unhook the starter feed wire at the starter and put
a bolt through the lug end with a nut to get a good
grip. Clip the red test lead to the bolt (you don't
want an imperfect connection to burn your lug).
Similarly, fabricate a short piece of 4AWG with
a lug-bolt assembly on one end and a lug on the
other suitable for grounding to your engine . . .
preferably the same bolt that attaches the starter.
The voltmeter on this tester reads voltage
right at the test clips . . . so you don't need
to worry about votlage drop in the long fat-wires.
Simulate an engine cranking event while cranking
the load tester up to 200A . . . you should have
9V+
Use the same tester to load each battery until
the voltage drops to 9V. Each battery should
be capable of delivering 9V at 400 amps or more.
Bob . . .
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