gmcjetpilot(at)yahoo.com
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 Posted: Sun Mar 26, 2006 1:41 am Post subject: Battery Cranking Power (Good Info on wiring Battery/Starter! |
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Dear David:
per Sky Tec's info, their PM starter current draw is approx 320 AMPS!
Reference this source: http://www.skytecair.com/Wiring_Experimental.pdf
This document has good info on wiring the starter.
Cheers George
From: "DAVID REEL" <dreel(at)cox.net>
Subject: Battery Cranking Power
I took some measurements today because my Panasonic LCRD1217P battery
cranking power seems marginal on cold, 45 degree, days with my O360A1A and
SkyTek permanent magnet starter. I saw 5.5 to 6.5v from the starter side of the
starter relay to a stud on the vacuum pad of the engine accessory case. I also saw
5.5 to 6.5 v from the battery + terminal to airframe ground.
The battery was fully charged and measured 12.8v and was new. Assuming the
battery - terminal to airframe ground connection is good, it's new, and that about 200a
is being drawn by the starter, this gives a 25 milliohm internal battery resistance to
explain the 6 volt drop on starting. The specs claim the battery has 12 milliohm
resistance at 77 degrees. Would the 30 degree temperature drop be enough to
reasonably explain this big increase in internal resistance? Could the starter be
taking 400a? When the starter would stall, the battery voltage dropped to about 4.5v.
Dave Reel - RV8A
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