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Author Topic:   Engine Starting Current
cosmo posted 04-03-2006 12:09 PM ET (US)   Profile for cosmo   Send Email to cosmo  
After searching and reading posts for a couple of hours, here is some info that might help someone. I to have moved my battery to the console on my Montauk and had to decide on cable size and battery CCA-rating for my 2005 E-TEC 90-HP. Using a Fluke 36 clamp meter at the battery, I measured 460-amp peak (locked rotor) and about 155-amp sustained cranking for three to four seconds at 60°F. I used 20-feet (10 x 2) of 2/0-AWG tinned marine cable and 6-feet (3 x 2) 4-AWG tinned cable to get into the cowling. At colder temperature that peak current draw might well be into the 600 to 700-amp range. It's easy to see why it is best to have the battery close to the motor and cables as short as possible. But due to the kicker, battery and body weight aft, I would take water over the splash well hence the move.
jimh posted 04-03-2006 11:16 PM ET (US)     Profile for jimh  Send Email to jimh     
Thanks for the information on the measurement of starting current. I have been thinking about getting a clamp-on ammeter such as the FLUKE-336. It sounds like a good instrument for taking measurements like this.
jimh posted 04-03-2006 11:18 PM ET (US)     Profile for jimh  Send Email to jimh     
[Moved to SMALL BOAT ELECTRICAL.]

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