Fritz,

In my humble opinion 15.5VDC is too high a voltage. Does your charge
circuit have a voltage regulator or is the output going straight into the
battery without a voltage regulator?

Depending on the horsepower of your outboard, 10 amps seems like a lot of
power going to the battery. It would probably be nice if you could control
the charge current to divert power from the engine to propulsion instead of
charging the battery, if desired.

Best Regards,

Bert

Bert van den Berg
CruzPro Ltd.
www.cruzpro.com
35 Keeling Road, #A4
Henderson 1008
New Zealand
Tel: 64-9-838-3331
Fax: 64-9-838-3332




----- Original Message -----
From: "gaffcat"
Newsgroups: rec.boats.electronics
Sent: Tuesday, August 09, 2005 5:51 PM
Subject: outboard battery charging


I am building a boat and recently started my new Yamaha outboard for
the first time. While the engine was running I measured the voltage at
the battery and the reading was 15.5 volts. I have a 100 amp hour AGM
starting battery and the battery manufacturer reccommends a bulk charge
voltage of between 14.1 and 14.5 volts. Is there a way to reduce the
outboards charging voltage? Will this damage the battery? I think the
outboard puts out about 10 amps.

fritz


"gaffcat" wrote in message
oups.com...
I am building a boat and recently started my new Yamaha outboard for
the first time. While the engine was running I measured the voltage at
the battery and the reading was 15.5 volts. I have a 100 amp hour AGM
starting battery and the battery manufacturer reccommends a bulk charge
voltage of between 14.1 and 14.5 volts. Is there a way to reduce the
outboards charging voltage? Will this damage the battery? I think the
outboard puts out about 10 amps.

fritz