T-Pain Is On A Boat: Re: [Electric Boats] battery issue

Tuesday, June 21, 2011

Re: [Electric Boats] battery issue

Great info Arby! Thanks.

--- On Mon, 6/20/11, Arby bernt <arbybernt@yahoo.com> wrote:

From: Arby bernt <arbybernt@yahoo.com>
Subject: Re: [Electric Boats] battery issue
To: electricboats@yahoogroups.com
Date: Monday, June 20, 2011, 2:40 PM

Every E-Boater should have some schedule to check out connections. The proceedure is simple. At the dock, run up the throttle to pull continuous high current through the battery string. Using a volt meter, measure the drop across adjacent batteries. It's normal to have 0.05 volts loss at a battery connection. Over 0.100 volt drop at the interconnect will cause some heating issues. Find one with a 1v drop and you'll need to remedy the condition at once. Running the motor under load stresses the connection to produce a measurable result an Ohm meter would not be able to detect. The resistance of the leads of the meter are higher than the values being tested for. Please consider wearing safety glasses, as a loose connection jarred during testing can create a spark. Vent your battery enclosure after charging to release any hydrogen gas before testing.

Arby

AMeP

--- On Sat, 6/18/11, Mike <biankablog@verizon.net> wrote:

From: Mike <biankablog@verizon.net>
Subject: Re: [Electric Boats] battery issue
To: electricboats@yahoogroups.com
Date: Saturday, June 18, 2011, 6:39 AM

Mark:

On a closer reading I see you cleaned the battery contacts. I was thinking are you sure you replaced the jumpers back on the SAME batteries? Perhaps the jumper was moved to battery four and that's why that battery now shows a failing battery. I would also recheck the connections to the battery. A poor connection in the jumper might also cause it to heat up.

Capt. Mike

http://biankablog.blogspot.com

--- On Sat, 6/18/11, acsarfkram <acsarfkram@yahoo.com> wrote:

From: acsarfkram <acsarfkram@yahoo.com>
Subject: [Electric Boats] battery issue
To: electricboats@yahoogroups.com
Date: Saturday, June 18, 2011, 3:12 AM

My PakTrakr warned of a failing battery, battery #2. Under load of 40-50 amps #2 was running in the low 11 volts. I cleaned up the contacts (and found a loose connection between #2 and #3!!)and the alert went away. Then I ran the motor at 30 or so amps for five minutes and got an Alert on the #4 battery. The reading under load was again in the low 11 volts but on the #4 battery. The #2 battery is now right with the other batteries, in the upper 12 volt range. The jumper wire from #4 to #3 is getting warm while all the other jumpers are cool.

I'm preparing for a bad battery but curious about the migration of PakTrakr Alert.

Any thoughts?

Four group 27 AGMs for a 48 volt bank

Mark
Santa Cruz