BAC Forum

General Boards => Technical Support => Topic started by: Dave Parks on March 10, 2013, 02:21:44 PM

Title: Engine Battery
Post by: Dave Parks on March 10, 2013, 02:21:44 PM

What are the specs (capacity, size ?) needed to replace the engine batteries - 2006 Beaver Monterey C-9?  Thx.  Dave

Title: Re: Engine Battery
Post by: Edward Buker on March 10, 2013, 07:52:27 PM

Take some measuremenst and you can verify online what it is. Most likely a Group 31.

Later Ed

Title: Re: Engine Battery
Post by: Craig Rollins on March 10, 2013, 09:02:32 PM

The manual for our 2005 Monterey with the CAT C9 engine states 2 each Group 31P-MHD 12 Volt batteries connected in parallel at 950 Cold Cranking Amps.

Title: Re: Engine Battery
Post by: Joel Ashley on March 11, 2013, 12:01:21 AM

Ditto for our '06 Monterey as what Craig reports.  Reserve capacity 195 minutes at 25 amps at 80 degrees F.  That and the 950 CCA are the minimum;  larger specs are acceptable.

Our original batteries are still good, but in checking my stats for you, I see we have a 140 amp alternator where I thought it was a 160.  All the more reason to make sure you use the genset to recharge things before leaving a dry camp;  driving off and overtaxing the alternator following an extended dry camp is the fastest way to ruin it.

Joel