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- Scurvy Dog
- Posts: 12
- Joined: June 8th, 2015, 3:34 pm
- Vessel Info: Carver 404 2000
My AC shore power line was not connected well and my Carver 404 batteries were dead in the morning. Charged them back up and no problems. I thought that only going one night (maybe 18 hours) with no charge didn't seem like that long for the batteries to beable to hold a charge. I don't think there was much pulling on the batteries (maybe fridge, etc) over night that would have drained them.
Battery configuration is 3 batteries - 2 shared for engines and house, the other for generator.
How long will your batteries hold a charge, if there are no demands on them?
- CYO Supporter
- Posts: 2364
- Joined: July 10th, 2015, 9:58 pm
- Vessel Info: 1989 Carver 3807
- Location: Ontario, Canada
- Has thanked: 90 times
- Been thanked: 461 times
Reardon wrote:...How long will your batteries hold a charge, if there are no demands on them?...
The key words here are "no demand." That means no electrical flow, as if they were disconnected. The amount of time they hold a charge and still remain "technically" charged depends on a few variables including battery age and condition, temperature, habits/conditions under use, charge/discharge cycles, etc. As an example, I leave my batteries on board throughout the winter months disconnected. Come Spring time, they are still fully charged.
How long they last with something running depends on the same as above plus the load specs of the items running.
- CYO Supporter
- Posts: 978
- Joined: March 28th, 2016, 10:52 pm
- Vessel Info: 1998 Carver 355
Suspicious Fishes !
1990 Proline 17CC
- Location: upper chesapeake bay
- Has thanked: 71 times
- Been thanked: 199 times
You state you may have had the fridge etc on. In my experience a fridge will drain a regular starting battery in about 8 hours. A deep cycle a bit longer. Also many variables as far as reserve amps, temp, load etc. Just to be safe, I would put a load tester on each battery to make sure they weren't damaged by the full drain down.
- CYO Supporter
- Posts: 259
- Joined: February 16th, 2013, 5:46 pm
- Vessel Info: '99 404 CPMY
my twin diesel pusher
- Location: Kennewick, Wa
- Has thanked: 8 times
- Been thanked: 35 times
You didn't specify what size batteries you have so it's hard to give a good answer. It also depends on how they are connected, one or two banks. Note, if two banks never use the 'BOTH' setting on the selector switch unless you cannot start the engines from one bank. The Norcold refr draws about 4 amps from the batteries so that would be ~70 amp hours over an 18 hour period. Guessing at a pair of group 31 bats w/120 amphours each you should have had enough reserve to start an engine. Remember usable battery reserve is half the listed amp hour rating. I have two group 31 bats in parallel for starting and 4 6v golf cart bats connected series/parallel for the house plus another group 31 for the genny.
- First Mate
- Posts: 178
- Joined: January 5th, 2016, 10:02 am
- Vessel Info: Carver 3227 Sedan Convertible
1986 - 260 Mercruisers - Kohler 5E
- Location: Lake Norman, NC
- Has thanked: 19 times
- Been thanked: 50 times
Past Commodore, Peninsula Yacht Club
Lake Norman, NC
Carver 3227 - "Splashy Lady"
Aquasport 222CCP - "Gone Fission"
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