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ID: 261 Title: What Size Batteries & Alternator? Replis: 5 Read: 3708 Author: 6  Page:[1]  2  
Name: Texbob  Posts: 2    Vancouver Time: 2005-4-19_9:0:55 Quote    Reply
I'm buying a 32' boat that currently has two old 92 amp/hr batteries. I calculate my daily needs to be approx. 100 amp/hrs. What size batteries are recomended? If I increase the size of the batteries must I also upgrade the alternator? Thanks for you help
Name: ilyas  Posts: 1    Vancouver Time: 2005-4-20_10:2:32 Quote    Reply
hello! my name is ilyas .Im a electrician.so ..size no problem.battery every time need 12 volt or 24 volt if your battery place big you.r possible put there 2pcs parallel or 1 pcs battery 210amper/hr(marin type) if full never problem. good lucky..ilyas
Name: John  Posts: 2    Vancouver Time: 2005-8-19_7:29:8 Quote    Reply
Battery bank size will affect how long you can go before having to recharge. Generally, most cruisers recharge when the batteries get to about 50%. So, you would need to recharge at least once a day with the conditions you describe. The size of the alternator will determine how fast you can recharge (up to a point) Gel and AGM batteries will accept more amps, but regular wet cells can be recharged at about 1/4 their capacity. In other words, a 200 amp-hour bank could use a 50 amp alternator, and a larger one wouldn't do much good if you have wet cell batteries.
Name: Lee  Posts: 4  **  Vancouver Time: 2005-9-3_5:27:55 Quote    Reply
The best capacity/$$ is from 6V Golf Cart batteries, about $45 ea at Sam's Club. You also need to purchase jumper wires to combine batts in series, don't buy these at Sams, get much heavier guage. I use about same power and have 6 golf Cart batts, but 4 would do. I use 1/0 size cables (one-ought). Highly recommend battery monitor that shows amp hours used. Lee
Name: Bucephalus  Posts: 1    Vancouver Time: 2005-9-5_18:11:29 Quote    Reply
I have a 36 footer with 400 amp/hour capacity (wet cell). I use a 120 amp alternator. For recharging, I never let the batteries drain to more than 60% of a full charge. Your battery bank needs to be sized per your electrical requirements and how often you want to recharge. Have you considered solar or wind generators?
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