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Battery heresy
Calder points out how battery life is increased by minimizing
discharge level. No matter how many batteries you have in the boat, you'll get maximum life by putting them in one bank. Keeping a starting battery isolated and in reserve is obviously a necessary compromise for most craft. However, with a 20 hp diesel, modest starting loads, and the ability to hand start, I'm thinking that the simplicity of a one bank system might make sense for a daysailing, short cruise boat, that is docked with shore power. If the batteries did get run down away from home, I'd be willing to hand start in penance. The key question is whether a two cylinder diesel like a 20 hp Yanmar 2QM can really be hand started or if it is an "only when your life absolutely depends on it" kind of operation. I don't have much experience with engines under 200 HP so I'd appreciate the benefit of actual experience. -- Roger Long |
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