letsgetem wrote: THis is old hat thats no doubt been discussed before. My boat battery failed after 2 and a half years. Thats pretty short time.Ive bought a new one, ok. Im not very knowledgable re batteries. Im thinking that, the battery doesnt like dropping to low charge. Ive got a anchor winch. It drains heaps of charge out of the battery. Then I run, mostly very short trips, to other places and back home. Possibly not enough to fully charge the battery. So, is it likely, the battery has dropped (and stayed) too low, and thats caused it to fail. With the new battery, when I raised the anchor, I saw (on my sonar voltage readout), the voltage dropped from about 12v to 10.7v; that seems pretty low? Its a 100w anchor winch, thats a high drain on the battery. I will fully charge the battery (with a charger), and the see how much the voltage drops on anchor raising. I would appreciate any words of wisdom on this. |
letsgetem wrote: THis is old hat thats no doubt been discussed before. My boat battery failed after 2 and a half years. Thats pretty short time.Ive bought a new one, ok. Im not very knowledgable re batteries. Im thinking that, the battery doesnt like dropping to low charge. Ive got a anchor winch. It drains heaps of charge out of the battery. Then I run, mostly very short trips, to other places and back home. Possibly not enough to fully charge the battery. So, is it likely, the battery has dropped (and stayed) too low, and thats caused it to fail. With the new battery, when I raised the anchor, I saw (on my sonar voltage readout), the voltage dropped from about 12v to 10.7v; that seems pretty low? Its a 100w anchor winch, thats a high drain on the battery. I will fully charge the battery (with a charger), and the see how much the voltage drops on anchor raising. I would appreciate any words of wisdom on this.
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letsgetem wrote: Its a 90hp Mercury 4 stroke. The battery is 530cca 52AH. |
letsgetem wrote: According to the manual (for the Mercury 90hp), the alternator charges at 50amps. When its charging, the voltage rises from 12v to 14v. And I can confirm the motor alternator does not charge until over 1000rpm, ie not at idle. |
letsgetem wrote: Good stuff, thanks. According to the motor specs (2018 90hp 4 stroke) - the alternator output is 50amps. THat appears a lot higher than the 2 stroke amps mentioned. One thing Im bothered by. THere doesnt appear to be a way of measuring the % charged of the battery. If there was, I would know whether the battery needs charging - and put the charger on it. Has anyone figured a way of measuring this? |
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