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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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  #11  
Old 07-29-2009
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I asked because I know that my batteries are not up to snuff, but I don't know just how bad they are. We are hours away from the boat, so it's difficult to find the time to let the batteries come up to full charge then rest for 12/24 hours then let them drain at the recommended rate, etc. As I read the original statement as to float normally being at 13.6 I looked up and saw 13.3 on my link 2000R and wondered what sort of measure that might provide. I did notice a few days later after a sail and being plugged into the dock again, that the float again settled at 13.3.

The batteries are t-105s...four of them about five years old.

Thanks for the replies.

Bruce
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  #12  
Old 07-29-2009
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Does the charger have a temperature probe connected to the batteries?

If I lived hours from the boat I would have a mechanic stop by and do a load test. He will be able to see of the batteries behave normally under a load.

I'd say the float voltage has more to do with your charger than your batteries, unless they are really really bad.

Since you have a battery monitor you should be able to run the batteries down to 60% or so and then look at the voltage (after resting for a while). If the voltage is below what the tables say then your batteries are on their way out.
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Old 08-03-2009
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Steve....
After a long weekend on the boat and re-reading the Heart 10 manual, the float (and accept) voltage is a function of temperature and what I was seeing was pretty much spot on according to their chart.

I did get to run a short load test....drawing 30% out of the batteries with a 5% load (440ah T-105s) stopping for short rest at 3 points. The voltage readings at those points were about 22 ah (5%) low. I had thought the batteries were in worse shape. Perhaps if I had had the time to go down to 60% I would have seen much worse performance?

Thanks, Bruce
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Old 08-03-2009
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Based on the numbers you provided, I think your batteries are doing alright. Pulling them down a bit further and then waiting longer to look at the resting voltage would have been a more rigorous test. I'd just keep an eye on them at this point.
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