Join Date: Jan 2003
Location: Maine Coast
Thanked 219 Times in 167 Posts
Rep Power: 16
Re: m25 alternator question
You reminded me and pointed out the problem. I set up the battery monitor and celebrated it with the battery's at 80% and the manual tells me I have to celebrate at 100%. So I assume that is why my BM-1 is off I think.
Yes the batteries must be at 100% SOC before you can calibrate it. You can determine a "good enough" full point by measuring less than 2% of the 20 hour Ah capacity flowing into the bank. With no DC loads on, and you see less than 5A flowing into the bank, you can then do a manual re-set. I find monitors are much more accurate when synched manually and done often. 1-1.5% of the 20 hour rate is an even better "full point" but when out cruising you'll rarely get there.
-Maine Sail / CS-36T
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