Perhaps Capacity is Not King
I don't want to derail the current "charging AGM batteries" thread more than I already have. During the course of that thread I was shopping for AGM batteries, trying to determine which ones could ...
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landyacht318 wrote:
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When i turned my battery switch to both, bringing the AGM northstar into the loop, the draw from the Crown dropped to 0 and all the current was flowing from the AGM which was at ~12.9v.
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I don't know who said anything about cycling a starting battery. Just because it is in my engine compartment does not mean is is a starting battery. I have not owned a pure starting battery in 12 years. My engine requires a 650 CCA battery, and I've had a 600 CCA Marine wally world -27 battery in there for the last 7 years
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I guess we'll see how my strategy of less capacity works out.
Please do not keep the AGM and wet connected full time. The wet will, at a minimum, suck the Volts from the AGM until the two reach equilibrium. This leaves the AGM at about 75% SOC and will result in sulphation of the AGM due to chronic undercharging. You now have two banks, not one. Why not two matching, wet or AGM?
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AGMs are hybrids. Does this read like a starting battery spec? "Cycles over 400 times to 80% depth of discharge". That equates to camping every weekend for 8 years with an 80% drawdown every time.
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Yep, I also subscribe to the smaller is better for bank size and agree with your analysis. Lions and Tigers and.... :)
HTH;
John
