Coach Battery
I have a 2011 31' Jayco Greyhawk DS. The coach battery is failing and needs to be replaced. It currently has a Marine Master DP 27. 650 Cold cranking amps. Since it only has one battery I would like ...
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I have been very happy with my 12 volt Deep cycle batteries from Costco, now about 7 years old.
I killed the pair that came with our used MH. Somehow I got the idea that I could sort of trust the three light battery indicator and that all was well if the voltage was higher than 12.5. In fact, with only a little charging the battery goes way over 13 volts and the idiot lights indicate a full charge. It can take hours for the temporary surface charge voltage to reach its steady state and provide a decently accurate state of charge. Below 50% charge, damage begins. Only a battery monitor showing the % of full charge for counting amp hours going in and out provides a really good indication. Even my $25 eBay one works very well. It was a bit complicated to install because all current to and from the battery(s) must flow through it.
I killed the pair that came with our used MH. Somehow I got the idea that I could sort of trust the three light battery indicator and that all was well if the voltage was higher than 12.5. In fact, with only a little charging the battery goes way over 13 volts and the idiot lights indicate a full charge. It can take hours for the temporary surface charge voltage to reach its steady state and provide a decently accurate state of charge. Below 50% charge, damage begins. Only a battery monitor showing the % of full charge for counting amp hours going in and out provides a really good indication. Even my $25 eBay one works very well. It was a bit complicated to install because all current to and from the battery(s) must flow through it.
