more battery questions

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caw

New member
This topic has probably been beaten to death----but I'm going to ask anyway. I'm buying two new batteries for my 23 Venture.When I took the old batteries out, discovered both are group 24 cranking batteries---this ain't right!!! I have the normal 4 position battery switch, no isolator or combiner. AC/DC fridge with the DC mode getting abused.Sometimes I forget to switch from cranking to house for longer than I care to admit. At some point I will add an isolator but not enough time before my next extensive trip. So, with my forgetfulness, would I be better off with two deep cycle batteries rather than one cranking and one deep cycle ---dedicate one deep cycle to cranking and one to house----until I remember to install the isolator???
 
caw":1ea55iyp said:
This topic has probably been beaten to death----but I'm going to ask anyway. I'm buying two new batteries for my 23 Venture.When I took the old batteries out, discovered both are group 24 cranking batteries---this ain't right!!! I have the normal 4 position battery switch, no isolator or combiner. AC/DC fridge with the DC mode getting abused.Sometimes I forget to switch from cranking to house for longer than I care to admit. At some point I will add an isolator but not enough time before my next extensive trip. So, with my forgetfulness, would I be better off with two deep cycle batteries rather than one cranking and one deep cycle ---dedicate one deep cycle to cranking and one to house----until I remember to install the isolator???
Click to expand...

caw-

The standard answer I usually hear is one deep cycle for the house, and a "dual purpose" type starting/deep cycle battery for the motor, but since the starting amperages are so low for the motors we use, I prefer two deep cycles, since they're more bullet-proof being able to withstand deep discharging better.

You'd be OK with either choice.


My best guess!

Joe. :teeth :thup
 
I agree with Wolf using a start battery doesn't do well if it gets heavy discharging/recharging. Plus, when paralleled for charging, a start battery may keep the house (deep-cycle) from becoming fully charged.

But why not use a Voltage Sensing Relay instead of an isolator? I think the VSR has many advantages over isolating diodes. The Blue Sea model can handle up to 90 amps. Most motors for the 23' Venture won't put out much more than 50 amps. Leave the selector switch on position 1 and let the VSR do the charge selection.

Tim & Dave Kinghorn
 
Tim & Dave Kinghorn":2okps8zf said:
Plus, when paralleled for charging, a start battery may keep the house (deep-cycle) from becoming fully charged.

Tim & Dave Kinghorn
Click to expand...

I do not recommend parallel charging, regardless if the batteries are of the same type or not. If they are of different states/condition, one may prevent the other from charging, and discharge it to some degree after charging is off.
 
I just bought two new Group 24 batteries this month, after i told the dealer that i had a battery selector switch and could start the engine/run all accessories from either battery he recommended that i buy two deep cycle batteries. He said that they would last longer than having one starting and one deep cycle battery in my situation. Tug
 
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