Multiple battery charge question

Submitted: Wednesday, Jun 10, 2009 at 21:59
ThreadID: 69700 Views:3174 Replies:2 FollowUps:2
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This one might have been done before, if not specifically:

Want to add another battery to the aux circuit - at this moment it is a Waeco Thumper which is showing signs of dying after at least 6 years of stirling service. Thinking of replacing it with another AGM battery - they rock! Tried out the new aux AGM over the long weekend on the Autofridge and was impressed after two days (10 hours of running) voltage was down to 12.4 volts. Plenty left (eutectic fridges rock too :)

The question:

What is the best way to charge two aux batteries - simultaneously, or should I add a second isolator relay (using a Baintech one from Battery World at the moment) downstream from the first aux battery? (Sort of a cascade or waterfall effect I guess). The latter method seems to me the most logical and to give the most protection, and reduce the load on the alternator.

Gonna locate the second battery in the back, connecting using Anderson plugs. This battery will be able to to be used as required around the campsite and placed back in the car when required for charging or as a backup for the fridge...

viz
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