Hey Guys,
I've noticed many battery isolators claim to be able to isolate the main battery from the aux battery during charge.
In other words prioritizing the charge of main battery before it switched to the aux battery, as in the below link.
http://www.baintech.com.au/the-shop/...y-12v-24v-100a
It's obviously B/S to claim an isolator that has no direct connection to the alterantor or does not connect to the alternator before the batteries, are able to prioritize main battery charging. Electrically and electronically impossible task from the above design, 'cos there a one positive terminal for the main battery, another positive terminal for the aux battery and the third terminal for the Earth. This clearly indicated isolation for draining, not for charging. So, the unit prevents the main battery from getting drained while the aux battery is used for appliances(engine not running).
Few questions popped into my puzzled brain, which I'm hoping an electrickery expert here can provide me with an answer or two.
1)Do most of the VSR battery isolators make the bogus claim as above? (I have a Matson one that doesn't claim as the above brand one. But, I thought it was capable of prioritizing the main battery charge, until I looked at the isolator, which only have two positive terminals for each battery and an earth terminal, which clearly indicated it couldn't do such thing as I was expecting.)
2) Are there any genuinely charge isolating(prioritizing the main battery) battery isolators out there??!! Do they exist? Any links to that sort of isolation unit?
3)Do they(no 2 above) actually necessary? Are there any benefits of charging the main battery first and then allowing the charging process to the aux battery? One benefit I can imagine is that with a such kind of charge isolation, the need for high amp alternator may be reduced.
Thanx
Dom
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