Multiple Battries

**danon** · 10-13-2004, 02:00 AM

Originally Posted by kiltjim

So, I would be safe using just a standard 30 Amp relay to control my yellow top charging? I thought I needed something much more heavy duty. And how heavy does the wire need to be? I was thinking I needed something like 2 AWG or heavier. If I only need a standard relay, I could start installing this thing now.

go for atleast 4 awg. you may need to check your local electronic or car shops for a suitable crimp connectors 'coz 8g is already big let alone 4g. also keep in mind the following:

* the higher amp alternator (dynamo) you got, the better. this would also mean higher amp relay.
* never let your main batt. be drained 60% or you'll find yourself stuck in the parking lot. some kind of a control cutoff in the relay is important.
* get a battery charger, use it while your car is in the garage were you have access to power outlet. this will take too much strain off your alternator.

keep in mind that this type of setup works for me and to other members of the forum 'tho i am not endorsing it, you'll find your own need once you got your setup running. goodluck.

.

**danon** · 10-13-2004, 02:14 AM

Originally Posted by Mr Crown

Here is a diagram:

[IMG]2BATERIAS.jpg[/IMG]

Use this setup.

2 things:

1.Beware of making your sysbatt too big cause this will overload your generator during charge.

2.Your diode amp rating should be: PSU required amps + batt charging amps. Maybe heat sink needed.

Thanks.

mate, your tank batt. will not have (+) access to your generator because of the diode and will not overload it.

if you have found a diode suitable for very high amp (30-70 amp) please let me know.

the diode setup is best used if your tank batt. is a sealed lead acid bec. this batteries only has a very low amp (eg. 0.4 - 2.5) and is being used by some members for the purpose of surviving the crank.

diode also tend to reduce some 0.7v of the power.

.

**Mr Crown** · 10-13-2004, 02:45 AM

Your generator WILL charge your batt (forward current), but your starter wont discharge sys batt (reverse current).

If the battery is deeply discharged and is big enough, IT WILL OVERLOAD YOUR GEN, as the gen is only designed to recharge the energy consumed during crank, not during hours of playing.

Last week I buyed 4 diodes 400V@75A@~5US$ each here in Dom.Rep.(for a batt charger), just ask at any store, they should have it.

It will drop 0.7V but just while high amp charging, as sys batt gets charged diode voltage also drops, and the 2 batts ends at the same voltage.

Thankx for posting.

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