Barry Wilkins
New Member
Hi I want to change the way my leisure battery is charged in my motor caravan, the starter battery is 88 Ah and the leisure battery is 110Ah.
I can charge either battery from the mains so they are fully charged ,but when you start the engine a relay connects the batteries in parallel,any extra capacity in the leisure battery will be used up so you end up with only 88Ah in the leisure battery.
My idea is to remove or disconnect the split charge relay and charge the battery independently from the alternator ,but I dont think this is going to work very well because of the maximum voltage output of the alternator. I think I need a minimum voltage of 16 volts to regulate this charge even if I use a high power mosfet with a very low rds of 0.014 ohms.
This means I need a buck boost circuit to raise the voltage from the alternator so I could operate a charging regulator.
Does any body have any other ideas I could use ?
thank
Barry Wilkins
I can charge either battery from the mains so they are fully charged ,but when you start the engine a relay connects the batteries in parallel,any extra capacity in the leisure battery will be used up so you end up with only 88Ah in the leisure battery.
My idea is to remove or disconnect the split charge relay and charge the battery independently from the alternator ,but I dont think this is going to work very well because of the maximum voltage output of the alternator. I think I need a minimum voltage of 16 volts to regulate this charge even if I use a high power mosfet with a very low rds of 0.014 ohms.
This means I need a buck boost circuit to raise the voltage from the alternator so I could operate a charging regulator.
Does any body have any other ideas I could use ?
thank
Barry Wilkins