All,
I am having trouble keeping my auxillary battery charged. I would appreciate any assistance the group could provide. Here is what I have...
My main battery is a PC680. Coming off the PC680 I have a diode (low forward biased voltage drop around .3v) and a power resistor of around 5 ohms leading to the positive pole on the aux battery. Actually it is two 10 ohm 10W resistors in parallel. I expected that this circuit would keep the aux battery charged to within .3v of the main battery. This is not the case. I most often find the aux battery is around 10.7 or so even when the main battery is around 12.4 or so. If I put the Oddesy charger on the main battery overnight, the aux battery does come up to 11.1 or so. Of course, the main battery voltage increases as well. My annual condition inspection is coming due in July and I expect to replace the aux battery. I'd like to make any necessary changes to the charging circuit then. Any suggestions?
I am having trouble keeping my auxillary battery charged. I would appreciate any assistance the group could provide. Here is what I have...
My main battery is a PC680. Coming off the PC680 I have a diode (low forward biased voltage drop around .3v) and a power resistor of around 5 ohms leading to the positive pole on the aux battery. Actually it is two 10 ohm 10W resistors in parallel. I expected that this circuit would keep the aux battery charged to within .3v of the main battery. This is not the case. I most often find the aux battery is around 10.7 or so even when the main battery is around 12.4 or so. If I put the Oddesy charger on the main battery overnight, the aux battery does come up to 11.1 or so. Of course, the main battery voltage increases as well. My annual condition inspection is coming due in July and I expect to replace the aux battery. I'd like to make any necessary changes to the charging circuit then. Any suggestions?