In either case (using the transformer, rectifier and filter cap - or using the booster), the transformer is limited to the number of amps it will provide.
I guess the next major question is:
If I connect the "power supply" that should only put out around 4-6A to the battery, will I burn up the power supply if the battery is deeply discharged?
The "correct" answer (at least for lead batteries) would be to use a constant current source - but this was never done in the old days. Maybe a current limit resistor, probably just a transformer and a diode.
I have no doubt that the current will ultimately be limited. But if the battery voltage is relatively low, I'm wondering if I will go through power supplies / transformers quickly?
From: "gvanderhart@midco.net" <gvanderhart@midco.net>
To: electricboats@yahoogroups.com
Sent: Saturday, January 4, 2014 10:41 AM
Subject: [Electric Boats] RE: Charger design options
To: electricboats@yahoogroups.com
Sent: Saturday, January 4, 2014 10:41 AM
Subject: [Electric Boats] RE: Charger design options
I think that either scheme will work. If 24V rectifier and filter, you should get 30V to 34V DC. If 12V rectifier and filter followed by a DC to DC converter, you can more precisely adjust the output voltage. In either case, the challenge will be to limit the current to around 5A. If the voltage is adjustable, then monitor the current and set the voltage appropriately. If the voltage is not adjustable, then a current regulation circuit is needed. I would search for a simple series (high power) FET circuit or buy a regulator intended for a solar or wind charging system. This would work better for LiFePO4 batteries since they do not have the bulk-saturation-float charging requirements that accompany lead acid batteries.
Gary Vander Hart
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