I know charging a battery with too high a voltage isn't good for it but what I'm proposing would only be for a short amount of time and with a slightly higher V than normal. The battery I'm looking to charge is a standard car lead acid battery and the voltage I'm looking at running would be 17.5v max which is about 20% higher than the charging/running V of 14.4 that an alternator puts out.
I would suspect that the charging time would only be about 5-10 mins, maybe 15 mins max, at this voltage.
A voltage converter could be used to drop the V from it's normal V down to ~14.4 but that would waste a fair amount of energy as heat and in this situation wasting energy is not desirable so keeping it at about 17.5v would eliminate the need for the converter and I'm guessing it would charge slightly faster. A low voltage cut-off circuit is used on the power source.
If the battery charges faster with the higher V. The energy that goes into the battery, let's say 17.5V @ 10A = 175watts where charging at 13.8 @ 10A would give 138watts. If the battery is very low in charge, will it store this excess of 37watts or would that excess be lost as heat? I'm not sure how batteries work when they get higher V's than the cell can store. I'm suspecting that it would store the energy in this case, but IDK.
I would suspect that the charging time would only be about 5-10 mins, maybe 15 mins max, at this voltage.
A voltage converter could be used to drop the V from it's normal V down to ~14.4 but that would waste a fair amount of energy as heat and in this situation wasting energy is not desirable so keeping it at about 17.5v would eliminate the need for the converter and I'm guessing it would charge slightly faster. A low voltage cut-off circuit is used on the power source.
If the battery charges faster with the higher V. The energy that goes into the battery, let's say 17.5V @ 10A = 175watts where charging at 13.8 @ 10A would give 138watts. If the battery is very low in charge, will it store this excess of 37watts or would that excess be lost as heat? I'm not sure how batteries work when they get higher V's than the cell can store. I'm suspecting that it would store the energy in this case, but IDK.