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Old 03-04-2014, 02:58 PM
keakar's Avatar
keakar keakar is offline
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Join Date: Sep 2012
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Default need help buying the "right sized" onboard charger

what is the "proper" charging amps (for each bank) to buy? i will be using two series 27 trolling motor batteries for a 82lbs. thrust 24v trolling motor

I have heard 10 amps to each bank is a good size to use and the formula says to use a charger that is at least 10% of the batteries rated amps which in this case is 875 so that would equal a 8.75 amp charger is needed.

i don't know if the formula is overestimating the needs so what im asking is, should I buy the 10 amp per bank chargers or could the smaller and more affordable 5 amp per bank charger do the job?

then there is the price, the 5 amp per bank charger cost around $125 and the 10 amp per bank charger run around $250

so is the 5 amp per bank charger ok to do the job well or would it be undersized and not good enough to fully recharge the batteries overnight to fish 2 days in a row?

the way I will be using this onboard charger is to plug it in to recharge right after a trip then not plug it in again except to do a quick refresh charge the night before I go.

I want to save money if i can but not at the expense of not fully recharge the batteries overnight (12 hours) to be ready for the second days trip.

Last edited by keakar; 03-04-2014 at 03:18 PM.
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