Charging an 18Amp Hr battery
Submitted: Tuesday, Apr 12, 2011 at 21:20
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Drew - Karratha
G'day everyone
I am after a bit of advice... In a few days I am heading up north with a few mates on a fishing / dive trip. We will be heading out in the boat and staying on an island for about 5 nights. One of the guys has bought an 18 amp hr battery to run a flouro light off each night (the flouro draws .75 amps). I was intending on making up a lead with alligator clips on each end and just connecting the 18AHr battery to the boats starting battery to charge it as we are driving around each day - will this work (it is a 90hp Yamaha 2 stroke - if this makes a difference??).
I do have a small Projecta 300W inverter that I am taking to charge camera batterys, and have a Purecharge 3 stage battey charger - that I wasnt intending on taking (8 Amp I think). If the first idea doesnt work - would the charger run off the 300w inverter???
i have spent enough on the trip already - so arent keen on spending any more if possible........
Thanks heaps
Drew
Reply By: Robin Miller - Wednesday, Apr 13, 2011 at 10:47
Wednesday, Apr 13, 2011 at 10:47
Those Gel cells types suffer from to fast a charge easily Drew so take care.
Typical inital inrush current is only around 5 amps else bubbles form under gel limiting contact with plates and they degrade.
If it wasn't used much you may be ok , but I always reccomend charging thru something that limits this peak current.
Even a 0.47 to 1ohm 10watt resistor will do or a long piece of thin cable.
Don't leave on to long either as they are a bit touchy with over 14.5 volts.
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Follow Up By: Drew - Karratha - Wednesday, Apr 13, 2011 at 22:30
Wednesday, Apr 13, 2011 at 22:30
Thanks Robin - would a smaller inline fuse help?
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Follow Up By: Member - Boobook - Thursday, Apr 14, 2011 at 07:01
Thursday, Apr 14, 2011 at 07:01
A smaller fuse wont help what Robin is talking about. But chek the specs on the outboard, I doubt if it could put out much more than 5 A especially when the battery is is parallel to the main battery.
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