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2-3a max from an alternator
Moderator: -Scott-
Posts: 912
Joined: Tue Nov 09, 2004 6:29 pm
Joined: Tue Nov 09, 2004 6:29 pm
Location: {Sydney, Australia or Rio, Brazil Ride: Sierra JXi}
2-3a max from an alternator
is there a way to make a alternator only supply 2-3a to charge the battery whilst still 100% powering the electrical load of a vehicle?
-[b]Santos[/b][img]http://www.teamswift.net/images/smilies/icon_furious.gif[/img]
Suzuki, Jeep & Toyota Soft tops with welded seams for SALE (PM me)
Suzuki, Jeep & Toyota Soft tops with welded seams for SALE (PM me)
Posts: 912
Joined: Tue Nov 09, 2004 6:29 pm
Joined: Tue Nov 09, 2004 6:29 pm
Location: {Sydney, Australia or Rio, Brazil Ride: Sierra JXi}
An alternator will only supply what is drawn from it. When a batt is flat it will draw around 30A (example) from the alt but once it is charged it drops right down to almost nothing.
If the alt is working properly it wont explode a batt.
If the alt is working properly it wont explode a batt.
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Posts: 912
Joined: Tue Nov 09, 2004 6:29 pm
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your concerned that when you run it flat it will draw more current till it gets up to a decent charge level??Santos wrote:12v 10a lithium, havent hooked it up but i understand the battery will draw more if it ran flat... thats what i am concerned about
[quote="Barnsey"]
Bronwyn Bishop does it for me.[/quote]
Bronwyn Bishop does it for me.[/quote]
Don't f**k around with charging lithium batteries, they have a habit of dangerously exploding if incorrectly charged.
They have the ability to accept more charge the hotter they get (sort of positive feedback), ultimately leading to a serious explosion.
There are specific chargers that measure the temperature of the cells and limit the charging current accordingly, and this is generally done on a cell-by-cell basis (ie. 3.7 volts/cell) by effectively disconnecting the individual cells while charging, as well as on a specific size of cell.
Best source for these chargers to run off 12 volts is the model aircraft arena where these batteries are commonly used and recharged.
They have the ability to accept more charge the hotter they get (sort of positive feedback), ultimately leading to a serious explosion.
There are specific chargers that measure the temperature of the cells and limit the charging current accordingly, and this is generally done on a cell-by-cell basis (ie. 3.7 volts/cell) by effectively disconnecting the individual cells while charging, as well as on a specific size of cell.
Best source for these chargers to run off 12 volts is the model aircraft arena where these batteries are commonly used and recharged.
George Carlin, an American Comedian said; "Think of how stupid the average person is, and realise that half of them are stupider than that".
A small update on why you do not incorrectly charge LiPo batteries. Actually an advertisement for the model aircaft ppl, but still relevant here.
http://www.youtube.com/watch?v=z3o_2mwRPdw
Makes you wonder what it's going to be like when the first LiPo powered all electric car goes up 
http://www.youtube.com/watch?v=z3o_2mwRPdw
Makes you wonder what it's going to be like when the first LiPo powered all electric car goes up
George Carlin, an American Comedian said; "Think of how stupid the average person is, and realise that half of them are stupider than that".
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