2-3a max from an alternator
Posted: Sat Apr 25, 2009 10:27 pm
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?
Outer Limits 4x4 Board
Aussie Hardcore Wheelers
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2-3a max from an alternator
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Posted: Sat Apr 25, 2009 10:51 pm
Why would you want to do that?
Posted: Sun Apr 26, 2009 12:12 am
i dont want this battery to expllode/catch on fire
Posted: Sun Apr 26, 2009 6:39 am
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.
Posted: Sun Apr 26, 2009 11:18 am
What type of battery is it -and what voltage is your alternator pumping out?
Sounds like a regulator issue?
Sounds like a regulator issue?
Posted: Sun Apr 26, 2009 1:00 pm
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
Posted: Sun Apr 26, 2009 2:08 pm
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
Posted: Sun Apr 26, 2009 2:41 pm
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.
Posted: Mon Apr 27, 2009 12:13 pm
Yep, DAMMKIA has summed it up. Lithium batteries are very dangerous- get a proper charger before you hurt yourself!
Posted: Fri May 15, 2009 12:05 am
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