bettery HELP NEEDED

[justlooking]

ok i have been offered a EV but the batteries are not much good ,,
it has lead batteries as follows

12 Batteries 12V, 270 Ah @C20 (3 batteries parallel,each pack seriel)

im useless at maths so was wondering how many lithium batteries i would need to replace the lead ones ?? so that i can work out the cost for the lithium batteries.

its a 48 Volts vehicle.

 

[friendly1uk]

Is that 270Ah each, or for the pack?

 

[agniusm]

12 150ah calbs?!

 

[justlooking]

Is that 270Ah each, or for the pack?

its for the pack m8

 

[dogman dan]

In lifepo4, 16 cells or groups of parallel cells is "48v". You'd get twice the range from any lithium than from lead, so 150 ah would work for you.

The battery is what costs you, so you could start out with 100 ah, then add some more later. 100 ah of 2c rated lifepo4 would be able to easily supply a 100 amps controller. So look at the controller specs to figure out how much ah is required by that system. If you have a 200 amps controller, you'd need 150 ah minimum, and preferably more.

 

[justlooking]

thanks m8 ,, i dont know if this will help ,,
Motor Permanent Magnet DC 4kW ..

i have no idea about the controler but will try and find info about it ,, the EV is actually a car ( ) Aixam Mega e-City

 

[dogman dan]

Assuming controller wattage matches the motor rating, 4000w divided by 48v would get you 83 amps. Your controller may have marking on it that gives the amps, or you might just have a model number, which you could look up the specs for.

100 ah of typical prismatic large format lifepo4 should be enough to not overstress the cells. ( assuming a 100 amps controller, or even up to 150 amps) Then more money for more range.