Good LEAD
 

Hi,

What 12v supply would people recommend for 2 x 7.4v, 4000 - 5000mah

20c, racing an 1/8th electric buggie for a day?

Hurry up summer! :thumbsup:

cheers James

what charger and what amps are you pulling?, id say a mains psu powered by a gennerator

Being 20C packs I'd guess at 1C most anyway, so 14.8V at 5A. 16.8x5=84W, then /0.75 (75% Charger efficiency) = 112W. So, at 12V, you'd need a supply capable of at least 9.5A continuous OUTPUT. That'd be a very big leisure battery or a pretty decent generator then.

This is something I've been pondering, how are you powering your charger at outdoor races Marv?
Would a decent leisure 12v last the day if you had one 5S pack to charge say 5 heats possibly 7min running in each then a 15/20min final (If you can run that long)

I've coped all this season doing one charge all day (so has been on a normal car battery). I used a 5500mAh 5S pack - went out in heats with 1 minute to go, and came in when I'd finished (1 or 2 'cool down' laps). Then I'd charge at 3C at lunch, and easily be ready for finals.

Alternatively, have two batteries!

Marvin, do you caharge at 3c (when your lipo is capable of a 5c charge) because its kinder to the lipo's life?

No, it's because I don't have a charger capable of 577.5W (5.5Ax21Vx5C) and 27.5A charge rates...

It is kinder to the LiPo though - I'd only charge at the higher rates when at a race day - when necessary, I wouldn't charge at that rate at home - there's no point unless you're running late.