I have a led bar.1cm wide 35 cm long.With 15 led lights on it.Realy nice looking.What I want to do is ,to build a power meter.Like the kind you find on car booster packs.Push a buton ,And depending how many lights lihgt up,tells you how much power you got.1 light dead, 15 lights full.This will be based on a 72 volt pack.
I need to convert 72 volts to 30 volts (give or take 4 volts up or down) for my cooling fans . 2 so far, equel 24 volts .2 amp.Will go to 3 fans if it makes it cheaper or easyer.Dont want to use resiters.
Thanks for your time and info
TEAM GREAN out