To turn off/on my trike I need a keyswitch 30-40A 36V. (on the + battery)
I found keyswitchs but not 30A keyswitches.
Do you know where I can find it ?
ps: I wouldn't like use a crossover relay because it eat energy
Greg,
I know it's not very small or attractive, but something like this battery isolator switch would do the job:
Click for further details Don't worry about the stated 24V max, this switch can handle 1200 Watts continuous and will work fine on your trike.
Most car accessory shops will sell them.
An alternative is to use a low power key switch with three 12v 15Amp relays.
Their coils wired in series for 36V operation and the switch contacts wired in parallel for 45Amp switching.
Approx 100mA power consumption (3.6Watt for all three relays)
Alan