Gruber
HobbyMasters
M.L. Toys
KidsWheels
Gruber
HobbyMasters
M.L. Toys
KidsWheels
HobbyMasters M.L. Toys
Gruber
KidsWheels
for 12v vehicles that NEED to be upgraded to 18v
By Biggjimm
#150599
I've got 4 batteries in this hummer. 2- 12v 12ah & 2- 6v 12ah.
I've got a 30amp fuse on the positive terminal of each battery.
I have not had any issues with it.
It has worked fine but I've read that it should be one 40amp fuse & if the batteries are charged all the way up a 30amp fuse should blow.

Is this correct?
Do I have too many fuses?
Is that even possible?

I want to make sure the fuses are actually providing protection & will blow if there's a problem.
Thanks. Jim


By Biggjimm
#150606
It's wired for 12v & 18v.
It runs on 12v for low & reverse & the way it's set up right now in high it starts off on 12v & then jumps up to 18v after 2 or 3 seconds & stays at 18v until she lets off the throttle. And believe me, she doesn't let off the throttle very often. I'm pretty sure she's gonna be a speed freak. Lol.
By Biggjimm
#150611
Is one fuse in the system good or should I keep it with one at each battery. Which is 4 fuses.
Actually, one fuse would work out good because I have to dismantle some stuff to get to the fuses on the 12v batteries the way it's set up now.
When I built it, I figured I'd end up switching to circuit breakers (or to the 40 amp fuses) if I found a scenario that caused the fuses to blow on a regular basis. Like going up the big grass hills at one of the parks we go to ride at or something like that.
Thanks for your time.
Jim
By Biggjimm
#150616
I've got 2 12v 12ah batteries & 2 6v 12ah batteries.
The 12v batteries are paralleled together & the 6v batteries are paralleled together as well but are isolated from the 12v system. No different than if I only had one of each battery except I have double the ah & ride time with two of each.
I have one of CJB's 18v interface modules & turbo timer modules that handle the switching between 12v & 18v as is needed.
The 6v battery only comes into play when the turbo timer module tells the 18v interface module that it's time to go fast & then it sends 18v to the motors instead of 12v.
I currently have a 30 amp fuse on the positive wire of each battery.
I haven't had any problems with it but I wanted to make sure that it wasn't "over fused" & that if there was an issue the fuse would actually blow rather than fry something.
Does that make sense?

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