MisterSandals
Participation Medalist
Out of curiosity, why switch from 6awg to 4awg before and after the shunt?
Is one a long(er) distance?
Is one a long(er) distance?
Thanks, I have 100A MRBF but that seems too big. Should I get 30A MRBF? Or, 20A ATO fuses?You should have a fuse on the positive leg.
That is the size of the wires on my BMS. There are 4 of them.Out of curiosity, why switch from 6awg to 4awg before and after the shunt?
Is one a long(er) distance?
The fuse is to protect the wire and 100amps is withing spec for 6 awg.Thanks, I have 100A MRBF but that seems too big. Should I get 30A MRBF? Or, 20A ATO fuses?
That is the size of the wires on my BMS. There are 4 of them.
I am wondering why not use a 15a fuse when the charger is rated for 12a?The fuse is to protect the wire and 100amps is withing spec for 6 awg.
Yes and no.I am wondering why not use a 15a fuse when the charger is rated for 12a?
I get that the fuse protects the wire but as drawn in post #119, the positive leg should not exceed 12a if operating correctly.
Wouldn’t tighter tolerances on the fuse be better?
You kind of lost me but it sounds like the fuse type/design is the problem rather than the size.The ATC fuse aic=air interuppt capcity is very low and its possible the fuse might blow and still sustain an arc in a dead short.
You kind of lost me but it sounds like the fuse type/design is the problem rather than the size.
If the fuse blows yet the break/gap is small enough to arc across is disturbing and new to me. Is that because its 48v?
I wasn’t suggesting using an under rated fuse. That 15a atc is woefully inadequate.The atc/atc fuse is only rated for 32 volts
Nothing would get hurt if 100A went through. 100A is to keep the wire from burning up.I wasn’t suggesting using an under rated fuse. That 15a atc is woefully inadequate.
My thought was that if a LOT more than 12a were on that line, my preference would be for a fuse to blow. A 100a fuse seems way too big to help the charger side.
You are saying that the 48v 12a charger will handle 100a?Nothing would get hurt if 100A went through. 100A is to keep the wire from burning up.
Isn't the fuse to protect the battery from the charger? I don't think anything will send amps to the charger.You are saying that the 48v 12a charger will handle 100a?
I do not know but i suspect not.
You are saying that the 48v 12a charger will handle 100a?
I do not know but i suspect not.
The fuse protects the wire first.Isn't the fuse to protect the battery from the charger? I don't think anything will send amps to the charger.
Understood. My point was charger not protected.We are not trying to protect the charger.
Its a single circuit with a single purpose.I thought the main fuse connected to battery positive is to protect the cables in case of a short and everything else should have a separate fuse?
I took a closer look at the diagram. A single fuse would be ok and I would place the fuse as close to the cell positive as possible. I don't know of any reason it couldn't be placed on the negative side for that matter. Maybe I didn't read back far enough but what loads are planned?Its a single circuit with a single purpose.
How many fuses would you use and where would you put them?
Yes that is fine. The Riden has two internal fuses. I am not sure about the actual power supply. Did you top balance the cells already?I think I have everything connected right. I still need to get some thin wire for battery connections to the coulomb meter.
I haven't turned on the power supply or BMS yet