ArthurEld
Solar Wizard
Thanks for the great ideas guys!
I was planning to use 1/8 x 3/4 110 copper barThe busbars are an open question.
If you want to use a BMS while parallel charging, just hook all the cell sensing wires together. The BMS isn’t smart enough to know if it’s hooked up to the same cell, and will disconnect at the high voltage setpoint.
How will the BMS get enough power to operate at 3.3 volts?If you want to use a BMS while parallel charging, just hook all the cell sensing wires together. The BMS isn’t smart enough to know if it’s hooked up to the same cell, and will disconnect at the high voltage setpoint.
LOL you beat me to itPretty sure it'll not work in 99 % of cases as the BMS need a voltage high enough to power itself.
Can someone please test this?If you want to use a BMS while parallel charging, just hook all the cell sensing wires together. The BMS isn’t smart enough to know if it’s hooked up to the same cell, and will disconnect at the high voltage setpoint.
This will be even more confusing.
Can you see if their is continuity and/or voltage between dc_ok and ground when the charger is off and when it is on?
This drawing is simplified to show how to charge one cell and use the pack bms to programmatically disconnect the charge source.
Code:cc_cv { charge { pos neg } dc_ok { pos neg } } bms { neg { upstream downstream } balance.0<-cell.0.pos balance.1->cell.0.neg balance.2->cell.1.neg balance.3->cell.2.neg balance.4->cell.3.neg } opto_coupler { upstream { pos->cell.0.pos neg<-bms.neg.downstream } downstream { pos->cc_cv.dc_ok.pos neg<-cc_cv.dc_ok.neg } } battery_configuration { cc_cv.charge.pos->+cell.0-|+cell.1-+cell.2-+cell.3->bms.neg.upstream |->cc_cv.charge.neg }
Because the are rated for a amperage for 4s and above and usually not even that.Why are you sad about my busbars smoothJoey?
I was hoping we could use dc_ok as a control signal for the charger.I get no continuity between ground and DC-OK with power on or off.
I get 3.8V for less than 1 sec between ground and DC-OK with power on.
I get slight voltage for less than 1 sec with power off.
My experience with electrical is minimal but I think I checked it correctly
cool !Shorting pins S+ and S- turns the power off. I did it by accident poking around.
Can someone please test this?
It would be great if a BMS still works with all but one cell dead.
That's great.I use a Batrium BMS.
That's part of the reason a barium is like $600.00. Most even without an external power supply will not work this way.Yes, the Batrium will function with the cells in parallel. It has an external power supply (even when running the cells in series)
battery_configuration {
cc_cv.charge.pos->|+cell.0-|+cell.1-+cell.2-+cell.3->bms.neg.upstream
|+cell.1-|->cc_cv.charge.neg
}