I know they're bussed together right now, but I'll be rotating each one 90 degrees after the heatsink is cut. I also still need to get 6 AC powered fans to blow on top of each of the 6 sections of heatsink. I'll be running supply/setpoint wires to each op-amp circuit from the Pot and power supply.
There's a 2A 12V supply to power the op-amps, contactors and meters.
If we need an immediate constant current, we can set, then disconnect, recharge the battery, reconnect and re-test, which I could automate later. Most of the testing I want to do is fine with a little bit of adjustment. It'll be a little guess and go for now, but I figure I'll hook it up, set current manually with the current monitor and continue the test. I've got one potentiometer driving 6 voltage dividers to set the current. If any of these trip, a relay will unlatch and ground out the FET that drives the Darlington Pair. I'll also have a BRB inline with the alarm circuit. Each display has alarms I can set and I will set these to over-temp, under-voltage and over-current. The two displays shown are for Temperature monitoring (on the right) and Voltage/Current/Ah monitoring (on the left). The contactor is only opened/closed as a means to disconnect the battery, not to stop discharge. Each pair of modules gets it's own contactor, and it's own fuse.
#WEST MOUNTAIN U1 BATTERY BUDDY DC TO GO DRIVER#
Here's a pic of what I've got (click to enlarge):Įach module has it's own 250A/50mV shunt for it's own individual op-amp circuit, so 6 driver circuits. I'd need some 150+CFM Fans, 6 driver boards and some electronics to cut off the discharge during overtemp, undervoltage and overcurrent. We ended up figuring that I could do ~3000W max discharges if I split the heatsink I have into 6 with one per module, instead of 2 long pieces with 3 modules each. I followed magudaman's 1000W discharger build and emailed John Muchow a bit to do some heatsink/module calcs. I figured I had most of what I needed for a high-power battery discharger. A while back I aquired 6 Darlington pair modules (400A/600V) and matching heatsink from a buddy of mine. I've finally gotten back to my discharger project. Reposting from Endless-Sphere in hope of some additional critique:
0 kommentar(er)
