ok here is the deal I would like to use a CC supply to equalize my cells in my aging hybrid battery, and I would also like to discharge the battery for reconditioning as well. the total pack outputs a voltage from 242V max to whatever I decide to drag it down to with the light-bulb(in my case 2x 200W, 100W or 25W standard household light-bulbs in series) discharge. Since the conditioning power supply I am using is a CC led power-supply with a 300V diode attached to ensure the psu is protected and it only kicks on above 135V that is the max I want to drag it down to. However I can’t let it be dragged down to that with 200W bulbs or even 100W ones (2x100W in series limit should be 185V then use 25W bulbs in series. ) so detecting the current flow would be advisable. Also I would like to switch the current in either flow direction with a FET because:
A. I would not like the connector hot unless the power supply is plugged in.
B. I would not like it to be able to charge without the 12V fan going
C. I would not like the discharge to be able to run down too far or even to quickly starting at a certain voltage level.
would like to use a nano supplied by the same 12V that powers the fan (this ensures it won’t be able to boil the batteries fan has to be powered for arduino to be, but catch is both power supplies (the CC HV DC one and the 12V wall wart) would share the same AC Line.
so I read here that common grounds can be a problem with voltage dividers , also any recommendations on the FET’s mind you I want to use them basically as relay’s either power supply or drain light bulbs connected to the battery.
Any hints on the design I would plug the nano into , also I would use some sort of voltage regulator from the 12V because I want to power an LED to readout the voltage and current currently flowing.
Any advice appreciated