I have a 13s6p Lion array with BMS I want to charge from a 12v source.
After letting the smoke out of an undocumented Chinese boost converter, I was wisely directed to Mouser where I bought a GE 65W Boost Converter (8Vdc –16Vdc input; 32Vdc to 54Vdc output; 65W Output power (max.)) for the same purpose. Very compact.
I attached a variable pot to program it's output voltage and managed to tune it to a desirable output of 54v.
My QUESTION regards how to deal with a dramatic voltage drop to 34v when connected to the BMS. I am hesitant to adjust the voltage programming. The resistance adjustment can actually program to module to produce voltage much higher than 54v when there is no load.
Q: Is it safe to adjust it's output (that drops to 34v) back to the desired 54v output when applied to the load of my un-documented BMS?
I know the batteries can be charged at much higher current than I am using (12v at 3 amps input). For 54v, at 65w, the booster is rated for just over an amp which is within the individual battery's tolerance. It seems like it would not be enough however since I have 6 18650's in each cell.
I have ordered an inexpensive 54v charger which is yet to arrive but I would prefer to use this GE module in conjunction with an Arduino and INA219 GY-219 Bi-direction DC Current Power Supply Breakout Sensor Module.
If my boost converter can't keep up a trickle charge I don't want to waste my time.
I am unfamiliar with some of the features for which I would appreciate some clarification (indicated with (?))
Features: ▪ 8Vdc –16Vdc input ▪ 32Vdc to 54Vdc output ▪ 65W Output power (max.) ▪ Output voltage programmable from 32 to 54Vdc via external resistor ▪ Tunable LoopTM to optimize dynamic output voltage response (?) ▪ Power Good signal ▪ Output over current protection (non-latching (?)) ▪ Over temperature protection ▪ RemoteOn/Off ▪ Ability to sink and source current ▪ Support Pre-biased Output (?) ▪ Optimized for conduction-cooled applications ▪ Small size: 27.9mm x 11.4mm x 8.5mm (0.8% the size of Chinese model)
As I interpret the datasheet, the "Tunable Loop" feature is intended to handle fluctuations in current draw. I don't know if this is required to fix my problem.