DIY High Voltage Battery Reconditioner - Grid Charger

This reminds me... the Prolong sytem both the 350v one and the 250v one at 350mA takes a 28 module pack up 240v (8.57v per module) at full charge and the balancing phase is roughly between 240v and 245v (8.75v). And some packs are slightly lower than that while some packs are slightly higher than that. I've also found the oldest modules with the least amount of capacity will easily shoot up over 9v. Which is me coming around to making my point that you want to keep a close eye on things and don't let pack voltage or module get too high (at least after first round of reconditioning) or you're gonna have more hassles rather than less.

 

In these Meanwell LED supplies, when the load goes below it's minimum voltage (143V for the LPC-100-350), it will think that the load is shorted, and will keep shutting down and restarting, called hiccup mode in the specs.

Technically, you would need another way to kick start your battery to 143V, like using a lower voltage supply like the APC-35-350 28-100V @350mA or HLG-60H-C350A 100-200V @350mA. Alternatively, you can hook up a 150 ohm resistor in series, which will add 52.5V to the circuit. It dissipates 18.375W, so make sure you have a resistor rated 25W or so, with appropriate cooling.

Practically, I found that even after discharging to 84V, all I had to do was let the battery sit for a hour or so, and the voltage climbed back up over 143V, and allowed me to use the LPC-100-350 to charge normally.

Cell reversal just means that that particular cell is being charged instead of being discharged. As long as the rate is low (trickle charge rate of C/20, or 325mA for 6500mA cell), you should be fine. In fact, some threads recommend discharging to 0v to better 'recondition' the cell. I never went that low because 84V (or 0.5V per cell) worked out for me.

As with all things on the internet, take any advice with a grain of salt. You will find a lot of anecdotal posts that say that 0.5V (or even 0V) per cell worked great, but you need to make your own decision on what voltage you are comfortable with. All I can tell you is that 0.5V per cell worked for me.