StinkyGoalieGuy
100 W
- Joined
- Apr 23, 2008
- Messages
- 298
I’m looking for help on how to charge using Mean Well LED power supplies. I've done some reading and I think I know what I’m doing, but just need clarification on a few things.
Here are the details:
Battery: 24S1P, Headway 38120HP cells
BMS Purchased, not yet received – JBD 24S, 100A common port smart BMS https://srikobatteries.com/product/jbd-smart-lifepo4-24s-72v-100a-common-port-bluetooth-bms/
1. Is there an existing wiki on how to charge with a power supply?
2. There isn’t a Meanwell power supply with adjustable current and voltage that will go up to the 86.4 volts that I need as far as I can find. Please let me know if i'm wrong.
3. When series connecting an ELG or HLG Meanwell power supply, do I just simply connect the negative DC output from one supply to the positive output of the second power supply?
4. Suppose I want to charge to 3.5V per cell (lifePO4 cells), 3.5 x 24 cells in series = 84V. So I dial the combined voltage of the two series connected power supplies to 84 V. Do I just I check this with a multimeter?
5. When do you decide to pull the plug on the charging process? My understanding, the power supply starts in the constant current phase, and eventually reaches 84 V as the current drops. Do I just keep monitoring the power supply until it drops to about 3 % of the set current? So if the power supplies are set to 4 amps, do I just stop charging when I see the current drop to 0.12 amps?
6. What should I use to monitor the amps in the charging process. Something like this?: https://www.amazon.com/gp/product/B013PKYILS/ref=ox_sc_act_title_1?smid=A2EFSDTWMPHWEA&psc=1
7. I understand that leaving a lithium battery to trickle charge reduces its life, but if I’m only charging to 3.5 v on these lifePO4 cells, is that still the case? It’s not my plan, but if I can’t cut it off right away, is that a big deal?
8. Looking at the data sheet for something like the Mean Well HLG-150H-36A, it says the constant current region is 18-36v. But the voltage adjustable range is 33-40v. What does that mean for the current output between 36 and 40v? Does that just mean it can’t hold a constant current at that range? The rated current for this model is 4.2A. Does that just mean this will output something less than 4.2 A when adjusted to something above 36 V
Thanks all!
Here are the details:
Battery: 24S1P, Headway 38120HP cells
BMS Purchased, not yet received – JBD 24S, 100A common port smart BMS https://srikobatteries.com/product/jbd-smart-lifepo4-24s-72v-100a-common-port-bluetooth-bms/
1. Is there an existing wiki on how to charge with a power supply?
2. There isn’t a Meanwell power supply with adjustable current and voltage that will go up to the 86.4 volts that I need as far as I can find. Please let me know if i'm wrong.
3. When series connecting an ELG or HLG Meanwell power supply, do I just simply connect the negative DC output from one supply to the positive output of the second power supply?
4. Suppose I want to charge to 3.5V per cell (lifePO4 cells), 3.5 x 24 cells in series = 84V. So I dial the combined voltage of the two series connected power supplies to 84 V. Do I just I check this with a multimeter?
5. When do you decide to pull the plug on the charging process? My understanding, the power supply starts in the constant current phase, and eventually reaches 84 V as the current drops. Do I just keep monitoring the power supply until it drops to about 3 % of the set current? So if the power supplies are set to 4 amps, do I just stop charging when I see the current drop to 0.12 amps?
6. What should I use to monitor the amps in the charging process. Something like this?: https://www.amazon.com/gp/product/B013PKYILS/ref=ox_sc_act_title_1?smid=A2EFSDTWMPHWEA&psc=1
7. I understand that leaving a lithium battery to trickle charge reduces its life, but if I’m only charging to 3.5 v on these lifePO4 cells, is that still the case? It’s not my plan, but if I can’t cut it off right away, is that a big deal?
8. Looking at the data sheet for something like the Mean Well HLG-150H-36A, it says the constant current region is 18-36v. But the voltage adjustable range is 33-40v. What does that mean for the current output between 36 and 40v? Does that just mean it can’t hold a constant current at that range? The rated current for this model is 4.2A. Does that just mean this will output something less than 4.2 A when adjusted to something above 36 V
Thanks all!