I have ordered two Meanwell S-350-48's and was planning on running two in series and bringing the voltage down on both to 41 volts.
Pack is 20s LiPo. 5A 1C charge 82 volt is 410Watt..not 350..is that driving them too hard or can they cope?
I understand that for current limiting..one board is fine. But what about the voltage.
What range of control will this board give?
Can I leave one PSU at 48 and bring all the voltage down with the board on the other?
Or easier to just buy and use two boards? or mod one with a multi turn pot to bring voltage down, and then do fine control with the other PSU with the board?
To complicate things...I am hoping to use these PSU's in two rolls. In series as above at 82 volt...4 or 5 amp, and also occasionally for a balance charge in parallel as a 38 volt PSU to drive a iCharger 3010b 1000W balance charger.
How can I achieve this as well the initial charging in series?
410watts should be okay, but you may want to tune it closer to 350W. The board voltage is dependant on the zener diode used. If less than 24V, no diode is neccessary. I think you can derive the rest of the answer to part 1, from page 1 of this thread:
fechter wrote:El_Steak wrote:So for a 100V solution (4 x S-350-24) this would not work?
It would work, but could run out of compliance if the pack was really dead. If you installed limiter boards on two of the 4 supplies, it would have more compliance.
I'll try to explain differently: At 100v the supply with the limiter can only drop by about 10v when the current tries to exceed the set point. This still leaves you with 90v, which might give you more than the desired current and throw things into hiccup mode. You could also run the risk that one supply shuts down and gets fed in reverse by the other ones (causing failure). This would not necessarily be the supply that has the limiter board on it. All of these things would only happen if the pack voltage was significantly below 90v.
As for part 2, not sure if you can lower the 350-48 down to 38V. Seems a bit much, but I could be mistaken. Also, running two 350W units at 500W each to get 1000W is not a good idea. I'd go for 3 units in this case.