What kind of power supply should I need for 5S2P X2 in series with a 10A chrage? 42V 20A?
2-5a should suffice I recommend 2a for cell longevity
OK then Iāll get lower ampere, but is it 42V? same voltage as the full state of battery? Or could I get a lower V one?
You want to match full voltage either charge 5s2p is not 42v though
What I meant is, as I wasnāt clear, that there are 4 packs, 2X 5S in series and those two are in parallel to other 2 packs. So 42V ?
Ok, that would be a 10s2p and 42v charge. Power supplies come either 30v max or 60v max so youāll need a 60v power supply with CC/CV output. A 60v 10a CC/CV power supply would be very expensive. I recommend a 60v 5a which is what I use and it works just fine.
Is this considered expansive? Or should I stay away from those products at that price point?
Thatās the wrong type of power supply.
This is what I use. Adjustable voltage and current. Constant Current/Constant Voltage https://www.amazon.com/dp/B00G0HAY3U/ref=cm_sw_r_cp_apip_gVQX1iuDemiIz
I use this one for my 10s battery pack:
Thank you both, but Stan won for the competitive pricing
Iām considering charging them in series, I was thinking about making a switch, or perhaps using my anti spark switch if possible to manipulate batteries status from parallel to series. Much like this switch: http://www.instructables.com/id/SIMPLE-ParallelSeries-Select-Switch/
What do you guys think?
Please guys, I need to know if it makes sense so I can purchase the correcr BMS, should I go with 10S BMS and parallel charge or 20S with a higher voltage PSU and a switch, is it safe?
I think a switch like that wonāt last 1 day if you switch it under power.
12s is the limit for the motors and controllers that we use.
Maybe I didnāt explain myself as well as I wanted. This switch is ONLY after I disconnect the batteries from the motors (powering down the system), and it is only for charging, not to be consumed by the motors. A fail safe mechanism may be in order. 10S in parallel when riding, 20S when charging.
How do you purpose to balance charge a 20s battery?
With a 20S BMS. It was proposed by Lucy from Bestech.
So your going to connect the bms to charge and disconnect it to ride ?
I didnāt think about that, you are right, Iād need to disconnect the BMS before powering up the system.
For parallel charging the lipos the best and most effective way is to use a nice charger and a good, beefy PSU. I use the ISDT SC620, 20A charger and a ex-server 500W PSU (small, light and around 40A@12V charging capabilities). I can charge 2x 4S 5000 mAh in under 30 minutes from like 3.7V per cell to full charge at 4.2V - thatās in parallel @ 10A. In case of 3x 4S 5000 mAh setup Iāll just ramp the amps up to 15A and get the same charging time. Itās gold.
The popular belief is that itās not good to fast charge lithium batteries, especially Lipos.