Help build a 100v bulk charger

[abahanad]

Hello all.

I am building a 6s4p battery pack out of lipo bricks
Each lipo is 10ah and could take 15c charging.
I went all around but i am pretty bad with this i need help from the creative ES community.
The pack will give a max on 100.8 volts, nominal of 88.8.
I would like a variable output, so lets say i choose to go with 5s4p,
Something fast ? I would love to charge the pack in less than an hour but i want to be real, anything less than 3 hours is perfect.
I will be balancing the packs individually every now and then.
Could you lead me in the right way?
If there is a ready made charger i will get it if it wasnt so expensive.

Thank you.

 

[amberwolf]

You could series a couple of Meanwell HLG-600H-54A series LED PSUs.

If you need more than 11-12A charging current, you can then parallel a second series set of them.

But you'll also want to stay right there and watch the charging the whole time, and use cell-voltage-monitors for HVC alarms on each parallel cell group, as at that high a charging current, if a cell begins to overcharge, you could end up with "LiPo Drama" if catastrophic failure happens in the cell.


However, if you charge a 6s pack to 100v, that's going to be nearly 17v per cell, which is pretty much guaranteed to be quite a fire.

If you use a 5s pack at 100v, it's even worse at 20v. But neither one will actually charge that high before it bursts into flames, most likely.

 

[999zip999]

You need to get your P parallel and S series right. Its a 24s we are talking about ?
Start here https://endless-sphere.com/forums/viewtopic.php?f=31&t=87300&hilit=Book#p1274916

 

[cal3thousand]

I'm guessing that he's using 4S packs, so his 6S is really (6S of 4S) = 24S

I'm also assuming that he's talking about a 40Ah pack as well (4p of 10Ah)

And also in this case 5S of 4S would be 20S.

So he wants a 20S to 24S capable charger that will charge 40Ah in less than an hour. So something like a 4kW charger. I kind of doubt this will work. 4kW of power at 110VAC is 36A+ and his circuit breaker is gonna pop.

Honestly, I would go with the Mean Wells. If you series two 48 V chargers, you'll get 20S to 24S capability. And if Mains power is no issue, you could conceivably get to the current levels you want using these: https://www.alliedelec.com/mean-well-usa-rsp-3000-48/70069615/

 

[amberwolf]

I'm guessing that he's using 4S packs, so his 6S is really (6S of 4S) = 24S

Ah; that makes more sense than what he actually said.

So he wants a 20S to 24S capable charger that will charge 40Ah in less than an hour. So something like a 4kW charger. I kind of doubt this will work. 4kW of power at 110VAC is 36A+ and his circuit breaker is gonna pop.

With individual isolated charger strings, paralleled together only at the outputs, they can be plugged into different circuits--so if the house is like US houses with two phases, then one set of chargers could be plugged into one circuit, and another set of them could be plugged into another, adn the outputs paralleled into the pack.

However, the HLGs can run on 240vac or 110vac IIRC, so if he's got a stove or dryer outlet, those could output enough current to run 8 HLG-600H-54A units, four paralleled pairs of 2 in series, for 44-48A output at up to 108VDC+. Each one would take in around 3A at 230VAC, so around 12A out of the breaker.

http://www.mouser.com/ds/2/260/HLG-600H-SPEC-806212.pdf


As you note, there are also other models that will work; I like these cuz they're weatherproof and vibrationproof (compared to open-cage types) and fanless, so they can be carried around and used even outdoors.

Cost, though...that's high.