Can 2 battery chargers be paralleled for more amp output?

[James340]

I have 13s5p pack that supplied charger takes 10 hours to charge from 45 volt.

 

[Tony01]

Yes, you can parallel chargers to add charging speed as long as the chargers are rated for the same end voltage. However, most regular round cells used in ebike packs are rated for about .5 to .3C charge which means 2 to 3 hour fastest. So whatever your capacity let’s say a 20ah you can usually safely charge up to 10a or half your capacity in amps. You’d have to find out the exact type of cell you have to know what the fastest you can charge it at is.

 

[amberwolf]

it depneds on how the chargers work wheter this will wokr as expected. some cahrgers may turn the output off periodically to check voltage to see if hte batteyr is doing what i should be, and if its' not they may shutdown. since two in parallel like this won't be in sync on that, then usually when one turns off to check the other will still be on and the charger won't read the actual battery voltage at this point, but the higher voltage of the other charger in process. what it does at that point depends on how it's designed and/or setup.

some chargers have no disconnect mechanism in them, so that won't be an issue, but there may be other design considerations tht affect how it charges.

so...it will probably work, but it mght not do it the way you expect, or as fast as you expect.

 

[amberwolf]

I have 13s5p pack that supplied charger takes 10 hours to charge from 45 volt.

how many amps is the suplied charger?

how many amphours is the pack?

a 13s pack at 45v is pretty close to empty, at 3.46v/cell. if it has 3Ah cells in it, then at 5p, that's 15Ah. 10 hours of charging to fill up almost 15ah sounds like a 2A charger.

if it's a higher current charger, it should charge faster, but if the pack has imbalance (very common) because of defective or mismatched cells, it can take a lot longer simply becasue teh bms has to balance the cells as it nears top of charge, and that can take hours, days, or even weeks to complete depending on how bad the imbalance is.

 

[James340]

how many amps is the suplied charger?

how many amphours is the pack?

a 13s pack at 45v is pretty close to empty, at 3.46v/cell. if it has 3Ah cells in it, then at 5p, that's 15Ah. 10 hours of charging to fill up almost 15ah sounds like a 2A charger.

if it's a higher current charger, it should charge faster, but if the pack has imbalance (very common) because of defective or mismatched cells, it can take a lot longer simply becasue teh bms has to balance the cells as it nears top of charge, and that can take hours, days, or even weeks to complete depending on how bad the imbalance is.

Charger "Max 2amp"I don't think it checks voltage.I believe the BMS cuts off& stops charging.I checked amp output at ambient temperature was 1.6@50 volt .I will check after charger warms while charging.

 

[James340]

Yes, you can parallel chargers to add charging speed as long as the chargers are rated for the same end voltage. However, most regular round cells used in ebike packs are rated for about .5 to .3C charge which means 2 to 3 hour fastest. So whatever your capacity let’s say a 20ah you can usually safely charge up to 10a or half your capacity in amps. You’d have to find out the exact type of cell you have to know what the fastest you can charge it at is.

It's 21700 cell.Labeled 4000 mah.I charged 5 hours yesterday from 45 volt to 50 volt.Was 7.8 amh to the battery.

 

[E-HP]

Charger "Max 2amp"I don't think it checks voltage.I believe the BMS cuts off& stops charging.

Then it’s not a charger, it’s a power supply.

 

[James340]

Then it’s not a charger, it’s a power suppl

I will check today if it stops supplying current.I just paralleled 2 battery supply/charger and it is 3 amp.