Any issues with going 13S 18650s on 48v controller?

[iangreenhalgh]

Hi folks

I have a pair of 48v battery packs I made using laptop grade sells in a 12s10p config.

My bike uses a pair of 1000w ebay hub motor kits.

The controllers with both motors are identical but I don't know who made them. They are marked 42v LVC.

I am worried about the amount of sag I am seeing on my watt meter, the controllers, despite being marked 28A actually pull 30-31A on full load.

Because these are laptop grade cells, adding a string to make the packs 13S seems a good idea - the BMS I have on each pack (identical BMS boards) are 13S capable - the end wire is simply not connected in the current 12S setup.

I have some spare cells to modify the packs to 13S, but I'm wondering, will the controller handle the higher voltage?

Also, are there any other potential issues I;m overlooking?

 

[DAND214]

13s is high voltage? 13 and 14s is standard for a 48v setup.

Dan

 

[dogman dan]

Go to 14s if you can. But 13s will be fine.

If you are running two motors, you should be running a battery in the 30-40 ah size range. It will still sag like grannies tits adding one more group. To stop the sag, you need better cells, or a whole lot more of them. You need 20P

 

[iangreenhalgh]

I have two 20mah batteries, one for each motor. I have two watt meters, one on each battery/motor so I can monitor things and go 13S if sag proves too much.