New Bafang color display reading incorrect charge%

[Mike Sloan]

When I fully charge my battery (48v/21Ah)...the new Bafang color display (DPC18) only shows 95% charge. Anyway to calibrate the display?

 

[tomjasz]

Use your multimeter and confirm that the battery is actually charging to 54.6 volts.It may not be!

DPC-18 Display documentation - Electricbike.com Ebike Forum

Luna DPC-18 color Display (https://lunacycle.com/luna-full-color-display-dpc-18-for-the-bbs02-and-bbbshd/) (filedata/fetch?id=45577&d=1557358026) Display Features: Full Color Display Automatic Night Mode (with customizable light sensitivity) Choice of Percentage or Voltage...

electricbike.com

 

[Mike Sloan]

Use your multimeter and confirm that the battery is actually charging to 54.6 volts.It may not be!

DPC-18 Display documentation - Electricbike.com Ebike Forum

Luna DPC-18 color Display (https://lunacycle.com/luna-full-color-display-dpc-18-for-the-bbs02-and-bbbshd/) (filedata/fetch?id=45577&d=1557358026) Display Features: Full Color Display Automatic Night Mode (with customizable light sensitivity) Choice of Percentage or Voltage...

electricbike.com

Thanks....I'll check it.

 

[roshan]

Change the display to show you voltage instead of percentage. It's the most accurate way to use that feature on the display.

 

[Mike Sloan]

Change the display to show you voltage instead of percentage. It's the most accurate way to use that feature on the display.

If using "voltage"....how low is ok? Should I not go below 47 volts? I know for lipo packs (quad racing)...I dont go below 3.5v/cell.

 

[Mike Sloan]

If using "voltage"....how low is ok? Should I not go below 47 volts? I know for lipo packs (quad racing)...I dont go below 3.5v/cell.

13 cells × 4.2v = 54.6v...3.5 × 13= 45.5....say 46 volts? Also....this must refer to resting voltage? I would assume the battery has circuitry built in to not allow going below a "damaging voltage".

 

[tomjasz]

Your battery pack should have a proper LVC. (low voltage cutout). My 5 year old 48v pack cuts out at 42V. It's given me great service. I seldom let it get there typically around 44 is where I try to charge from.

 

[Mike Sloan]

Thanks....

 

[roshan]

48V battery discharge chart

 

[Mike Sloan]

48V battery discharge chart

So....ok to take down to 50% voltage (46.8)?

 

[roshan]

So....ok to take down to 50% voltage (46.8)?

That would be ideal

 

[Mike Sloan]

That would be ideal

Thanks