How many A protection plates are suitable for 48v 50AH lithium battery used in 800w motor?

80A.

1. The protection board should be selected according to the engine power and battery voltage. The main types of batteries are the same (ternary or iron-lithium cannot be mixed), operating voltage (there is). 13 strings/14 strings of ternary lithium batteries (usually 13 strings, but 14 strings are also a lot), 15 strings/16 strings lithium iron (usually 16 strings)), rated current.

2. Therefore, 48V lithium battery for 800W motor and 80A protection board for 50Ah motor are suitable.