jbd bms 12v 4s
- Thread starter papicdu1
- Start date
BentleyJ
Solar Wizard
Could you provide a more detail regarding the model number of the device you are using.
Assuming its looking for the actual shunt resistance, "mR" milliOhms it can be calculated if you know the specifications of the shunt.
For example a 100A, 50mV (0.050V) shunt will have the following resistance according to Ohm's Law. Its important to keep track of the units.
Voltage = Current x Resistance
0.050V = 100 x R: Therefore R = 0.050/100 = 0.0005V: The setup menu is asking for mV not V so the value to input would be 0.5
The same calculation can be run for any shunt as long as the max Current rating and mV output is known.
Edit: The value of 0.15 that is showing on the screen shot you posted would correspond to a 500A, 75mV shunt.
Assuming its looking for the actual shunt resistance, "mR" milliOhms it can be calculated if you know the specifications of the shunt.
For example a 100A, 50mV (0.050V) shunt will have the following resistance according to Ohm's Law. Its important to keep track of the units.
Voltage = Current x Resistance
0.050V = 100 x R: Therefore R = 0.050/100 = 0.0005V: The setup menu is asking for mV not V so the value to input would be 0.5
The same calculation can be run for any shunt as long as the max Current rating and mV output is known.
Edit: The value of 0.15 that is showing on the screen shot you posted would correspond to a 500A, 75mV shunt.
Last edited:
Pierre
Somewhere down South
- Joined
- Dec 21, 2019
- Messages
- 1,137
R is expressed in Ohms , not V. So that line should read : R = 0.050V/100 = 0.0005 Ohms or 0.5mOhms.
yesterday check this shunt resistance and show me 0,0. When connect 50w led bulb on discharge side, app show litlle charge?
Today change this resistance in 0,1 or 0,15 mR.With 0,1 show discharge -5,5a ,power 72w, but real setting led bulb its 2x55w, send pics
Today change this resistance in 0,1 or 0,15 mR.With 0,1 show discharge -5,5a ,power 72w, but real setting led bulb its 2x55w, send pics
what values suggest?
thanks for help, i have litlle question.When its connect discharge side and i connect charger 6a for charging, disconnecting discharge side on aplication but dont work normaly, off/on connecting-disconecting?
yes, i check bms wiring with baterry, all its ok
