ytwytw
New Member
- Joined
- Oct 21, 2019
- Messages
- 112
I currently have the following stuff
Clamp Meter, used by DavidPoz and I think I would take it as the point of truth???
Voltage/Current/Capacity/Coulomb meter 1
Voltage/Current/Capacity/Coulomb meter 2
Ant BMS for my BYD Pack
Recommended by Will as it has bluetooth config + low temp cut-off (very important to me)
MPP Solar LV2424
Problem:
All of the above 4 devices are reporting the same voltage value, but the current value are very different.
When MPP Solar reporting 13Amp, BMS said 14.8Amp, monitor1 said 15.3Amp, monitor2 said 15.8Amp
Clamp meter said 14.6Amp
I did calibrate the hall effect sensor for monitor2, but it seems always 1Amp more than BMS
monitor1 is shunt based current sensor, about always 0.5Amp higher than BMS reported value
MPP Solar always report the lowest current value, maybe it's definitely not accurate?
The clamp meter, I did reset to zero prior to use, but could that be the problem?
Ant BMS does have current calibrate feature, and I did use it when everything is off including all other monitors
I am a bit frustrated now since I am not sure what is correct, and what is incorrect
Because when I am doing capacity test with them, the value for BYD pack could go from 3.5kWh to 3.95kWh
Clamp Meter, used by DavidPoz and I think I would take it as the point of truth???
UNI-T UT210E True RMS AC/DC Current/Voltage Mini Clamp Meters with Capacitance,Resistance Measurement : Amazon.ca: Tools & Home Improvement
UNI-T UT210E True RMS AC/DC Current/Voltage Mini Clamp Meters with Capacitance,Resistance Measurement : Amazon.ca: Tools & Home Improvement
www.amazon.ca
Voltage/Current/Capacity/Coulomb meter 1
Wireless Battery Monitor Voltage Meter Ammeter DC 100V 100A Watt Power Capacity LCD Digital Tester: Amazon.ca: Tools & Home Improvement
Wireless Battery Monitor Voltage Meter Ammeter DC 100V 100A Watt Power Capacity LCD Digital Tester: Amazon.ca: Tools & Home Improvement
www.amazon.ca
Voltage/Current/Capacity/Coulomb meter 2
WINGONEER Wireless Digital DC Voltmeter Ammeter Multimeter, 2.4" LCD Voltage Ampere Power Watt Coulomb Capacity Time Meter Temperature Tester Detector with Hall Sensor & Temp Sensor - 80V 100A : Amazon.ca: Electronics
WINGONEER Wireless Digital DC Voltmeter Ammeter Multimeter, 2.4" LCD Voltage Ampere Power Watt Coulomb Capacity Time Meter Temperature Tester Detector with Hall Sensor & Temp Sensor - 80V 100A : Amazon.ca: Electronics
www.amazon.ca
Ant BMS for my BYD Pack
Recommended by Will as it has bluetooth config + low temp cut-off (very important to me)
MPP Solar LV2424
Problem:
All of the above 4 devices are reporting the same voltage value, but the current value are very different.
When MPP Solar reporting 13Amp, BMS said 14.8Amp, monitor1 said 15.3Amp, monitor2 said 15.8Amp
Clamp meter said 14.6Amp
I did calibrate the hall effect sensor for monitor2, but it seems always 1Amp more than BMS
monitor1 is shunt based current sensor, about always 0.5Amp higher than BMS reported value
MPP Solar always report the lowest current value, maybe it's definitely not accurate?
The clamp meter, I did reset to zero prior to use, but could that be the problem?
Ant BMS does have current calibrate feature, and I did use it when everything is off including all other monitors
I am a bit frustrated now since I am not sure what is correct, and what is incorrect
Because when I am doing capacity test with them, the value for BYD pack could go from 3.5kWh to 3.95kWh