Are Display Watt Consumption inaccurate?

need4spd

100 µW
Joined
Dec 24, 2015
Messages
8
Are they even accurate?
Anybody ever hook a amp meter up to the positive wire from the battery to see how accurate they are?

Device: Sabvoton svmc7245m controller +UKC1 display

If I set controller to 5 amps limit with a 72v battery sitting at 78v the display says 240 watts
If i set controller to 10 amps limit with a 72v battery sitting at 78v the display says 510 watts

Changing any amps limit in the actual display does nothing. It can be at 1amp limit to 15 amp limit it does nothing.

5 amps * 78v = 390watts
10 amps *78v = 780watts


So displayed one is 61% the other is at 65% of what it's supposed to be.
 
I have no experience programming Sabvoton controllers,
but it looks like the shunts/current sensors or the voltage sensing needs calibrated.
 
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