Hi, my load values seems off.
Why is my DC load lower than the AC load?
This changes when the load is above 2kw. Then it shows more DC load than AC as I would expect because of losses.
Is my smart shunt broken?
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Hi, my load values seems off.
Why is my DC load lower than the AC load?
This changes when the load is above 2kw. Then it shows more DC load than AC as I would expect because of losses.
Is my smart shunt broken?
You could check the SmartShunt zero current calibration to rule out that possibility (see the manual on how to do it). Especially if you clicked on the "Calibrate" button at some point.
I'm not sure what I'm looking at in your graphic. Is it showing me that it's pulling power from the battery bank, through the inverter in the MPII and feeding an AC load...like this? I think that's what the little blue traces are showing but it's a small pic and, of course, they not animated in a screencap. :-)
If you're not putting power into the system anywhere else, then yes, these numbers do seem off. I would expect the power draw (from the battery, -153W in this case) to be greater than the output (200W to the AC side) because of inefficiency losses through the inverter. Plus, your batts discharge shows 6 amps. 25.53v x 6a = 153w, so that calculation is right. But the MPII line at the bottom says 25.52v at 9.1a. The calculations are off or the MPII getting a little extra power from someplace that's not being measured. Otherwise, you've just created a perpetual energy machine. ;-)
Your Smart Shunt is not broken, it is simply only very inaccurate. The values depend extremely on the type of load, a 10 USD energy meter is much more accurate. I threw mine away.
Hello,
has anyone solved the problem yet?
I have exactly the same problem.
No, only the Smart Shint you can integrate in Venus (DC), for AC there are some other meters you can use.
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