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richard horsey avatar image
richard horsey asked

SmartShunt Charged energy does not match Solar yield from the Victon MPPTs

Trying to understand where all my solar yield is going .

Basically SmartShunt Charged energy does not match Solar yield from the Victon MPPTs.

Any input/advice greatfully recieved.


24 hours ago the smartshunt history tab stated:

Cumulative Ah drawn:-2579Ah

Discharged energy: 32.5kWh

Charged energy: 38.5kWh


Now it states:

Cumulative Ah drawn:-2736Ah

Discharged energy: 34.4kWh

Charged energy: 40.3kWh


The differences for the last 24 hours gives:

Cumulative Ah drawn:-157Ah

Discharged energy: 1.9kWh (similar to above as this is159Ah at 12V)

Charged energy: 1.8kWh


My 3x MPPTs state combined for yesterday they produced 3.36kWh


The manual states that Charged energy is: The total amount of energy absorbed by the battery in kWh.

Does this mean that my Victon AGMs (a little on the older side) are losing 1.56kWh per 24 hours in charging efficiency? ie a loss of 47%...

Or am i not understanding properly?

thanks

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1 Answer
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

The SmartShunt doesn't count the energy that is directly used by any load connected to the system.

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richard horsey avatar image richard horsey commented ·
thanks but do you mean the smartshunt will not count the energy of any load that is not connected to the batteries via the smartshunt?


everyrhing is going through the smartshunt so therefore it should record the energy used?

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chrigu avatar image chrigu richard horsey commented ·
If you installed the smart shaunt as per the instructions, then it is located between the battery negative and everything else, MPPTs, inverters, DC-loads.


If your MPPT charges with 10A but you also have a 10A DC-load, then theres nothing flowing trough the shunt to be measured by it
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richard horsey avatar image richard horsey chrigu commented ·
thanks. smartshunt installed as per instructions.


ok so now i have been reminded of the obvious that the smartshunt measures what goes in and out ot the batteries and any loads that are powered from the solar during the day wont be measured by the shunt.

so in conclusion the 1.56kWh that I thought was missing and not being recorded by the shunt is being used by the loads and lost in charging efficiency.




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