Diagnosing the problem
There are multiple indicators for a reversed CT-clamp, in general the consumption and import data appear overexaggerated:
- The production and import are equal in the graph (see example 1).
- A site has an import that is higher than the production and a total consumption that is more than double the production. Note that this must be the case for multiple days. (see example 2).
- Note: The consumption value is calculated based on the batteries charge and discharge, and the grid import and export. Therefore if the import value is incorrect, it results in incorrect consumption values.
- You can also tell that the CT direction is reversed by the battery discharge, if the battery discharges a high amount in the morning even though you expect it to be charging due to the sun. Below an example is shown of such a site with an error. (see example 2).
Example 1: Import and consumption are equal, indicating an incorrectly installed CT-clamp.
Example 2: The battery discharges in the morning during expected production times, the consumption value is far higher than expected.
Note that because the CT is reversed it registers all production as import, this results in the high import values and the high consumption values.
Solving the problem
The standard fix is to reverse the direction of the CT-clamp. However, for Solis inverters it is possible to do so via the back-end, this can be done using powershell and the commands below:
- Forward direction:
dbg/cmd/mb/write 1d,6,43029d,1,0 - Reverse direction:
dbg/cmd/mb/write 1d,6,43029d,1,1
Verify the change using:dbg/cmd/mb/read 1d,3,43029d,1
Checking the problem is resolved
Verify whether the data is correct 2-3 days after the CT direction has been switched, on the day itself the dashboard will show very high export data at the moment of the switch. Note that the day the switch is made the dashboard will yield inconsistent data, as seen below.
Issue unresolved?
Is the problem not resolved? This is likely because the CT-clamp is installed wrong rather than reversed. Please refer to the following FAQ's for additional information. [Add FAQ's]