My WEB3 is connected to the MPPT solar controller with an RS485 serial cable but the current readings are all zero on the MPPT display and in the WEB3 MPPT page.

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The ground between the V- load output on the MPPT solar controller and the TPDIN-Monitor-WEB3 V- needs to be isolated for the MPPT controller to sense the currents properly.

A TP-DCDC-1224 DCDC converter can be used to isolate the power and solve this issue.