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Why does my MPPT60 show zero watts, yet solar power is flowing to the battery?

 Why does my MPPT60 show zero watts, yet solar power is flowing to the battery?


Low value shunt resistors measure current flow, however if the battery NEG (-) AND PV (-) are bonded to ground, this will bypass the shunt resistors and show "zero" watts (or a very low wattage), even though much more power is flowing. 


See attached diagram.
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