It doesn't matter if the solar is the only charging source.
The trouble is those AHs "in" are not all for the battery when you run loads with the solar "extra" once the batts accept less than what the solar can do, such as in the afternoon.
So you cannot get the battery SOC from the AHs "in"; you would think the batts are more full than they are.
Plus--the AHs "in" include some for heat loss. The Trimetric allows 4% for heat when showing the AH count on recharging. The solar controller would not have that built-in adjustment.
So that is two ways the AH count on the solar controller will be too high for the battery's SOC.
