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Voltage SAC \Drop


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My solar system consist of 3 MPP Solar LV5048 inverters, a rolls battery bank, Victron BMV 702 and ICC software .

Now I have a 48V battery bank with a capacity of 890 AH consisting of 16x 6V Rolls Lead Acid Batteries (Model S6 L16-HC). These batteries are pretty new as they have been manufactured last October and I have been utilizing them as of January the 1st. My problem know is that get a lot of voltage sac\drop  while draining the batteries at approx. 40A.  For example att 70%SOC and a discharge current  of 40A  the voltage of the battery bank reaches 44V (this value is measured both directly at the battery bank as well as at the inverter). This Voltage sac\drop prevents me from draining my batteries to a SOC lower then 70% as at 44V the inverter switches me back to GRID.


Any idea what could be causing this and how I can have it corrected?


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