Hi all. im having more or less the same problem.
Synapse 7.2kw offgrid inverter and Revov R9 11.2kwh battery. been working flawlesly for the last 3 months... handling 4.5 hour loadhedding like a champ...and since last night 1.45 hours...same issue... battery voltage to low 44.4v.
did the install localy,and got my mppt seetings from an revov agent in JHB.
testing it now for the last time... seems like the battery drains MUCh quicker now... from 55.5v at float to 48.5v when sounding the alarm,within 1hour 45 min,wit a load of between 950w to 1200w.
use to do that load easely for 4.5 hour during the night...
im clueless at this point