I had 4 x GDSUPER (GD-6FM200(12V200Ah) batteries installed about 6 months ago for my emergency system during load shedding. They were never overloaded (Max load was 400W). They are now down to less than 50% of their capacity after a load check and they do not even last 4 hours. Currently only a A++-rated Bosch fridge & 4 x 5 Watt LED lights are used. Tonight it barely lasted through the 4-hour loadshedding session. I have a SOLAREJC 3kVA inverter and 4 x CSUN 330W solar panels (type CSUN330-72P)
Anyone with similar experience on the quality of the GDSUPER brandname?