1600w Hub-4 system installed 24/3/16 by Mobel Technologies in Bourne Lincs, never been monitored or serviced since as they ceased trading soon after! Ticking along ok but I have some issues with battery discharge as they will only ever go to 95% (all 3 modes) even though minimum SOC is set at 60%. Batteries are 2x lead acid in series i.e. 24v. I have full user control.