Inverters; Accumulators; Batteries and battery chargers; Digital switching systems comprised of interconnected electromechanical and solid-state power management enclosures with standard and custom keypads for user remote control, the foregoing for use on marine helms and land-based vehicle dashboards; Dry cells and batteries; Electric accumulators; Inverters for power supply; Monitoring devices for monitoring battery performance characteristics; Off-grid power and deep cycle battery storage ...