Designed specifically to interact with off-grid renewable energy applications, the EcoGen 6 kW is the first generator intended for alternative energy system standby power. Changes maintenance intervals are extended by an unprecedented five times the industry standard with 500 hours between oil. Shop for Outdoor Power Equipment at The . Integrated smart charging system only charges the battery when necessary, Three position switch allows for automatic, off and manual functions.. It's engineered to easily integrate into an inverter and battery storage system, providing the cleanest running, low emission solution for recharging battery banks.