The EFOY Pro charges batteries fully automatically. The integrated charge controller permanently monitors the charge level of 12 and 24 V batteries. When the battery voltage drops below a predefined level, the EFOY Pro starts automatically and switches off again once the battery is charged. This results in reliable, continuous power, reduces the amount of batteries needed and extends the lifetime of the batteries since deep discharge damages are prevented. Via an inverter, you can also operate 230 V devices. The EFOY Pro produces electricity from the fuel in the fuel cartridges and oxygen from the air. In operation, the only by products are waste heat and water vapor containing an insignificant amount of carbon dioxide. It is extremely eco-friendly.