For critical loads or greater power needs, we use a hybrid combination of solar power, wind and/or fuel cells.
The prime source of power will always be solar, meaning, when solar is available it will charge the batteries as much as it can. In the event that solar cannot keep up, this is where the fuel cells come into play. There is a preset range that the fuel cell monitors the battery bank. When the battery bank reaches the low voltage, the fuel cell turns on and charges the battery bank until the battery bank has reached its fully charged state. At this point the fuel cell ramps down and continues to monitor the battery bank until it is needed again.