Solar Powered Utility Unit

A method to control a utility unit wherein the utility unit comprises:

• a battery;
• a solar collector electrically coupled to the battery;
• a first energy-drawing utility;
• a second energy-drawing utility;
• and an electronic control unit electronically coupled to the battery and the first and second utilities to manage energy stored in the battery, the method comprising:
• estimating an amount of energy stored in the battery;
• estimating a time for a next charging event;
• estimating a first energy draw by the first utility until the next charging event;
• and
• switching off power to the second energy-drawing utility when the first energy draw exceeds the estimated energy stored in the battery.

A purification system, comprising:

• an upper reservoir;
• a purifier coupled to the upper reservoir by a first tube with an upper valve between the purifier and the upper reservoir;
• and
• a lower reservoir coupled to the purifier by a second tube with a lower valve between the purifier and the lower reservoir wherein:
• a lowest portion of the upper reservoir is located above a highest portion of the purifier;
• a highest portion of the lower reservoir is located below a lowest portion of the purifier;
• and
• a volume of the purifier is substantially less than a volume of both a volume of the upper reservoir and a volume of the lower reservoir.