Water Generator Project Update

Scope and Requirements The objective of this project is to provide water for drinking and cooking in places where access to water is limited. A dehumidifier is operated using solar panels and rechargeable batteries to condense water vapor in the atmosphere. In this phase of testing, our intent is to establish a methodology assess the performance of the system, as well as put a data acquisition system in place to enable remote monitoring over time.

Hardware Used

  • Axpert KS 1 KVA Inverter: The inverter used in our project can be connected to different monitoring and control systems via serial port. It uses MPPT to manage solar panel output, and provides pure sine wave AC output using DC input from the batteries.
  • Laptop
  • RS-232 to USB cable
  • RS-232(male) to RJ-45 cable
  • Belin BL-830E 330W 30 liter 220V dehumidifier
  • Five solar panels of 150W each from Mono Select China
  • Two 12V rechargeable Gel batteries from Narada. Each battery is 100Ah capacity
  • Circuit breakers
  • Mounting stands 14G adjustable
  • 7mm to 10mm wire – thickest wire is between charge controller output and battery input

The picture of some of the hardware is shown below

Axpert 1KVa Pure Sine Wave Inverter and MPPT Charge Controller


RS 232 male to Cat6 connector for inverter
RS 232 female to USB cable plugs into laptop

System Connections The five solar panels are connected in series, and the batteries are also connected in series. The schematic is shown below:

Power Consumption The power consumption of the dehumidifier is shown in the table below. Clearly, the power during startup of compressor will be highest, and will fall a bit during steady-state operation. The particular dehumidifier cuts-off at 40% relative humidity.


Mar 2018