How to Size a Solar Powered DC Power Supplies for SCADA Systems.


Equipment Power Draw Shown in Watts:

40 Watts continuos (24 hours/day) load at 12 Volts DC (VDC)
Equipment Wattage Draw 40 Watts 
Duty Cycle 24 Hours 
40 X 24 = 960 watt-hours (wh/day)

Watt Hours Per Day (wh/day) 960 wh/day
Desired System Voltage 12VDC
960 wh/day /12VDC = 80 amp-hours per day (Ah/day) @ 12VDC


40 Watts continuos (10 hours/day) load at 12 Volts DC (VDC)
Equipment Wattage Draw 40 Watts 
Duty Cycle 10 Hours 
40 X 10 = 400 watt-hours (wh/day)

Watt Hours Per Day (wh/day) 400 wh/day
Desired System Voltage 12VDC
400 wh/day /12VDC = 34 amp-hours per day (Ah/day) @ 12VDC




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