Solar Power DC Demand Calculation
        Hours Watt  Days  
DC Load     Watts x Per Hours x Per = Watt Hours
        Day Day Week Week
Amps x Volts = Watts
Inverter Stand By 5 12 60 24.00 1440 0.0 0
Inverter Stand By 2.5 24 60 24.00 1440 3.0 4320
Batery Charger 0.5 12 6   0   0
Batery Charger 0.25 24 6 0.00 0 7.0 0
    12 0   0   0
Propane Alarm 0.21 12 2.52 24.00 60   0
    12 0   0   0
TV 6 12 72   0 7.0  
VCR 1.5 12 18   0 7.0 0
Satelite 4 12 48   0 7.0 0
Sterio 0.8 12 9.6   0 7.0 0
Microwave 100 12 1200   0 7.0 0
Toaster 65 12 780   0 7.0 0
Coffee Maker 80 12 960   0 7.0 0
Blender 12 12 144   0   0
Computer 25 12 300   0 7.0 0
Lap Top 5 12 60   0 7.0 0
Automatic Fan 2 12 24   0   0
Furnace Fan 8 12 96   0   0
Fridge 1 12 12   0   0
Freezer 1 12 12   0   0
        0   0
0.21 12 2.52   0   0
Vaccumm Cleaner   12 0   0   0
Septic Pump   12 0   0   0
Pressure System 4 12 48   0   0
Pressure System   24 0   0   0
Pressure System   48 0   0   0
    0   0   0
DC12V-9V Converter   12 0   0   0
    0   0   0
10 watt lights   12 10   0   0
15 watt lights   12 15   0   0
    0   0   0
      Maximum DC Daily Load 2940    
          DC Weekly Watt Hours 4320
            x
      DC Inefficiency Factor = 1 +   20% 1.20
    20% in most circumstances       =
          Total DC Weekly Load 5184

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Last modified: 09/21/25