Van Electrical - Solar Requirements
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Power Needs
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ItemWattageVoltsNo. Hours DailyWhWhy?AmpsHoursAh
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AC Needs
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Macbook Pro851643405.3125421.25
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Macbook 5014.521003.426.9
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iPad105.11102.012.0
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Phone 1 Charge
125.12242.424.7
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Phone 2 Charge
1852363.627.2
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Portable Speaker
852161.623.2
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Smart Watch1251122.412.4
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Camera Charger
88.4180.951.000.95
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Internet Router5.91910590.31247.45
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208.9
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DC Needs
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Fridge401224? only 8?500
https://www.amazon.com/TruckFridge-TF130-Refrigerator-Commercial-Vehicles/dp/B01J0WQ4CG/ref=sr_1_17?ie=UTF8&qid=1492745850&sr=8-17&keywords=12V+fridge
6.008.0040.00
per factory note
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LED Lights8124320.674.002.67
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Water Pump90120.19
http://blog.rvshare.com/12v-rv-water-pump/
7.50.10.75
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Fan241261442612
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579.810.084615381290111.4348976
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Amps (watts/12V)
107.5
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FormulasExample:
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Amps = Watts/Volts
85W / 16V = 5.3A
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Amps*Volts = Watts
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Volts = Amps * Watts
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V*Ah=WHr
12V*200Ah = 2400WHr or 2.4KWHr.
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Note
Battery should not be depleted past 50%. Wise to stay well above that.
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A more detailed formula
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SolarPanelsTotalPower=((BatteryVoltage)∗(BatteryAh)∗(1−StateofCharge)/(ChargeDurationinhours))∗(1+Losses)
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Solar Panel Sizing
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Panels (W)
Battery Size (Ah)
Usable AhAmps (V/W)Daylight
Full Charging Time (hours)
Normal Charging Time
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300W array
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30020010025484
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300300150254126
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300400200254168
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400W array
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40020010033.33333333463
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40030015033.33333333494.5
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40040020033.333333334126
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In summaryWhy?
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Ah300
To safely not deplete my bank down past 70% on a regular basis, 300Ah makes sense for my ~100Ah-110Ah needs
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Battery Bank300
I went with three batteries in parallel due to cost savings.
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70% discharged
210
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50% discharged
150
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Array Size300
Total W from solar package selected
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Sun Hours (average)
5
Used sun hours chart found to the right
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Amps/hr23
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Hours to charge
4.347826087
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