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Disclaimer: This tool is provided for preliminary estimating purposes only. Results are not a substitute for professional engineering analysis.
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Please consult a licensed Professional Engineer for final system sizing, code compliance, and construction documents.
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Please download to be able to edit (click File then download).
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How to size your Solar System
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Please edit values in bold blue only, results are in bold red.
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For best results, please enter the first and second dates to cover whole years or x amount of years.
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Enter First Date of meter reading:
11/26/2019
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Enter First Meter Reading:
64942.000kWH
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Enter Second Date of meter reading:
11/25/2020
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Enter Second Meter Reading:
74534.000kWH
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Results:
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This is your total kWH per time-period above:
9592.000
kWH per x of days (kWH = Kilo Watt Hour, = Power x Time, = Energy)
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This is the number of days represented above:
365x
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This is your average per day
26.279kwH per day
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Enter daily peak-equivalent solar hours in your area:
5.5Hours per day
https://www.karrittech.net/tools
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Solar system AC size, without AC losses:
4.778kW AC
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Percentage Loss at Inverters:
1.00%
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Percentage Loss at Transformers:
1.50%
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Percentage Loss due to voltage drop:
2.00%
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Estimated Losses from Solar Inverters to Meter:
4.435%
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Minimum Solar system AC size total:
5.000
kW AC in total inverter nameplate.
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What DC/AC ratio do you want to use?
1.25
Typical: Ground mount: 1.25, Roof mount: 1.32, Complex Roof mount: 1.4
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may use slightly higher DC/AC ratios for Areas with lower Solar Hours than 5.5 hrs/day,
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may also use slightly lower DC/AC ratios for Areas with higher Solar Hours per day.
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DC/AC ratio is limited by the inverter/module specs.
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This is your solar system size, in DC, for Module Total:
6.250
kW DC (For Modules)
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Reverse Calculation, from kWatts AC to kWH per Year
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Av. / PeakAv. / Peak
Est. Line Losses
Output kWh
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kW AC perNumber ofTotal Nameplate
Solar Hours
Solar Hours
AC LossAC LossAc Loss due
From Solar Site
kilo-Watt-hours
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InverterInverterskW ACPer DayPer Year
At Inverter
At Transformers
to Voltage Drop
To Meterper Year
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515.0005.5002,0081.00%1.50%2.00%4.435%9,592.307
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