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Solar Power System Design Calculation Sheet
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Step 1: Example Calculation
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For a 5kW solar system, here is an example of input values and calculations:
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ParameterExample ValueFormula UsedEditable Formula UsedFormula Used
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Solar Panel Specifications5000.0
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Number of Panels161616.0Total Power Required / Panel Power
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Panel Power Output (W)320W-320
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Panel Efficiency (%)18%-18
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Panel Area (m²)1.6m²-1.6
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Total Panel Area (m²)25.6m²25.625.6No. of Panels * Panel Area
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Solar Irradiance (W/m²)1000 W/m²-1000.0
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Short circuit Current of array ( A)2525.0
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Power Output Calculation
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Total Power Required (W)5000W-5000.0
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Total Panel Power Output (W)5120W51205120.0Panel Power * No. of Panels
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Total Power Output (kW)5.12kW5.125.12Total Power (W) / 1000
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System Losses (%)15%-15.00
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Net System Output (kW)4.35kW4.3524.352Total Power * (1 - Loss Factor)
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Energy Generation Calculation
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Daily Sun Hours (h)5 hours-5.0
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Daily Energy Production (kWh)21.75 kWh21.7521.76Net System Output * Sun Hours
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Monthly Energy Production (kWh)652.5 kWh652.5652.8Daily Energy * 30
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Annual Energy Production (kWh)7938.75 kWh7938.757942.4Daily Energy * 365
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Battery Bank Calculation
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Battery Storage Capacity Required (kWh)
10 kWh-25.5-
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Battery Voltage (V)48V-48.0-
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Required Battery Capacity (Ah)208 Ah208.33530Battery Storage * 1000 / Voltage
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Number of Batteries4 (52 Ah each)411.0Battery Capacity / Battery Size
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Battery Efficiency (%)90%-90.00-
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Battery DOD (%)95%95.00
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Back-up Time (H)5.00
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Inverter Selection
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Load Demand (kW)5kW-5.0-
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Total Load Demand per Day (kWh)25 kWh2525.0Load Demand * Sun Hours
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Inverter Efficiency (%)95%-95.000-
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Total Inverter Load Capacity (kW)5.26 kW5.2635.263Load Demand / Inverter Efficiency
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Solar to Load Ratio0.870.870.87Daily Energy / Load Demand
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Control Panel Parameter
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Inverter Breakar Rating (A)122
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Load Breakar Rating (A)104
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array Breakar Rating (A)31
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Reference 5kWhttps://bluebirdsolar.com/cdn/shop/files/72_Cells_poly_300-340_Mono_375-400.pdf?v=14776835530941479529
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