⚙ CircuitSecrets
Solar Energy Calculator Dashboard
Complete engineering suite for solar panel output, system sizing, battery backup, inverter design, string configuration, and ROI calculations.
Calculator 01
Solar Panel Daily Output
E = P_panel × N × PSH × η_system [kWh/day]
Calculation Results
Total Wp
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Daily Output
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Monthly kWh
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Annual kWh
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Temp Derating
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Effective Wp
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CO₂ Saved/yr
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Calculator 02
Solar System Size
System kW = Daily kWh / (PSH × η) | Panels = System kW / Panel kW
Calculation Results
System Size (kW)
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With Margin (kW)
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No. of Panels
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Inverter Size
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Calculator 03
Battery Bank Sizing
Ah = (kWh × 1000) / (V_bank × DoD × η_inv) | Batteries = Ah / Ah_per_battery
Calculation Results
Total kWh Needed
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Total Ah Required
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No. of Batteries
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Series / Parallel
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Calculator 04
Inverter Sizing
Inverter kVA = Total Load (W) / (PF × η) | Add 25% surge capacity
Calculation Results
Min. Inverter (kW)
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With Surge (kW)
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Recommended (kVA)
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Output Current (A)
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Calculator 05
Solar String Design
Vstring = Voc × N_series | Istring = Isc × N_parallel | Check Vstring ≤ Inverter Vmax
Calculation Results
String Voc (V)
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String Vmp (V)
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Array Isc (A)
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Array Imp (A)
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Total Panels
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Array Power (kWp)
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Voc Check
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Calculator 06
ROI & Payback Period
Payback = Total Cost / Annual Saving | ROI% = (Annual Saving / Cost) × 100
Calculation Results
Annual Saving
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Simple Payback
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ROI %
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25-yr Saving
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Calculator 07
Tilt & Shading Loss
Optimal Tilt ≈ Latitude ± 15° | Output Factor = cos(|tilt − optimal|) × (1 − shade%)
Calculation Results
Optimal Tilt
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Tilt Loss
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Shading Loss
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Output Factor
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Daily Output (kWh)
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Annual Output (kWh)
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Calculator 08
Net Metering & Grid Export
Net Import = Grid Import − Grid Export | Saving = Export×FiT + Import Avoided×Tariff
Calculation Results
Self-Consumed
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Grid Export
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Grid Import
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Net Bill Saving/mo
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Calculator 09
Solar Cable Sizing
A = (ρ × 2L × I) / VD_allowed [mm²] | VD ≤ 1% DC, ≤ 3% AC
Calculation Results
Calc. Area (mm²)
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Std. Cable Size
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Actual VDrop
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VDrop %
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Calculator 10
Solar All-in-One Summary
Complete off-grid / on-grid system snapshot from your daily load & site conditions
Calculation Results
System Size (kW)
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No. of Panels
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Inverter (kW)
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Battery Ah
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No. of Batteries
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Annual kWh
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Annual Saving
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Payback (yrs)
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CO₂ Saved/yr (kg)
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25-yr Saving
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Calculator 11
Solar Water Pumping
P_hydraulic = (ρ × g × Q × H) / (3.6×10^6) | Pump HP = P_hyd / η_pump
Calculation Results
Hydraulic Energy
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Required Pump HP
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Solar Array (kWp)
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No. of Panels
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Data Management
Saved Setups (Update / Edit)
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