Overview
☀️
Calculators
10
🔋
System Types
On/Off Grid
⚡
Phase Support
DC / AC
🌍
Standard
IEC 61215
Calculators
🔆
Solar Panel Daily Output
Energy generation from panel specs & sun hours
E = P_panel × N × PSH × η_system [kWh/day]
Total Wp
—
Daily Output
—
Monthly kWh
—
Annual kWh
—
Temp Derating
—
Effective Wp
—
CO₂ Saved/yr
—
📐
Solar System Size
Required kW / panel count from load
System kW = Daily kWh / (PSH × η) | Panels = System kW / Panel kW
System Size (kW)
—
With Margin (kW)
—
No. of Panels
—
Inverter Size
—
🔋
Battery Bank Sizing
Capacity, Ah & battery count for backup
Ah = (kWh × 1000) / (V_bank × DoD × η_inv) | Batteries = Ah / Ah_per_battery
Total kWh Needed
—
Total Ah Required
—
No. of Batteries
—
Series / Parallel
—
🔄
Inverter Sizing
Required inverter kVA / kW rating
Inverter kVA = Total Load (W) / (PF × η) | Add 25% surge capacity
Min. Inverter (kW)
—
With Surge (kW)
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Recommended (kVA)
—
Output Current (A)
—
⛓️
Solar String Design
Series / parallel string configuration
Vstring = Voc × N_series | Istring = Isc × N_parallel | Check Vstring ≤ Inverter Vmax
String Voc (V)
—
String Vmp (V)
—
Array Isc (A)
—
Array Imp (A)
—
Total Panels
—
Array Power (kWp)
—
Voc Check
—
💰
ROI & Payback Period
Investment return, savings & break-even
Payback = Total Cost / Annual Saving | ROI% = (Annual Saving / Cost) × 100
Annual Saving (৳)
—
Simple Payback
—
ROI %
—
25-yr Saving (৳)
—
🌤️
Tilt & Shading Loss
Optimal tilt angle & output loss estimation
Optimal Tilt ≈ Latitude ± 15° | Output Factor = cos(|tilt − optimal|) × (1 − shade%)
Optimal Tilt
—
Tilt Loss
—
Shading Loss
—
Output Factor
—
Daily Output (kWh)
—
Annual Output (kWh)
—
🔌
Net Metering & Grid Export
Import/export balance & bill saving
Net Import = Grid Import − Grid Export | Saving = Export×FiT + Import Avoided×Tariff
Self-Consumed
—
Grid Export
—
Grid Import
—
Net Bill Saving/mo
—
🔗
Solar Cable Sizing
DC string cable & AC cable size
A = (ρ × 2L × I) / VD_allowed [mm²] | VD ≤ 1% DC, ≤ 3% AC
Calc. Area (mm²)
—
Std. Cable Size
—
Actual VDrop
—
VDrop %
—
🏡
Solar All-in-One Summary
Complete system design: Load → System size → Battery → Inverter → ROI → CO₂ saving
Complete off-grid / on-grid system snapshot from your daily load & site conditions
System Size (kW)
—
No. of Panels
—
Inverter (kW)
—
Battery Ah
—
No. of Batteries
—
Annual kWh
—
Annual Saving (৳)
—
Payback (yrs)
—
CO₂ Saved/yr (kg)
—
25-yr Saving (৳)
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