Solar Load & System Cost Calculator

Estimates required solar panel, inverter, and battery capacity from your appliance load, then calculates total installed system cost — for houses and buildings in Pakistan.

Planning estimate only: peak sun hours, system losses, and component prices vary by city, season, roof condition, and brand. All defaults below are editable. Actual quotes from installers can differ ±10–15% from this bottom-up estimate — use this to size your system and sanity-check quotes, not as a final purchase price.

Appliance Load

System Type

On-Grid (Net Metering)

Hybrid (Grid + Battery)

Off-Grid (Battery Only)

System Parameters

Peak Sun Hours (PSH) Pakistan average: 4.5–6.5 hrs/day. Karachi ~5.5, Faisalabad summer ~6.5.

System Derating Factor (%) Accounts for inverter/wiring losses, dust, temperature. Typical: 75–80%.

0 kWh

Daily Energy Need

0 kW

Required Panel Capacity

Rs. 0

Total System Cost

System Components

Component

Quantity

Unit Price (PKR)

Cost (PKR)

Formula Reference

Daily Energy Need (kWh) = Σ (Appliance Watts × Quantity × Hours/day) ÷ 1000
Required Panel Capacity (kW) = Daily Energy ÷ (Peak Sun Hours × Derating Factor)
Inverter Size (kW) = Total Connected Load (kW) × 1.25 safety margin
Battery Capacity (kWh) = (Daily Energy × Days of Autonomy) ÷ (Depth of Discharge × Round-trip Efficiency)

Typical Appliance Wattages (2026, Inverter-Type)

Inverter AC (1.5 ton)	~1,200 W
Inverter Refrigerator	~120 W
LED Bulb	~10 W
Ceiling Fan	~75 W
Washing Machine	~500 W
Water Pump/Motor	~750 W

Inverter (non-solar-inverter-type) appliances typically draw 30–40% more power — always check the actual label rating for your device.

Component pricing reflects general Pakistan market ranges as of 2026 (Tier-1 monocrystalline panels, standard hybrid/on-grid inverters, lithium batteries) and fluctuates with USD/PKR exchange rate and global panel pricing. This tool provides a bottom-up sizing and cost estimate for planning purposes — always get a professional site survey (roof orientation, shading, structural load capacity) and itemized installer quotes before purchase. Net metering/net billing terms are set by NEPRA and your local DISCO and may affect system economics. For customized calculators tailored to your organization, please contact Impact Tech Solutions.