Calculate Your Solar Load
Add appliance rows, adjust quantities and hours, and watch your recommended system size update live. Presets use realistic Pakistani running averages not flat foreign figures.
Pakistani Appliance Wattage Reference Table
Wattages vary by brand and age check the rating plate on the appliance, usually on the back or inside the door.
| Appliance | Typical wattage | Typical hrs/day | Daily units (kWh) |
|---|---|---|---|
| Ceiling fan (standard) | 80W | 12 | 0.96 |
| Ceiling fan (inverter/DC) | 35W | 12 | 0.42 |
| LED bulb | 10W | 6 | 0.06 |
| 1.5-ton inverter AC | 1,000-1,400W avg | 8 (summer) | ~10.4 |
| 1.5-ton non-inverter AC | 1,800-2,200W | 8 (summer) | ~14 |
| Refrigerator (medium) | 150-300W (cycling) | 24 | 1.2-1.8 |
| Deep freezer | 200-300W | 24 | 1.5-2.0 |
| LED TV 43" | 80W | 5 | 0.4 |
| Water pump (1 HP) | 750W | 1 | 0.75 |
| Washing machine | 400W | 1 | 0.4 |
| Iron | 1,200W | 0.5 | 0.6 |
| Wi-Fi router + CCTV | 30W | 24 | 0.72 |
Load Calculation for a Solar System The Manual Method
Prefer to verify by hand? The load calculation takes three formulas, then a panel count.
= kWh (units)
= total kWh/day
(~4-5 units/day per kW)
(550W panels), round up
Worked Example: 3-Bed House in Karachi
One 1.5-ton inverter AC for 8 hours (10.4 units), four fans for 12 hours (3.8), twelve LEDs for 6 hours (0.7), fridge (1.5), TV (0.5), 1 HP pump for an hour (0.75), iron and washing machine (1.0). Total ≈ 18.7 units/day. Divide by 4.5 → 4.2kW → round up to a 5kW system, 9-10 × 550W panels, leaving headroom for a second AC in peak June-August heat. That rounding up is deliberate: K-Electric’s summer demand is exactly when panels also derate from heat.
Why a Solar System Load Calculator Beats Guesswork
The most common sizing mistake in Pakistan isn’t arithmetic it’s averaging. A load calculator forces you to confront the seasonal split: your December load might be 8 units/day while June touches 25 because of AC hours. Size only for winter and summer bills come roaring back; size for absolute peak and you over-invest.
The tool recommends a size against your weighted annual profile, then shows which loads to shift to daytime (washing machine, pump, iron) so self-consumption stays high under net billing. It also flags whether your peak watts need a single-phase or 3-phase inverter a detail that changes hardware cost and is missed in nearly every WhatsApp quote.
Got your total load? Take the numbers straight into a free instant quote Zynergy has sized 1,000+ systems since 2021, rated 4.9★ by 100+ customers.
Solar Load Calculator FAQs
Add each appliance’s watts × hours per day, divide by 1,000 for daily units, then divide by 4.5 for system kW. Our calculator does all three steps instantly.
Whatever covers your daily units most 3-bed Pakistani homes with one AC land at 5kW; two-AC homes typically need 7-10kW. Enter your appliances to get an exact figure.
An inverter model adds roughly 8-11 units per day at 8 hours’ use; a non-inverter unit adds 12-16. That single appliance usually doubles a home’s summer load.
Around 20-25 units a day: one inverter AC, fans, lights, fridge, TV and a water pump. It won’t run two ACs simultaneously through the inverter unless sized for that peak.
Calculate both the tool asks for AC months separately. Sizing on the summer figure with net metering credits covering winter surplus is usually the best-value approach.
Only if your peak load exceeds roughly 7-8kW or your existing connection is already 3-phase. The calculator flags this automatically from your appliance list.
Pumps, freezers and non-inverter ACs briefly draw 2-3× their rated watts at startup. Your inverter needs surge capacity above your running load the recommendation accounts for it.
For sizing panels, no but if you face daily outages, run the battery sizing calculator next to add backup for essential loads.
Completely no sign-up, results on screen instantly. A custom quote with a free site survey is optional at the end.
Turn your numbers into a real quote.
Take your load figure straight into a free instant quote Zynergy has sized 1,000+ systems since 2021, rated 4.9★ by 100+ customers.