How to Size Your Solar System for MEPCO
Transitioning to solar power in Pakistan is the most effective way to beat rising electricity tariffs. Our Solar System Size Calculator takes the guesswork out of net metering by determining exactly what size inverter and how many panels you need to bring your MEPCO D Bill down to zero. You can view your current units by doing a MEPCO Bill Check Online.
The Calculation Formula
To accurately size a solar system, we do not just look at your raw unit consumption. Solar systems are not 100% efficient due to heat, smog, dust, wiring, and inverter losses. NREL's PVWatts model uses 14% as a default system-loss assumption, while many Pakistan homes should also test a 20-25% planning buffer for dust and high temperatures.
Daily Units = Monthly Units ÷ 30Target Generation = Daily Units ÷ (1 - System Loss %)System Size (kW) = Target Generation ÷ Average Sun Hours (4.5) Net Metering in Pakistan
Net metering allows you to export excess solar energy back to the MEPCO grid during the day, and use grid energy at night. At the end of the month, MEPCO calculates the net difference.
- Minimum System Size: Currently, NEPRA guidelines state that net metering requires a minimum 3kW system.
- 3-Phase Connection: You must have a 3-phase electricity connection to qualify for a green meter. If you have a single-phase meter, you must upgrade it first.
- Peak Hours: Units exported during off-peak hours cannot be offset against units consumed during peak hours (usually 6 PM to 10 PM in summer). You still have to pay for peak hour consumption unless you have batteries.
Official Source Checks
Choosing the Right Inverter
Once you have your required kW from the calculator, you need to choose an inverter:
On-Grid Inverter
The cheapest option. It syncs with the grid and supports net metering. However, it shuts down entirely during load shedding. You will have no power when the grid is off.
Hybrid Inverter
The best option for Pakistan. It supports net metering AND connects to batteries. During load shedding, it seamlessly shifts your house to battery and solar power.
Frequently Asked Questions (FAQs)
Do I need batteries if I get net metering? ▼
No, batteries are not required for net metering. An On-Grid inverter without batteries will sync with the MEPCO grid, export excess power, and offset your bill. However, when load shedding occurs, your solar system will immediately shut down for safety reasons, leaving you without power.
How much space do solar panels take? ▼
As a general rule of thumb, you need about 80 to 100 square feet of shadow-free roof space per Kilowatt (kW) of solar installed. A 10kW system typically requires about 800 to 1,000 square feet of roof space.
Will solar eliminate my MEPCO bill entirely? ▼
Solar can eliminate the cost of the units you consume (resulting in zero units billed). However, you will still have to pay fixed monthly charges, such as the PTV fee and meter rent, which usually amount to a few hundred rupees.