Hybrid Solar System Guide for Karachi Homes — Cut Your K-Electric Bill by Gaz Size
Complete hybrid solar system guide for Karachi homes. Gaz-by-gaz inverter and battery recommendations from 80 gaz apartments to 1000 gaz farmhouses. SAJ, GoodWe and Elego with K-Electric net metering guide.
20 min read
Karachi has one of the highest solar energy potentials of any major city in the world, with an average of 5.5 peak sun hours per day throughout the year. Yet most Karachi homeowners are still paying some of the highest electricity bills in Pakistan to K-Electric, enduring daily load shedding and watching their monthly costs climb year after year.
A hybrid solar system changes this equation completely. It uses your roof to generate free electricity during the day, stores surplus energy in a lithium battery for the evening load shedding window, and keeps K-Electric as a silent backup for the rare moments when neither solar nor battery can cover your needs.
This guide is written specifically for Karachi. It uses gaz as the property size measurement because that is how Karachi homes are measured, not marla. It references K-Electric, not WAPDA. It accounts for Karachi's coastal climate, monsoon season and the specific load shedding realities that differ by neighbourhood.
By the end of this guide you will know exactly which inverter, how many batteries and how many solar panels your Karachi home needs, based on your property size and the appliances you want to run.
What Is a Hybrid Solar System and How Does It Work?
A hybrid solar system has three jobs running simultaneously and automatically.
During daylight hours from approximately 8am to 5pm, your solar panels generate electricity. The hybrid inverter uses this solar power to run your home directly, your AC, refrigerator, fans, lights and other appliances all run on free solar energy. Any surplus beyond what your home needs at that moment goes into charging your lithium battery.
During the evening load shedding window, typically 6pm to 10pm in Karachi, the grid goes down and your battery takes over. The inverter switches in milliseconds and your home continues running without interruption. Your appliances do not notice the transition.
After your battery covers the 4 hour evening window, K-Electric returns as backup for the late night and early morning hours when load shedding is typically less frequent and solar is not generating.
This three-part cycle repeats every day. Over a month, most Karachi homeowners with a correctly sized hybrid system see their K-Electric bill drop by 60 to 80 percent. The solar panels cover your daytime consumption completely. The battery covers your most expensive and inconvenient outage window. K-Electric only supplies what genuinely cannot be covered by the other two sources.
Know Your Area Before Sizing Your System
Not all Karachi neighbourhoods experience the same load shedding. K-Electric determines load shedding by feeder based on transmission and distribution losses in each area. This affects how you should size your battery.
Low-loss areas (2 to 4 hours daily load shedding):
- DHA (all phases)
- Clifton
- Defence
- PECHS
- Bahadurabad
- Saddar
- KDA Scheme 1
- Gulshan-e-Iqbal (most feeders)
- Gulistan-e-Johar (most feeders)
- Nazimabad
If you live in one of these areas, the 4 hour battery backup strategy in this guide is perfectly matched to your situation. Your battery covers the evening outage window and K-Electric handles the rest.
High-loss areas (8 to 12 hours daily load shedding):
- Malir
- Korangi
- Lyari
- Orangi Town
- Baldia Town
- Surjani Town
- North Karachi (some sectors)
- Landhi
- Shah Faisal Colony
- Liaquatabad
If you live in a high-loss area, a standard hybrid system with 4 hour battery backup will not fully cover your needs. You should read our complete off-grid solar guide for Karachi instead, which covers systems designed for 12 to 24 hour backup independence from K-Electric.
You can check your specific feeder and load shedding schedule through the KE Live app under the Power tab, or by calling K-Electric on 118.
Gaz by Gaz Hybrid Solar System Guide for Karachi
The following recommendations are based on typical Karachi household appliance loads, 5.5 peak sun hours per day and a 4 hour evening battery backup requirement. All inverter sizes include a 20 percent safety margin above your calculated peak load.
80 to 100 Gaz, Apartment or Flat
A typical 80 to 100 gaz Karachi apartment runs the following load simultaneously during the evening load shedding window:
| Appliance | Approximate Load |
|---|---|
| 1 ton inverter AC | 900W |
| Refrigerator | 150W |
| Ceiling fans (3) | 150W |
| LED lights | 50W |
| Television and router | 95W |
| Total simultaneous load | 1345W |
With a 20 percent safety margin, your inverter needs to handle approximately 1600W comfortably. For 4 hours of backup at 1345W average load, you need approximately 5.4kWh of battery capacity.
Recommended system for 80 to 100 gaz:
- Inverter: SAJ H2 6kW Single Phase
- Battery: 1 x 10kWh lithium (coming soon) OR 1 x SAJ EK30 B3 16kWh
- Panels: 10 to 12 panels of 645W (6450Wp to 7740Wp total)
The SAJ H2 6kW is well-suited for apartments with its compact design, easy wall mounting and Wi-Fi monitoring via the eSAJ app. The single phase connection matches the electricity meters in most Karachi apartment buildings.
For battery storage, the SAJ EK30 B3 16kWh gives you 15.2kWh of usable capacity, more than double what you need for 4 hours. This extra capacity means your battery never deep-discharges, extending its lifespan significantly. When our 10kWh battery option becomes available it will be the ideal size for this property type. Contact us via WhatsApp for current availability.
120 Gaz, Small House
A 120 gaz Karachi house typically has a slightly heavier load than an apartment, often including a water pump and washing machine:
| Appliance | Approximate Load |
|---|---|
| 1.5 ton inverter AC | 1400W |
| Refrigerator | 150W |
| Ceiling fans (4) | 200W |
| LED lights | 60W |
| Water pump (intermittent) | 750W |
| Television and router | 95W |
| Total (pump running) | 2655W |
With 20 percent safety margin, inverter needs to handle approximately 3200W. For 4 hours at 2655W average load you need approximately 10.6kWh of battery capacity.
Recommended system for 120 gaz:
- Inverter: SAJ H2 8kW Single Phase
- Battery: 1 x SAJ EK30 B3 16kWh OR 1 x Sunwoda Atrix Max Plus 16kWh OR 2 x 10kWh (coming soon)
- Panels: 12 to 14 panels of 645W (7740Wp to 9030Wp total)
The SAJ H2 8kW handles a 1.5 ton AC, water pump and full household load comfortably within its 8000W rated capacity. The Sunwoda Atrix Max Plus 16kWh is an excellent battery choice for this size home, with 10000 cycle life and built-in casters for easy installation in your utility area or garage.
200 Gaz, Medium House
A 200 gaz Karachi home is one of the most common property sizes in areas like North Nazimabad, Gulshan, Gulistan-e-Johar and PECHS. These homes typically run a heavier load:
| Appliance | Approximate Load |
|---|---|
| 1.5 ton inverter AC (x2) | 2800W |
| Refrigerator | 150W |
| Ceiling fans (5) | 250W |
| LED lights | 80W |
| Water pump (intermittent) | 750W |
| Washing machine (occasional) | 500W |
| Television and router | 95W |
| Total (all running) | 4625W |
With 20 percent safety margin, inverter needs to handle approximately 5500W. For 4 hours at 4625W average load you need approximately 18.5kWh of battery capacity.
Recommended system for 200 gaz:
- Inverter: SAJ H2 8kW or SAJ H2 10kW OR Elego Oyster 6KW (premium coastal)
- Battery: 2 x SAJ EK30 B3 16kWh recommended OR 2 x 10kWh (coming soon) OR 1 x 16kWh minimum
- Panels: 16 to 20 panels of 645W (10320Wp to 12900Wp total)
For a 200 gaz home we recommend the SAJ H2 8kW if your two ACs are both 1 ton, or the SAJ H2 10kW if you run two 1.5 ton ACs. For coastal areas of Karachi such as Clifton, DHA or areas near the sea, the Elego Oyster 6KW with its NEMA 4X corrosion resistance is worth considering for its protection against salt air damage.
The Mesol 16kWh Infiniti is designed specifically for the Pakistani market and pairs well with this system size. Two units in parallel give you 32kWh total, more than enough for 4 hours even at peak load.
240 Gaz, Medium-Large House
A 240 gaz house in areas like DHA Phase 2 to 5, Gulshan Block 13 to 17 or Scheme 33 typically runs a heavier load with larger ACs:
| Appliance | Approximate Load |
|---|---|
| 2 ton inverter AC | 2000W |
| 1.5 ton inverter AC | 1400W |
| Refrigerator | 150W |
| Ceiling fans (6) | 300W |
| LED lights | 100W |
| Water pump (intermittent) | 750W |
| Washing machine (occasional) | 500W |
| Television and router | 95W |
| Total (all running) | 5295W |
With 20 percent safety margin, inverter needs to handle approximately 6400W. For 4 hours at 5295W load you need approximately 21kWh of battery capacity.
Recommended system for 240 gaz:
- Inverter: SAJ H2 10kW Single Phase OR Elego Oyster 10KW (premium)
- Battery: 2 x SAJ EK30 B3 16kWh OR 2 x Sunwoda Atrix Max Plus 16kWh OR 2 x 10kWh (coming soon)
- Panels: 18 to 22 panels of 645W (11610Wp to 14190Wp total)
The SAJ H2 10kW handles the combined load of a 2 ton and 1.5 ton AC alongside full household appliances comfortably. For premium buyers in DHA or Clifton who want AI-driven energy management and the highest weather protection, the Elego Oyster 10KW with IP66 and NEMA 4X dual certification is the best choice for coastal Karachi properties.
Two SAJ EK30 B3 16kWh batteries in parallel give you 32kWh total, 30.4kWh usable, which covers 4 hours at 7.6kW load, providing comfortable headroom above your 5295W peak consumption.
400 Gaz, Large House or Bungalow
A 400 gaz Karachi bungalow in areas like DHA Phase 6 to 8, Clifton Block 4 to 9 or Gulshan Block 1 to 5 typically runs multiple large ACs and heavy household loads:
| Appliance | Approximate Load |
|---|---|
| 2 ton inverter AC (x2) | 4000W |
| 1.5 ton inverter AC | 1400W |
| Refrigerator (large) | 200W |
| Ceiling fans (8) | 400W |
| LED lights | 120W |
| Water pump (intermittent) | 750W |
| Washing machine | 500W |
| Television and router | 95W |
| Total (all running) | 7465W |
With 20 percent safety margin, inverter needs to handle approximately 9000W. For 4 hours at 7465W load you need approximately 30kWh of battery capacity.
Recommended system for 400 gaz:
- Inverter: SAJ H2 12kW Single Phase (single phase meter) OR GoodWe GW12K ET LV (three phase meter)
- Battery: 2 x SAJ EK30 B3 16kWh OR 2 x Sunwoda Atrix Max Plus 16kWh OR 3 x 10kWh (coming soon)
- Panels: 22 to 28 panels of 645W (14190Wp to 18060Wp total)
At 400 gaz the question of single phase versus three phase becomes important. Most Karachi bungalows in this size range have single phase K-Electric connections, in which case the SAJ H2 12kW Single Phase is the right choice. If your property has a three phase industrial meter, the GoodWe GW12K ET LV with its sub-4ms switching time is an excellent commercial grade option.
500 Gaz, Villa or Large Bungalow
A 500 gaz Karachi villa in DHA Phase 7 to 8, Bahria Town Karachi or Clifton is typically a large property with heavy air conditioning load throughout summer:
| Appliance | Approximate Load |
|---|---|
| 2 ton inverter AC (x3) | 6000W |
| 1.5 ton inverter AC | 1400W |
| Refrigerator (large) | 200W |
| Ceiling fans (10) | 500W |
| LED lights | 150W |
| Water pump (intermittent) | 750W |
| Washing machine | 500W |
| Total (all running) | 9500W |
With 20 percent safety margin, inverter needs to handle approximately 11400W. For 4 hours at 9500W load you need approximately 38kWh of battery capacity.
Recommended system for 500 gaz:
- Inverter: GoodWe GW15K ET LV OR SAJ 12KW IP66 Three Phase H3 Series
- Battery: 3 x SAJ EK30 B3 16kWh OR 3 x Sunwoda Atrix Max Plus 16kWh OR 4 x 10kWh (coming soon)
- Panels: 28 to 34 panels of 645W (18060Wp to 21930Wp total)
At 500 gaz most properties benefit from a three phase inverter for balanced load distribution. The GoodWe GW15K ET LV is specifically designed for this property size with 4 independent MPPT trackers and dual battery inputs for faster charging from a larger panel array.
600 to 800 Gaz, Very Large Bungalow
A 600 to 800 gaz property in Karachi is typically a multi-storey bungalow with significant air conditioning, staff quarters and heavy household infrastructure:
| Appliance | Approximate Load |
|---|---|
| 2 ton inverter AC (x4) | 8000W |
| 1.5 ton inverter AC (x2) | 2800W |
| Refrigerator (x2) | 300W |
| Ceiling fans (12) | 600W |
| LED lights | 200W |
| Water pump (x2, intermittent) | 1500W |
| Washing machine | 500W |
| Total (all running) | 13900W |
With 20 percent safety margin, inverter needs to handle approximately 16700W. For 4 hours at 13900W you need approximately 55kWh of battery capacity.
Recommended system for 600 to 800 gaz:
- Inverter: GoodWe GW20K ET LV OR SAJ H2 20kW Three Phase
- Battery: 4 x SAJ EK30 B3 16kWh OR 4 x Sunwoda Atrix Max Plus 16kWh OR 5 x 10kWh (coming soon)
- Panels: 34 to 42 panels of 645W (21930Wp to 27090Wp total)
Properties in this size range almost certainly have three phase K-Electric connections. The GoodWe GW20K ET LV delivers 20kW of three phase output with dual battery inputs at 208A each for very fast battery charging from a large panel array. The SAJ H2 20kW Three Phase is the alternative, with up to 10 units in parallel if your energy needs grow over time.
1000 Gaz and Above, Large Farmhouse or Commercial Property
Properties of 1000 gaz and above in Karachi are large farmhouses, commercial villas or mixed-use properties with electrical loads that vary significantly based on usage. Standard sizing guides cannot cover these properties accurately.
For 1000 gaz and above we strongly recommend a detailed load assessment before sizing any solar system. Contact MartOnline via WhatsApp with the following information and we will design a custom system for your property:
- Your property size in gaz
- Number and size of all ACs
- Other heavy appliances
- Whether your meter is single or three phase
- Your current monthly K-Electric bill
- Your load shedding hours per day
Use our solar calculator as a starting point, then contact us for a complete custom system design.
Solar Panels for Karachi, What You Need to Know
Karachi receives an average of 5.5 peak sun hours per day, making it one of the best cities in Pakistan for solar generation. This is higher than Lahore at 5.0 hours and Islamabad at 4.8 hours, meaning your panels generate more electricity per day in Karachi than in most other Pakistani cities.
Best panel orientation for Karachi:
Panels should face south at a tilt angle of 10 to 15 degrees for maximum annual generation in Karachi. Most Karachi rooftops are flat concrete, making this orientation straightforward to achieve with standard mounting structures.
Monsoon season impact:
During July to September, Karachi's monsoon season reduces solar generation by 20 to 30 percent due to cloud cover and dust on panels after rain. Your system is sized for average annual conditions, so monsoon months will see slightly lower generation. Your battery and K-Electric backup cover the difference.
Summer heat and panel performance:
Solar panels lose approximately 0.4 percent of output for every degree Celsius above 25 degrees. During Karachi's summer when rooftop temperatures can reach 60 to 70 degrees Celsius, panels may produce 15 to 20 percent below their rated output. This is accounted for in the panel counts recommended in this guide through the 645W panel sizing and system oversizing.
Why 645W panels:
We recommend 645W monocrystalline panels throughout this guide because they deliver maximum output from a limited Karachi rooftop area. Larger panels mean fewer panels for the same total wattage, reducing installation complexity and roof space requirements.
Battery Options for Your Karachi Home
MartOnline stocks lithium LiFePO4 batteries in multiple sizes to match different property types and budgets.
16kWh LiFePO4, current standard:
The SAJ EK30 B3 16kWh is the most popular battery size for Karachi homes. With 15.2kWh of usable capacity and over 8000 cycle life, it provides reliable backup for medium to large homes. Plug-and-play compatible with SAJ H2 inverters via CAN protocol.
The Sunwoda Atrix Max Plus 16kWh offers 10000 cycle life, 25 percent more than the SAJ battery, and built-in casters for easy installation. Compatible with all major inverter brands via CAN 2.0 and RS485.
The Mesol 16kWh Infiniti is designed specifically for the Pakistani market with 10kW maximum discharge power and 6000 cycle life. A practical locally supported option for Karachi homes.
10kWh LiFePO4, coming soon:
A 10kWh battery is ideal for 80 to 120 gaz apartments and smaller homes where a full 16kWh is more capacity than needed for 4 hours of backup. Contact MartOnline via WhatsApp for availability and pricing.
5kWh LiFePO4, coming soon:
A 5kWh battery suits very small apartments or can be combined in multiples for flexible capacity building. Contact MartOnline via WhatsApp for availability and pricing.
K-Electric Net Metering in Karachi
Net metering allows you to export surplus solar electricity to K-Electric's grid and receive credits on your monthly bill. When your solar panels generate more than your home needs, typically in the late morning and early afternoon, the excess flows back to K-Electric and your meter runs backwards.
Which inverters qualify for K-Electric net metering:
All hybrid inverters sold by MartOnline meet NEPRA's technical requirements for net metering including anti-islanding protection and grid compliance. K-Electric accepts grid-tied hybrid inverters with proper grid protection features.
The K-Electric net metering application process:
The application is made to K-Electric directly and involves a technical inspection of your solar system, meter replacement with a bidirectional meter and connection approval. The process typically takes several weeks from application to approval. Your solar installer handles the paperwork in most cases.
Expected monthly savings from net metering:
For a 200 gaz home with a 10kW solar system in Karachi generating approximately 55 units per day, and consuming approximately 30 units per day during daylight hours, the surplus of 25 units per day earns approximately 750 units per month in net metering credits, representing a significant reduction in your monthly bill on top of the daytime solar savings.
Which Solar Brand Is Right for Your Karachi Home
SAJ H2 Series, Best Value Across All Sizes
The SAJ H2 series covers 6kW to 20kW in both single phase and three phase configurations, making it the most comprehensive range for Karachi homes of any size. The LS2 series handles single phase residential properties while the LT2 series handles three phase commercial and large residential properties.
Read our detailed reviews: SAJ H2 6kW review, SAJ H2 8kW review, SAJ H2 10kW review
Crown Micro Elego Oyster, Premium for Coastal Karachi
For properties in DHA, Clifton, Defence and other coastal areas of Karachi where salt air from the Arabian Sea accelerates corrosion in electronic equipment, the Elego Oyster 6KW and Elego Oyster 10KW carry dual IP66 and NEMA 4X certification, the highest corrosion resistance available in any hybrid inverter in Pakistan. The 10 year standard warranty and AI energy management make it the premium choice for coastal Karachi properties.
Read our detailed reviews: Elego Oyster 6KW review, Elego Oyster 10KW review
GoodWe ET LV Series, For Three Phase Properties
For 400 gaz and above properties with three phase K-Electric connections, the GoodWe GW12K, GoodWe GW15K and GoodWe GW20K ET LV series offer sub-4ms switching speed, true UPS-level performance, with dual independent battery inputs and 4 MPPT trackers for large rooftop arrays.
Not Sure About Your System Size? Use Our Solar Calculator
Every Karachi home is different. If you are unsure about your peak load, battery requirement or panel count, use our free solar calculator. Enter your appliances and load shedding hours and get an exact recommendation from our live product inventory in under 2 minutes.
Need a Professional Installer in Karachi?
MartOnline supplies the equipment. For professional installation in Karachi, Matrix Technologies offers solar energy installation services through their energy division at matrixtechnology.net.pk/Energy. Contact us via WhatsApp and we connect you with the right installation team for your property.
Frequently Asked Questions
What size solar inverter do I need for a 200 gaz house in Karachi?
For a typical 200 gaz house in Karachi running two 1.5 ton ACs, a refrigerator, water pump, fans and lights, we recommend an 8kW to 10kW single phase hybrid inverter depending on your total simultaneous load. The SAJ H2 8kW is sufficient if your combined AC load is two 1 ton units. Step up to the SAJ H2 10kW if you run two 1.5 ton ACs simultaneously. Always add 20 percent above your calculated peak load to handle AC compressor startup surges without the inverter tripping. Use our solar calculator for a precise recommendation based on your exact appliance list.
How many hours of battery backup does a hybrid system give in Karachi?
A hybrid solar system for Karachi is designed to provide 4 hours of battery backup, enough to cover the typical evening load shedding window from 6pm to 10pm. The exact backup duration depends on your battery capacity and your load during the outage. For a 200 gaz home with two 16kWh batteries running a 4kW evening load, backup duration is approximately 7.5 hours. If you are in a high-loss K-Electric area with 8 to 12 hours of daily load shedding, a standard hybrid system may not be sufficient and our off-grid solar guide is more appropriate for your situation.
Can I get K-Electric net metering with a hybrid solar system in Karachi?
Yes. All hybrid inverters sold by MartOnline are compatible with K-Electric's net metering program and meet NEPRA's technical requirements. Net metering allows you to export surplus solar energy to K-Electric's grid and receive credits on your monthly bill. The application is made directly to K-Electric and involves a technical inspection, meter replacement and connection approval. The process takes several weeks. Your solar installer typically handles the paperwork. Net metering is most beneficial for properties that generate significant surplus during midday hours when solar generation peaks and household consumption is lower.
Is a hybrid solar system worth it in low-loss K-Electric areas like DHA and Clifton?
Yes, even in low-loss K-Electric areas where load shedding is only 2 to 4 hours daily, a hybrid solar system is worthwhile primarily for the daytime electricity savings rather than just the backup. Your solar panels eliminate your daytime K-Electric consumption completely, which typically represents 40 to 60 percent of your total monthly bill. The battery backup is an additional benefit that covers the evening outage window. Together, most Karachi homeowners in low-loss areas see their monthly K-Electric bills reduce by 60 to 80 percent after installing a correctly sized hybrid system.
What is the difference between a hybrid solar system and a UPS in Karachi?
A UPS only stores grid electricity in a battery and charges from K-Electric. It provides backup during load shedding but offers no solar generation and no bill savings. Your electricity costs remain the same with a UPS. A hybrid solar system connects solar panels, a battery bank and K-Electric simultaneously. During daylight hours it runs your home on free solar energy and charges the battery with surplus. During load shedding the battery provides backup. Your monthly bill drops significantly because solar covers most of your daytime consumption. The hybrid system costs more upfront but the bill savings pay back the investment over time, whereas a UPS only costs money to run with no savings benefit.
Which battery is best for a hybrid solar system in Karachi?
The best battery for a Karachi hybrid system depends on your inverter and budget. For SAJ H2 inverters, the SAJ EK30 B3 16kWh is the natural plug-and-play pairing with automatic CAN communication and over 8000 cycle life. For buyers who prioritise the longest possible battery life, the Sunwoda Atrix Max Plus 16kWh offers 10000 cycles and is compatible with all major inverter brands. The Mesol 16kWh Infiniti is designed specifically for the Pakistani market and offers a locally supported option. For smaller apartments, 10kWh and 5kWh options are coming soon, contact us via WhatsApp for availability and pricing.