Off-Grid Solar System Guide for Karachi — Complete K-Electric Independence by Gaz Size
Complete off-grid solar system guide for Karachi homes. Achieve full K-Electric independence with gaz-by-gaz system sizing from 80 gaz apartments to 1000 gaz farmhouses. Built for high-loss areas in Karachi.
24 min read
If you live in Malir, Korangi, Lyari, Orangi Town, Baldia, Surjani Town, Landhi or any other high-loss area of Karachi where K-Electric cuts power for 8 to 12 hours every day, a standard hybrid solar system with 4 hours of battery backup is not enough. You need something more fundamental, a system that makes K-Electric irrelevant.
An off-grid solar system gives you complete energy independence. Your home runs entirely on solar panels and battery storage. K-Electric becomes something you no longer think about. No scheduled load shedding. No unannounced outages. No monthly bill climbing every quarter. Your electricity comes from your roof, stored in your batteries, available whenever you need it.
This guide is written for Karachi homeowners who are done waiting for K-Electric to improve. It uses gaz as the property size measurement because that is how Karachi homes are measured. It names your neighbourhoods specifically. It gives you exact system sizes, battery counts and panel numbers for your property, not generic advice that ignores the realities of life in Karachi.
If you are in a low-loss K-Electric area like DHA, Clifton or PECHS with only 2 to 4 hours of daily load shedding, our hybrid solar system guide for Karachi may be a more cost-effective solution for your situation. This guide is for homeowners who need 12 to 24 hours of daily energy independence.
Is Off-Grid Solar Right for You?
Before sizing your system, be honest about which category describes your situation.
You need an off-grid system if:
- Your area faces 8 or more hours of K-Electric load shedding daily
- You live in a high-loss feeder area with unpredictable unannounced cuts
- Your K-Electric bill is high and you want to eliminate it completely
- You have a generator that you are tired of running and paying for
- You want complete peace of mind regardless of what K-Electric does
High-loss areas in Karachi where off-grid makes the most sense:
- Malir and Malir Cantt
- Korangi and Korangi Industrial Area
- Lyari
- Orangi Town
- Baldia Town
- Surjani Town
- North Karachi (high-loss sectors)
- Landhi
- Shah Faisal Colony
- Liaquatabad
- Keamari
- Gadap Town
A hybrid system is sufficient if:
You live in DHA, Clifton, PECHS, Gulshan, Gulistan-e-Johar or other low-loss areas with 2 to 4 hours of daily load shedding. Read our hybrid solar system guide for Karachi for a more cost-effective solution.
You can confirm your feeder category and load shedding schedule through the KE Live app under the Power tab, or by calling K-Electric on 118.
How an Off-Grid Solar System Works
An off-grid solar system operates on a simple principle: your roof generates electricity and your batteries store it. K-Electric plays no role whatsoever.
During daylight hours from approximately 7am to 5pm, your solar panels generate electricity at full capacity. The hybrid inverter operating in off-grid mode uses this solar power to run every appliance in your home simultaneously. Any surplus beyond your current consumption goes directly into charging your battery bank.
During the evening and night hours when solar generation stops, your battery bank takes over completely. A correctly sized off-grid system has enough battery capacity to power your home from sunset to the following sunrise, typically 14 to 16 hours in Karachi, without any external power source.
The following morning, as soon as the sun rises, your panels begin generating again and the cycle restarts. Your battery recharges throughout the day so it is full again by the time the sun sets.
A generator connects to the inverter's generator input port as an emergency backup only. In a correctly sized off-grid system, the generator should rarely need to run, only during extended overcast periods lasting 3 or more consecutive days, which are uncommon in Karachi's climate.
The fundamental difference from a hybrid system is this: in an off-grid system your battery must cover the entire night, approximately 14 hours, not just the 4 hour evening peak. This requires a significantly larger battery bank and a larger solar panel array to fully recharge that battery every day.
Components of a Complete Off-Grid Solar System
An off-grid system has more components than a standard hybrid setup. Understanding each component helps you have informed conversations with installers and ensures nothing is missed.
Hybrid Inverter (off-grid capable)
All SAJ H2 series, Elego Oyster and GoodWe ET LV inverters sold by MartOnline support off-grid operation mode. The inverter is the brain of the system, managing power flow between solar panels, battery bank, home appliances and the generator input.
Battery Bank
The most critical sizing decision in an off-grid system. Your battery bank must store enough energy to power your home from sunset to the following sunrise. This requires 3 to 6 or more batteries depending on your property size and consumption, compared to 1 to 2 batteries in a hybrid system.
Solar Panel Array
An off-grid panel array must be large enough to both run your home during the day AND fully recharge a large battery bank before sunset. This typically requires 30 to 50 percent more panels than a hybrid system of the same inverter size.
Generator Input
Every off-grid installation should include a generator connection as emergency backup. The inverter accepts generator power and uses it to charge the battery bank when solar generation is insufficient during extended cloudy weather.
Earthing System
Mandatory for every solar installation in Pakistan and especially critical for off-grid systems. Proper earthing protects your inverter, batteries and home from lightning strikes and electrical faults. Never accept an installation without a verified earth connection.
Surge Protection Devices
Karachi experiences lightning strikes during the monsoon season from July to September. Surge protection devices protect your inverter and batteries from voltage spikes. Type 2 SPDs on the DC side protect the solar string inputs. Type 2 SPDs on the AC side protect the inverter output.
DC and AC Circuit Breakers
DC breakers protect each solar string input. AC breakers protect the inverter output to your distribution board. Correctly rated breakers are not optional, undersized breakers are a fire risk.
Changeover Switch
A manual or automatic changeover switch manages the transition between your solar system and your emergency generator. An automatic transfer switch starts the generator automatically when battery levels fall below a set threshold and switches back to solar automatically when the battery recovers.
Contact MartOnline via WhatsApp for availability and pricing on all solar accessories including SPDs, circuit breakers and changeover switches.
Gaz by Gaz Off-Grid Solar System Guide for Karachi
The following recommendations are based on typical Karachi household daily energy consumption, 5.5 peak sun hours per day in Karachi and a battery bank sized to cover 14 to 16 hours of night-time operation. All systems include a 50 percent battery buffer above calculated daily consumption to handle cloudy days and avoid deep discharge.
80 to 100 Gaz, Apartment or Flat
Daily energy calculation for 80 to 100 gaz apartment:
| Appliance | Load | Hours/day | Daily Energy |
|---|---|---|---|
| 1 ton inverter AC | 900W | 8 hrs | 7.2kWh |
| Refrigerator | 150W | 24 hrs | 3.6kWh |
| Ceiling fans (3) | 150W | 12 hrs | 1.8kWh |
| LED lights | 50W | 6 hrs | 0.3kWh |
| Television and router | 95W | 6 hrs | 0.57kWh |
| Total daily energy | 13.47kWh |
Battery bank needed: 13.47 x 1.5 = 20.2kWh minimum
Recommended off-grid system for 80 to 100 gaz:
- Inverter: SAJ H2 6kW Single Phase
- Battery: 2 x SAJ EK30 B3 16kWh (32kWh total, 30.4kWh usable)
- OR: 3 x 10kWh (coming soon, 30kWh total)
- OR: 4 x 5kWh (coming soon, 20kWh total)
- Panels: 10 to 14 panels of 645W (6450Wp to 9030Wp)
- Generator: 3kVA minimum for emergency backup
Two SAJ EK30 B3 16kWh batteries in parallel give 30.4kWh of usable capacity, more than enough to cover 14 hours of apartment load at 1345W average consumption, with comfortable reserve for cloudy days.
120 Gaz, Small House
Daily energy calculation for 120 gaz house:
| Appliance | Load | Hours/day | Daily Energy |
|---|---|---|---|
| 1.5 ton inverter AC | 1400W | 8 hrs | 11.2kWh |
| Refrigerator | 150W | 24 hrs | 3.6kWh |
| Ceiling fans (4) | 200W | 12 hrs | 2.4kWh |
| LED lights | 60W | 6 hrs | 0.36kWh |
| Water pump | 750W | 1 hr | 0.75kWh |
| Television and router | 95W | 6 hrs | 0.57kWh |
| Total daily energy | 18.88kWh |
Battery bank needed: 18.88 x 1.5 = 28.3kWh minimum
Recommended off-grid system for 120 gaz:
- Inverter: SAJ H2 8kW Single Phase
- Battery: 2 x Sunwoda Atrix Max Plus 16kWh (32kWh total)
- OR: 2 x SAJ EK30 B3 16kWh
- OR: 3 x 10kWh (coming soon)
- Panels: 14 to 18 panels of 645W (9030Wp to 11610Wp)
- Generator: 5kVA minimum for emergency backup
The SAJ H2 8kW handles the 1.5 ton AC and all household loads comfortably while simultaneously charging the battery bank during the day. Two batteries give 30.4kWh usable, sufficient for 16 hours at 1888W average load with good reserve.
200 Gaz, Medium House
Daily energy calculation for 200 gaz house:
| Appliance | Load | Hours/day | Daily Energy |
|---|---|---|---|
| 1.5 ton inverter AC (x2) | 2800W | 8 hrs | 22.4kWh |
| Refrigerator | 150W | 24 hrs | 3.6kWh |
| Ceiling fans (5) | 250W | 12 hrs | 3.0kWh |
| LED lights | 80W | 6 hrs | 0.48kWh |
| Water pump | 750W | 1.5 hrs | 1.13kWh |
| Washing machine | 500W | 1 hr | 0.5kWh |
| Television and router | 95W | 6 hrs | 0.57kWh |
| Total daily energy | 31.68kWh |
Battery bank needed: 31.68 x 1.5 = 47.5kWh minimum
Recommended off-grid system for 200 gaz:
- Inverter: SAJ H2 10kW Single Phase OR Elego Oyster 10KW (coastal areas)
- Battery: 3 x SAJ EK30 B3 16kWh (48kWh total, 45.6kWh usable)
- OR: 3 x Sunwoda Atrix Max Plus 16kWh
- OR: 5 x 10kWh (coming soon)
- Panels: 18 to 22 panels of 645W (11610Wp to 14190Wp)
- Generator: 7.5kVA minimum for emergency backup
Three SAJ EK30 B3 16kWh batteries give 45.6kWh of usable capacity, sufficient for 14 hours at 3168W average load. The SAJ H2 10kW runs two 1.5 ton ACs simultaneously while charging three batteries during the day, a demanding but achievable task with 22 panels of 645W generating 14.2kWp.
For coastal Karachi properties in areas affected by salt air, the Elego Oyster 10KW with dual IP66 and NEMA 4X certification is the premium choice for long-term corrosion resistance.
240 Gaz, Medium-Large House
Daily energy calculation for 240 gaz house:
| Appliance | Load | Hours/day | Daily Energy |
|---|---|---|---|
| 2 ton inverter AC | 2000W | 8 hrs | 16.0kWh |
| 1.5 ton inverter AC | 1400W | 8 hrs | 11.2kWh |
| Refrigerator | 150W | 24 hrs | 3.6kWh |
| Ceiling fans (6) | 300W | 12 hrs | 3.6kWh |
| LED lights | 100W | 6 hrs | 0.6kWh |
| Water pump | 750W | 1.5 hrs | 1.13kWh |
| Washing machine | 500W | 1 hr | 0.5kWh |
| Television and router | 95W | 6 hrs | 0.57kWh |
| Total daily energy | 37.2kWh |
Battery bank needed: 37.2 x 1.5 = 55.8kWh minimum
Recommended off-grid system for 240 gaz:
- Inverter: SAJ H2 12kW Single Phase
- Battery: 4 x SAJ EK30 B3 16kWh (64kWh total, 60.8kWh usable)
- OR: 4 x Mesol 16kWh Infiniti
- OR: 6 x 10kWh (coming soon)
- Panels: 22 to 26 panels of 645W (14190Wp to 16770Wp)
- Generator: 10kVA minimum for emergency backup
Four batteries give 60.8kWh usable, more than sufficient for 16 hours at 3720W average load with comfortable reserve. The SAJ H2 12kW is SAJ's most powerful single phase inverter and handles the combined 2 ton plus 1.5 ton AC load alongside all household appliances without any issues.
400 Gaz, Large House or Bungalow
Daily energy calculation for 400 gaz bungalow:
| Appliance | Load | Hours/day | Daily Energy |
|---|---|---|---|
| 2 ton inverter AC (x2) | 4000W | 8 hrs | 32.0kWh |
| 1.5 ton inverter AC | 1400W | 8 hrs | 11.2kWh |
| Refrigerator (large) | 200W | 24 hrs | 4.8kWh |
| Ceiling fans (8) | 400W | 12 hrs | 4.8kWh |
| LED lights | 120W | 6 hrs | 0.72kWh |
| Water pump | 750W | 2 hrs | 1.5kWh |
| Washing machine | 500W | 1.5 hrs | 0.75kWh |
| Television and router | 95W | 6 hrs | 0.57kWh |
| Total daily energy | 56.34kWh |
Battery bank needed: 56.34 x 1.5 = 84.5kWh minimum
Recommended off-grid system for 400 gaz:
- Inverter: GoodWe GW12K ET LV (three phase) OR SAJ 12KW IP66 Three Phase H3 Series
- Battery: 6 x SAJ EK30 B3 16kWh (96kWh total, 91.2kWh usable)
- OR: 6 x Sunwoda Atrix Max Plus 16kWh
- OR: 9 x 10kWh (coming soon)
- Panels: 28 to 34 panels of 645W (18060Wp to 21930Wp)
- Generator: 15kVA minimum for emergency backup
At 400 gaz the daily energy consumption crosses 50kWh, requiring a large six-battery bank and a substantial panel array. Most Karachi bungalows of this size are best served by a three phase inverter for balanced load distribution. The GoodWe GW12K ET LV with its sub-4ms switching and dual battery inputs handles this system size efficiently.
500 Gaz, Villa or Large Bungalow
Daily energy calculation for 500 gaz villa:
| Appliance | Load | Hours/day | Daily Energy |
|---|---|---|---|
| 2 ton inverter AC (x3) | 6000W | 8 hrs | 48.0kWh |
| 1.5 ton inverter AC | 1400W | 8 hrs | 11.2kWh |
| Refrigerator (x2) | 300W | 24 hrs | 7.2kWh |
| Ceiling fans (10) | 500W | 12 hrs | 6.0kWh |
| LED lights | 150W | 6 hrs | 0.9kWh |
| Water pump | 750W | 2 hrs | 1.5kWh |
| Washing machine | 500W | 1.5 hrs | 0.75kWh |
| Television and router | 95W | 6 hrs | 0.57kWh |
| Total daily energy | 76.12kWh |
Battery bank needed: 76.12 x 1.5 = 114kWh minimum
Recommended off-grid system for 500 gaz:
- Inverter: GoodWe GW15K ET LV OR SAJ H2 20kW Three Phase
- Battery: 8 x SAJ EK30 B3 16kWh (128kWh total, 121.6kWh usable)
- OR: 8 x Sunwoda Atrix Max Plus 16kWh
- OR: 12 x 10kWh (coming soon)
- Panels: 36 to 44 panels of 645W (23220Wp to 28380Wp)
- Generator: 20kVA minimum for emergency backup
A 500 gaz off-grid system is a significant investment but delivers complete energy independence for a large Karachi villa. Eight batteries at 121.6kWh usable capacity provide generous overnight coverage with buffer for consecutive overcast days. Contact MartOnline via WhatsApp for a custom quotation on systems of this scale.
600 to 800 Gaz, Very Large Bungalow
Estimated daily energy: 90 to 120kWh
Battery bank needed: 135 to 180kWh minimum
Recommended off-grid system for 600 to 800 gaz:
- Inverter: GoodWe GW20K ET LV OR SAJ H2 20kW Three Phase
- Battery: 10 to 12 x SAJ EK30 B3 16kWh or Sunwoda Atrix Max Plus 16kWh
- OR: 14 to 16 x 10kWh (coming soon)
- Panels: 44 to 54 panels of 645W
- Generator: 25kVA minimum
Properties of this size require a detailed load assessment before finalising the system design. Contact MartOnline via WhatsApp with your complete appliance list, daily usage hours and current monthly K-Electric bill for a custom off-grid system quotation.
1000 Gaz and Above, Farmhouse or Large Commercial Property
Off-grid systems for 1000 gaz and above properties are custom commercial-grade installations that go beyond standard product configurations. These systems may require multiple inverters in parallel, very large battery banks of 200kWh or more, and large ground-mounted or roof-mounted panel arrays.
Contact MartOnline via WhatsApp with your property details for a complete custom off-grid system design. Provide the following:
- Property size in gaz
- Complete appliance list with daily usage hours
- Current monthly K-Electric bill
- Whether a generator is already on site
- Budget range
Use our solar calculator as a starting point for your load estimate before contacting us.
Generator Integration for Off-Grid Systems
Every off-grid solar installation should include a generator as an emergency backup, even if you never plan to use it regularly. Here is why and how it works.
Why every off-grid system needs a generator:
Karachi's monsoon season from July to September brings extended overcast periods where solar generation drops by 20 to 30 percent for multiple consecutive days. A correctly sized off-grid system handles 1 to 2 overcast days comfortably on battery reserve. But a 3 to 5 day stretch of heavy cloud cover, which does occur during severe monsoon seasons, can drain even a large battery bank.
A generator connected to the inverter's generator input port charges the battery bank automatically when solar generation falls below a threshold you set. This ensures your home never loses power even in the worst monsoon conditions.
What size generator do you need:
| Property Size | Minimum Generator Size |
|---|---|
| 80-120 gaz | 3 to 5 kVA |
| 200-240 gaz | 7.5 to 10 kVA |
| 400 gaz | 15 kVA |
| 500 gaz | 20 kVA |
| 600-800 gaz | 25 kVA |
How the inverter manages the generator:
The hybrid inverter accepts generator power through its generator input port. When battery levels fall below your set threshold, typically 20 percent, the inverter signals the generator to start (via an automatic transfer switch) and begins charging the battery. Once the battery reaches the set charge level, the generator stops and solar takes over. This happens automatically with no manual intervention.
A changeover switch manages the safe electrical transition between your solar system output and the generator input. Contact MartOnline via WhatsApp for availability and pricing on changeover switches and automatic transfer switches for your generator size.
Battery Options for Off-Grid Systems
Off-grid systems require more batteries than hybrid systems. Here are the options available from MartOnline:
16kWh LiFePO4, current standard:
The SAJ EK30 B3 16kWh is the most popular choice for off-grid systems. With 15.2kWh of usable capacity (95% DOD) and over 8000 cycle life, up to 16 units can be connected in parallel for a maximum of 256kWh total storage. Plug-and-play compatible with SAJ H2 inverters via CAN protocol.
The Sunwoda Atrix Max Plus 16kWh offers 10000 cycle life, the highest available from MartOnline, with up to 32 units in parallel for a maximum of 512kWh. For large off-grid systems where battery longevity is critical, the Sunwoda is the premium choice. Built-in casters make positioning during installation straightforward.
The Mesol 16kWh Infiniti is designed for the Pakistani market with 10kW maximum discharge power. A practical locally supported option for off-grid systems where a high discharge rate is needed to power large loads simultaneously.
10kWh LiFePO4, coming soon:
A 10kWh battery gives more flexibility in building exactly the right capacity for your system without overshooting. Three 10kWh batteries give 30kWh, four give 40kWh, finer increments than the 16kWh option. Contact MartOnline via WhatsApp for availability and pricing.
5kWh LiFePO4, coming soon:
A 5kWh battery is useful for very small off-grid systems or as an incremental addition to an existing battery bank. Contact MartOnline via WhatsApp for availability and pricing.
Karachi-Specific Factors for Off-Grid Systems
Monsoon season planning:
Karachi's monsoon from July to September is the most critical period for off-grid systems. Extended cloudy weather reduces solar generation and the battery bank must compensate. The 50 percent buffer built into our battery sizing recommendations accounts for 1 to 2 overcast days. For 3 or more consecutive days of heavy cloud cover, your generator backup becomes essential. This is why we recommend generator integration for every off-grid installation regardless of property size.
Salt air and coastal corrosion:
Properties within 5 to 10 kilometres of the Arabian Sea, including DHA, Clifton, Korangi Creek, and Keamari areas, are exposed to salt-laden air that accelerates corrosion in electronic equipment. For these locations, the Elego Oyster 6KW and Elego Oyster 10KW with dual IP66 and NEMA 4X certification provide significantly better long-term protection than standard IP65 inverters. NEMA 4X specifically certifies corrosion resistance in marine environments.
Summer heat management:
Karachi's summer months from May to August bring extreme heat with ambient temperatures regularly exceeding 45 degrees Celsius and rooftop surface temperatures reaching 70 degrees Celsius or more. Your inverter must be installed in a shaded, ventilated location away from direct sunlight. A utility room, garage or covered veranda wall is ideal. Never install the inverter in an enclosed space without ventilation as thermal derating will reduce your system's output at exactly the moments you need it most.
Panel cleaning schedule:
Karachi's mix of dust, industrial pollution and monsoon rain means solar panels require regular cleaning to maintain output. During dry months from October to May, clean panels every 2 to 4 weeks. During and after monsoon months, clean after every significant rain and dust storm. Dirty panels can lose 15 to 25 percent of their rated output, which is a significant impact on an off-grid system that depends on full daily generation to recharge the battery bank.
Lightning protection during monsoon:
Surge Protection Devices are especially important for Karachi off-grid systems during the monsoon season when lightning strikes are more frequent. Type 2 SPDs on both the DC input side and AC output side of your inverter protect your entire system investment from voltage spikes. This is not optional for a system this size, contact MartOnline via WhatsApp for current SPD availability and pricing.
Off-Grid vs Hybrid, Cost and ROI Comparison
An off-grid system costs more upfront than a hybrid system of the same inverter capacity, primarily because of the larger battery bank required.
Approximate additional cost of off-grid vs hybrid:
| Property Size | Hybrid Battery Cost | Off-Grid Battery Cost | Difference |
|---|---|---|---|
| 80-120 gaz | 1 battery | 2 batteries | 1 extra battery |
| 200-240 gaz | 2 batteries | 3-4 batteries | 1-2 extra batteries |
| 400 gaz | 2 batteries | 6 batteries | 4 extra batteries |
| 500 gaz | 3 batteries | 8 batteries | 5 extra batteries |
Contact MartOnline via WhatsApp for current pricing on all battery options.
The ROI calculation for off-grid:
For a homeowner in Malir or Korangi paying Rs 30,000 per month to K-Electric and running a generator 8 hours per day at Rs 5,000 per month in fuel costs, total monthly energy cost is approximately Rs 35,000. An off-grid solar system eliminates both the K-Electric bill and the generator fuel cost. The higher upfront investment in extra batteries is recovered through these combined savings significantly faster than the battery cost alone suggests.
Beyond the financial calculation, the peace of mind value of complete energy independence is real and significant. You never check the K-Electric load shedding schedule. You never worry about unannounced outages disrupting your work or sleep. You never deal with generator noise, fuel procurement or maintenance. For many Karachi homeowners in high-loss areas this non-financial value is worth as much as the monetary savings.
Installation Requirements for Off-Grid Systems
Off-grid systems are more complex to install than basic hybrid systems and require a qualified solar engineer. Key installation requirements:
Earthing is mandatory:
A verified earth connection for the inverter, battery bank and panel mounting structure is non-negotiable for safety and is required by NEPRA for any grid-connected system. Even for off-grid systems not connected to K-Electric, proper earthing is essential for lightning protection and equipment safety.
Proper cable sizing:
Off-grid systems carry higher currents than hybrid systems because the battery bank is larger and charges and discharges at higher rates. All DC cables between panels and inverter, and between inverter and battery bank, must be correctly rated for the maximum current they carry. Undersized cables cause energy loss, heat buildup and potential fire hazards. This is not an area to cut costs.
Roof load assessment:
A large panel array for a 400 to 500 gaz off-grid system can weigh 800 to 1200 kilograms including mounting structures. Your installer should verify that your roof can support this load before installation begins.
Battery room considerations:
Large battery banks of 4 or more batteries require adequate floor space and ventilation. LiFePO4 batteries are safer than other lithium chemistries but still generate some heat during charging and discharging. Ensure your battery installation location has adequate airflow and stays below 45 degrees Celsius during summer months.
Professional installer in Karachi:
MartOnline supplies the equipment. For professional off-grid solar 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 size and system requirements.
Not Sure About Your System Size?
Use our free solar calculator to estimate your system size based on your appliances and daily usage hours. Enter your appliances, set your load shedding hours to 12 or more to simulate off-grid requirements, and get a recommendation from our live product inventory.
For large systems above 400 gaz or any system with specific requirements, contact MartOnline directly via WhatsApp with your complete appliance list and property details for a custom off-grid system design.
Frequently Asked Questions
Can I go completely off-grid in Karachi without any K-Electric connection?
Yes. An off-grid solar system in Karachi operates entirely independently of K-Electric with no connection to the grid whatsoever. Your home runs on solar panels during the day and battery storage at night. The system described in this guide includes a generator as emergency backup for extended cloudy periods, but the generator is not K-Electric and you choose when and whether to use it. Many homeowners in high-loss areas of Karachi have already made this transition and no longer have any relationship with K-Electric at all. Contact MartOnline via WhatsApp to discuss the right system size for your property.
How many batteries do I actually need for a 200 gaz house to go fully off-grid in Karachi?
A 200 gaz Karachi home with two 1.5 ton ACs running 8 hours per day consumes approximately 32kWh of energy daily. With a 50 percent safety buffer for cloudy days the minimum battery bank is 48kWh. Three SAJ EK30 B3 16kWh batteries give 45.6kWh of usable capacity at 95 percent depth of discharge, sufficient for 14 to 16 hours of overnight coverage. When our 10kWh battery becomes available, five 10kWh units will give the same capacity with more flexibility. Contact us via WhatsApp for current pricing on three-battery configurations.
What happens to my off-grid system during Karachi's monsoon season?
During the July to September monsoon season, cloud cover reduces solar generation by 20 to 30 percent for several days at a time. The 50 percent battery buffer built into our sizing recommendations handles 1 to 2 overcast days comfortably. For extended cloudy periods of 3 or more days, the generator backup connected to your inverter's generator input charges the battery bank automatically. Karachi's monsoon is typically 2 to 3 months long but does not bring continuous cloud cover, most days still see partial sun. A correctly sized off-grid system with generator backup handles the monsoon season without any manual intervention.
Do I still need to pay K-Electric if I have an off-grid solar system?
No. A fully off-grid solar system has no connection to K-Electric's grid. You do not pay a monthly bill, you do not deal with load shedding schedules, and K-Electric plays no role in your electricity supply. You will need to formally request disconnection from K-Electric once your off-grid system is commissioned if you wish to remove their infrastructure from your property entirely, though many homeowners simply stop paying and K-Electric eventually disconnects them. Consult your installer and a legal advisor on the formal disconnection process in your area.
How long does it take to charge a large battery bank from solar in Karachi?
In Karachi with 5.5 peak sun hours per day, a correctly sized panel array charges the battery bank from 20 percent to 100 percent within a single day under normal sunny conditions. For a 200 gaz home with three 16kWh batteries (48kWh total) and 20 panels of 645W (12.9kWp), the panels generate approximately 71kWh per day. After running the home's daytime load of approximately 15kWh during generation hours, approximately 56kWh is available for battery charging, more than enough to fully recharge the depleted battery bank each morning. During overcast days generation may drop to 30 to 50 percent of this, which is why the generator backup is essential for extended cloudy periods.
Is an off-grid solar system more expensive than a hybrid system in Karachi?
Yes, an off-grid system costs more upfront than a hybrid system of the same inverter capacity, primarily because of the larger battery bank. For a 200 gaz home the off-grid system requires three 16kWh batteries versus one to two batteries for a hybrid system, a meaningful additional cost. However for homeowners in high-loss K-Electric areas who are currently spending Rs 25,000 to Rs 40,000 per month on K-Electric bills plus generator fuel costs, the combined monthly savings from complete energy independence often justify the higher upfront investment within a reasonable timeframe. Use our solar calculator to estimate your system cost and payback period based on your current monthly electricity expenditure.