Short answer
Solar Nexo is a solar company based in Kepez, Antalya. This reference project is a 7.7 kW solar system with battery storage installed at a sea-view home. The panel array, off-grid inverter and battery bank form a mid-sized off-grid solution built to supply the home's electricity independently of the grid.
Project summary
This reference project is a 7.7 kW solar system with battery storage, installed for a sea-view home. This mid-sized system supplies the home's electricity without connecting to the grid. Location and date information is not given on this page.
System components
- Power: 7.7 kW (treated as panel power)
- Panel array: photovoltaic panels on or near the home's roof
- Inverter: off-grid inverter
- Storage: battery bank; type and capacity are not specified
- Protection: DC fuse, surge protection, earthing
Why was this system designed this way?
The right ratio at 7.7 kW scale
In off-grid homes, panel power and battery capacity must be considered together. A common practice is that most of the daily production can be stored in a single battery cycle. According to PVGIS, the annual average daily specific production in central Antalya is about 4.5 kWh/kWp (1,656 / 365). For 7.7 kWp this means about 35 kWh per day; about 42 kWh in July and about 25 kWh in January.
Seasonal balancing
When the home's daily consumption stays below these values, the system runs comfortably. In winter, production falls to about 59% of the summer value; for this reason, loads such as air conditioning and electric heating must be calculated separately at the design stage in winter. The critical point of the design is the winter average, not the annual average.
Choosing the battery type
Lithium iron phosphate (LiFePO4) batteries offer a high usable depth of discharge and long cycle life; lead-acid gel batteries have a lower initial cost but require shallower discharge. The battery type in this project is not specified on the page; the choice is made according to the load profile, budget and maintenance preferences.
Safety and durability
In seaside homes, salty air can accelerate corrosion of the structure and terminals. For this reason corrosion-resistant fasteners and regular inspection are recommended.
Load management and monitoring
In mid-sized homes, a display or mobile app that tracks the battery charge level helps the user steer load behavior correctly. When the battery level is low, deferrable loads such as the washing machine are not run. Monitoring data shows consumption habits accumulated over months and makes it easier to decide later whether to add batteries.
Estimated production
In the PVGIS calculation (European Commission JRC, PVGIS 5.3) for central Antalya conditions, assuming optimum tilt and 14% system losses, annual specific production is 1,656 kWh/kWp. With the PVGIS reference for central Antalya, for 7.7 kW of power this means a theoretical production potential of about 12,751 kWh/year.
| Period | Specific production (kWh/kWp) | Estimated production (kWh) |
|---|---|---|
| January (lowest) | 99 | 762 |
| July (highest) | 168 | 1,294 |
| Annual | 1,656 | 12,751 |
At this scale, not all production is expected to be used: once the battery is full, incoming energy is used only as far as the instantaneous load. The figures show theoretical potential. The "7.7 kW" value in the table is treated as panel power. These values are a theoretical PVGIS calculation; actual production varies with roof or land orientation, tilt and shading.
Installation and commissioning process
At the survey, the roof's orientation and tilt, the wind load from the sea side and the home's consumption habits are assessed. In the design, the number of panels, battery capacity and inverter power are determined from the load list. Durable fasteners are used during installation, and battery and inverter parameters are set at commissioning. Maintenance and 7/24 technical support follow.
For a similar system
It suits mid-sized homes far from the power line or that do not want the investment to depend on the grid connection process. Calculating winter consumption realistically is the most important step.
- Off-grid systems service page
- Solar Nexo reference projects
- Solar energy calculation tool
- Contact for a free site survey
- Difference between lithium and gel batteries
- How many kW of solar panels do you need
Questions about this project
How much does a 7.7 kW off-grid system produce per day?
In central Antalya conditions, with the PVGIS reference, the annual average is about 35 kWh per day of theoretical production potential. It is around 42 kWh in July and around 25 kWh in January. Real values vary with roof orientation, tilt and shading; in an off-grid system, production is curtailed when the battery is full, so the energy used may be lower.
Is a battery solar system enough in winter?
In winter, production falls to about 59% of the summer value, so sizing should be done for winter consumption. The January PVGIS value is 99 kWh/kWp and the July value is 168 kWh/kWp. Adequacy depends on the home's load list, battery capacity and the desired autonomy. A backup generator input can be added if needed; however, no backup source is stated in this project information.
Does this system work during a power outage?
Because the system is not connected to the grid, it is unaffected by grid outages; the home is fed from the panels and the batteries. Continuity depends on battery capacity and load management. The duration varies with battery capacity, night load and season. The question of how many hours it lasts is therefore answered by first drawing up the load list. Exact values are settled in the free survey with project-specific data, and this estimate is updated.
Related guides
Estimated yields are theoretical values based on PVGIS 5.3 data (EU Joint Research Centre); actual output depends on roof orientation, tilt, shading and temperature.
Considering a similar system?
The Solar Nexo team visits your property, reviews your consumption and roof, and designs the right system for you free of charge.
