Frequently Asked Questions

Under Turkish conditions, rooftop systems typically pay back in 4-7 years. Three things set where you land in that range: your annual electricity consumption, the tariff you are on (residential, commercial or industrial) and how well your roof performs in sunlight. Businesses that consume most of their energy during daylight hours sit at the lower end; sites that export a large share of their generation sit at the upper end. The real figure for your site comes out of the survey and feasibility study, based on the last 12 months of consumption data and on-site measurements. At quotation stage we share that calculation openly, together with the assumptions behind it.

The great majority of self-consumption systems fall under unlicensed electricity generation, which means you do not need a separate generation licence. The process starts with an application to your distribution company; if the application is approved, a call letter (çağrı mektubu) is issued. The electrical project is then submitted for approval, the connection agreement is signed, and once installation is complete the system is energised following provisional acceptance. All of these timelines vary by distribution region and by how busy the application queue is, which is why we only commit to a schedule after seeing the current situation in your region. The application, project approval and acceptance steps are all handled by us under the contract.

Net metering settles the electricity you generate against the electricity you consume, through your meter. During the day the system first supplies the site itself; surplus energy is exported to the grid and recorded at the meter. Over the billing period the energy you drew from the grid and the energy you fed into it are netted off against each other, and you pay only the difference. If generation exceeds consumption at the end of the period, the surplus is treated according to the principles set out in the regulations. The procedure and the pricing for net metering are defined by regulation and can change over time; we verify the rules in force at the time of the feasibility study.

The panels we install carry a 25-year performance warranty. That warranty guarantees the panel will not fall below a defined output level: at year 12 it retains 90% of its rated power. Because a photovoltaic panel has no moving parts, its degradation is slow and predictable; what it actually needs is cleaning and connection checks. Electronic components such as inverters carry different warranty terms from the panels, and those are stated separately in the quotation.

In a standard panel the cells are wired in a single series string, so shading one cell stops the entire string — roughly a third of the panel. In a half-cut panel the cells are split in two and the bypass diodes are separated, so the upper and lower halves of the panel work independently. If one half falls into shade, the other half keeps producing. The current through each cell is also lower, which reduces internal resistance losses and raises output. On roofs, where shadows from chimneys, antennas, parapets and neighbouring buildings are unavoidable, that difference shows up directly in annual yield.

Solar systems have no moving parts, so the maintenance burden is low — but it is not zero. Panels should be cleaned once or twice a year to prevent yield losses from dust, pollen and bird soiling; in dusty regions and industrial surroundings that frequency increases. Cable connections, distribution boards and earthing are checked periodically, and a thermal camera is used to scan for hot spots. Inverters are serviced at the intervals specified by the manufacturer, with consumables such as fans and filters replaced. We offer operations and maintenance (O&M) under a separate contract: the system is monitored remotely and an intervention is scheduled whenever output drops below expectation.

We build storage on lithium-ion technology. High energy density, the absence of a memory effect and slow self-discharge have made it the standard for solar applications. Cells run at 3.6V nominal and 4.2V peak; capacity loss after around 500 cycles stays near 10%. Cell chemistry is chosen per application: LiFePO4 offers longer cycle life and a safer chemistry, lithium-polymer (LiPo) gives higher energy density, and lithium titanate is considered for specific scenarios. The battery C-rating — its charge and discharge rate — is sized to your usage scenario.

Yes. On the wind side we work with İstabreeze turbines, 100% manufactured in Türkiye. The reason is service: unlike imported alternatives, full spare-part and service support — covering blade, tail and body damage — is available domestically and quickly. Turbine sizing follows your existing photovoltaic system: 12V, 24V or 48V system voltage, matched to your battery bank amp capacity and your inverter voltage. Turbines are classified by maximum generator wattage. Wind keeps producing outside solar hours — at night and through the winter — flattening the generation profile of a hybrid system.

A hybrid system combines photovoltaic generation with battery storage and, where useful, a second source such as wind. Energy then becomes available "when it is needed" rather than only "while the sun shines". A hybrid solution makes particular sense in three situations: sites where a grid outage stops production, users who consume most of their energy in the evening and at night, and locations where grid access is limited. Storage raises capital cost, so the decision is made on the numbers; in the feasibility study we place the with-storage and without-storage scenarios side by side. In larger designs, SCADA-based load balancing dispatches output according to what the site or the grid needs.

EPC means that engineering, procurement and construction responsibility all sit with a single contractor. Under a turnkey scope the investor works with one counterparty instead of contracting separately with several firms, and the technical risk and coordination burden rest with the contractor. Our scope begins with the survey and feasibility study, then continues through electrical and structural design, permitting applications, equipment procurement, on-site installation, grid connection and commissioning. After commissioning, monitoring, periodic maintenance and fault response continue under an optional O&M contract. Every quotation defines the boundary of the scope in writing — what is included and what is not.

11:11 Solar Enerji is the Türkiye corporate partner of SILEX EPC. The party that signs the contract and carries responsibility as main contractor is 11:11 Solar Enerji Ltd. Şti.; your counterparty, your invoice and your warranty holder are one and the same company. On the engineering, procurement and project-management side we draw on the technical support of SILEX EPC, headquartered in Dubai and active since 2009. The structure exists to combine the accessibility of a local company with the experience of an international engineering pool.

The Solar Tree is a product that combines renewable generation with a decorative landscape solution. In a steel structure of a trunk and branches, high-efficiency panels mounted on the branches generate direct current, and inverters concealed in the trunk convert it into usable alternating current. The storage unit inside the trunk discharges down to roughly 10%, so it keeps supplying power at night and in overcast weather. Total power is 3,300-3,900 Wp and annual generation is in the 5,000-6,000 kWh range; that output avoids approximately 250 kg of CO₂ emissions per year. With options for USB charging sockets, a 220V outlet, lighting, an information display, a public-address system and a Wi-Fi access point, it can be configured for public spaces such as squares, parks and campuses.

We do both. On ground-mounted solar plants our scope runs from site selection through to grid synchronisation: topographic and soil analysis, the choice between fixed and sun-tracking structures, DC/AC design, switchyard integration and commissioning. The references reached through our partnership network include plants delivered with tracking systems and grid integration at scales up to 175 MW on 320 hectares and 300 MW on 400 hectares. Alongside solar there is engineering experience in wind, hydroelectric, geothermal and combined-cycle natural-gas projects. For investor-scale projects the process starts with a non-binding preliminary feasibility study.

We do not have a standard financing product applied identically to everyone, which is why we do not publish terms on the website. The payment plan is discussed at quotation stage according to the scale and duration of the work, and is then defined in writing in the contract. So that you can assess the financial side of the investment, the feasibility study sets out the payback period, the annual saving and the total investment amount, together with the assumptions behind them. If you are considering a bank loan or an incentive application, we prepare the technical documentation those applications require. For concrete terms, the best route is to contact us directly.

Four factors decide suitability: the orientation and pitch of the roof, the shading situation, the usable net area, and whether the load-bearing structure can carry the additional weight. South-facing roofs give the highest yield; east-west roofs spread generation across the day and remain economical in most cases. Where there are shadows from a chimney, a lift shaft or a neighbouring building, half-cut panels and an appropriate string design recover much of the loss. Whether the structure can take the added load is verified during the survey, from the building drawings and, where needed, a structural calculation. All four factors are assessed during the site survey — and if the answer is negative, we say so plainly.

A grid-connected (on-grid) system shuts down automatically during an outage, as a safety requirement. The reason is technician safety: feeding energy into the grid during an outage endangers the crews working on the line, so inverters halt generation through anti-islanding protection. If you want supply to continue during an outage, you need a hybrid installation with battery storage and an inverter topology that takes over when the grid fails. In that case the critical loads are moved onto a separate distribution board and only those are supplied during the outage. Which loads count as critical, and how much storage capacity is required, are determined in the feasibility study.

On-site installation takes anywhere from a few days to a few weeks, depending on system size and how accessible the roof is. What usually drives the total schedule, though, is not the installation but the permitting and grid-connection steps, and their duration varies by distribution region and application volume. That is why we only commit to a schedule in writing in the quotation, once we have seen the project scale and the current situation in your region. You can find the six steps of the process — survey, feasibility, design and permitting, procurement, installation and commissioning, monitoring and maintenance — set out in detail on the Process page.

Filling in the form on the Get a Quote page is enough; once you share the project type, the location, the roof area or target capacity and your monthly consumption, we can complete a preliminary assessment quickly. You are also welcome to message us on WhatsApp at +90 532 297 52 34 or email cerdogan@1111solar.energy. After an initial conversation we schedule a site survey; the survey and feasibility study produce a quotation with a defined scope, schedule and price. Having your last 12 months of electricity bills to hand is the single most useful preparation, because it is what makes the calculation closest to reality.