Keyhan Energy designs and builds Solar Power Plant projects at residential, commercial and industrial scale. We cover the entire path of a solar energy project: feasibility and site irradiance estimation, design of the Solar panel array, inverter and battery selection, equipment supply, installation and commissioning, and post-commissioning support.
Why renewable energy?
Renewable energy — and in Iran specifically solar energy — is both the answer to the grid's power imbalance and an investment whose return can be calculated based on capacity, the guaranteed purchase tariff and the site's irradiance: generating electricity at the point of consumption, lower bills, income from selling power to the grid under guaranteed contracts, and stable power for production lines for which a blackout means a stoppage.
Types of solar power plants
- Grid-connected (On-Grid): Without battery, direct feed into the grid; suitable for cutting bills and selling power.
- Off-grid: With battery; suitable for sites without grid access, agricultural wells and telecom sites.
- Hybrid: Grid plus battery; stable power even during blackouts.
Project execution steps with Keyhan Energy
- Technical and economic feasibility based on your site's actual irradiance and consumption pattern
- Design and engineering: panel layout, inverter and battery sizing, construction drawings
- Equipment supply: panels, inverter, mounting structure, switchboard and protection
- Installation, testing, commissioning and operator training
- Performance monitoring and after-sales service
For an initial estimate right now, use the Free solar power plant calculator — it calculates the capacity of the Inverter, panels and Battery you need, based on irradiance data for 30 Iranian cities.
Our completed power plants
- 400 kW — Bardaskan: Rooftop solar power plant
- 400 kW — ISACO: Rooftop solar power plant
- 200 kW — Loshan: Rooftop solar power plant
The specifications and images of each project are on our completed projects page.
Solar power plant related products
- Solar Inverter — on-grid, off-grid and hybrid
- Industrial Battery — sealed lead-acid and lithium for storage
- Industrial Battery Charger — Made by Keyhan Energy
- UPS (Uninterruptible Power Supply) — uninterrupted power for sensitive loads
Frequently asked questions
How much does it cost to build a solar power plant?
It depends on capacity (kW), system type (on-grid/off-grid), equipment brand and installation conditions. Use Contact us to get an accurate estimate for your own project.
How many panels does a home solar power plant need?
It depends on your monthly consumption and your city's irradiance; the Calculator answers exactly this in a few minutes.
Does Keyhan Energy also supply the equipment?
Yes — Equipment Supply (panels, inverter, batteries and switchboard) is offered both as a standalone service and as part of a turnkey contract.
Standards that guarantee plant quality
When evaluating a plant construction proposal, instead of relying on brand, ask the contractor to document the compliance of components and design with the reference standards: modules to IEC 61215 (durability and performance) and IEC 61730 (safety), DC array design to IEC 62548, handover, documentation and commissioning tests to IEC 62446-1, and performance monitoring in operation to IEC 61724. Having these five standard numbers in the contract's technical annex closes off a large part of the quality risk.
PR and Specific Yield — the Common Language of Plant Assessment
Two indicators make the performance of any plant comparable. Specific production (Specific Yield) is the annual kWh generated per kW of installed capacity; across Iran's climates it typically falls in the range of 1500 to 1800 kWh/kWp per year. Performance ratio (PR) shows what share of the site's irradiation potential has actually been converted into electricity, summarizing in one figure the losses from temperature, cabling, the inverter and dust.
Worked example: a 400 kW plant that generates 660 MWh a year has a specific yield of 660,000 ÷ 400 = 1650 kWh/kWp; if the site's annual tilted-plane irradiance is 2060 kWh/m², PR ≈ 1650 ÷ 2060 ≈ 0.80 — a healthy figure for a well-designed plant.
Before signing a contract, you can estimate your own site's output with Keyhan Energy solar calculator and use that as the basis for discussion in the technical meeting.
Revenue path: guaranteed sales and self-consumption
In Iran there are two main economic routes for a solar power plant: a guaranteed renewable power purchase agreement through SATBA (satba.gov.ir) with the rates and caps announced for each period, and reducing the electricity consumption of an industrial/commercial unit through its own generation. Choosing the optimal route and capacity depends on your electricity tariff, consumption pattern and permitted connection capacity; guaranteed purchase rates vary and must be checked with the official source at the time of decision — this is part of our consulting services.
Operation, monitoring and output maintenance
A plant's output decline is almost never sudden; it creeps. Three pillars of upkeep: Continuous monitoring at inverter level and, in larger plants, at string level (per the IEC 61724 framework) with an alarm on deviation from expected output; Periodic cleaning of the modules, which in dusty areas makes a noticeable difference of several percent in output; and Annual inspection including thermography of connections and switchboards, insulation testing and checking the tightness of DC connections. A monthly report of output versus expected value is the common language between you and the operator.
Two frequently asked expert questions
PR Has Dropped — Who Is to Blame?
Order of checks: soiling on module surfaces, irradiance sensor error, drop-out or shutdown of a string (fuse/connector), abnormal connection temperature, and finally degradation of the modules themselves. String-level monitoring cuts this diagnosis from days to minutes.
What is the capacity ceiling on a rooftop?
Three decisive constraints: usable area and shading, the roof's structural capacity, and the permitted grid-connection capacity at your service point. A realistic estimate is only possible with a site visit and calculation; our completed experience up to 400 kW at Keyhan Energy projects is documented.