Tap the map to set the location, or press Draw roof and tap each corner of the roof.
Long-term monthly averages from NASA POWER (about 50 km resolution). Open this spot in Google Maps ↗
Self-consumption = share of solar used on site. Solar fraction = share of the building's load met by solar (direct + battery).
No battery in this system, so there is no charge to track.
South-facing, current settings. The highlighted point is your current tilt. Across Iraq (30–37°N) the annual optimum is roughly 22–30°. Northern cities have a cloudier winter, which favours a slightly lower tilt than latitude alone suggests.
Cell temperature is modelled hourly from ambient temperature and irradiance (NOCT 45°C) at −0.4%/°C above 25°C. Iraqi summers routinely push cells past 65°C. Elevated, well-ventilated mounting reduces the loss.
Programme names, eligibility and amounts are indicative planning estimates and have not been verified. Confirm current terms directly with each institution before relying on them.
Iraqi commercial grid tariffs are roughly $0.08–$0.12/kWh (IQD 106–158), and diesel backup costs about $0.25–$0.35/kWh (IQD 330–462). Rooftop solar LCOE depends heavily on install cost and financing.
Irradiation
Long-term monthly mean global horizontal irradiation and air temperature for the chosen location come from NASA POWER (fetched live for map locations; 20 Iraqi cities are built in, and the nearest city is used as a fallback offline). Sun position uses the exact latitude. Irradiation is converted to a clearness index for each month. A representative day per month is simulated in 15-minute steps. The Erbs correlation splits each step into beam and diffuse, and an isotropic-sky (Liu–Jordan) model projects it onto the tilted roof. The weather input affects only the selected-day view. Annual figures always use long-term averages.
Losses
Battery & load
Factory: the set load runs during operating hours (day shift, two shifts or 24 h), with 15% of it at other times. On closed days (e.g. Fridays) only that 15% base load runs all day, so more solar is exported.
House: daily consumption follows an illustrative Iraqi household pattern: lower at night, rising through the afternoon for cooling, and peaking in the evening. Summer use is about 45% above the annual average and spring about 20% below, reflecting air-conditioning. Both shapes are assumptions; replace them with metered data where available.
Roof drawing
Roof area is calculated from the outline you draw on the satellite map, projected to metres around the roof's centre (accurate to well under 1% for building-sized shapes). A drawn outline is the horizontal (plan) area. For a pitched roof face, the sloped area = plan area ÷ cos(tilt), and the panels face perpendicular to the longest edge (the ridge or eave line). The sun-facing side is suggested, and you can switch to the other side. On flat roofs, panels are assumed to sit on racks facing the equator.
Solar serves the load first, then charges the battery (max 0.5C), and the remainder is exported. The battery discharges into the load whenever solar falls short. Round-trip losses are split equally between charging and discharging. Each day is simulated twice so the state of charge reaches a steady state.
Economics
This is a screening-level model for early feasibility. Before investing, validate with a site-specific PVGIS / PVsyst study and confirmed quotes.