Fotovol Guide — Q&A
Short answers to the most common questions about solar panels, the Casa Verde program and real-world costs.
Huawei SUN2000 inverters — Romania's best-selling inverter
Huawei SUN2000 is the most-installed inverter in Romania in 2024–2025 — good price, mature FusionSolar, 10-year warranty. Native integration with LUNA2000 batteries. Verify the spare-parts pipeline with your distributor.
Updated 26 April 2026
Enphase microinverters — one inverter per panel
Enphase makes microinverters (one per panel) — each panel produces independently, no loss from partial shading. 30–50% higher cost, but ideal for roofs with complex shading or irregular shapes.
Updated 26 April 2026
Fronius inverters — native heat pump and EV integration
Fronius (Austria, 1945) excels at smart-home integration with heat pumps and EV chargers. The GEN24 + Smart Meter + Ohmpilot suite orchestrates surplus directly into loads. European quality, priced similarly to SMA.
Updated 26 April 2026
SMA inverters — the "Mercedes" with 25-year support
SMA Solar (Germany, 1981) is the reliability reference for inverters — warranty extensible to 20 years, long software support. 30–50% above Mid pricing, justified for installs that must run 25 years without replacement.
Updated 26 April 2026
SolarEdge inverters — DC optimisers for shaded roofs
SolarEdge invented DC optimisers, useful on partially shaded roofs (15–25% gain). 2024–2025 financial trouble cut prices, but verify official support. 12-year warranty, extensible.
Updated 26 April 2026
ReneSola panels — brand without its own factory
ReneSola pivoted from manufacturing to project development after 2017. Panels sold under the brand in 2026 are Tier 2–3 OEM. Recommendation: skip or insist on origin documentation.
Updated 26 April 2026
Talesun panels — budget, but watch for uneven quality
Talesun Solar is a Chinese budget manufacturer popular in Eastern Europe. Quality varies batch to batch, some installs degrade fast. The formal 12-year warranty depends on the distributor. Acceptable only at a 20%+ price gap vs Mid Tier-1.
Updated 26 April 2026
Yingli panels — former leader, now in decline
Yingli was the world leader in 2012–2013, then went through severe financial restructuring. Pre-2018 warranties are no longer honoured consistently. Most Yingli panels on the Romanian market are old stock or second-hand. For new installs, pick something else.
Updated 26 April 2026
Risen Energy panels — good price, but ask for back-to-back warranty
Risen Energy is one of the largest Chinese panel makers but with low visibility in Romania. Decent quality, occasionally uneven lots. Recommended only with back-to-back distributor warranty and at least 10% price gap below Jinko/LONGi.
Updated 26 April 2026
Hanwha Q-Cells panels — accessible non-Chinese premium
Q-Cells (German origin, owned by Hanwha since 2012) produces Q.PEAK DUO panels at 22% efficiency from South Korea and Malaysia. European-grade quality at Mid pricing, warranty handled through the Berlin office. Good when you want a non-Chinese brand without Maxeon-tier pricing.
Updated 26 April 2026
Canadian Solar panels — durable for harsh climates
Canadian Solar is Tier-1 Nasdaq-listed, appreciated for durability (PID, salt, ammonia). Good for mountain and coastal regions in Romania. Slight premium over LONGi/Jinko, but longevity reputation.
Updated 26 April 2026
JA Solar panels — Tier-1 without hype, but thinner service
JA Solar is top-5 globally by volume, less visible than LONGi/Jinko. DeepBlue 4.0 (n-type TOPCon) hits 22%+ efficiency. Verify your distributor's replacement turnaround — Romanian service is thinner than Jinko's.
Updated 26 April 2026
Trina Solar panels — Vertex, ideal for large projects
Trina Solar was among the first Chinese Tier-1 Bloomberg makers. The Vertex line (600–700W) is ideal for 10 kWp+ projects and large roofs. For 5–8 kWp residential on segmented roofs, Jinko 450W is a better fit.
Updated 26 April 2026
Jinko Solar panels — Tiger Neo, Romania's best-selling TOPCon
Jinko Solar is the world's largest panel manufacturer by volume. The Tiger Neo n-type TOPCon series hits 22.5% efficiency at Mid pricing and is the best-selling panel on Romania's Casa Verde program. 12-year product warranty, 25-year performance.
Updated 26 April 2026
LONGi panels — the safe Mid-tier pick
LONGi is the world's largest panel manufacturer, consistent Bloomberg Tier-1, with 21–22% efficiency on the Hi-MO series. The rational default for 5–15 kWp Romanian residential. Verify serials through official distributors, avoid grey-market.
Updated 26 April 2026
Sharp panels — Japanese pioneer, scaled down in 2026
Sharp built the first commercial panels in 1963, but in 2026 produces limited volumes, mostly for Japan. Sporadic availability in Romania with no official service network. More curiosity than practical pick.
Updated 26 April 2026
LG panels — exited manufacturing in 2022
LG Electronics exited solar panel manufacturing in June 2022. Remaining Romanian stock is limited and service is hard to find. For a new install in 2026, pick Q-Cells, LONGi or Jinko instead.
Updated 26 April 2026
Panasonic panels — beware post-2022 rebrands
Panasonic shut down its own panel production in 2021 and now resells OEM panels. Real pre-2022 stock is rare; most "Panasonic" panels on the Romanian market in 2026 are rebrands. Verify the manufacturing date and supply chain before buying.
Updated 26 April 2026
REC panels — accessible premium from Singapore
REC manufactures HJT premium panels in Singapore, with a 25+25 year warranty and over 22% efficiency. Below Maxeon in price, above Mid-tier in tech. Ask for ProTrust Installer certification for the extended warranty.
Updated 26 April 2026
SunPower (Maxeon) panels — what to know before buying
SunPower / Maxeon produces the highest-efficiency commercial panels (22.8%) and the longest warranty in the industry (40 years). Cost is ~2× a Mid panel. Justified only for small roofs where every productive m² counts.
Updated 26 April 2026
Solar batteries — brands, types, and when they make sense
LiFePO4 as the standard, brands on the Romanian market (Huawei LUNA2000, BYD, Pylontech, Tesla), DoD, cycles, and when it makes financial sense.
Updated 26 April 2026
Solar inverters — brands, types, and how to choose
String vs hybrid, brands on the Romanian market (Huawei, Sungrow, Fronius, SolarEdge), MPPT, efficiency, and what to check on the datasheet.
Updated 26 April 2026
Solar panels — brands, what to look for, what to avoid
How to filter panel brands (the Bloomberg Tier-1 list), why 450 W is the residential sweet spot, and what to verify on the datasheet.
Updated 26 April 2026
How to identify if your service is single-phase or three-phase
Four quick methods to check your connection type: the switchboard, the meter, the wire count, or a call to your grid operator.
Updated 26 April 2026
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