Fotovol Guide — Q&A
Short answers to the most common questions about solar panels, the Casa Verde program and real-world costs.
5 kWp in Brașov — how many kWh it produces month by month
A 5 kWp system in Brașov county produces 5,500–5,900 kWh/year (1,152 kWh/kWp/year PVGIS). Month-by-month production table, scaling to 3/7/10 kWp, comparison with neighbouring counties, and the factors that reduce real-world output.
Updated 18 May 2026
5 prosumer mistakes — and what each one actually costs
The 5 most costly solar mistakes: oversizing, the no-payback battery, installing before the ATR, night-charging the EV, and confusing injected vs compensated kWh. With real numbers for each.
Updated 18 May 2026
Prosumer regrets after 2 years — 5 lessons with numbers
Five common regrets at 18-24 months post-install: too few panels, no battery when subsidies existed, firm without local service, fixed buyback clause, single-phase service line that blocks an EV. With real costs for each.
Updated 18 May 2026
Prosumer contract in Romania — steps, costs, and pitfalls
The 3 contracts (DSO connection, ATR, supplier addendum), 45–90 day timeline, real costs, and the 4 net-metering compensation models available in Romania in 2026.
Updated 18 May 2026
Casa Verde Solar — how to land the Romanian subsidy fast
How to land the Casa Verde Solar subsidy when the Romanian program reopens — checklist, timing, documents, rejection reasons, and fallbacks.
Updated 18 May 2026
What is a prosumer in Romania — rights, registration, and a worked example
The legal definition of a prosumer, how to register (installer + DSO + supplier), your rights and obligations, and a worked example for a 5 kWp household.
Updated 18 May 2026
How long until a solar system pays for itself
Real solar system payback in Romania 2026 — break-even for 3.5/6/10 kWp with and without battery, with Casa Verde, with and without heat pump + EV. Concrete numbers + payback calculator anchor.
Updated 13 May 2026
How to start with solar panels — step by step
From the first rough estimate to grid connection as a prosumer: the 8 steps Romanian homeowners go through.
Updated 12 May 2026
Top 10 balcony solar panels — informed picks
Top 10 balcony solar panels for 2026: LONGi, Trina, JA Solar, Jinko, REC, SunPower and others. Real criteria (Wp, efficiency, product warranty, Romania price), not marketing copy-paste.
Updated 12 May 2026
How much does a solar system cost?
2026 real prices for residential systems, what a turn-key quote covers, the Casa Verde subsidy and which factors matter most.
Updated 12 May 2026
Solar Panel Maintenance — Cleaning, Inspection & Service in Romania
How to maintain solar panels in Romania: how often to clean them, when to call a pro, the annual inspection checklist, and 2026 service costs.
Updated 12 May 2026
Balcony solar panel installation — step by step
Practical step-by-step guide for balcony solar panel installation: 5 mandatory pre-purchase checks, materials list, 6 technical steps with tools and torque specs, legal grid connection under 800W.
Updated 12 May 2026
Growatt vs Deye — on budget and DIY
Honest comparison: Growatt MID vs Deye SUN — two cheap Chinese inverters. Verdict: for main residential with normal grid, neither is recommended. Growatt is acceptable for simple on-grid; Deye is the off-grid and DIY standard.
Updated 12 May 2026
Prosumer definition — legal criteria under OUG 163/2022
The legal definition of a prosumer under OUG 163/2022, the concrete criteria (installed power, bidirectional meter, connection contract), and practical examples.
Updated 12 May 2026
Prosumer meter — bidirectional meter replacement in Romania
How the electricity meter is replaced when you become a prosumer in Romania: when the DSO visits, who pays, the step-by-step process, and what to do if things go wrong. Legal deadline: 30 business days.
Updated 12 May 2026
BYD vs Pylontech — which battery for your system
Head-to-head: BYD Battery-Box HVS vs Pylontech US5000 — automotive pedigree vs solid mid-tier, inverter compatibility, cycles, warranty, and Romania 2026 pricing.
Updated 12 May 2026
Panouri solare bifaciale: cum funcționează, avantaje și când le alegi în 2026
Ghid complet despre panourile solare bifaciale — cum funcționează, avantajele față de monofaciale, când câștigă cel mai mult, branduri RO 2026 și calcul concret de ROI.
Updated 12 May 2026
Plug-in balcony solar panels — full guide for Romania
What plug-in kits (balcony solar) are, what Romanian law says, EU comparison, what to buy and avoid, cost and payback.
Updated 12 May 2026
Balcony solar yield — real 12-month measurement Bucharest
Case study: 2× 400W balcony system in Bucharest, measured for 12 months. Real production 964 kWh (92.7% of PVGIS), 85% self-consumption, 3.1-year payback. Monthly tables, real problems, FAQ.
Updated 12 May 2026
Fronius vs SMA — European premium with long warranty
Head-to-head: Fronius Symo GEN24 vs SMA Sunny Tripower — two premium European inverters. Fronius wins on accessory ecosystem (Ohmpilot + Wattpilot), SMA on 25+ year track record.
Updated 11 May 2026
Huawei vs SolarEdge — string vs DC optimizers on the roof
Head-to-head: Huawei SUN2000 (string) vs SolarEdge (DC-optimized) — the difference isn't just brand, it's architecture. Clean roof → Huawei cheaper; shaded or multi-face roof → SolarEdge wins.
Updated 11 May 2026
Huawei vs Sungrow — the two dominant inverters in Romania
Head-to-head: Huawei SUN2000 vs Sungrow SH/SG — the two inverters with 60-70% Romanian market share. The key difference is battery compatibility: Huawei builds an ecosystem with LUNA, Sungrow works with any LFP battery.
Updated 11 May 2026
Sonnen vs Tesla Powerwall — premium tier face-off
Head-to-head: Sonnen eco vs Tesla Powerwall 3 — German engineering with a 10,000-cycle guarantee vs Tesla ecosystem with EV integration. The decision rides on values (engineering vs consumer UX) and your car.
Updated 11 May 2026
Tesla Powerwall vs Pylontech — premium ecosystem vs modular
Head-to-head: Tesla Powerwall 3 (AC-coupled, built-in inverter, Tesla ecosystem) vs Pylontech US5000 (DC-coupled, modular, mid-tier) — architecture, capacities, Romania 2026 pricing.
Updated 11 May 2026
Fotovol newsletter — monthly solar tips
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