Fotovol Guide — Q&A
Short answers to the most common questions about solar panels, the Casa Verde program and real-world costs.
Huawei LUNA vs BYD — premium battery for a complete ecosystem
Head-to-head: Huawei LUNA2000 vs BYD Battery-Box HVS — two premium LFP batteries; decision hinges on your inverter (Huawei vs Fronius/SMA/Goodwe) and target capacity.
Updated 11 May 2026
Prosumer vs independent producer — which regime to choose
The difference between prosumer and independent producer in Romania — power threshold, fiscal regime, ANRE license, and criteria for choosing.
Updated 11 May 2026
Pylontech vs Huawei LUNA — which battery for your system
Head-to-head comparison: Pylontech US5000 vs Huawei LUNA2000 — inverter compatibility, cycles, warranty, and Romania 2026 pricing. The right pick depends on the inverter you already own.
Updated 11 May 2026
Single-phase vs three-phase inverter — which to choose for solar
The difference between single-phase and three-phase inverters, the 6-9 kW technical threshold, inverter + new DSO connection costs, popular brand compatibility on the RO 2026 market, and decision criteria.
Updated 11 May 2026
Dyness vs Pylontech — which battery is better for solar?
Dyness Powerbox G2 vs Pylontech US5000 compared on capacity, cycles, warranty and Romania pricing. Same LFP chemistry, different trade-offs — we tell you which one we would pick.
Updated 18 May 2026
How to integrate solar, heat pump, and EV — a complete guide to a renewable home
How to plan the electric ecosystem of a renewable home — solar, battery, heat pump, EV, smart home — with a concrete reference build for a typical RO 2026 home.
Updated 1 May 2026
What is the optimal tilt angle for solar panels?
For Romania the ideal tilt is 30–35° facing south, but you lose under 5% anywhere between 15° and 45°. Plus what to do on flat or very steep roofs.
Updated 28 April 2026
Generic LiFePO4 OEM batteries — off-grid budget, skip for residential
The "generic LiFePO4 OEM" umbrella covers dozens of Chinese brands (KSTAR, Felicity, etc.) with good cell chemistry (CATL/EVE) but uneven BMS quality. Warranties on appear-and-vanish factories are illusory. Acceptable only for off-grid cabins, greenhouses, workshops.
Updated 26 April 2026
Fox ESS batteries — calculated bet on the all-Fox combo
Fox ESS (China, 2019) makes HV/LV LFP batteries with native Fox H1/H3 integration. Grew fast in UK and Australia. Moderate Romanian presence. Priced 10–15% below Pylontech, but the brand is young. Recommended as an all-Fox package with a distributor who has track record.
Updated 26 April 2026
Dyness batteries — cheaper Pylontech, thinner service
Dyness (China, 2017) makes stackable LFP batteries, priced 10–15% under Pylontech at similar quality. Narrower inverter compatibility list. Acceptable on tight Mid budget with a distributor who has Dyness history and a simple inverter + 5–10 kWh storage system.
Updated 26 April 2026
Victron LiFePO4 batteries — the natural pick in a 100% Victron stack
Victron Smart Lithium LFP batteries with native integration into MultiPlus / Quattro inverters. Pick for a 100% Victron stack or off-grid with advanced monitoring. Premium over Pylontech, justified by integration and reliability. Skip on non-Victron inverters.
Updated 26 April 2026
Pylontech batteries — the Mid default for non-Huawei systems
Pylontech (China, 2009) is the Mid default for non-Huawei systems. Force-H2 (HV) and Pelio-L (LV) cover the full residential spectrum. Broadest compatibility (Sungrow/GoodWe/Solis/Victron). 10-year warranty, reliability proven by sheer volume.
Updated 26 April 2026
BYD Battery-Box — automotive-grade for longevity
BYD (China, 1995) is an EV giant making Battery-Box Premium HVS/HVM LFP storage, modular 5–22 kWh. Automotive-grade quality, tested in Tesla and BYD cars. Slight premium over Pylontech, recommended for 15+ year use plans.
Updated 26 April 2026
Huawei LUNA2000 batteries — the Huawei ecosystem default
Huawei LUNA2000 (launched 2020) is a modular 5/10/15 kWh LFP battery, the most-installed in the Romanian Mid bracket. Native integration with SUN2000. 10-year warranty / 60% capacity. Verify the firmware version (S0 vs S1) before buying.
Updated 26 April 2026
Sonnen batteries — German quality for data lovers
Sonnen (Germany, 2010, Shell-acquired 2019) makes LFP batteries with a 10-year / 10,000-cycle warranty — the most aggressive in the industry. Granular software with P2P trading. Limited Romanian distribution. Justified for data enthusiasts, not for typical houses.
Updated 26 April 2026
Tesla Powerwall — top-tier premium for the Tesla ecosystem
Tesla Powerwall 3 (2024) integrates a hybrid inverter + 13.5 kWh battery in a single wall unit. ~3× the price of a comparable Pylontech. Justified if you have a Tesla car, > 15,000 kWh/year consumption, or want premium UX. Demand a certified Tesla partner in Romania.
Updated 26 April 2026
Deye inverters — off-grid and DIY, skip for residential
Deye (China, 2007) makes low-cost hybrid and off-grid inverters, popular for DIY and agricultural systems. Partial official EU support. Acceptable for cabin, greenhouse, barn. Avoid on a normal-grid primary residence.
Updated 26 April 2026
Sofar Solar inverters — low budget, skip for hybrid
Sofar Solar (China, 2013) is a very-low-price brand. Works decently in early years but ages faster than Huawei/Sungrow. Recommended only for simple on-grid sub-5 kWp. Avoid for hybrid + battery.
Updated 26 April 2026
Senergy inverters — extreme budget, but watch reliability
Senergy (Sineng) is a Chinese volume brand entering Romania through lowest-price distributors. Uneven quality, many failures in the first 2 years. Acceptable only for sub-3 kWp cabin or DIY low-budget installs.
Updated 26 April 2026
GoodWe inverters — battery flexibility
GoodWe (China, 2010) is solid on EH/ET hybrid inverters, compatible with Pylontech, BYD, Dyness and others. Good pick when you want battery flexibility beyond Huawei LUNA. SEMS Portal app is rougher than FusionSolar.
Updated 26 April 2026
Growatt inverters — tight budget, but check replacement time
Growatt (China, 2010) is popular on sub-10 kWp Romanian installs because of pricing. Acceptable quality, but higher failure rates than Huawei/Sungrow. Acceptable for simple 3–5 kWp on-grid with a distributor holding local replacement stock.
Updated 26 April 2026
Solis (Ginlong) inverters — cheaper Huawei for small projects
Solis (Ginlong, 2005) is an inverter-only specialist. EUR 200–400 below Huawei at similar quality. Good for 3–8 kWp Casa Verde systems. Verify your distributor's ability to push remote firmware updates.
Updated 26 April 2026
Victron Energy inverters — the reference for off-grid and serious backup
Victron Energy (Netherlands, 1975) makes top hybrid and off-grid inverters. MultiPlus-II + Cerbo GX is the off-grid standard. Recommended for unstable-grid, full off-grid, or technical buyers. Overkill for simple on-grid under 6 kWp.
Updated 26 April 2026
Sungrow inverters — the serious Huawei alternative
Sungrow (China, 1997) is the oldest Chinese inverter maker, direct Huawei competitor. Recommended for three-phase hybrid 8–15 kWp systems. Multi-brand battery compatibility (BYD/Pylontech), warranty extensible to 20 years.
Updated 26 April 2026
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