Mircea Marius
Ploiești, Prahova
6 kWpCanadian 455WGrowatt 6000On-grid
Portfolio
108 systems installed, documented with real data
We have installed 108 photovoltaic systems across 8 counties in Romania. Below you will find 12 representative projects — real client, location and equipment — plus a hybrid case study monitored for 7 months, with actual production compared directly against the estimate and with verified savings and payback.
108
Projects completed
126+
kWp installed
8
Counties covered
2 years
Installation warranty
Matei Georgeta
Băneasca, Giurgiu
8 kWpSharp 410W ×20Single-phaseOn-grid
Mertic Nicolae
Razvad, Dâmbovița
6 kWpSharp 410W ×15Single-phaseOn-grid
Mihalache Emilian
Drăgănești, Olt
8 kWpJinkoDeyeThree-phase
Petea MarinCase study
Slatina, Olt
9 kWpJinko 435WBattery 10kWhSheet metal
Anghel Marius D.
Nanov, Teleorman
10 kWpAiko 440WDeye Three-phase
Lucian Purcarus
Cornetu, Ilfov
6 kWpSingle-phaseBattery 5kWh
Moraru Cătălin
Găești, Dâmbovița
8 kWpSingle-phaseHybrid
Teodorescu
Bucharest, Sector 6
20 kWpAiko 440WHuawei 17kW
Kiss Duo Premium SRL
Cornu, Prahova
Aiko 440WGrowatt 20kW
Ionescu Valentin
Vidra, Ilfov
15 kWpJinko ×36Huawei 12kW
Rusu Florin
Brașov
10 kWpJinko ×23Three-phase HybridCeramic tile
We show 12 representative projects out of the 108 completed. All data is real — client, location, installed equipment. Case studies with monitored production data are published a minimum of 6 months after commissioning.
Real case study — verified data
Petea Marin — Slatina, Olt
Residential hybrid system 9 kWp + 10 kWh storage · Monitoring: Aug 2024 – Feb 2025 (7 complete months)
Installation profile
Client type
Residential — single-family house
Location
Slatina, Olt county
System type
Hybrid (on-grid + battery storage)
Installed power
9.135 kWp (21 × 435W)
Battery capacity
10.24 kWh LFP
Roof type
Profiled sheet metal, South exposure, 30°
Panel area
∼38 m²
Installation date
July 2024
Installation type
Three-phase
Installed equipment
Panels
Jinko JKM435N-54HL4R-V ×21
Inverter
Deye SUN-10K-SG04LP3 (10kW hybrid)
Battery
Dyness B4850 (10.24 kWh, 51.2V LFP)
BMS
Dyness integrated, CAN communication
Mounting structure
Anodized aluminium, roofing screws
DC wiring
Solar cable 4mm² EN 50618, MC4
Monitoring
Solarman Business (Wi-Fi)
Prosumer dossier
ELECRO → DELGAZ, approval obtained in 24h
Monthly production — estimated vs. actual
Data extracted from Solarman Business — 7 complete months (Aug 2024 – Feb 2025). The estimates come from the PVGIS simulation for the site coordinates in Olt county.
Estimated
Actual (≥ estimate)
Actual (below estimate)
Total estimated (7 months): 5,580 kWh
Total actual (7 months): 5,585 kWh
Cumulative deviation: +0.1%
Actual production over 7 months practically on target (+0.1% vs. estimate). The maximum monthly deviation was −7.6% in December 2024, caused by high cloud cover and two days with a snow layer on the panels (12–13 Dec 2024).
Consumption coverage & independence level
| Indicator | Value | Note |
|---|---|---|
| Annual family consumption | 6,200 kWh | Previous supplier bill data |
| Projected annual production | 11,250 kWh | Extrapolated from 7 real months + PVGIS |
| Direct self-consumption + battery | 5,200 kWh (84%) | Of the family’s total consumption |
| Energy injected into the grid | 6,050 kWh | Prosumer credit 1:1 until 31.12.2030 |
| Energy drawn from the grid | ∼1,000 kWh | Jan–Feb, months with a negative balance |
| Energy independence level | 84% | Hybrid with 10 kWh battery |
| Battery utilization (daily average) | 92% | Full day/night cycling |
| Maximum inverter efficiency | 97.8% | Recorded by Solarman, peak day in July |
Savings & payback period
Total system cost
43,500 RON
∼8,760 EUR · equipment + installation + prosumer dossier
Net cost — after Casa Verde voucher
23,500 RON
After deducting 20,000 RON AFPN (VAT included)
Projected annual benefit
8,720 RON
Self-consumption 5,460 RON + prosumer credit 3,260 RON
Payback period
2.7 years
With Casa Verde subsidy · Without subsidy: 5.0 years
| Component | Calculation | RON / year |
|---|---|---|
| Direct self-consumption + battery savings | 5,200 kWh × 1.05 RON/kWh | 5,460 RON |
| Prosumer credit accrued with the supplier | 6,050 kWh × 0.54 RON/kWh (average) | 3,267 RON |
| Energy bought from the grid (remaining) | 1,000 kWh × 1.05 RON/kWh | −1,050 RON |
| Net annual benefit | — | 7,677 RON |
After 7 months of operation, the cumulative savings are ∼4,240 RON, including the prosumer credit accrued with the supplier. At the current fixed tariff, the net investment of 23,500 RON is recovered in 2.7 years. With an annual tariff increase of 5% (2020–2024 trend), the payback drops to 2.4 years.
Conclusions & technical observations
- Production on target: the cumulative 7-month deviation vs. estimate is +0.1% — the PVGIS model calibrated for Olt proved extremely accurate for this site.
- The battery significantly improves independence: versus a pure on-grid system (estimated 65% coverage), the 10 kWh battery raised coverage to 84% annualized.
- The Deye three-phase hybrid inverter: maximum recorded efficiency 97.8%; zero errors or restarts in 7 months of continuous operation.
- Behaviour during power outages: 3 grid outages recorded in Olt over 7 months, each handled automatically in backup mode — switchover <20ms, with no impact on the household loads.
- Zero corrective interventions: no technical intervention was required in 7 months. A single panel-cleaning cycle is planned for March 2025.
- Winter season note 2024–2025: December produced 7.6% below estimate due to high cloud cover and two days with snow on the panels (12–13 Dec). Production returned to normal immediately after the thaw.
Want a documented system like this?
Start from an indicative estimate, and if we go further, your system can become our next case study, with your real data.