Solar panels
Monocrystalline and bifacial panels with efficiency above 22%, a 25–30 year product warranty and 10–12 years on rated power.
AikoCanadian SolarJinko SolarLONGiSharpAE Solar
Services
Our services
From certified equipment and ANRE-authorized installation, to the prosumer dossier, turnkey solar parks and maintenance — everything you need for a solar system that performs for years.
Equipment
Solar equipment sales
A certified portfolio, manufacturer-backed warranties and the top brands on the European market — every component ships with complete technical documentation.
Inverters
String and hybrid inverters with smart monitoring, compatible with on-grid, hybrid and off-grid setups, with Wi-Fi/RS485 communication and mobile apps.
HuaweiFroniusDeyeGrowatt
Storage systems
LiFePO₄ batteries with integrated BMS, over 6,000 life cycles, compatible with the major hybrid inverters on the market.
DeyeDynessFelicityLivoltek
Solar installation
Solar PV system installation
ANRE-authorized teams, any roof or ground configuration, from project to grid connection. We stay with you from the first consultation to commissioning and prosumer registration.
On-grid grid-connected
Produces solar energy and consumes it in real time; the surplus is injected into the grid and credited by the supplier (1:1 offsetting guaranteed by law until 31.12.2030). No batteries.
Benefits
- Lowest upfront cost — no batteries needed
- Fast payback (4–6 years est.)
- Bill reduced by 70–90% in sunny months
When it fits
- Homes with high daytime consumption
- Limited budget, payback as priority
- Areas with a stable grid
During an outage the system shuts down automatically (anti-islanding protection). It does not work without the grid.
Hybrid with storage
Combines PV production with a hybrid inverter and batteries. By day it produces and stores the surplus, at night it draws from the battery, and any remaining surplus is injected into the grid.
Benefits
- Partial independence (50–80% night coverage)
- Works during outages (backup)
- Maximum bill reduction, including at night
When it fits
- High night consumption (heat pump, EV)
- Areas with frequent outages or instability
- Ready for the 1:1 offsetting expiry after 2030
Off-grid autonomous
A system fully independent of the grid: panels, an off-grid inverter, high-capacity batteries and, optionally, a backup generator. Not grid-connected — no prosumer dossier needed.
Benefits
- Total independence — zero electricity bill
- Works in locations with no grid access
- No distribution charges or grid tariffs
When it fits
- Cabins, farms, isolated properties
- Sites where grid connection is too costly
- Agrivoltaic projects, tiny houses, microfarms
Requires more complex sizing and high-capacity batteries. Higher upfront cost than on-grid or hybrid.
Key differences between systems
| Criterion | On-grid | Hybrid | Off-grid |
|---|---|---|---|
| Batteries included | No | Yes | Yes (high capacity) |
| Works during an outage | No | Yes (backup) | Yes (permanent) |
| National grid required | Yes | Yes | No |
| Relative upfront cost | Lowest | Medium | Highest |
| Payback time (est.) | 4–6 years | 6–9 years | 8–12 years |
| Bill reduction | 70–90% | 85–100% | 100% (no bill) |
| Prosumer dossier | Required | Required | No (off-grid) |
Solar installation
Single-phase vs. three-phase installation
Before choosing your solar system it is essential to know your building’s electrical installation type — single-phase or three-phase. You can check it on the consumer unit or your distributor contract, and it directly affects the power you can legally install.
A single-phase installation (230V, one phase) is typical of apartments and small-to-medium homes, while three-phase (400V, three phases) is found in large houses, new buildings and commercial or industrial spaces. ELECRO checks your installation type during the free consultation and recommends the optimal inverter configuration.
- Single-phase: maximum PV inverter power of 6–8 kWp (ANRE connection limit)
- Three-phase: large installed power (>10 kWp), balanced across the 3 phases
- Three-phase is required by the distributor for systems above 10 kW
- Three-phase is recommended for EVs and heat pumps
Single-phase vs. three-phase at a glance
| Criterion | Single-phase | Three-phase |
|---|---|---|
| Voltage | 230V (1 phase) | 400V (3 phases) |
| Max. PV system power (ANRE) | ≤ 6–8 kWp typical | No practical limit |
| Typical for | Apartments, small–medium homes | Large homes, commercial, industrial |
| Inverter required | Single-phase | Three-phase |
| Distributor requirement | Systems ≤ 10 kW | Systems > 10 kW mandatory |
| Suited to EV / heat pump | Partial (low power) | Yes, recommended |
Solar installation
Accepted roof types
We install on any roof or ground configuration, with mounting structures tailored to each surface.
- Ceramic and concrete tiles
- Profiled and flat sheet metal
- Bitumen and PVC membrane (flat roofs)
- Ground (ground-mounted tilted structures)
- Industrial structures and warehouses
Solar installation
From project to grid connection
An end-to-end process, with timelines communicated at every stage.
1. Free consultation & energy audit
We analyse your consumption, roof, panel orientation and electrical installation type.
2. Personalized quote
A detailed technical configuration with simulated yields and an estimated payback time.
3. ANRE-authorized installation
Our own technical team, ANRE-authorized, with civil liability insurance.
4. Prosumer dossier & connection
We handle all the required documentation, standard turnaround 24h.
5. Commissioning
Testing, configuration and training on the monitoring app.
Inverters & Batteries
Inverter & battery installation
We install, replace or upgrade inverters and batteries in existing systems — without replacing the whole system. Ideal for turning an on-grid system into a hybrid one or upgrading an underperforming one.
Available services
- Faulty inverter replacement — fast diagnosis, replacement with compatible equipment and a final functional test.
- Adding a battery to an existing system — turning an on-grid system into a hybrid one by adding a storage module and a hybrid inverter.
- Power upgrade — replacing the inverter with a larger one for systems later extended with additional panels.
- Periodic check — electrical and functional inspection of the inverter and battery per IEC 62446-1.
Equipment compatibility
We work with every major inverter and battery brand on the Romanian market. We verify compatibility before ordering and give objective technical recommendations, without being tied to a single manufacturer.
HuaweiDeyeFroniusGrowattDynessFelicityLivoltek
Prosumer dossier
Prosumer dossier preparation
We handle the prosumer dossier end to end, from the first signature to the final connection approval. Our standard documentation turnaround is 24 business hours from receiving the client’s documents.
We submit the dossier to the relevant distributor (DELGAZ, DEO, RE or other) and follow the process through to approval.
- Completed and signed connection request
- Authorized technical execution project (PTE)
- Single-line diagram of the installation
- Technical datasheets of the installed equipment
- Commissioning report
- Energy performance declaration
Process steps
1. Collect client documents
ID, proof of ownership, latest electricity bill, installation technical data.
2. Prepare documentation (24h)
Technical project, single-line diagram, equipment datasheets.
3. Submit to the distributor
To DELGAZ, DEO, RE or the relevant local distributor.
4. Track approval & connection
We liaise with the distributor and keep the client informed in real time.
5. Prosumer contract
We support signing the contract with your chosen energy supplier.
Maintenance
Maintenance & cleaning of PV systems
A dirty or uninspected system can lose 20–30% of its yield per year. We offer preventive and corrective packages to keep production at the guaranteed optimal parameters.
Inspection types
- Thermal drone inspection — detecting hot spots, faulty cells or burnt bypass diodes (per IEC TR 56257).
- Electrical check — voltage, current and insulation resistance measurements per IEC 62446-1.
- Performance report — production vs. estimate, PR (Performance Ratio) and system availability (IEC 61724-1).
- 24/7 SCADA monitoring — continuous supervision with automatic alerts on production deviations.
Professional cleaning
Cleaning with demineralized water and specialized equipment, without risking surface damage or panel warranty loss. Robotic cleaning capacity: ~2 MW/day.
Maintenance packages
Residential (<50 kWp)
- 1–2 cleaning campaigns/year
- Annual electrical inspection
- IEC 61724-1 performance report
- PR warranty >75%
- System availability 97%
Industrial (>50 kWp)
- 4 maintenance campaigns/year
- 3 cleaning campaigns/year
- Thermal drone inspection
- 24/7 SCADA monitoring
- PR warranty >78%
Production reference in Romania: 1,200–1,500 kWh/kWp/year. A well-maintained 10 kWp system produces 12,000–15,000 kWh per year — the average consumption of 4–5 households.
Business or agricultural projects
Have a business or agricultural project? ELECRO also designs and builds turnkey solar parks (EPC) for companies — commercial, industrial and utility-scale. Details on our business site.
Portfolio
A portfolio of real projects
No mock-ups — real, documented projects across different counties and different roof types.
108
completed projects
30+
counties covered
22%+
panel efficiency
2 yrs
installation warranty
Let’s talk about your project
A free, no-obligation consultation: we tell you which service fits you, the savings you make and how fast your investment pays back.