How to start with solar panels — step by step

Step 1 — Start with a rough on-site estimate

Before calling an installer, get a sense of system size. Use the capacity calculator to learn roughly how many kWp you need based on your monthly consumption. Then use the positioning estimator to see how many panels fit on your roof.

If you want the full payback math — ROI, cashflow, break-even, grid dependency — see the payback calculator. Input your real consumption + county + whether you have battery/heat pump/EV, and you get every number instantly.

The numbers are indicative — a starting point for the installer conversation, not a binding cost.

Step 2 — Find a validated installer

List only installers with AFM validation (needed for the Casa Verde subsidy) and ANRE accreditation (needed for grid connection). The county pages filter the list for you; see how to choose the right installer for concrete criteria (reviews, portfolio, geographic distance).

Step 3 — Request a written quote based on your needs

Send the installer your average monthly consumption (from your bill), plus any future plans: electric vehicle, heat pump, extra AC units. A good quote includes recommended kWp, specific panels (brand + watt), inverter, optional battery, prices with and without the Casa Verde subsidy, and timeline.

Use the quote request form to reach 2–3 installers in your area. For pricing context, see how much a solar system costs.

Step 4 — On-site evaluation

Before you sign, the installer visits you for a technical inspection. They measure the actual roof, assess structure (can it bear the weight?), trace DC + AC cable paths, measure the distance to the electrical panel, and identify obstacles (Velux windows, dormers, chimney, antennas).

This is where the panel positioning decision is finalised — which slope, what orientation, what mounting structure. The online estimate from step 1 is just a starting point; the actual configuration emerges after the visit.

Step 5 — Verify your current power limit (single-phase vs three-phase)

The system is bounded by your service type:

• Under 6 kW — clearly single-phase, no issue.
• 6–9 kW — caution zone; depends on the main breaker.
• Over 9 kW — three-phase required.

If you don't know what you have, see how to identify your electrical service. For technical details and what it takes to upgrade, read single-phase vs three-phase.

Step 6 — Battery decision

A battery is optional and the most expensive component per kWh stored. It's justified if:

• you have frequent blackouts and want autonomy,
• your consumption is heavy in the evening / overnight (when panels don't produce),
• your supplier has an injection cap below your annual consumption.

It's not justified if you consume during the day (AC, dishwashers) and have full quantitative offsetting. For types and brands, see solar battery brands.

Step 7 — Casa Verde subsidy (if applicable)

The cap is 20,000 RON under the AFM Casa Verde Fotovoltaice programme. The money doesn't go to you — it goes directly to the installer after the system is commissioned. You pay the difference. The application is filed by the installer on your behalf during an active AFM session.

See how the Casa Verde subsidy works for criteria and steps.

Step 8 — Installation → grid connection → prosumer status

The installation itself takes 1–2 days for a standard residential system. Then comes the grid connection — the distribution operator swaps your meter for a bidirectional one and issues the technical approval. The whole process takes 30–60 days.

After connection you become a prosumer and enter net metering: you pay only the net difference between consumed and injected kWh. See what it means to be a prosumer for how compensation works.

Quick start

If you're still exploring, start with the capacity calculator. If you already know what you need, request a personalised quote.