How many panels for a home?

10 kWh/day ÷ 3.5 peak hours ≈ 3 kW — 8–12 panels of 400 W.

On-grid sells surplus (no battery); off-grid is fully independent; hybrid does both.

Yes — type 2 at the intake, type 1 with lightning protection (IEC 62305).

Solar power plants: types and calculation

Solar stations: on-grid, off-grid and hybrid; panel and inverter sizing, batteries, SPD protection and safety.

Cable cross-sections and ampacity Circuit breaker ratings Electrical schematic symbols (GOST/IEC)IP protection ratings RCD types and selection Earthing systems TN-C, TN-S, TN-C-S, TT, IT Wire colour code Breaker selectivity Generator selection: petrol or diesel ATS and backup power UPS: types and selection Solar power plants: types and calculation 🌍 World rules

Types

Type	Grid	Battery	How it works
On-grid	Yes	No	Sells surplus to the grid
Off-grid	No	Yes	Fully independent
Hybrid	Yes	Yes	Grid + solar + battery backup

Calculation

Panels: P = daily consumption / peak sun hours (3–4 h in central Russia winter, 5–6 summer). Inverter: 80–120% of simultaneous load. Battery: C = night energy / (0.7 × system voltage).

Note: tilt ≈ latitude, orientation south, avoid shading.

Safety

SPD type 2 at the intake; type 1 with lightning rods;
30 mA RCD on AC; anti-islanding mandatory for on-grid;
Panel and structure earthing; net metering contract.

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Data is for reference. Final design decisions must follow current regulations and a qualified engineer.