Power Outages — A Growing Problem
Power outage frequency in Poland increases every year. Aging grid infrastructure, extreme weather, and system overloads cause multi-hour blackouts even in major cities.
In 2025, the average outage time per consumer was 280 minutes (SAIDI). In rural areas, it reaches 500-800 minutes.
Energy Security Levels
Level 1: UPS + Generator — Basic backup, €230-€700 for UPS, €700-€1,860 for generator. Noisy, requires fuel.
Level 2: Battery Storage — 5-15 kWh lithium battery, €4,650-€12,800. Automatic switchover, silent, zero emissions.
Level 3: PV + Storage + Backup — Solar charges battery during day, battery powers home at night. Theoretically unlimited runtime.
Level 4: Full Off-grid — Autonomous system with PV + large battery + backup generator. Total energy independence.
Battery Technology Comparison
| Technology | Capacity | Lifespan | Cost/kWh | Weight |
|---|---|---|---|---|
| LFP (LiFePO4) | 5 – 30 kWh | 6,000+ cycles | €580 – €930 | 10-12 kg/kWh |
| NMC (Li-ion) | 5 – 15 kWh | 4,000 cycles | €465 – €815 | 7-9 kg/kWh |
| Sodium-ion | 5 – 20 kWh | 3,000 cycles | €420 – €650 | 12-15 kg/kWh |
LFP is the most popular choice for homes. Best balance of price, lifespan, and safety.
How Much Storage Capacity Do You Need?
| Scenario | Hourly use | Required capacity | Hours covered |
|---|---|---|---|
| Minimum (lights + fridge + router) | 0.3 kWh | 5 kWh | 16 h |
| Standard (+ electric heating) | 1.0 kWh | 10 kWh | 10 h |
| Comfort (full home) | 2.0 kWh | 15-20 kWh | 8-10 h |
Island Mode (Off-grid)
Not every inverter supports island mode. Key requirements: hybrid inverter with EPS output, automatic transfer switch (< 20 ms), peak power handling.
FNC Poland designs energy security systems tailored to individual needs — from simple backup to full off-grid.
