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TL;DR
Islanding mode allows your installation to operate during a network outage. Requires hybrid inverter + battery + activated 'backup' function. Transition depending on equipment. Not standard on all inverters — check before purchase.
Definition
Island mode is the ability of a PV installation with battery to operate autonomously, disconnected from the network, in the event of a breakdown.
Network→island transition
According to system
Required
Battery + hybrid inverter
CH network outages
< 1h/year
ESTI standard
NA-Schutz
In islanding, the inverter creates a local micro-grid now 50 Hz / 230V without a network reference. Requires an inverter specifically designed for this function. Huawei SUN2000 + LUNA2000 and Enphase IQ8 + IQ Battery support islanding. ESTI (NA-Schutz) compliance required.
Network outages in Switzerland: < 1 hour/year on average. Particularly valued by rural owners or people with sensitive equipment. The installer must activate and test the function correctly.
Related guides
No. Look for 'Island mode', 'Off-grid mode' or 'Backup mode' in the datasheet. Huawei SUN2000 + LUNA2000: yes. Enphase + IQ Battery: yes. Fronius GEN24 with battery: yes.
Typical residential: 3–5 kW. Enough for refrigerator, lighting, wifi, a few sockets — but not for electric water heater or heat pump.
Sources & method
Check equipment values in the offered model’s datasheet and warranty terms. Confirm grant, permit and connection requirements with the responsible programme, municipality and grid operator.
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