Power outages precautions

What helps a grid connected photovoltaic at a power outage? Tips for a photovoltaic helping over a power outage liks in Münsterland.

Endurance for the emergency power supply

The typical emergency power supply for an one family house would be designed for one day without electric power at a restricted comfort level. No electric cooking, festive lighting and other big power users. At an plus energy house should be 3 kWh for one day enough. At a longer power outage, the photovoltaic makes the system more endure.

A 10kW photovoltaic can deliver at an sunny summer day about 60 kWh. But how much at a December day with snowfall and dense clouds? A weather such like in Münsterland as the grid power failed.

Photovoltaic compare
	A 20 Watt crystalline silicon photovoltaic from 1998 vs 3 layer amorphous from Uni-Solar. Under dense clouds, the crystalline PV has no chance.

Extrem difference at dense clouds

Even in the area yield is the triple amorphus cell bettern than my crystalline photovoltaic from 1988. At subjectively the same dense clouds on a December day, the yield from a day can be 0,1 to 0,5 of peak performance. A plus energy house with some batteries is even under this conditions self-support. It's only not possible to cook a banquet with electric power.