Small solar panels that can be installed on an apartment balcony and plugged into a wall outlet are bringing the green revolution into the hands of Germans without requiring large investments, an electrician or heavy tools. More than 500,000 systems have been installed. Janik Nolden, who together with two friends founded Solago, a German start-up that sells rooftop solar panels and the plug-in versions, said most of his customers were interested in installing the panels on their own. The company has grown from a small storefront to a warehouse, with 50 employees helping to ship eight trucks worth of deliveries across the country and into neighboring Austria. Elsewhere in Europe, plug-in solar panels are popular in the Netherlands, and interest is growing in France, Italy and Spain. Apps allow users to check how much electricity they are producing at any given time.

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