As snowflakes gently settled on his balcony solar panels on a cold winter's day, Berliner Jens Sax checked his smartphone to see how much electricity they were generating. Far less powerful than ...

EcoFlow is testing new features for its PowerStream solar system that could be available through a subscription.

As snowflakes gently settled on his balcony solar panels on a cold winter's day, Berliner Jens Sax checked his smartphone to see how much electricity they were generating. The amount was modest now, ...