To get off the grid with home solar, you need to be able to generate energy when the Sun's out, and store it for when it's not.
Hydrogen: The hottest topic in the energy sector
Hydrogen is shaping as an important part of the future clean energy mix, but exactly where and how will it fit? Here's a rundown of the latest news from this important sector, from transport to production to home hydrogen batteries.

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Scania is scaling back its fuel cell big-rig research and development operations in favor of battery-electric power.
One of the key issues making hydrogen less attractive than batteries for EV use is distribution.
German multinational Thysenkrupp has won the contract to build and operate a huge hydro-electrolysis facility in Quebec.
With the move towards electric aviation comes new opportunities to explore what a powertrain looks like, and Airbus is experimenting with a new design that builds entire hydrogen propulsion units into...
NuScale Power has released the results of a new evaluation that indicates that a single small nuclear NuScale Power Module (NPM) could economically produce almost 50 tonnes of hydrogen fuel per day.
UK gas distributor SGN has been given approval to supply hydrogen produced using renewables to around 300 Scottish homes.
Oil giant Shell is planning the biggest wind-to-hydrogen project in Europe, a colossal 10-gigawatt offshore wind farm in the North Sea.