The featherweight flying machine had been exposed to the elements since its arrival in the central city of Nagoya on Monday night, with crew having to hold it down to prevent it being blown away by the wind.
"#Si2 is safe in the mobile hangar!" @solarimpulse tweeted today, saying support staff had worked through the night to put together the sections of an inflatable tent that looks a little like a series of connected igloos.
The seventh leg of its epic mission was intended to be the 8,500 kilometres from Nanjing, China, to Hawaii -- a journey set to take six days and six nights of non-stop flight.
But a developing cold weather front in the Pacific forced mission controllers to order pilot Andre Borschberg to divert to Nagoya, unexpectedly adding Japan to the tour.
Also Read
The presence of the aircraft continued to be a draw to the people of Nagoya, with a steady stream of locals appearing at the edge of the airfield to try to get a glimpse.
"I thought it may fly today because the weather has got a little sunnier, but it's still covered up in the hangar," she said.
"I am glad I came to to see it though, because this kind of thing might only happen once in a lifetime."
In a telephone interview with AFP yesterday, mission initiator Bertrand Piccard said crew members had been holding on to the delicate solar craft since it arrived in Nagoya.
"The plane has a huge surface area and is very light, with a take off speed of just 45 kilometres an hour, so with gusts of wind like today you really need to hold on to it," he said.