Japanese households shopping for rooftop solar and home batteries are driven mainly by electricity costs. An August poll by iChoosr, which runs group-buying campaigns for solar and storage, put bill reduction first for 48% of respondents, while 19% pointed to disaster resilience, pv magazine reported.
The respondent pool numbered 14,478, drawn from 24 prefectures. All had signed up for iChoosr's "Minna no Ouchi ni Taiyoko" ("Solar for Everyone's Home") campaign, with sign-ups running from Feb. 25 to July 23, according to pv magazine.
A March poll by the solar and battery marketplace operator Goodfellows produced a similar ordering. Among solar owners weighing a battery purchase, 51.9% pointed to electricity savings in 2025, up from 39.3% in 2022, pv magazine reported.
Expectations of what the hardware will actually do skew the same way. Residential installer ECODA surveyed households in 2025 and found 76% expecting solar-plus-storage to cut electricity costs, with 49.1% expecting backup power in a disaster, according to pv magazine.
Behind the cost focus sits the end of guaranteed export payments. Japan's Ministry of Economy, Trade and Industry (METI) counted roughly 530,000 residential solar systems, about 2 GW, exiting the feed-in tariff (FIT) scheme during November and December 2019 alone, pv magazine reported. Once a FIT contract expires, the owner loses the fixed export price and must either accept a lower rate for exported power or keep it on site.
The group-buying channel has built up a sizeable pipeline. iChoosr counts more than 110,000 household registrations in Japan since 2019 and more than 10,000 completed installations, according to pv magazine.