For long-term home-office or home-continuous personnel activities, the energy output by the balcony photovoltaic can be used more than 70%, maximising the product benefit. If it is a normal office worker, only refrigerators are available during the day and other fixed loads continue to consume energy, and PV modules are mostly de-energised between 10:00 and 14:00, so the total energy saving effect can be in the range of about 30% to 50%.