A Japanese group was able to charge a Li-ion secondary battery with DC power generated by solar cells and supply it to home appliances without using AC conversion.
The test was part of the Development Project of Energy-saving Technologies for Weak Energy Storage Type Eco House.
The program was conducted by Japan’s Ministry of the Environment with an aim of developing technologies to prevent global warming.
Until now, existing home-use solar power systems converted DC power into AC power before supplying it to homes. Power generated by solar cells had to be converted twice because home appliances use DC power.
This new system can boost efficiency use because it directly supplies generated power without converting it, much less converting it twice.
CO2 emissions generated by a typical home over a period of four hours can be cut by 40%.
Next up, a wooden laboratory building that uses the DC power supply system by 2010.
Get this – the group aims to cut CO2 emissions by charging Li-ion secondary batteries with hydroelectricity generated by:
- a waterwheel set in the drain in the bathroom
- by a light breeze that blows through a room
- by a man riding on a fitness bike.