In most cases, no. A solar panel system in Singapore often involves a grid-tied setup that does not require batteries since you can sell excess solar energy generated back into the grid. When there is sunlight, your home will first consume the solar energy generated by your system for power, and automatically draw electricity from the grid if your energy consumption exceeds what is generated. At night, when your system is not generating energy, your house will tap on power from the grid like usual and you’ll not experience any electrical outages. The end result? You save on electricity since you consume much less from the grid.