Porridge is no problem

Boiled vegetables: Chinese cabbage, pumpkin, sweet potato, potato (with appropriate amount of salt), tofu, vermicelli, carrot, stewed tofu with tomatoes, poached eggs, whatever.

Generally speaking, Chinese cabbage, pumpkin, sweet potato, potato (salt), bean curd, vermicelli and carrot are fried with a little oil, boiled in water and seasoned with salt, which is delicious.

500W electrical appliances use 0.5 kWh an hour. Don't worry.