... /yellow(color can be choosed). It's used to fill in storage batteries, inverter,controller, power, fuse etc. 1Set 800w solar ... . If can produces 4000WH at maximum in area full of sunshine such as in Nigeria, Congo, Philiphine, India, Malaysia, etcb). How to connect ... connection. When get product, just need to put storage batteries in cabinet and connect cables to storage batteries, and open switch ...