First of all, if you use it for your own house, please make a survey of the total power of electrical appliances in your home (the power and quantity of each electrical appliance) and the daily electricity consumption. After you inform our sales staff, we will provide a suitable system configuration. If the above two are not clear, we will provide a general system for your reference. If it’s a commercial system, please inform our sales staff of the daily electricity consumption, total loads of power, and voltage. Our engineers will give you a suitable commercial system solution.