How many things do I need if I want a solar system for my house?

Normally, you will need some solar panels, an inverter, a controller and some batteries.

How big solar panels and inverter should I use?

Generally, it depends on the equipment you are going to use. If you just want to use a TV, some lights, we will recommend you at least a 300W system, but 600W will be better. If you also want to use a fridge, we will recommend you a 1000W system.

Why some of your inverters are more expensive?

The expensive ones are pure sine. If you want to use TV, fridge or such kind of equipment, we will recommend you to take those pure sine inverters, in case the inverter damage your equipment.