Hey. I also encountered a similar problem.Refrigerator, TV, electric stove, lighting systems must be the most modern, economical - to have enough electricity from solar panels. This technique is not cheap. For such refrigerators it is desirable to have a pure sine. From the modified, it will work too, but there is a risk of premature failure of the refrigerator. Sometimes the refrigerator can not start. The inverter with a modified sine for the refrigerator is bought when the budget does not allow a clean sine, they are much cheaper, for example, at 1000 watts 12V. The inverter is a pure sine at 12V , usually more than 2-3 times. Dry residue - a modified sine pulls the refrigerators.But if you have money, it will be better to buy a pure sine.
https://grapefrost.com/chest-freezers/
