I bought one of these systems a year back. It doesn’t work as specified. The changeover from EPS back to mains is too slow and results in all electronic equipment restarting. This can cause damage to computers etc. The installer’s solution was to supply small backup UPS’ for each electronic device. Unsatisfactory solution I’m my opinion. The importers are not helpful in the least. The device was returned for testing and supposedly nothing wrong however it was returned with the casing damaged and the problem still persists. If I could I would return and buy something else. A pretty package that’s all.