Although it was used for photovoltaic power generation, there are disadvantages that it is fairly hard and inconvenient to use, but the durability against high amperage is strong, the weather improves suddenly, even if high ampere power is generated, the place that does not do it is advantageous did. In terms of security and safety, I think that it would be better to have the margin of choice, and if it is to be added in the future, if it is within the allowable range of wiring, it can be raised to some extent. If the power operation is not performed within the allowable range of the actual wiring, the wiring is burned and there is no meaning to be installed, so it was the result which reached the present. But I think that safe and secure was obtained by choosing 600vCVT this time.