We believe this is a the most efficient and reliable unit available and sets the standard for all others to follow. Very keenly priced to cater for mass market adoption of the solution and has been made to suit all pockets. Make best use of your power. Every kilowatt you don't use means more of your electrical requirement is being met by your solar system VO works day and night and you will use less energy even when the sun is not shining. VO will extend the life of all of your appl...