The SOLARGUARD 150 energizer powers up to 40 acres or 12 miles of fence. It has 0.15 Joules of output energy (0.21 Joules of stored energy). The solar panel and battery are integrated into one convenient robust case that is easy to carry and is able to be mounted to existing steel or wood posts. Users are able to fit and replace the battery without having to remove from the mounting post. This energizer is more powerful than comparably sized energizers and includes leads for connecting to the existing fence.