Our superior method of manufacturing are why so many customers prefer our units over our competitor's units. Our method means lower cost to the customer both initially and over a long term. HYBRID units have a rectifier built in for running avionics and air conditioning on the ground, but are also augmented with batteries for starts. These batteries provide a "SAFETY NET" to the user should the engine inadvertantly be turned off or run out of fuel. This type of unit will continue providing cranking power without even the engine running, unlike other units such as HOBART Jet-X series that produce absolutely NO POWER when the engine is not running. That NO POWER syndrome without the GPU engine running can cause an expensive hot start if it occurs during the start.