Grecell T-500 powering a diesel heater with a booster pack. Booster pack only needs to be used on start-up and powering down the diesel heater, as it uses a lot more power which the Grecell T-500 will not accommodate. if you try just using the Grecell T-500, it will keep on shutting down the diesel heater with an error code. So far the GRE cell T-500 is a game changer, which I highly recommend getting one. I bought mine on Amazon.