I done away with the power panel all together and went with a manual pump and a self contained starter, that way I don't need a battery in my flight box and it's a lot lighter to carry. Just the radio,starter, fuel bottle[1 qt-2qt] and hand pump.plus a few tools. Anything else I might need is as close as the car. Over the yeats I built many flight boxes, some carried everything but the kitchen sink and came to the conclusion all that parfineilia was not needed.I could have everything for extensive workover in the car and not have to carry it around.