Absolutely ideal would be 2 stage
9 volts for 1 second (for guys with weak battery's/ hungry starters) and 11 or so for normal so you don't drain the battery sitting in the parking lot.
I realize that would be hard, but it would be ideal.
2002 Golf TDI With Phatbox . Blue 87 Supra Needs to go, Grey 89 Targa with stock Radio.