I recommend starting with .5 amps on the JP electric retracts, I had to bump up the mains to .6 to get them to retract consistently. Be very careful if you power this unit via 2SLipo as the JP Retract motors can only handle 7.5 volts, ask me how I know that! With 2SLipo I use a regulator set to 7.5v, another option is 2SLiFe, which does not require a regulator.