At startup, the current sunk by the EarthX battery will be significantly higher than the PC680, but for a shorter period of time. This isn't a problem per se, unless the alternator isn't set up to handle it. An EarthX ETX 680 will sink +60A right after starting, a ETX900 will sink +80A, and so on. You want to size the alternator to be larger (capacity) than the battery, not the other way 'round.
The Yellow -vs- Green indication is a matter of where the set points are for the gauges in the Dynon or Garmin software. What you should be looking at is absolute ##'s. (Volts 13.2 - 14.7 -- OK)
Is a .4V difference in the ships running voltage going to blow a fuse? Possibly -- higher voltage (the push) means more current (the flow), more flow generates more heat (the resistance) in the fuse so it could blow...certainly.
Retired Firmware Guy and Airplane Builder
2020 RV-14 QB -- Under construction - Tailcone & Empennage Complete.
2018 RV-7 QB -- Built, Flying
2007 RV-7 QB -- Built, Drowned, Resurrected and flying
1998 RV-8 QB -- Started, Sold
1986 Mooney 205SE
1980 Mooney 231
Aided and abetted building a number of other RV's.
Last edited by bjdecker : 06-01-2021 at 08:08 AM.