I contacted Blue Sea about their Batterylink ACR and west
marine tech support about the Combiner 50 and both said it is no problem having a charging source from both sides of relay. I'm going with the ACR and
wiring a 150 amp thermal breaker as added
safety. They say it is not needed if your wiring is less than 40" (abyc E-11) but this is the breaker they recommend if wiring is more than 40".