pvstoy said:It comes down to what your separator will allow from either direction as you charge. You can test this with your volt meter as you charge the camper batteries and check the truck battery voltage before and during charge to see if the separator opens up. Then check it the other way with a charge to the truck batteries.
rando said:As others have said, it all depends on which isolator you have in your camper. FWC has installed several different ones over the years. The newer Blue Seas ones are 'dual sensing' and will connect your camper battery to your truck battery if it detect either are charging. The older isolators (from Surepower) are single side sensing and will only connect the truck and camper batteries if the truck battery is being charged.
The isolators aren't directional - once they are engaged, current can flow either direction. They are just a relay. The IOTA doesn't play a role in this, it is just a charger/power supply.
So which isolator is installed in your camper?
rando said:My 2016 Fleet Flatbed came with the Blue Sea isolator, which IS dual sensing and allows bi-directional charging. You really need to go look in your camper and see which one you have, I would not trust the manual as the FWC documentation seems to be poor and out of date.
If you don't recognize it, post a photo and we can tell you which one it is.
This is the older isolator that will not charge the truck battery from the camper side power whether solar or Iota.Wallowa said:OK...attached is photo of my 2016 Hawk SEPARATOR [Eaton Model 1314A] which allows multiple batteries to be charged from one charging source [product description]....
The second post to follow will show a photo of the ISOLATOR which only allows current to flow from the truck battery to the Hawk when the truck is running and truck alternator is supplying the current..
Both were installed by FWC and it was explained to me [by installer and FWC tech via phone] that the truck can charge the Hawk batteries using the truck alternator but current will not flow back into the Tundra battery from the Hawk batteries or camper charging system...this one way 'isolation' is to prevent the Tundra starting battery from being drained by low Hawk batteries..when the truck is running the truck alternator is the charging source for the truck battery and as needed the Hawk batteries.
Hope the images come through..
Phil
This is the resettable circuit breaker to protect the camper side.Wallowa said:ISOLATOR image
PaulT said:This is the older isolator that will not charge the truck battery from the camper side power whether solar or Iota.
Paul
Sorry, I realize now that that circuit breaker is the one under your hood. There should be a second one like it in the camper near the Surepower 1314 isolator. The circuit breaker serves the same function as a fuse to protect the wiring but automatically resets if the current exceeds (probably) 30 amps. The isolator’s function is to ensure that the camper circuitry does not draw down the truck starter battery when the engine is not running.Wallowa said:OK...as advertised when I bought the Hawk...but how does this square with your #15 post? I am in my normal state of confusion...
Thanks...Phil
PaulT said:Sorry, I realize now that that circuit breaker is the one under your hood. There should be a second one like it in the camper near the Surepower 1314 isolator. The circuit breaker serves the same function as a fuse to protect the wiring but automatically resets if the current exceeds (probably) 30 amps. The isolator’s function is to ensure that the camper circuitry does not draw down the truck starter battery when the engine is not running.
Both are needed. Without the 1314 isolator, the circuit breakers would happily allow your camper appliances to drain the truck battery as long as the current draw was 30 amps or lower. Even with the truck running, the circuit breakers will limit the current flow to 30 amps.
Paul
PaulT said:You are correct about the circuit breaker next to the separator.
I have commonly (and incorrectly) called it an isolator where the industry name is separator. This page describes the differences. The isolator uses semiconductors to perform the function while the separator uses a relay. I had an isolator on my old VW camper that did essentially the same function from my viewpoint and just continued calling it an isolator.
The device you called an isolator is actually an automatically resettable circuit breaker like the one next to your battery separatorr.
Paul