I've reviewed the prevous very helpful diagrams of the earlier 320's. I'm now about to install a second Victron MTTP controller for remote panels and move my smartshunt from tub to under the bench. In reviewing the current wiring all is in place to:
1- A minor wiring change for the installation of a Zamp connector in front of the driver side wheel. I will connect it to the existing MTTP controller in parallel with the existing battery wires. All remote wiring will have MC4 connectors for weather resistance. I'm concerned that a label should be added to the side of the trailer indicating the input is to be used ONLY with panels without a controller (though this may be overkill) as a controlled solar input will NOT allow the panels to charge the battery. A bypass switch would NOT be a safe idea.
BUT I noticed that the factory installed controller has a 30 amp fuse in line with the solar panel lead. This doesn't make any sense as the panels CANNOT generate nearly enough current to blow this fuse. I was thinking to add a 15 amp on the output of my new 75/15 controller to protect it in case a wire shorts on the way to the battery's 30 AMP fuse. Though depending on how the controller is powered it may not be needed even here. The same logic holds for the factory installed controller but they put it on the wrong lead. What am I missing?
2 - For the SmartShunt, I'm repurposing the Trailer's white wire from the battery to Controller to be the battery to shunt connection and adding a short wire from the shunt to the controller(s). I'll leave the second white wire at the battery alone as it is for the trailer lights that are powered from the TV. I think the existing white wiring can or with a minor change in the "J Box" be changed to handle the TV's battery charging monitoring separately and go through the shunt.
Other than I'd prefer to mount the remote power input in the front middle of the T@B to optimize locating the remote array, the above uses the existing battery charge wiring without adding to power losses. As a consequence, it eliminates the added bulk in the front tub. NOTE if factory wiring for solar panels is not currently installed my solution may not be as good as putting it in the tub. Also I have no clue how pre-2021 320s were wired.
Also in deference to the experienced users' observations: the twin but hard connected remote panels will have a box to either series or parallel them to study outputs based on existing solar input conditions.
Kindly add concerns on what I may be missing...
Mark (...a bear with very little brain...)
So glad to join the TAB Forum. Have lots of questions, but for now happy to connect. We got our TAB 320 S in May 2020 in St. George, UT. We were taking annual March vacation at Solitude to ski and visit children and grand children. COVID quickly changed our return plans. By May we realized flying and staying in hotels was out of the question. So we sprung for our first ever camper, TAB 320 S. There were none left in Salt Lake City so we traveled to St. George. Immediately joined daughter and family for a weekend of Boondocking in/on Gooseberry Mesa. Quite an adventure. We are hooked. Got back to Vermont for summer. Now need to get back to the mountains. I figured out with help of youtube videos the winterization process, hope I got it right. She is currently nested under trees and a foot of snow. My question which led me to the forum was can we run the Alde heating system without using water heater. Thinking of traveling back to Utah in March, probably too early to fully dewinterize. The Alde site says YES this can be done. Looking for feedback from the forum. Enjoyed a couple of similar posts. Also I need to replace battery. Would like a good, AGM, not Lithium. Look forward to learning a lot from this forum.