Cooling a 24V system in over 105* summer temps in 5th wheel

[TJM]

Well, here we go!

I live in southern Idaho. I can say, when it's 105* here, and my fans were on in the Victron mounted area--in a previous Victron build, it simply heat-soaks everything was at 105* EVENTUALLY. So, cooling is relative to input air temps. The best you can hope for is MAYBE 5-7 degrees cooler. But, at some point, the temp drop inside form a working Multi (or two) is near impossible. Everything just became 105* inside (+/- 2*) .......Heat needs cooled by cooled air!

I am in the same process of two Multi's @ 24v, brainstorming what I will do on this build. Maybe 4" duct hole in the floor, below each wall mounted Multi (stainless and wire covered for vermin). Then adding at least one- prob two-high volume high speed fans, to remove the heat (3/4 of way up the forward facing wall, in 5th wheel--behind the tailgate). Thinking the multi's will draw cooler air from the shade under the RV. Shaded air can be 10* cooler than direct sun.

But I'm really thinking getting my cooler air can be got from the cargo area under floor. (this is the adjacent wall the equipment is mounted on...behind it. ) It would pull colder air-conditioned air from cooled coach--via air from gaps under my stairs (leading into cargo area)

This is tough.

Any other ideas?

 

[Zapper77]

Massive heatsinks on the storage bay and a matching heatsink on the exterior bay wall? Bonus if you add Fans?

 

[wme]

Unless you can draw refrigerated air from inside the 5th wheel you will never get below ambient air temp.
Add a Peltier module or 2 to cool, here's something even cooler https://rigidchill.com/micro-dc-aircon/

 

[timselectric]

Unless you can draw refrigerated air from inside the 5th wheel you will never get below ambient air temp.
Add a Peltier module or 2 to cool, here's something even cooler https://rigidchill.com/micro-dc-aircon/

I have one of them, and it works great.

 

[CommandoJoe]

I'm in New Mexico dealing with 100° temps and my equipment is in a metal cabinet outside, so I feel your pain. I have an exhaust fan in the cabinet, but that wasn't enough, if I leave the door open that helps lot, but still not good enough. I got a 4" inline duct fan with ducting that takes a suction at the exhaust of my charge controller (biggest heat generator) and that still isn't enough. Once it hits 65c, my CC throttle back on charge current. I was considering ducting in some air conditioned air to the cabinet, but I think I'll just get a cheap window AC and cut a hole for it.

I think ducting in cool air from the living space is your best bet though.

Unless you can draw refrigerated air from inside the 5th wheel you will never get below ambient air temp.
Add a Peltier module or 2 to cool, here's something even cooler https://rigidchill.com/micro-dc-aircon/

I thought about something like this for my situation, but they seem to be close to or more than $1k... I also considered finding a cheap used vending machine with refrigeration built in and pull it out.

 

[TJM]

I'll look into

Powerful Micro Air Conditioner in a 24v model​

Thank you gents!