[mjm6]

Is this empty? I suspect you will gain a little once you have the buildout complete, but be careful of the putting in the Sumo Springs or likewise, as that may raise the rear and front a little, depending on what you put in.

I'll see about measuring the solar and the MaxxFan tomorrow for you.

Here is why I need a low profile solar panel solution.

The carport on my house. About a half inch clearance between the trim board at the edge of the carport and the top of the MaxxFan, when closed, with a full tank of gas.

View attachment 70520

 

[bcblues]

No this is built out. I don't know if it would clear with an empty gas tank.

 

[iamchrisdaniels]

@mjm6 thanks for sharing your build progress and pics. Keep it up! Very inspirational.
Question about the headliner, do you feel like opening that up for insulation and sound deadened was worth it it at this point? I worry about the integrity of the clips being pulled.
thanks!

 

[RV8R]

@mjm6 thanks for sharing your build progress and pics. Keep it up! Very inspirational.
Question about the headliner, do you feel like opening that up for insulation and sound deadened was worth it it at this point? I worry about the integrity of the clips being pulled.
thanks!

We have not done the cab headliner yet. It is a cost/labour vs benefit equation for us.

The cab is loaded with glass. A thermal curtain between cab/cargo area can help when camping.

@GaryBIS has a thermal loss calculator on his website if this interests you.

Windows are the achilles’ heel with heat loss & solar gain for a camper van. Then thermal bridging I think 🤔

 

[mjm6]

No this is built out. I don't know if it would clear with an empty gas tank.

OK, I made a few measurements without getting fully up on the roof as that ladder is put away right now.

I measure my MaxxAir Fan at between 5" and 5-1/2" above the deck of the roof. part of this will depend on where in the van you have your fan installed. I have mine in the flat spot on the front.

I measure my solar panels to be about 3" above the top of the van at the center. They are about 1-1/2" above the van and they are made with 15-series 8020, so they are 1-1/2" thick. For a total of 3" to 3-1/2" at the worst if I measured poorly.

Definitely lower profile than the fan, but if you have the fan at the front and the panels at the rear, they may be getting close because of the way the vans "kneel" a little to the front. When loaded, I think that is mostly gone, though, as the van sits down on the springs in the rear more as it load up.

Here are a few photos of the mounting bracket. It is basically the same for all four, and this arrangement will work perfectly only if you have panels that are wide enough for you to reach in the same way as I have done it. If they are narrower by a bit, you may need to put a spacer in the middle to get the full assembly out the have it reach the mount points.

The Z-bracket is made by cutting two pieces of 2" x 0.1875" channel aluminum to length, drilling the holes in them, and then epoxying them together and placing a SS 5/16" bolt and washer with a Nylock nut and a washer on the inside. I made some calculations to get everything to fit, and it actually went together pretty close to perfectly.

In the top photo, the piece of aluminum and Nylock nut you see to the left is there to secure the 8020 frame to the solar panel. There's a handful of little aluminum pieces I made from strap material (1" x 0.1875" thick x about 3" long) to fasten to the 8020 channels and then to the solar panel mounting holes.

I think I did four on the outsides, one on the front and back on each panel, and then in the front and rear center corners, I added two additional connection points in the plate of aluminum that the solar panels sit on (since there is no 8020 frame between the two solar panels, they are butted together). You can see that plate of aluminum in the last photo. I made it oversized for two reasons... I wanted to strengthen the 8020 at the center because that is where the moment is at its greatest and so if the 8020 were to show a failure, it would flex and buckle in the middle. That is never going to happen, but this piece on the front and back completely ensures that won't happen. Plus, it works as a support point for the solar panels (as does the corner fasteners for the 8020 that you can see in the second photo). Overall, the thing is rock solid.

The 8020 for the sides and back is the 15 Series square with one smooth side, 1503-LS. The front piece is the quarter-round 15 Series 1517-LS. I figure it will be a little more aerodynamic. I got channel that only has a single smooth side thinking that if I ever wanted to put a connection point on the top, it would be possible to do that if I have a slot.

One thing to note. It probably weighs 125 or so pounds, so you either will need some help to get it up on the roof or you will need to di final assembly on the roof on a moving blanket.

 

[mjm6]

@mjm6 thanks for sharing your build progress and pics. Keep it up! Very inspirational.
Question about the headliner, do you feel like opening that up for insulation and sound deadened was worth it it at this point? I worry about the integrity of the clips being pulled.
thanks!

Thanks... I appreciate the feedback.

The headliner is pretty easy to get out, actually. It was a bit of work to do, but I wanted to put wiring in it for the rearview mirror camera, so I was going to pull it out anyway, and while I did it, I added Killmat and some insulation to the area mostly to deaden road noise as that has pretty high speed wind hitting it and zooming over/around the front of the van.

I looked at the clips carefully. If you get the upholstery tools in on the clip and pull it up a little, you can see the orientation of the split in the clips, If you can see that, you can get a CLEAN needlenose pliers on the clip mechanism to squeeze the clip pieces together and they come out pretty easily and intact. Every single one is/was reusable.

To do this well, you have to take the lower headliner (the cab headliner) out and also take out the upper headliner (in the shelf area). If all you are concerned about is some insulation, you could probably forego the lower one. That one really requires two people to remove. I pulled it to run the wires and it all went pretty smoothly actually. I found a video on YT for the lower headliner. Pulling the lower one made getting the insulation all the way down the front easy to accomplish. The upper one didn't take much to get out at all.

I think this was it... fast forward until you see him start on the lower one. I didn't use the goofy tool he has, just the upholstery pry tool and a pair of needlenose pliers.

I still haven't put all the clips back in the upper headliner because I think I may pull it to integrate it with the ceiling as I finish the build. I'm not sure how many In-Out-In-Out-In actions the clips will survive, but they certainly did OK for two cycles.

Overall, I'd say it was worth it to do for the sake of completeness, but it isn't going to have much difference in the total heating load in the van in the winter. It may make an appreciable difference in cooling load in the summer though, since it is where the sun will beat down the worst, and if you have solar on the van, may be some of the few square footage that is in direct sun.

 

[mjm6]

Oh, there's one difference between the video and mine... My PM has the handles on the A Pillars to get into the van. So, to loosen the A Pillar covers to free the headliner, you just pop off the covers on the handles, unscrew the handle, and the A Pillar will be loose and you can pull it back at the top easily.

 

[bcblues]

Thanks for the details on the solar install. Definitely seems like it would fit my need. I will certainly consider this when I add my own solar. I will undoubtedly have more questions then. Thanks again. Looks like a clean, solid system.

 

[mjm6]

New update... I finished the physical install of the Thule Powerstep 550. It went in pretty easily overall with just minor modifications made to the install from the instructions.

I'm guessing that the muffler and exhaust is different in the Euro versions of this van since the one exhaust pipe mount interferes with mounting the hanger bar in the manner that they show in the manual. It only takes a simple adjustment to get it to work, but none of that is shown in the manual. Pretty simple to accomplish.

I'll also need to get a little heat shield material for where the exhaust line is close to the step. I bent the factory heat shield to help, but I think a little more would be helpful.

I put it to the right side of the door because there will be a seat on the left side. It is centered in the opening between the seat and the right door frame.

I tested it with my house battery and it functions, but it appears the frame catches on one of the step screws a little on the bottom. I'm going to have to determine if it is tweaked a little (the frame) or something else, and whether I should try to bend it back into position or take a file to allow the screw head to clear the metal frame. It's a bit of a hassle... it doesn't appear to be damaged, but clearly, there is a clearance issue. I can see it catching as the step moves in/out (when looking at the bottom of the step).

No matter, it's in and functional but I won't use it until I get the electrical in place. I still need to decide where I will be placing some of the items (control computer and the override switch). Once that is decided, I can finish the electronics for this.

Overall, I'm pretty happy with how it looks, but I'm debating taking the aluminum and painting it matte black. Almost everything on the van sides is black.

 

[mjm6]

I finished the floor install this weekend...

It was a long, arduous process. First, I had to secure the flooring I wanted (hexabirch plywood). Almost nobody stocks that in CA, but I found an RV upfitter in Salt Lake City that had sheets of 1/2" 4x8 sheets. I coincidentally was going to be going through SLC last fall so I arranged to stop there and pick up three sheets. Wonderful people and it worked out great.

Check out the shop if you are in the area or looking for parts for builds, they have been increasing their web presence a bit:

NaPly Riga Heksa plywood for Camper Construction | Reparadise

NaPly Riga Heksa is ideal for camper and Sprinter construction. Order this weatherproof, non-slip plywood from one of the USA's only licensed distributors.

reparadise.co

They also stock some Dometic products and other things. I ended up buying a handful of items from them, including a pair of Lion batteries, a sink, faucet, drain, the plywood... it was a pretty big haul. Wonderful people, and they are making some impressive conversions, too!

This is what the hexa birch looks like. The scale is relatively small, about 3/8" across the hexagon, and I think it will be quite sturdy and non-slip with wet shoes. The tape in the photo below is 3/4" painter's tape (three pieces slightly overlapped) that I'm using to mark the future wall members.

My flooring cross section is as follows:

3/8" closed cell foam in the valleys.
1" XPS on top of that flus to the ridges.
1/4" birch plywood subfloor, glued to the XPS and the wood underneath (more on that in a minute).
1/2" hexa birch plywood on top of that, glued to the subfloor.

I staggered the seams of the XPS, the subfloor, and the plywood floor, so there won't be any softness in the plywood floor. I made a 1/4" lap joint in the 1/2" plywood with the router and some 1" strips of the subfloor material. The lap strips were glued in the rabbet in the one side in the shop, and then in the van when the final floor installation occurred, I glued the strips onto the other overlapping rabbet in the abutting piece to make them a complete, contiguous top layer. I used Gorilla glue for those joints because they are wood to wood and this would make them extremely strong. At the same time, the top layer was glued to the subfloor with Locktite PL 3X.

On the edges of the floor and wherever the structure is (the galley and the bed and garage frame), I put in some 2-1/2"x1" pieces of wood instead of the XPS foam. These were glued directly to the van deck using the PL 3X glue. This is so that there is a bearing capability in the floor wherever the points of concentrated pressure will occur (the structure, wherever we will step into the van, at the edges, in the corners, etc. Also, I did this where the tie-down screw holes are so that I could bolt through the floor and have a really solid bearing surface for the bolts.

Here is a photo showing some of the XPS and the wood framing that is under the subfloor. I the photo, you can see the edge of the floor at the sliding door, the reinforcement rectangle for the bench, a block to the right for an L-track point, and a pair of 4" pieces that will be where the heater is mounted. Above that, there is a block with a hole in it located at the van tie down location just in front of the wheel well:

The edge of the flooring is built up with a piece of aluminum angle to clean it all up, and when the floor is done, it will have a piece of aluminum stair edge nosing on the top corner, so it will be nice and clean.

Photo of the wheel well and the tie down bolt. This one will be hidden in the structure of the bench when finished. The heater will be in front of it.

Full van with the galley carcass in the approximate final resting place. One drawer is in the carcass. The remaining are waiting for assembly in the garage.

Before I install the carcass in the van, I'm going on a run to get the birch plywood for the bed and garage area... After that, the galley can go in temporarily and I can start locating all the large electrical items on the passenger side, and get the majority of the electrical run throughout the walls and ceiling.

 

[spyderx]

I like the flooring material. Never seen them before.
How did you join the floor board seems?

 

[mjm6]

I like the flooring material. Never seen them before.
How did you join the floor board seems?

I’ll draw a sketch of the floor cross section tomorrow to show you how the floor is assembled. It will show the floor joints in the top layer.

 

[mjm6]

Here is a pair of quick sketches for the floor cross-section.

The bottom layer is the closed-cell foam from DIYVan. I used 3M-90 contact cement to adhere these to the metal floor. I was a bit conflicted about using this, but I figure it will probably help with road noise and will also provide more support for the next layer (the XPS pink foam).

The second layer is the 1" of XPS insulation board. It is glued to the deck as well, mostly to ensure none of the pieces will squeak. On the edges and wherever there will be a concentrated load (the galley walls, garage walls, ant the doors, at the corners, etc.) there is wood blocking glued down. That is show on the left side of the sketch. I put in two layers of wood; one to fill in the valleys and then a second that is exactly 1" thick so it frames in and is flush with the XPS. All glues in with the Locktite PL-3X adhesive.

The third layer (the sub-floor layer) is a sheet of 1/4" plywood. It is pre-finished on one side and is good quality, multi-layer plywood (not the cheap junk from the home centers). It is glued to the blocking with the PL-3X and to the XPS with the PL-300 adhesive.

The fourth layer is the 1/2" Hexagrid plywood. It is glued to the sub-floor with the same PL-3X. The seams are staggered. This is actually one of the primary reasons a sub-floor is used in wood construction (to provide support at the seams so there aren't soft spots in the floor).

So, I decided that I wanted the seams the never be an issue, so even though I ad a subfloor, I decided that it would be appropriate to use an additional measure to ensure that the seams don't have any inclination to pop or move independently of each other. To do this, I could have used one of two approaches:

1. Use biscuit joints between the pieces of Hexagrid
2. Use a lap joint with another piece of wood between the pieces.

I decided that the biscuit approach may be risky because the 1/2" plywood (even though it is very high quality) might not leave enough material to work well. So, I took a router with a rabbeting bit set to 1/4" depth and 1/2" width and ran it on the bottom of the seams of both pieces. I then took a 1" wide strip of the 1/4" plywood used for the sub-floor and glued it into the bottom rabbet on the first piece. I used Gorilla glue for this, so it is permanent and probably as strong as the original plywood.

Once that first piece was glued down in the van (PL-3X), I put down glue for the second piece (PL-3X) and then put a bead of Gorilla glue on the 1/4" plywood strip and then placed the second piece into place and pulled them tight.

Lots of weight distributed on the full floor and especially on the seams for a few days.

All glued up and shockingly solid.

The actual assembly of the floor went pretty quickly. Just a few days to get it all cut and glued in with a few days between to ensure the glue was set. What took a long time was figuring out exactly where I needed to put in reinforcement for everything (which depends on the galley and other layout items, in addition to the location of the parking heater). That too a long time to think through and re-think, check, re-check, etc. For example, the heater had to move because I decided I didn't have enough room under the van for the piping (a beam interfered). That was a last-minute detail. Similarly, I had to move the location for a few L-track tie-down points because of the van structure as well. If I didn't think it out, then lay it out and measure where everything fit in the van, I wouldn't have spotted the possible conflicts.

I'm an engineer... can you tell? It's a nice challenge to develop these systems. It isn't the cheapest, fastest solution that will work, but the solutions are really going to work well for my intent.

 

[spyderx]

Wow, tons of thinking and planning there, just on the floor!
Very clever solution on the seams.

I used to be an EE way back then...