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Old 03-29-2016, 02:00 AM   #631
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Windows are aluminum framed, I bought a bunch of surplus ones off eBay. I've never seen steel framed windows.

You're right, stainless mixed with mild steel would be less reactive than stainless in contact with aluminum but sometimes there's no choice. Next best is to mitigate factors as much as possible, hence the coatings and sealants. Using the butyl tape will cause much less problems than if the aluminum was in direct contact with the steel skin.

I picked up a box of 500 stainless 3/8 rivets with a 1/4-3/8 grip for about 100 bucks from Tacoma Screw in the Seattle area. I'll be using the same rivets to assemble the interior furnished wall panels to the steel framework, and probably most of the cabinetry panels.

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Originally Posted by Docsgsxr View Post
Are your windows aluminum or steel? Would the SS rivets react with those if they were steel? as far as coating them on the inside, wouldn't he butyl tape seal the point in between panel and window and rivet?

Picked up 2 of the heat knives. HF had them on sale for ITC members for 14.99!

BTW, where did you get your rivets and what was the cost?
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Old 03-29-2016, 02:01 AM   #632
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suddenly, a wild shower stall appeared!

Suddenly, a wild shower stall has appeared!
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Old 04-02-2016, 11:14 PM   #633
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Doesn't look like much but that's a 4.5 inch hole all the way into the basement compartment. Locating that is a big deal because plumbing.

Anyway, framing up a slim steel support box for shower stall, that will dictate kitchen cabinets, etc.

I also pulled the entire frame cover panel in the underbay, there is as much room in there as I had hoped. There was a lot of dirt too.

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Old 04-04-2016, 12:01 PM   #634
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Lithium Batteries - Prismatic LiFePO4

Has anyone had direct (current) (ok yeah terrible joke) experience with lithium battery packs in RV applications? There's a few folks out there like the technomadia folks who have some compelling reasons to spend the money upfront for this.

Between the desiccating dry poop box instead of black tanks, lithium battery systems, direct current 48vdc aircon, and kilowatt solar panel systems, I'm drawing some conclusions that I am swimming FAR outside "normal" RV systems territory.

Just curious to see what folks think about the lithium batteries.

From what I gather:

Not so great:
  • Currently (Q1 2016) batteries are approximately double the cost for similar AH capacity of lead acid.
  • Additional costs of management for charge and thermal regulation apply.

Pretty great:
  • Tolerant to high charge/discharge rates.
  • Larger thermal operation window
  • No mechanical maintenance
  • Far more discharge/charge cycles, like an order of magnitude more. (like 2000 cycles vs 200 cycles)
  • Higher discharge capacity without damage (80 percent vs. 50 percent)
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Old 04-04-2016, 12:30 PM   #635
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Advantage in weight also.
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Old 04-04-2016, 03:28 PM   #636
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temperature seems like the big disadvantage.. I owned a Chevy volt for 2 years.. and more than once the car got so hot that it activated its own Air-conditioner coolant circuit to cool down the batteries.. if charging it also greatly slowed my charging process.. if you are charging via solar efficiently you are likely also in an area that may be warm.. so thermal management is a biggie.. my car also wouldnt run on its batteries if they were below -15f, the car physically wouldnt work until its gas engine warmed up the pack enough to drive....

-Christopher
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Old 04-04-2016, 07:29 PM   #637
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Cool

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temperature seems like the big disadvantage.. I owned a Chevy volt for 2 years.. and more than once the car got so hot that it activated its own Air-conditioner coolant circuit to cool down the batteries.. if charging it also greatly slowed my charging process.. if you are charging via solar efficiently you are likely also in an area that may be warm.. so thermal management is a biggie.. my car also wouldnt run on its batteries if they were below -15f, the car physically wouldnt work until its gas engine warmed up the pack enough to drive....

-Christopher
I think YOU should think about a TESLA!!
[The Tesla 3 just fresh out on the market is prized to sell!]


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Old 04-04-2016, 10:52 PM   #638
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Have you seen the youtube video of people using ecar battery packs for their solar system batteries?
Apparently they tried to make hybrid buses for a while. I'd like to have some of those battery packs.
The Tesla bus. That's what I think of when I look at the warthog photo.
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Old 04-04-2016, 11:09 PM   #639
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some of our city busses are still hybrids.. I dont know who makes those coaches... they have huge batteries on the toprail of the bus.. (same place as the CNG tanks are in the CNG models)...

an E-car battery pack gives you a decent amoutn of power storage (as long as you manage it well)... lithium batteries dont like being fully charged or fully discharged... you would have to put a strict charge management system on to get longevity.. in my chevy volt it had a 16.1 kwh pack.. but they only gave you access to 10.5 kwh... as they only discharged it to 20-25% and charged it up to 80-85% .. theoretically a pack managed in that range can last through 1000s of charge cycles... I can imagine at least 1 or 2 charge cycles per day in an RV environment.. the packs are also heavy.. I have no idea how heavy a converted skoolie is compared to a fully loaded in-service school bus.. but probably there is plenty of extra weight capacity available, so a 1000 lb battery woudnt hurt?

-Christopher
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Old 04-05-2016, 01:48 PM   #640
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I don't think weight will be an issue. I'm contemplating trojan t-105 batteries currently, which are 6 volt batteries. They come as a 225 AH rated battery, and you'd need at least two of them to get to 12 volts. At 62 lbs a piece, they stack up in weight fast.

In order to avoid a more than 50% discharge scenario, I need to "oversize" the battery capacity of lead acid systems, so I'd probably want to acquire 8 of those batteries for a 24 volt pack that is solar optimized, or a 12 volt pack for a plug in recharge optimized system (no solar)

In the end, that amount of lead acid batteries will weigh significantly more than any lithium battery pack of similar physical size.

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Originally Posted by cadillackid View Post
some of our city busses are still hybrids.. I dont know who makes those coaches... they have huge batteries on the toprail of the bus.. (same place as the CNG tanks are in the CNG models)...

an E-car battery pack gives you a decent amoutn of power storage (as long as you manage it well)... lithium batteries dont like being fully charged or fully discharged... you would have to put a strict charge management system on to get longevity.. in my chevy volt it had a 16.1 kwh pack.. but they only gave you access to 10.5 kwh... as they only discharged it to 20-25% and charged it up to 80-85% .. theoretically a pack managed in that range can last through 1000s of charge cycles... I can imagine at least 1 or 2 charge cycles per day in an RV environment.. the packs are also heavy.. I have no idea how heavy a converted skoolie is compared to a fully loaded in-service school bus.. but probably there is plenty of extra weight capacity available, so a 1000 lb battery woudnt hurt?

-Christopher
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