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01-23-2022, 04:31 PM
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#1
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Member
Join Date: Aug 2014
Location: Orlando, FL
Posts: 12
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Lithium powerwall upgrade
I have recently given my TM a major upgrade. It was a project born of Covid lock-in boredom, and overkill for a rig of this nature, but I share it with you today.
I have installed a 15kWh Lifepo4 battery bank with a 3kw Victron Multiplus battery inverter. In practical terms, I can run my entire rig, including AC, for 15-20 hours with no electrical hook up, or generator running.
I may post pictures or answer questions about it here if anyone is interested.
Happy trails.
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01-23-2022, 06:38 PM
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#2
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Site Team
Join Date: Feb 2003
Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,123
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Wow! What a beast! That bad boy must weigh 350-400 pounds. And I won't inquire as to the price. That will be a great setup for disaster preparedness, like a hurricane in Florida.
Bill
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01-23-2022, 07:28 PM
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#3
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Site Sponsor
Join Date: Mar 2013
Posts: 1,056
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Yes, picture's would be great. I have a dinky solar system compared to yers.
__________________
2013 2619
80 watt solar panel/swing hitch/low profile A/C.
Enduro 4445 caravan mover
2016 Dodge Ram 1500 V8 Hemi
Installed powered folding tow mirrors
Stopped playing with airplanes, now I just enjoy watching them fly by.
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01-23-2022, 08:02 PM
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#4
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Site Sponsor
Join Date: Jul 2006
Location: Sunny Beaches of Los Angeles
Posts: 3,259
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Wow!!! Yes, more details and photos please! Would love to see this.
Dave
__________________
2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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01-27-2022, 06:20 AM
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#5
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yes, they hunt lions.
Join Date: Aug 2005
Location: Reno, NV
Posts: 1,324
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Less weight than you were thinking.
Quote:
Originally Posted by Bill
Wow! What a beast! That bad boy must weigh 350-400 pounds. And I won't inquire as to the price. That will be a great setup for disaster preparedness, like a hurricane in Florida.
Bill
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The battery cells are about 16 lbs each. 16 of them makes about 260 pounds, and the Victron unit isn't terribly heavy. Although picture #2 doesn't show all of the cells, I'm assuming them to be 1P16S (One battery pack of 16 cells in series). This looks great - although, to add additional lifespan for the cells, I would have compressed them. OTOH, a compression structure would add more weight and much more cost.
The welded-on battery cell terminals are very interesting - and probably more convenient than screw-in studs. (With screw in studs, you must be VERY careful to apply the right amount of torque.) This is beautifully done!
__________________
TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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01-27-2022, 07:08 AM
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#6
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Member
Join Date: Nov 2021
Posts: 39
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Quote:
Originally Posted by rickst29
The battery cells are about 16 lbs each. 16 of them makes about 260 pounds, and the Victron unit isn't terribly heavy. Although picture #2 doesn't show all of the cells, I'm assuming them to be 1P16S (One battery pack of 16 cells in series). This looks great - although, to add additional lifespan for the cells, I would have compressed them. OTOH, a compression structure would add more weight and much more cost.
The welded-on battery cell terminals are very interesting - and probably more convenient than screw-in studs. (With screw in studs, you must be VERY careful to apply the right amount of torque.) This is beautifully done!
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What do you mean you say 'compression structure'?
__________________
2006 2720SL
NovaKool 4500 fridge*
Interior Automatic switch on waterheater*
SoftStart AC*
Futon Style Couch*
*All done by previous owners
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01-27-2022, 07:41 AM
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#7
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yes, they hunt lions.
Join Date: Aug 2005
Location: Reno, NV
Posts: 1,324
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LFP Battery cell compression.
The formal testing was done by EVE on their own cells, but the results are widely agreed to be applicable to any other thin-wall rectangular cells. Compression keeps the sidewalls from expanding and contracting as much. In the test, compressed cells (around 12-14 PSI) had DOUBLE the lifespan of the uncompressed cell in the test - all subjected to the same "charge/discharge/recharge/repeat" regimen. IIRC, it was roughly 5000 cycles versus about 2500. They discharged them pretty deep.
Here's a pretty good photo of the concept, in which I used 4 compression springs to push steel plates into the large "faces" of some LFP cells. The small sides , and the top/bottom, do not need to be compressed separately to achieve the benefit (and the EVE test pressed only along the "big" faces of the cells.) Although I have used steel plates on my two "smaller" batteries, most people use 3/4" plywood. Cheaper and easier to work with.
For a plywood example, see https://diysolarforum.com/threads/pr...98/post-430244
One of my own battery packs (before adding a heater pad and wood "casing") is show in the attached photo.
__________________
TM='06 2619 w/5K axle, 15" Maxxis "E" tires. Plumbing protector. 630 watts solar. 450AH LiFePO4 batteries, 3500 watt inverter. CR-1110 E-F/S fridge (compressor).
TV = 2007 4runner sport, with a 36 volt "power boost".
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01-27-2022, 12:10 PM
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#8
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Site Team
Join Date: Feb 2003
Location: The mountains of Scottsdale, AZ, and the beaches of Maine
Posts: 10,123
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Quote:
Originally Posted by Bill
Wow! What a beast! That bad boy must weigh 350-400 pounds.
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Joey -
I think you have a 2011 2720QB, which came from the factory with 14" ST (Special Trailer) tires rated Load Range C. Have you had a chance to upgrade to Load Range D (either 14" or 15")? The original LR-C tires did not have a lot of load-bearing margin, and much as I love this project, its weight, including the panels "upstairs", eats up quite a bit of it.
Just a thought ...
Bill
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01-27-2022, 12:18 PM
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#9
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Site Sponsor
Join Date: Jul 2006
Location: Sunny Beaches of Los Angeles
Posts: 3,259
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Quote:
Originally Posted by Bill
The original LR-C tires did not have a lot of load-bearing margin, and much as I love this project, its weight, including the panels "upstairs", eats up quite a bit of it.
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That's putting it politely. The LRC tires are simply insufficient. That may be within specs on paper, but in practice, have lead to many blowouts reported on this forum. I had several alone. I'd consider moving to LRD the bare minimum, but with all the extra weight you've added, I'd consider LRE a requirement.
Good catch, Bill.
Dave
__________________
2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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01-27-2022, 12:22 PM
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#10
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Member
Join Date: Aug 2014
Location: Orlando, FL
Posts: 12
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I believe I have 15" wheels with recently replaced 10 ply tires. I added the system in and removed all the existing cargo, which had to weight about the same. I don't have much issue towing it, but I recently got a weight distribution hitch, which I can't wait to try out.
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