| [GMCnet] Inverter and converter....how about both? [message #347597] |
Mon, 09 September 2019 19:17  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Hi John,
Be very careful doing anything with Tesla or any other car batteries! There is a lot of voltage and a lot of amperage there - way, way more than the 12vdc nominal you want for a house bank in your GMC. The battery chemistry is also way wrong and potentially dangerous for use as a house battery bank without all the sophisticated battery management and cooling built into those batteries for use in the Tesla cars. Tesla is now in its third generation battery technology. The cells look a lot alike, but are no where near the same internally from one generation to the next. The original model S battery bank is made up of over 7000 18650 size cells welded into precisely shaped bricks that are connected series/parallel and surrounded by active liquid cooling. The model 3 batteries are made from more than 4000 cells of a different battery chemistry and a different 21700 size cell made by Panasonic that will become the standard for all Tesla offerings from here on. Panasonic uses various blends of cobalt in their cells to get greater energy density but which also involve greater thermal runaway - fire- risks unless managed very actively by both the Tesla battery management systems and their active heating and cooling systems. Yes, for cold weather use the batteries get heated by a form of miniature heat pump designed just for this purpose. For warm weather use the battery cooling fluid is passed through a special part of the AC system output to keep the batteries from over heating.
For use as a house battery bank for your GMC you want ONLY Lithium Iron Phosphate chemistry built to a 12vdc nominal battery by a reputable company with a properly designed, built-in on-board battery management system made for and by the company that built the battery in the first place. Back yard tinkering here can be dangerous to your body parts and loved ones
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
==========Message: 7
Date: Mon, 9 Sep 2019 14:50:15 -0700
From: John Phillips
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Inverter and converter....how about both?
Message-ID:
Content-Type: text/plain; charset="UTF-8"
Vern,
Did you remove your roof AC units?
What kind of racking system did you use?
I would not like to have a panel come off while driving.
I have 8 Solarworld 315 watt 39x78 inches 50 lbs panels I have been
thinking of putting on top of my GMC. It would be nice if I could figure a
way to use some of them as lids for cargo pods.
Reclaimed Tesla car models available on eBay look like a good choice for
batteries. That should be enough to run some AC in the form of a miny split
with soft-start. The panels would have to be mounted high enough to be over
the vents.
I have not figured out where to mount the min split but the efficiency gain
and lowering the roofline rather than having the panels over the AC units
would be worth something. Would this mod make it look too much like a
camper?
I do a lot of dreaming and not much action. I may never do it but I have
been thinking about this for a while now.
John Phillips
75 Avion VIN A26000
Retired
Rancho Cordova, CA 95670
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Jerry & Sharon Work
78 Royale
Kerby, OR
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