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Old 09-11-2019, 06:33 PM   #1
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Tesla batteries

I am investigating use of Tesla S batteries, mounted under our Navion 24D step where current FLA batteries are mounted, with a 800 W solar upgrade. Anybody done this before? I think I have the interconnecting 24v and 12v systems understood, but Tesla mounting, heating, and BMS details.

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Old 09-11-2019, 07:20 PM   #2
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A Tesla model S battery is about the size of a queen-size mattress 5" thick, and weighs ~500kg-530kg/1,102 lb.-1,168 lb.
Your thinking is laudable, however impractical.

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Old 09-11-2019, 09:48 PM   #3
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I'll bet he's speaking in terms of a portion of the cell bank not the battery bank as a whole unit.
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Old 09-11-2019, 09:53 PM   #4
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Believe you can break it down into 24 volt modules, but then your have to worry about proper 24 v charging, 24 v inverters, bms, cooling, heating,24 dc to 12 v dc converters etc. In the long run, probably cheaper to go with some 12 volt lithium ion batteries. Complete tesla's batteries run about 400 volts. Battle Born 12 volt 100 amp hr batteries will probably fit in the same space you have, might need a 12 volt heating pad if you travel in freezing weather.
Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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Old 09-11-2019, 10:03 PM   #5
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YouTube video RVers “Morton’s on the Move” have done this, but in a 5th Wheel.

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Old 09-11-2019, 10:09 PM   #6
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Originally Posted by creativepart View Post
YouTube video RVers “Morton’s on the Move” have done this, but in a 5th Wheel.

Yes good in a 5th wheel. Might be a tight fit in a Navion.
Foretravel tag axle 40 ft. 500 hp/1550 ft/lbs ism 1455 watts on the roof. 600 a/h's lithium down below.
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Old 09-11-2019, 10:40 PM   #7
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GyroGypsy....I looked around on the internet and it looks like that battery costs about $12,000.

Is that correct?
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Old 09-12-2019, 07:45 AM   #8
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Sorry guys, perhaps I should have been more clear. 1st - I appreciate your effort to keep me from going astray. However I am a degreed electrical engineer (ASU '72), ham radio operator since '64, FAA licensed airframe and powerplant mechanic. I know volts from amps, and computer systems design thrown in for good measure. I have a well equipped home shop.

Yes, I am looking to use two Tesla Model S battery modules, 24V, 233Ah, 5.2kWh. These are 56 lbs each, and 27 x 3 x 12", and are readily found "lightly used" for $1000-$1200 on eBay. 10kWh of BattleBorn or similar 12v, 100Ah commodity batteries would cost about $8K, weigh 240 lbs, and deract from the precious exterior storage compartment.

So the basic difference is about $6K, with a little more effort that I feel comfortable in doing myself. Obviously the additional cost of the additional required 40A 24v-12v converter to run the house DC loads is negligible when viewed in this scheme. There are some other ramifications, like losing "boost" start.

I found another Navion owner on another forum who has completed this conversion and fit the two Tesla batteries "snugly" under his step with a little fabrication. This location is 30 x 8.25 x 13.25" tall, although the cover hole is just 26.75 x 7.5". Complete compartment covering, insulation, and heating is added.

So, just looking for somebody who may have done this before, or have some helpful insights. I previously saw the Morton video, which is an excellent primer, and convinced me this is easy peasey (ha!)

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