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Old 03-25-2011, 01:47 PM   #15
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I don't have a lot of trust in what sales people tell me. Probably many more are honest than are not, but it is human to promote your product. I hope the company sticks around and prices come down. By the time you are ready to purchase, I would guess the prices would be substantially lower and the company will have a track record. By that time I will probably have AGM's. Thanks again for researching this.

Lew posted more about AGM's on another thread—it's the last post (#23): http://www.airforums.com/forums/f368...ons-74963.html

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Old 03-30-2011, 12:30 AM   #16
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What about LI

Batteries out of a boneyard prius or other hybrid with a stepdown transformer and cuircuitry to monitor and shut sown if overheated or over charged. This is what I am thinking about.
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Originally Posted by sk8r29 View Post
OK, I came into this discussion looking for answers and everyone has created more questions. Good ones too, so...... I called a very helpful Mr. Phil Silverhorn at Lithionics and got at least some questions answered.

Since I teach machining at a St. Petersburg high school and I was trying to get some answers before I had my next class come in I'm sure I didn't think of everything.

First, with a LI system you wouldn't need to have a bigger battery box and in fact the LI batterys would take up less space but the batteries could be put into a case that would be the size of your existing batteries so that you could use your same hold downs. The LI batteries also wouldn't be in multiples like most of us have now so no series connections between batteries. Lithionics recommends replacing lead acid/AGM batteries at a 2 to 1 ratio, meaning if you have a 100 amp hour system you would replace it with a 50 ah LI battery.

Now to the cost. If you had a 200 ah system a 100 ah LI battery would cost $1457. That's a lot but looks interesting if you're off the grid a lot. First they recharge quickly, they last a lot longer and they provide very steady power. Mr. Silverhorn told me he had an RV customer install one of their 200 ah LI system and he was so thrilled with it that he had just come back and was having them install another 200 ah's.

Now, last but not least is the safety issue. The exploding cell phone and laptop and fire thing was with lithium polymer batteries. The batteries that Lithionics uses are made with lithium iron phospate which was developed in 1996 at the University of Texas. Their batteries are approved by the FDA for food related uses and for medical uses and have UNDOT approval. According to Mr Silverhorn if you decided to severely overcharge your LI battery at worst it would de-gas and smoke.

Like I said, I'm a school teacher so I'm probably not going to run over to Lithionics and replace my nearly new AGM batteries. It's not in the budget at this time and my wife would probably shoot me if I did, but in the long haul retirement is at most three years away and I definitely want to boondock a lot more so...
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Old 03-30-2011, 01:20 AM   #17
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Batteries out of a boneyard prius or other hybrid with a stepdown transformer and cuircuitry to monitor and shut sown if overheated or over charged. This is what I am thinking about.
Hi, batteries out of hybrid cars are liquid and or fan cooled and controlled by the vehicle's computer. Also most are little batteries made in a series amounting to around 330 volts. I don't think I would want to experiment with any of those.
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Old 03-30-2011, 01:55 AM   #18
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I wonder how many small batteries there are in these modules? Just thinking. I believe the new hybrids have li in them and not the polymer type either. Have to get on the alternative power threads for this one. I know these can kill if not handled properly. Wouldnt it be nice though.
http://www.toyotapriusbattery.com/

http://www.kronospark.com/index.php/...FUhrKgodaXxkzw
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Old 03-30-2011, 02:33 AM   #19
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LI explained
The Lithium-Ion Battery System*-*VARTA Automotive

http://lithiumion-batteries.com/MarineBatteries.aspx

Better than LI
http://www.rvboondockingnews.com/201...batteries.html
http://www.rvboondockingnews.com/201...o-benefit.html
http://en.wikipedia.org/wiki/Nickel-lithium_battery
http://extenv.jpl.nasa.gov/presentat...Fuel_Cells.pdf
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