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Old 05-24-2015, 12:33 PM   #29
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Originally Posted by kry226 View Post
How do you do this? Just cut the line (where?), or possibly install an inline switch?

Don't think I'd ever want a permanent disconnection as there's always a chance one may need some charging from the TV.

ETA: Or is this only with a solar installation?

2 ways. The easiest is to just remove the fuse in the TV for the charge line. The second is as Switz described above. #2 is a bit more involved, but great if you tow other trailers that need the charge line to be active.



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Old 05-24-2015, 12:53 PM   #30
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Thanks for the info, gents. Much obliged.

But again, we're only doing this when solar is installed, yes? Otherwise there seems to be little chance of overcharging with only the TV power.
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Old 05-24-2015, 02:12 PM   #31
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Nope,

If you install Lifeline AGM batteries, the TV charge line needs to be disabled. I can't address other AGMs or liquid cells as I don't install them. Same with lithiums, but they need more sophisticated charging and would gave solar and inverter/chargers anyway.


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Old 05-29-2015, 07:47 AM   #32
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Lithium Iron Phosphate Batteries

On the smart website I see a five year warranty and around $1200 for a battery. I pay $200 for two- two year Johnson controls 184 amp hour batts (total) that last usually around 3 years. Not counting having to change out chargers and controllers and adding monitors that same money provides 12 years of full replacement, 92 amp (50%) and 18 years of personally realized life each 2-3 years starting fresh with lead acid. I like AGM too but cost/life difference is important.
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Old 06-04-2015, 06:12 PM   #33
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One lithium fact that AM Solar shared with me was the long range cost of lithium battery replacement. Good news, a replacement cell is only $175 dollars, bearing in mind that it has to be brought into balance with the remaining cells before installation. That changes the long run cost considerably for the better.
Now, if you are younger than me, lifetime lithium costs in addition to future price reductions could make them the cheapest of all types of batteries. It may become more practical to keep your batteries when you trade or sell your Airstream. Also, future batteries may be made of aluminum and/or other material. Aluminum is being tested as I write. There will be all kinds of future cost reductions. Think ball point pens again.
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Lew, thanks for all your info on this subject. I can't think of a more exiting project as upgrading our Airstreams to your standards.
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Old 06-04-2015, 09:21 PM   #34
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Replacing a single cell is an interesting topic. Would like to see some more data on doing that in the configurations that we use. Besides the balance of voltage there are likely other factors that would affect how well it would play with the other older cells. Discharge rates, internal resistance, whether you are monitoring each pack with its own BMS (Battery Management Sensor) or monitoring a pack of cells with a single sensor to name a few.

Still lots to learn about these. So far I really like the setup that Marvin Braun from PrecisionRV did in my 2015 Classic. With full sun it looks like I can run the AC for about 4 hours if required solely from the lithiums (400ah). Throw a single Honda 2000 into the mix and it would nearly double the time.
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Old 06-05-2015, 09:45 AM   #35
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Lithium batts

I brought up lithiums a while back and was blasted now it is a topic growing much more popular funny how things change here. Rand
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Old 06-05-2015, 03:45 PM   #36
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You were just ahead if your time!!!


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Old 06-05-2015, 08:38 PM   #37
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One concern I have with the Lithium Ion is thermal runaway. The Boeing 787-8 initial woes come to mind as a big example.

I have been reading about Aluminum Ion which has similar and possibly superior capabilities to the Lithium, but is not yet commercially viable.
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Old 06-05-2015, 10:00 PM   #38
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Lithium ion commonly refers to the formulation using cobalt. They did have thermal and other incendiary problems and gave lithiums in general a bad name. This is why we can't shop the (yet).

The formulation we use is lithium iron phosphate (LiFePO4). They are referred to as lithium phosphate batteries, or dimply 'LiPo'. Different chemistry and different characteristics.


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Old 06-06-2015, 07:03 AM   #39
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Thanks, Lew. That definitely makes a huge difference and raises the confidence factor.
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Old 06-06-2015, 09:59 AM   #40
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[QUOTE=lewster;1632963]Lithium ion commonly refers to the formulation using cobalt. They did have thermal and other incendiary problems and gave lithiums in general a bad name. This is why we can't shop the (yet).

The formulation we use is lithium iron phosphate (LiFePO4). They are referred to as lithium phosphate batteries, or dimply 'LiPo'. Different chemistry and different characteristics.



Sorry about the spelling! The phone likes to do it's own thing sometimes and if I don't proof read the message, this is what you get!! The message should have read:

Lithium ion commonly refers to the formulation using cobalt. They did have thermal and other incendiary problems and gave lithiums in general a bad name. This is why we can't ship them (yet).

The formulation we use is lithium iron phosphate (LiFePO4). They are referred to as lithium phosphate batteries, or simply 'LiPo'. Different chemistry and different characteristics.

Hope it makes more sense now!
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