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Old 03-09-2016, 09:29 PM   #29
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When we have to replace our group 24 "stock" batteries, we really want to go with Lithium to get way more AH per pound. At the same time, we'll move the batteries off the tongue and bring them inside, probably under the foot of our bed (27FB).

So we're not waiting for prices to go down, as costs (especially labor) will keep going up, just for the right time to tackle the project.
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Old 03-10-2016, 10:23 PM   #30
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What surprises me is how many folks dump big bucks into a trailer, much more than the cost for a decent 12VDC power system and think nothing of it.

The bottom line is if you need an very good 12VDC system then this is the direction to go. If your choice is to travel from hookup to hookup then you already have a good enough 12VDC system.

Calling this switch more complex is misleading because a portion of the change is meant to remedying OEM shortcomings.

I know it was said you cannot charge from the alternator. This is not exactly correct. In the purest sense there are better ways to charge, this is no different for lead acid batteries. Remember lead acid batteries need to be charged to 100% in order to maintain the AH capacity. Alternator charging will fall short of this goal every time. A benefit of the Li-ion batteries is that partial charging is OK.
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Old 03-11-2016, 12:13 AM   #31
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Actually the premise of this post is incorrect.
Lithium Batteries are going to see a major price drop over the next 5 years.

Tesla is building the worlds largest manufacturing plant for consumer grade lithium batteries. These are being designed as multi-purpose for cars, home solar cell backup batteries, and RVs.

Elon Musk is claiming that prices will dramatically drop and make cheap efficient backup systems.

It might be worth waiting after all.
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Old 03-11-2016, 12:56 AM   #32
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Lots of discussion on this thread, but I don't see any dollar figures...

Could those of you who have switched to Lithium battery systems please indicate how much you spent on the conversion?

What is your bottom line? -- That's what will determine whether Lithiums are in my future, or whether our current setup (two Optima Blue Top AGMs) is good enough.
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Old 03-11-2016, 04:32 AM   #33
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Quote:
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Lots of discussion on this thread, but I don't see any dollar figures...

Could those of you who have switched to Lithium battery systems please indicate how much you spent on the conversion?

What is your bottom line? -- That's what will determine whether Lithiums are in my future, or whether our current setup (two Optima Blue Top AGMs) is good enough.
When you look at that pricing be sure to factor in the life expectency. I think if you really use these things the way Bold does you will see the cost is in line with other options. You just need a long time to work through the initial outlay.
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Old 03-11-2016, 10:17 AM   #34
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Your request for pricing is again misleading. From my observations the conversions (and this includes folks going to solar and better lead acid system) includes several improvements that increase the cost.

You could use the quotation for Chevy that says they have obtained a cost of $145/kWhr. Which would be 80 AH of usable power. However, you and I don't receive the volume discount Chevy does.
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Old 03-11-2016, 10:23 AM   #35
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Why waiting 3-5yrs for Lithium prices is wrong

Good point about Elon Musk's lithium battery plans. That will become a lot more interesting when he actually has a plant up and running - hopefully here in the US.

Another form of payback: If you're concerned about your trailer's tongue weight or are seriously committed to boondocking, you may find real value in the significant boost of Amp Hours per pound of battery. (Edit: my point here is that doing this now vs. later can return real and immediate value, and that's worth considering)

Not everyone needs to be concerned about tongue weight of course (e.g. Those with a 3/4 ton TV or especially1-ton TV probably don't need to think much about load capacity.)
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Old 03-11-2016, 10:44 AM   #36
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You will also have spend as much in a solar system to support the lithiums. If you are always camping with hookups then no need for lithiums or solar.

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Old 03-11-2016, 10:48 AM   #37
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sgschwend got it, with lithiums there is more than just buying two batteries and slapping them in. This increases your expendiature. Buy off the self lead acid or AGM and you just slap them in.

Just like solar, there is more to it than the price of a panel.

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You will also have spend as much in a solar system to support the lithiums. If you are always camping with hookups then no need for lithiums or solar.

Kelvin
Not neccessarily - you could just have lithiums and a generator. Since lithiums can handle a bulk charge all the way to 99% if you can throw the power at it, you can charge them really really fast. So you could just get something like a 100amp charger and recharge those bad boys in 20 mins of generator. Take out the generator every couple of days. Boom.
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Old 03-11-2016, 10:49 AM   #38
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The one thing I've not seen discussed much is what difference in camping lifestyle do lithium batteries make over wet cells. From what I can tell is (1) can possibly power the microwave if one also upgrade the inverter to a much larger unit, and (2) might possibly be able to run the AC for short periods, or longer when mated to a single 2000 watt gas generator.

I suppose the other advantage is to last longer between recharges. But with a decent sized solar setup is that really an issue between wet cell and lithium?

As far as weight, from what I've read the weight savings in batteries is often offset by the opportunity to wire in a really heavy high wattage inverter. If I full timed I might see this differently.
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Old 03-11-2016, 10:50 AM   #39
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I stand by my entire orginal point of this thread.

AGM to Lead Acid is Apples to Apples

AGM/Lead to Lithiums is Apples to Oranges.
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Old 03-11-2016, 11:02 AM   #40
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BoldAdventure and Sgschwend (and any others with Lithium batteries), how much did you spend -- grand total?
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Old 03-11-2016, 11:38 AM   #41
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$3789.92 added up - includes wires, lugs, I bought a crimper, some wood and new converter. I had solar already and an inverter. So not included in my price.



PS: Tesla isn't building prismatic battery cells for your RV.

http://www.techinsider.io/facts-abou...actory-2015-11
https://www.teslamotors.com/gigafactory
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Old 03-11-2016, 11:50 AM   #42
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It's awesome that people like you are pushing the state of the art in off grid systems. We all benefit, like F1 racing advances that eventually dribble down to Toyota Corollas.
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