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Old 11-02-2015, 08:44 PM   #29
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Do you have the BlueSky IPN remote? With it you can change the voltage thresholds and disable the equalization cycle. The battery monitor is also good value!

Your Powermax Boondocker doesn't look incompatible with lithium batteries. Sure it would be nice to adjust some of the thresholds but the max voltage is 14.6 V, less than the max allowed by the bms system 15.1V. Preferably you would disconnect the converter from the batteries when connected to shore power anyway.
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Old 11-03-2015, 05:39 PM   #30
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Quote:
Originally Posted by BoldAdventure View Post
As I understand it, lithium has a different charging profile than AGM and Lead Acid. My Powermax Boondocker is a 60 amp 4 stage converter.

The solar unit I have is a Bluesky 2512iX MPPT Charge Controller.

Your Blue Sky controller is easily programmed to meet the charging needs of lithiums. In fact, you would have to revert back to your old Parallax, as the constant 13.6VDC output is better for lithiums than a multi-stage converter, which won't work with lithiums.

The best on-grid charger is the Magnum MS-2012, but lithiums will tolerate the Parallax, leaving the bulk of the charging (pun intended) to the Blue Sky.

Remember that lithiums don't need to see 100% state of charge to operate effectively. They are quite comfortable at charge states below full. The only down side is less available amp/hours at a lower SOC.


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Old 11-12-2015, 11:00 AM   #31
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Have been doing some back and forth and made our final decision after chatting with Lew and Marvin and discussing some options with the wife. We're going with GBC/Elite lithium batteries.

And I guess I'm going to just be doing a do-over on a few components. Scheduled install is after Thanksgiving, and I'll start a new thread then.
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Old 11-12-2015, 03:32 PM   #32
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Old 11-20-2015, 01:47 PM   #33
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Bold,

You could DIY a lithium LiFePO4 300 AH solution for less than $2000. You can find 3.2 V, 300 AH prismatic cells for about $400. Combine that with (4) BMS cell modules from EV Power, Australia (about $19AUS each) and add a BMS control unit from the same company with a disconnect switch for $175AUS, add a fuse and your there.

Not sure why your converter isn't compatible. Is it a single-stage supply? It shouldn't overcharge the cell. When you're connected to shore power you can also disconnect the cell and let your solar charge the lithium. And what's your solar charger brand? If you can change the voltage thresholds you might be able to make it work.

The reason lithium might make sense for you is that you're willing to put the battery pack inside the AS. LiFePO4 cells don't like freezing and they degrade with high temperatures so they're not a good option if you're trying to put them in the outside box.
You and another friend, I tell ya. Got the gears spinning.

I did some research to discover the source of AMSolars cells. PS, they come from China, and are made by Sinopoly.

You're right, and I've been reading EV forums, talking to some folks on Slack in an EV discussion group and watching tons of youtube videos.

I haven't put together a fun project in awhile, but I am thinking of getting cells and building a big battery bank myself.

The EV community has put together a lot of information and I'm surprised there is almost zilch in the RV community. I have found a lot of good info on one of the prepper forums for off grid living on building huge LiFePo4 banks for solar.

Lots of ideas. But when I started pricing components. Yeah, I want to try this.

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Old 11-20-2015, 02:22 PM   #34
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Bold, as a EE, I worked on a couple of custom lithium battery developments using another chemistry and I'd be happy to be a sounding board and help look into the necessary components. Send me an email directly.
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Old 11-20-2015, 03:14 PM   #35
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I've got a related question I thought I would post here. I converted my two 12v flooded batteries over a year ago with two 6V Interstates (232 Ah). I modified the battery box to accommodate them, and I'm running two 125 watt solar panels which I'm very happy with.

I usually run an hour or two of TV, occasional furnace and fans. Also, Cpap machine all night. When batteries were new, by morning they still had more than 50% remaining capacity. In less than a year one of the Interstates went bad and was replaced. All was good for a few months. Now, I'm down to 75% shortly after the sun goes down while only running lights, which are LEDs. I'm suspecting the other Interstate battery is bad.

I'm thinking of switching to Trojan T-105s. Do you feel they are much better than interstates? The other option would be to install two more 6Vs to provide me additional capacity, but concerned about extra weight. Based on my usage, am I asking too much using two 6Vs only? Would switching to Trojans meet my needs, or should I consider four 6 volts?


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Old 11-24-2015, 10:01 AM   #36
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I replace more Interstate batteries due to premature failure than any other brand. That says something about the lack of longevity due to poor quality.

I think that Trojans are the best for liquid cells, but I install only Lifeline AGMs and now the new lithiums from AM Solar.


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Old 11-24-2015, 10:17 AM   #37
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I replace more Interstate batteries due to premature failure than any other brand. That says something about the lack of longevity due to poor quality.

I think that Trojans are the best for liquid cells, but I install only Lifeline AGMs and now the new lithiums from AM Solar.
My Interstates were purchased back in March, and they deplete fast. Part of the reason for all this planning.

I can't find a US distributor for the Sinopoly cells AMSolar is using, but I have found distributors for the GBS and Winston cells. I'm thinking of working with 200ah 3.7v cells instead of using 100ah cells to save on space.

Going to talk to Starlight Solar later today or tomorrow if I don't get to it to see it they'll sell the cells seperately.
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Old 11-25-2015, 03:50 PM   #38
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Just acquired today. Like I said, could not get the cells AM Solar is using without waiting 3-4 weeks on shipment from UK or China. Winston cells are a bit more. GBS is reasonably priced in comparison. And I could pick them up at a US retailer here in Yuma. So, since I'm full time these are the cells I'm going to use.



I'll start a new thread shortly. We are going to figure out where to place these and build a battery box inside the Airstream, and I still have a few more pieces of the puzzle.
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Old 11-25-2015, 06:04 PM   #39
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Our 300 amp-hour AM Solar lithium battery was configured to be 11.25" x 14.5" and weighed 84 pounds. That is less weight than the two Interstate stock batteries that were removed from the battery box (which became storage for blocks for the stabilizers). We put it just in front of the street side wheel well and it fitted under the sofa with pull out mattress shelf.

Another configuration would be 5 ⅝" x 29". The third configuration is 7.25" x 22.5". One can safely use about 250 amp-hours out o0f the 300 amp-hour battery.
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Old 11-25-2015, 06:26 PM   #40
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Holy crap that an impressive set of batteries. I want them, but I would know what to do with them.
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Old 11-25-2015, 08:40 PM   #41
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Our 300 amp-hour AM Solar lithium battery was configured to be 11.25" x 14.5" and weighed 84 pounds. That is less weight than the two Interstate stock batteries that were removed from the battery box (which became storage for blocks for the stabilizers). We put it just in front of the street side wheel well and it fitted under the sofa with pull out mattress shelf.

Another configuration would be 5 ⅝" x 29". The third configuration is 7.25" x 22.5". One can safely use about 250 amp-hours out o0f the 300 amp-hour battery.
This will be 400aH.

GBS (Purple)
Winston (Yellow)
Sinopoly (AM Solar - Black)
Foxell (Blue)





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Old 12-13-2015, 10:16 PM   #42
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So this project is mostly done. Just a few last pieces and some cable labeling and organizing. But we are running on Lithiums!



What a mess.



Said goodbye to these old boys today. Took them to Autozone for $10 store gift card to be recycled.
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