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 Topic: Lithium leisure battery in caravan..
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24/10/2020 at 5:19pm
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Lot’s on youtube about the subject and how not to ruin your alternator when charging a LiFeP04 drop in replacement.
You will need to look at the vans charging system, as a different charging profile to that of SLA batteries is required for best results.
Also does your new battery have low temperature cut off, not all LiFeP04 drop in replacements have this feature on the BMS, and without it you must avoid charging when the battery is below 0 Deg C, to prevent permanent damage to the battery, you probably are aware of this already but I thought I would mention it just in case.
Having said that, some LiFeP04 drop in replacements have built in heaters, to allow charging at below 0 Deg C.
Which make LiFeP04 did you go for, or have you gone down the DiY route, the CALB 100Ah cells that come in that grey nylon case look ideal for a DiY build, but by the time you have added in the BMS and other bits, your still looking at £500 or so.
Post last edited on 24/10/2020 17:23:11
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27/10/2020 at 6:33pm
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Yep, trog100 I was looking at the 100Ah battery from SOK battery, which is around the same price as the one you got, the big names like Renogy and RELION are around double the price, although you do get some extra features, with the big names.
U.S. made Battle Born batteries (Dragonfly U.S. branded) are branded as “Transporter Energy” in the U.K. and they are asking £1,200 for a 100Ah battery, which is around £400 more than the exact same U.S. product, no wonder they offering 0% interest on U.K. orders.
I quite like the look of the Renogy battery though as it uses 16 Pouch Cells, instead of 4 Prismatic Cells, although the top brands seem to use 120 Cylindrical cells.
It will be very interesting to see how the LiFeP04 drop in replacement market develops in the next couple of years, and I can see them coming as standard for many caravan and motorhomes, in fact at least one manufacturer already offers them as standard.
Post last edited on 27/10/2020 18:39:17
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28/10/2020 at 5:03pm
Location: Hampshire
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I am certainly glad there are trailblazers out there as technically these things are attractive though IMO need all the twists particular to our the application resolving, or at least refining. On the financial side, they are for us, even though big off EHU campers, still way off the mark. Now we can camp with autonomously with an 85 Watt solar panel and 80/90 Ah GEL battery, through the bulk of the season. So the only gain in our case would be a few kgs weight saving, but having a healthy payload that's in reality of little benefit.
I see the situation for motorhomers as somewhat different, as with their typical mode of operation an ability to take on a thumping fast charge whilst in transit is very beneficial. We caravanners, as standard, never get that fast charge option, as our puny car to van battery wiring simply is not there. Doing so would involve adding at least a stand alone wiring system and ideally using a B2B system.
Anyway, great you are out there sorting out what "works" or not, as come buying a new van it will be useful info to check that the van makers have "correctly" integrated this technology into their builds.
As a stand alone "power pack" I can see that being attractive, in that the van could be fitted with a less weighty LA battery, whilst the power pack could look after our evening's use of the TV and heating system, the real life big drains of energy. The power pack, then either left on site using the solar to top up if still being modestly drained, or put in the car for a trip out getting a high rate charge, so quickly refilled.
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