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Old 04-14-2019, 07:40 PM   #21
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Location: Massachusetts
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Regarding LiFePO4 battery storage at full charge, I read in an article somewhere that with this particular chemistry it did not matter whether you stored them at half or full charge, they do not degrade like some of the other lithium ion chemistries when kept at full charge. Unfortunately I can't find the article so can't link it.

My personal experience is much like davydd's, when I tested my Thundersky batteries at about four years old they still had over 110% of the rated capacity. At seven years when I sold it there was no noticeable degradation. I kept those batteries floating at about 3.45V per cell their entire life, the first year they floated at about 3.6V (per Thundersky recommendation)! I am floating my current pack at about 3.4V in the Roadtrek, and I leave it plugged in all the time.

The interesting thing is I'm now replacing the Thundersky pack in the RV I sold, they were killed by the current owner by accidentally NOT charging them over the winter!

So my opinion is, if the charging system is properly designed, to leave the coach plugged in all winter. I would expect Roadtrek's Ecotrek system to be properly designed, especially in 2019, which is about the 7th to 8th revision IIRC. Otherwise you'd hear about a lot more Ecotreks being replaced then I've heard of. JMHO and experience.

Stewart, Brenda and kids
2006 Roadtrek 210 Versatile
Sumo Springs, 400W Solar, 320AH LiFePO4
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Old 04-14-2019, 08:02 PM   #22
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I live in Michigan had this same question. I call RT last fall and they recommended to have the shore power plugged in, batteries on, and let the battery management system maintain the batteries.

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Old 04-15-2019, 02:23 AM   #23
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Thanks for corroborating my experience about keeping lithium batteries fully charged. All it takes is a 15a 120VAC source and you don't have to have a 30a sophisticated campground like source. Every home by code has that outside. Most people already carry a 30a to 15a adapter and extension cord. Unless you store remotely without a source of power it is not much of an inconvenience.

2015 Advanced RV Ocean One Mercedes Benz Sprinter
Previous Class Bs:
2011 Great West Van Legend Sprinter
2005 Pleasure-way Plateau TS Sprinter
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