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Old 11-25-2020, 01:18 AM   #1
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2021 16' Caravel
Kirkland , Washington
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Do you disconnect solar or LiFePo4 battery when not using your trailer

Hello,
I am wondering if folks disconnect solar charger(or panel) or lithium battery after each use of your trailer (I am not talking about winter storage)?
Asking as per this article, keeping LiFePo4 battery at high SOC isn't good for the battery life:
https://www.solacity.com/how-to-keep...tteries-happy/

Let's say I use my trailer mostly during weekends, for the rest of the week, if I don't disconnect either solar or battery, what's going to happen -
1. Say battery started at low SOC after weekend use. during the weekday, solar charger controller would slowly top it off at 14.4v which is ~100% SOC (high SOC)
2. During night, parasitic current will bring the voltage slightly down.
3. Next morning when the sun comes up, since the voltage is below 100% the solar charger controller would top it off again at 100% SOC.

So I think the battery is cycle between 100% SOC and maybe ~99% (depends on parasitic current amp), this seems to be bad for Lithium battery life if I read that article right.

So do folks disconnect one of these 2, when you are not using the trailer? I am not talking about winter storage, just in camping season but when you are not using your trailer.

Thanks!
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Old 11-25-2020, 08:44 AM   #2
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Trent Woods , North Carolina
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Nope! That article does say that if you cannot stop the charge, set it to float at 13.6 or less and you will be fine. Well my solar controller does that. It charges the battery, goes into float and the controller voltage drops, then the next day it goes into bulk when the sun comes up. You should be fine with any good solar controller set for Lithium.
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Old 11-27-2020, 02:00 PM   #3
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no, i let the solar keep the lion charged
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Old 12-26-2020, 05:11 PM   #4
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Same here let my solar charge my battery that's why I put the solar in keep the battery charged
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Old 01-01-2021, 03:00 PM   #5
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This paper is interesting/relevant: https://uwspace.uwaterloo.ca/bitstre...atton_John.pdf

For LFP batteries, the 100% SOC degradation is highly temperature dependent. Stored at 35C (95F) Capacity is reduced to 90% after 28 months. Lower temperatures would take even longer to reach 90%. A lot of the concern for e.g. laptop batteries is because they can be in a much higher temperature environment. 100% SOC at 60C will kill a battery in just 6 months or so.

Note that for most LFP cells floating them at 13.6 (3.4v per cell) will still charge them to nearly 100% over a matter of days. What it wont do is *over*charge them or do any immediate damage so long as the cells are reasonably balanced.
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