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otrfun
On The Road
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Joined: 09/08/2012
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Veebyes wrote:We buy lithium AA & AAA batteries, stick them in a drawer & don't get around to using them for months, years even, take them out & they are just fine. Ditto. Just found some Energizer AA lithium batteries stuffed in a box with a Garmin GPS we used for off-shore excursions on the east/west coasts years ago. They're almost 10 years old and still measure 1.82v! When new, I believe they measure ~1.87v. Amazing.
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Veebyes
Bermuda & Maryland Eastern Shore
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Joined: 11/24/2003
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As a former boat owner my boat was kept on a revolving mooring, no connection to shore, no solar to maintain the battery bank. It would sit unattended for weeks, months sometimes, with no charging. The boat was dead. Nothing but a bilge pump hard wired to the battery.
Never had a problem. This experience is not unusual. People such as farmers & construction companies leave machinery unattended for months at a time.
This with wet cell batteries which self discharge much faster than AGM, gel cell or lithium.
Read the manufacturers instructions on care & follow them.
Boat: 32' 1996 Albin 32+2, single Cummins 315hp
40+ night per year overnighter
2007 Alpenlite 34RLR
2006 Chevy 3500 LT, CC,LB 6.6L Diesel
Ham Radio: VP9KL, IRLP node 7995
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StirCrazy
Kamloops, BC, Canada
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Joined: 07/16/2003
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otrfun wrote:theoldwizard1 wrote: . . . What I don't know is if below freezing will affect the battery life while discharging or storing. Specs vary from manufacturer to manufacturer, but generally speaking, maximum recommended discharge current tapers downward as temps drop below 32f or so. Probably wouldn't want to do more than a .10c - .15c discharge at temps below, say, -10c (14f).
Long-term storage recommendations are not too stringent. If you follow the temp recommendations for charging (typically 0-40c; 32-104f) that should be acceptable. If you want the absolute best for your cells, strive for 25c (77f) and 30-50% SOC.
the specs for the new cells I ordered are pretty good that way, 0.5C discharge down to -30C short term storage of a month -40C/F long term storage -25C and charger from -5C to +60C. but it totaly does depend on the manufacture and for premades, they tend to add a little more of a buffer so they have less warenty clames they have to pay.
2014 F350 6.7 Platinum
2016 Cougar 330RBK
1991 Slumberqueen WS100
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StirCrazy
Kamloops, BC, Canada
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Joined: 07/16/2003
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3 tons wrote:“And by "storage," I mean "whenever I'm not actually on a camping trip, the batteries go onto the trickle charger."
LFP’s Uber low self-discharge rate makes the solution to this quandary easy…I simply added a battery ‘side’ post knife switch disconnect from Amazon which isolates the battery whenever camper is not in use…No need to keep on a trickle charger….In this way shore power (if available?) can continue to be used to operate the 12v systems via the onboard converter-charger…
I just don't plug in at home anymore and shut off my solar. no parasitic draws in my 32 yeear old camper... as long as I am under 90% I am happy for winter storage.
in the summer I turn the solar the morning before we are going camper so it is full when I leave and it can do its top ballance then I change the profile to run from 10% to 90%. I figure one top ballance for eaxh camping trip is enough.
when we upgrade I'll probably have to add somthing like that to my battery.
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otrfun
On The Road
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Joined: 09/08/2012
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StirCrazy wrote:otrfun wrote:theoldwizard1 wrote: . . . What I don't know is if below freezing will affect the battery life while discharging or storing. Specs vary from manufacturer to manufacturer, but generally speaking, maximum recommended discharge current tapers downward as temps drop below 32f or so. Probably wouldn't want to do more than a .10c - .15c discharge at temps below, say, -10c (14f).
Long-term storage recommendations are not too stringent. If you follow the temp recommendations for charging (typically 0-40c; 32-104f) that should be acceptable. If you want the absolute best for your cells, strive for 25c (77f) and 30-50% SOC. the specs for the new cells I ordered are pretty good that way, 0.5C discharge down to -30C short term storage of a month -40C/F long term storage -25C and charger from -5C to +60C. but it totaly does depend on the manufacture and for premades, they tend to add a little more of a buffer so they have less warenty clames they have to pay. Very impressive. As far as advertised specs, it can work both ways. Make them conservative so they can reduce warranty claims, or make it look like their cells walk on water to sell more cells/batteries. Me, I tend to give the research and testing produced by independent labs the most creedence.
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StirCrazy
Kamloops, BC, Canada
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Joined: 07/16/2003
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otrfun wrote:StirCrazy wrote:otrfun wrote:theoldwizard1 wrote: . . . What I don't know is if below freezing will affect the battery life while discharging or storing. Specs vary from manufacturer to manufacturer, but generally speaking, maximum recommended discharge current tapers downward as temps drop below 32f or so. Probably wouldn't want to do more than a .10c - .15c discharge at temps below, say, -10c (14f).
Long-term storage recommendations are not too stringent. If you follow the temp recommendations for charging (typically 0-40c; 32-104f) that should be acceptable. If you want the absolute best for your cells, strive for 25c (77f) and 30-50% SOC. the specs for the new cells I ordered are pretty good that way, 0.5C discharge down to -30C short term storage of a month -40C/F long term storage -25C and charger from -5C to +60C. but it totaly does depend on the manufacture and for premades, they tend to add a little more of a buffer so they have less warenty clames they have to pay. Very impressive. As far as advertised specs, it can work both ways. Make them conservative so they can reduce warranty claims, or make it look like their cells walk on water to sell more cells/batteries. Me, I tend to give the research and testing produced by independent labs the most creedence.
these are the new K cells from EVE and the specs are from eve's testing sheets not a salesman ![[emoticon]](http://www.rv.net/sharedcontent/cfb/images/wink.gif "wink") . now am I going to set them to charge ar -5C, naa I'll keep it at +1 as my batteries are inside the living space so will never get that cold anyways, I may test the cold discharge though... well then again naa, I aint going camping at -30C haha, but the thing of interest to me was you can short term store much colder than long term (short term they describe as 30 days or less) and the fact that they seam to be a significantly more robust than the normal 280AH cells rated at 5000 cycles (100% to 0%) instead of 3500and I realy like the new double tapped termanals on them two bolts for power path instead of one skinny post.
Steve
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profdant139
Southern California
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Joined: 11/14/2005
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OK, Steve, I'll continue to display my ignorance -- what are double tapped terminals, and why are two terminals better than one? And why a fat terminal vs a skinny one?
The more I know, the more I realize how much I don't know.
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)
Our trips -- pix and text
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"A journey of a thousand miles begins with a single list."
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S Davis
Western WA
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Joined: 08/11/2005
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StirCrazy wrote:otrfun wrote:StirCrazy wrote:otrfun wrote:theoldwizard1 wrote: . . . What I don't know is if below freezing will affect the battery life while discharging or storing. Specs vary from manufacturer to manufacturer, but generally speaking, maximum recommended discharge current tapers downward as temps drop below 32f or so. Probably wouldn't want to do more than a .10c - .15c discharge at temps below, say, -10c (14f).
Long-term storage recommendations are not too stringent. If you follow the temp recommendations for charging (typically 0-40c; 32-104f) that should be acceptable. If you want the absolute best for your cells, strive for 25c (77f) and 30-50% SOC. the specs for the new cells I ordered are pretty good that way, 0.5C discharge down to -30C short term storage of a month -40C/F long term storage -25C and charger from -5C to +60C. but it totaly does depend on the manufacture and for premades, they tend to add a little more of a buffer so they have less warenty clames they have to pay. Very impressive. As far as advertised specs, it can work both ways. Make them conservative so they can reduce warranty claims, or make it look like their cells walk on water to sell more cells/batteries. Me, I tend to give the research and testing produced by independent labs the most creedence.
these are the new K cells from EVE and the specs are from eve's testing sheets not a salesman . now am I going to set them to charge ar -5C, naa I'll keep it at +1 as my batteries are inside the living space so will never get that cold anyways, I may test the cold discharge though... well then again naa, I aint going camping at -30C haha, but the thing of interest to me was you can short term store much colder than long term (short term they describe as 30 days or less) and the fact that they seam to be a significantly more robust than the normal 280AH cells rated at 5000 cycles (100% to 0%) instead of 3500and I realy like the new double tapped termanals on them two bolts for power path instead of one skinny post.
Steve
They are not much more robust, they changed the testing specifications. The older LF280N that I have are rated at double the amp draw, 1c for 3500 cycles with a compression fixture. The new LF280K are rated at half that at .5c for 6000 cycles with a compression fixture.
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Cptnvideo
Arizona - most of the time
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Joined: 11/05/2006
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I like the SOK 206ah LFPs so much that I just bought 2 more. Haven't installed them yet as I'm waiting for the weather to warm up a little. That will bring my total capacity to 1030 ah.
Bill & Linda
Arizona
2019 Dodge Ram Laramie 3500 dually 4x4 diesel
Hensley Trailer Saver BD5 hitch
2022 Grand Design Solitude 378MBS
1600 watts solar, Victron 150/100 MPPT controller, GoPower 3kw inverter/charger, 5 SOK 206AH LiFePo4 batteries for 1030 ah
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TechWriter
Part-Timing Again
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Joined: 12/22/2002
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Cptnvideo wrote:I like the SOK 206ah LFPs so much that I just bought 2 more. Haven't installed them yet as I'm waiting for the weather to warm up a little. That will bring my total capacity to 1030 ah.
Did you get the SOKs with heaters?
2004 - 2010 Part Timer (35’ 2004 National RV Sea Breeze 8341 - Workhorse)
2010 - 2021 Full Timer (41’ 2001 Newmar Mountain Aire 4095 DP - Cummins)
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