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Open Roads Forum  >  Tech Issues

 > Lifepo4 float setting?

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3 tons

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Posted: 05/12/22 09:11am Link  |  Quote  |  Print  |  Notify Moderator

StirCrazy wrote:

BFL13 wrote:

Might not matter much to some, but question was raised what setting to use. Mystery remains why Bogart says 2% while Victron says maybe 5% for tail current for LFP

OP says LFP advice is all over the map.


the question was about the float setting, man did we take a tri around the world in this thread haha


Well, regarding frustration, ‘confusion’ can sometimes be overrated - From the Victron Manual:

“03. Tail current:
Once the charge current has dropped to less than the set tail current (expressed)…”

Remark:

“Some battery chargers stop charging when the current drops below a set threshold. The tail current must be set higher than this threshold.
Default Range Step size
4 % 0.5 – 10 % 0.1%…..”

But AGAIN, this is why my previous remarks regarding meter validation (as a simulation), and where ACTUAL LFP Ownership (rather than confusing serial pontifications) can often make a solid difference…

3 tons

Cptnvideo

Arizona - most of the time

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Posted: 05/12/22 09:24am Link  |  Quote  |  Print  |  Notify Moderator

Totally agree, 3 tons. Victron also states that a couple parameters may need to be adjusted due to inherent variations in solar charging (clouds, etc).
Its nice that LFPs have a large operating range, so that settings are not that critical.


Bill & Linda
Arizona
2019 Dodge Laramie 3500 dually 4x4 diesel
Hensley Trailer Saver BD5 hitch
2022 Grand Design Solitude 378MBS
1200 watts solar, 3kw inverter/charger, 3 206AH LiFePo4 batteries

3 tons

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Posted: 05/12/22 10:42am Link  |  Quote  |  Print  |  Notify Moderator

Cptnvideo wrote:

Totally agree, 3 tons. Victron also states that a couple parameters may need to be adjusted due to inherent variations in solar charging (clouds, etc).
Its nice that LFPs have a large operating range, so that settings are not that critical.


True enough Sir, yet the ongoing ‘implicit’ forum suggestions (actually, a serial stream of false ‘wack-a-moles’…..) suggesting that LFP’s are ‘somehow too complicated’ for the ‘non-technical’ user, yet (as is the case for FLA’s - though SiO2’s, not so much…) the answers are readily available, and per ‘actual user’ experience (the key!!) such implications are at this juncture, forgone silliness…In fact ‘once *informed’, the LFP user soon finds that LFP’s far easier to live with than Lead-plate type batteries, a value quotient that may for many help justify LFP’s higher initial acquisition cost…JMO


* (e.g. overcoming the anti-LFP Camp’s ‘myth-launching’ - lol)

3 tons

Cptnvideo

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Posted: 05/12/22 10:52am Link  |  Quote  |  Print  |  Notify Moderator

After making a couple adjustments to settings (thanks 3 tons and others), I am very happy. 100% SOC at 8:45 MST, voltage range since midnight 12.59-13.55, solar currently (9:51 MST) putting our 860 watts.

3 tons

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Posted: 05/12/22 11:44am Link  |  Quote  |  Print  |  Notify Moderator

…. solar currently (9:51 MST) putting our 860 watts.”…

Exactly, thanks to the truly unmatched charge recovery rate provided by LFP’s…

3 tons

3 tons

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Posted: 05/12/22 01:01pm Link  |  Quote  |  Print  |  Notify Moderator

BTW, in my case, having 660w solar and 400 a/hr ‘fast recovery’ LFP enables me to run the 11kbtu air conditioner for say about 5 hours or so (compressor cycling, concurrent with harvest), typically with full recovery by next day’s noontime…A recovery rate (and ‘usable’ amp/hr capacity!!) not possible with my former Golf Cart batts…Of further interest, because of this one might also note here that (due to LFP’s rapid recovery rate), having an amount of solar that’s equal to the air conditioner duty cycle wattage (meaning a presumed zero sum arrangement) is NOT really necessary. For our ‘uninitiated’ friends, yet another example of what’s a less than obvious value worth considering…(So predictably, grab your calculator’s that “say it ain’t so” - lol!)…JMHO, ‘real-world’ matters, actual user experience may vary [emoticon]

3 tons

Itinerant1

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Posted: 05/12/22 01:29pm Link  |  Quote  |  Print  |  Notify Moderator

Nothing like living on grid while off grid. [emoticon]


12v 500ah (5,120Wh usable), 20 cells_ 4s5p (GBS LFMP battery system). 8 CTI 160 watt panels (1,280 watts)2s4p,Panels mounted flat. Magnum PT100 SCC, Magnum 3012 hybrid inverter, ME-ARC 50. Installed 4/2016 been on 24/7/365, daily 35-45% DOD 2,000+ cycles.

3 tons

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Posted: 05/12/22 02:44pm Link  |  Quote  |  Print  |  Notify Moderator

Itinerant1 wrote:

Nothing like living on grid while off grid. [emoticon]


Agreed, kinda makes my ‘carry along’ Honda 2200i a pricy paperweight …lol

3 tons

Cptnvideo

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Posted: 05/12/22 03:21pm Link  |  Quote  |  Print  |  Notify Moderator

3 tons wrote:

Itinerant1 wrote:

Nothing like living on grid while off grid. [emoticon]


Agreed, kinda makes my ‘carry along’ Honda 2200i a pricy paperweight …lol

3 tons


LOL. Yeah, we bought a 3500 watt Harbor Freight inverter/generator. So far, it has been run 10 minutes (just to make sure it didn't need to be returned).

2oldman

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Posted: 05/12/22 03:32pm Link  |  Quote  |  Print  |  Notify Moderator

Yep, only air con for my 2 2200s. 99% solar. Best investment ever. I can do maybe an hour of air on battery.. that's about it.

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