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 > Your search for posts made by '3 tons' found 531 matches.

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RE: More on LFP Charging

I have a 100a pass-thru charger and a PD 9245 - the highest combined amperage I ever witnessed is 82a (usually a bit lower as it tapers down), this feeding into 400a/h of LFP (cylindrical cells = air gaps), mfg’s ‘C’ rate is 1.0, but I can’t even get close…With just the lowly PD, I can’t hardly imagine exceeding most other mfg’s C rate… 3 tonsWould seem like a charger issue or the wiring is inadequate more than a battery limitation. I’m running 0004 / 3’ cabling with crimped, silver soldered lugs…I think it has to do with at what SOC point I begin the charge, but it’s pretty much inconsequential to me since I mostly use solar and ‘play’ somewheres in the 60-80 % SOC range…No doubt, internal resistance plays a role… 3 tons
3 tons 06/29/22 11:20am Tech Issues
RE: More on LFP Charging

This, from SolaCity: Storing Lithium-Ion Batteries The very low self-discharge rate makes it easy to store LFP batteries, even for longer periods. It is no problem to put a lithium-ion battery away for a year, just make sure there is some charge in it before placing it in storage. Something between 50% – 60% is ideal, that will give the battery a very long time before self-discharge brings the Voltage close to the danger point. 3 tons
3 tons 06/29/22 10:52am Tech Issues
RE: More on LFP Charging

I have a 100a pass-thru charger and a PD 9245 - the highest combined amperage I ever witnessed is 82a (usually a bit lower as it tapers down), this feeding into 400a/h of LFP (cylindrical cells = air gaps), mfg’s ‘C’ rate is 1.0, but I can’t even get close…With just the lowly PD, I can’t hardly imagine exceeding most other mfg’s C rate… 3 tons
3 tons 06/29/22 10:39am Tech Issues
RE: More on LFP Charging

BLF said: “How do you tell your BB "is charged" ? Also what do you mean by "is charged? I see 3-tons also disconnects after his batt bank is full and if on shore power, he runs on LFP batt for 12v and shore power for 120v, even though he has a PD converter that can sit at 13.6 doing the 12 v while also floating the LFP at 13.6v” **************** Close, but for added clarity, ‘IF on shore power’, I discontinue charging beyond an occasional cell-balancing, but never disconnect the battery (except for long term storage at about 50’ish % SOC…), I simply shut down the converter-charger…I would also add that you’ll know when it’s charged by watching on a LFP compatible SOC meter, the ‘to & fro’ dance of amps vs volts until end of cell-balancing when amps stops… Here’s what I’d penned: ***************** “Fair enough, I’d only point out (unless I’m misunderstanding…) that this charging scenario seems to assume a practice of keeping a charged battery on an active converter-charger - but other than for ‘occasional’ cell-balancing (an activity requiring 100% SOC…) why do so with a LFP?? I would counter that this apparent consternation (possibly a FWC thingy?) mainly applies to ‘unattended set and forget’ shore power charging (as is typical with lead batts)…But even if using a ‘less that ideal’ charging device for LFP, one need ask how realistic of a scenario is this?? And, to arrive at the dreaded ‘the slide-out won’t work’ gottcha, it suggest that once ‘shore power’ charging has been completed (to whatever level?), for protection, an LFP battery needs to be sequestered….Why is this?? I’d counter that one can merely shutoff the onboard converter-charger (at it’s breaker…), at which time 12v power will come from the now charged, still active battery (minor loads only, and possibly with some solar assist?), while leaving shore power connected for 120v heavy appliances (e.g. air cond, etc)… Regardless of the charging source (and, charged to whatever desired SOC?? - definitely NOT a lead acid thingy!!), one can simply opt to discontinue charging and just live for a considerable time off the battery’s deep reserves…This is exactly what I do, and with 400a/hr LFP and 660w of solar, seldom the need for shore or genny power - the last time I ran the genny was about 11 mos ago (and have since circumvented America…), and if in a park, ONLY use shore power where shading prevents harvest or when using air conditioner…In most other scenarios, the pass-thru inverter (concurrent with harvest) does the job…Just Saying”… 3 tons
3 tons 06/28/22 08:35pm Tech Issues
RE: Converter voltage drop

BFL says: “Hope the OP is still here and hoisting all this good stuff in!” Me too, I just had a double shot of Moroccan espresso :) - lol !!
3 tons 06/24/22 07:39pm Tech Issues
RE: Converter voltage drop

Hi Gdetrailer, I agree. Li are FUSSY. They can work well. I'll never own them as I camp in extreme cold. They're not that fussy, my last hookup to a power pole was Nov 3rd last year for a night when there wasn't a boondock spot. Just solar and an occasional hold over from the generator during spring. Can't be that fussy. ;) There seems to be one or two committed outliers here (non-LFP users…) that like to pretend that LFP’s are fussy - lol… Though comfortably frozen in their rigid dogma (soooo disinterested in LFP’s, kinda makes me wonder why they bother to post??:?)…Yet lots of ‘solid and non-theoretical’ information has been provided here by some ‘real-world’ actual users, and from my perspective this is where one need focus… A review of advice provided here (and past efforts penned elsewhere…) will reveal that there’s no supposed ‘Black Art’ to charging or maintaining a LFP, in fact, beyond the ‘hocus-pocus’ machinations that these few ‘non-users’ suffer to promote (validating their format of choice I suppose?? - using discernment you can avoid these ‘seemingly plausible’ distractions…). Truth is, LFP’s are quite forgiving, and in fact *LFP has by far has been the most task-free, and least bothersome format that I’ve used… * (just avoid charging below 32dF, or provide an alternative provision) 3 tons
3 tons 06/24/22 07:08pm Tech Issues
RE: Converter voltage drop

Gdetrailer says: “Looks like you signed on to a lot of work and hassle….” Maybe so to the uninitiated (or mischievous?? - I donno…), but winning over FLA converts was not my goal, nor a cogent point of the OP’s thread…Perhaps you should consider sticking with wet-cells and just feel self-assured (vindicated…) about what’s working well for you - Glad to hear it!! 3 tons
3 tons 06/24/22 12:50pm Tech Issues
RE: Converter voltage drop

BFL said: “I still have not got an answer for what you do if your rig has an inverter/charger. Last heard, an inverter/ charger will not operate at 12v unless it it is connected to a battery to run its own systems. Not sure if it still would do 120v pass through.” ************ My pass-thru inverter-charger always stays connected to the batteries, whether on shore power or not…As power passes thru, it normally remains in just the ‘standby mode’ (or, OFF) - it’s built-in ATS switch prevents conflicts with incoming shore power… 3 tons
3 tons 06/24/22 11:41am Tech Issues
RE: Converter voltage drop

FWIW, LFP Simple Rules I live by - JMO 1) Except for occasional cell re-balancing, no need to fully recharge a LFP on a ‘wet-cell like’ routine basis… 2) Monitor closely the last few percent of recharge to 100% SOC thru to end of cell-balancing activity… 3) Post cell-balancing activity, discontinue Boost charging (avoiding the longer term) - shut-off 12v converter (at breaker) and thereafter run minor 12v loads from the battery (this still supplies active 120v for larger appliances). When off-grid, LFP can be supplemented with harvest… 4) For long term storage, disconnect and store LFP somewhere in the mid-SOC range (60-40’ish % SOC range). 3 tons
3 tons 06/24/22 11:34am Tech Issues
RE: Converter voltage drop

You might consider converting the WFCO to something better and more compatable: https://battlebornbatteries.com/product/progressive-dynamics-lithium-replacement-converter-section-for-electronic-power-center-55-amp/ 3 tons
3 tons 06/23/22 11:14am Tech Issues
RE: Q: pump rattle - SHURFLO 4008-101-A65 Revolution

I would check the four stainless screws that secure the pump head to the body…Three of mine were sheared off, possibly due to freezing, though the basement is well heated and I’m not aware of a single time that I’ve camped or driven that cold…Camper is stored indoors… 3 tons
3 tons 06/22/22 06:05pm Tech Issues
RE: New 2 stage PD lithium Converter charger yet?

Well after all this, what’s left to know about LFP’s!! - lol :) 3 tons
3 tons 06/21/22 05:58pm Tech Issues
RE: Magical Campgrounds found With A TC

As with party affiliation, nowadays I tend to keep this kinda information close to my vest - lol :) 3 tons
3 tons 06/20/22 01:18pm Truck Campers
RE: New 2 stage PD lithium Converter charger yet?

I believe a far better investment would be in having a LFP compatible shunt based SOC meter (like Victron or equivalent.) so that you can accurately determine SOC and be able to monitor the occasional end of cell balancing activity… 3 tons
3 tons 06/19/22 08:21am Tech Issues
RE: battery to inverter wiring

Cabling is your bottleneck, a very common problem that causes grief for the poor 2000w inverter…Early on, I learned this the hard way, but now likely a bit overkill at 0004, 3’ with silver soldered and crimped copper lugs, but no more inverter alarms!! 3 tons
3 tons 06/17/22 03:27pm Tech Issues
RE: New 2 stage PD lithium Converter charger yet?

Agreed, but recall the saying, “we go to war with the Army we have, rather than the one we want”, and learned newbees with a bit of *awareness will likely have success when using most conventional chargers… * Best General LFP Practices: Avoid unattended final-stage ‘extended’ (beyond cell-balancing) charging, storing batt at about 50% SOC (isolating), no charging at or below 32dF… 3 tons
3 tons 06/17/22 12:34pm Tech Issues
RE: New 2 stage PD lithium Converter charger yet?

Per BFL, “This all only applies to being on shore power using the converter. On generator you don't leave it running long enough to matter. On solar it might matter depending how early in the day you get to Full.” *********** Fair enough, I’d only point out (unless I’m misunderstanding…) that this charging scenario seems to assume a practice of keeping a charged battery on an active converter-charger - but other than for ‘occasional’ cell-balancing (an activity requiring 100% SOC…) why do so with a LFP?? I would counter that this apparent consternation (possibly a FWC thingy?) mainly applies to ‘unattended set and forget’ shore power charging (as is typical with lead batts)…But even if using a ‘less that ideal’ charging device for LFP, one need ask how realistic of a scenario is this?? And, to arrive at the dreaded ‘the slide-out won’t work’ gottcha, it suggest that once ‘shore power’ charging has been completed (to whatever level?), for protection, an LFP battery needs to be sequestered….Why is this?? I’d counter that one can merely shutoff the onboard converter-charger (at it’s breaker…), at which time 12v power will come from the now charged, still active battery (minor loads only, and possibly with some solar assist?), while leaving shore power connected for 120v heavy appliances (e.g. air cond, etc)… Regardless of the charging source (and, charged to whatever desired SOC?? - definitely NOT a lead acid thingy!!), one can simply opt to discontinue charging and just live for a considerable time off the battery’s deep reserves…This is exactly what I do, and with 400a/hr LFP and 660w of solar, seldom the need for shore or genny power - the last time I ran the genny was about 11 mos ago (and have since circumvented America…), and if in a park, ONLY use shore power where shading prevents harvest or when using air conditioner…In most other scenarios, the pass-thru inverter (concurrent with harvest) does the job…Just Saying :) 3 tons
3 tons 06/16/22 05:43pm Tech Issues
RE: New 2 stage PD lithium Converter charger yet?

In regards to the previous, one might also note that BFL’s fairly comprehensive points on ‘set and forget’ style charging would seem to apply to all battery types… 3 tons
3 tons 06/16/22 01:57pm Tech Issues
RE: New 2 stage PD lithium Converter charger yet?

I just sent this email to a pal: “Well, BFL is correct in that it’s a poor strategy to use a ‘set and forget’ charger” - Further, I agree with most else of what he stated :) In my view, a ‘true LFP charger’ might have a smart chip in it that would recognize when cell balancing is complete (holding period, and end of current calls), but seriously, how often does one need to fully charge a LFP, and no need to keep on charger when not in use… My PD in bulk outputs 14.4v (likely 14.3 at terminals), but I never FULLY charge while not in attendance (at least during the last few % of upper SOC), then, after determining completion of balancing on Victron BMV 712, shutdown the PD (or solar controller) after balancing - BUT, I infrequently do a ‘FULL charge’ because, except for cell balancing (incl, meter re-sync’s), most often there’s no need to do such, thus, during ‘routine charging’ (considering LFP’s greater usable capacity…) I mostly charge to around 85-90’ish % using off-grid solar harvest rather than the PD… On the other hand, Victron’s BMV SOC meter has a built-in programmable load relay feature that can be configured to a inverted parameter function - by this means, the PD (or whatever…) could be shutdown (and restarted) upon reaching a certain voltage… Again, based on my own camping style I see little effort and far more convenience (due to usable capacity) to the charging LFP’s than with my former GC2’s - JMHO 3 tons Sent from my iPad
3 tons 06/16/22 12:22pm Tech Issues
RE: New 2 stage PD lithium Converter charger yet?

Another factor (though widely overlooked…) that impacts longevity is determined during the manufacturing process via final testing, and suggest the cost difference between say a BattleBorn or an Aims (grade ‘A’ cells), versus the bargain brands - note that ‘non’ grade ‘A’ cells will generally* lack a QR code designation… *except where a A cell is re-inventoried as a B cell (Video clip at bottom): https://www.seplos.com/news/cheap-battery-part-1-grade-a-vs-grade-b-what-is-the-grade-b-lithium-ion-battery-cells-69852.html Summary: https://www.lithiumstoragebattery.com/news-grade-a-and-grade-b-for-lithium-ion-battery.html 3 tons
3 tons 06/16/22 09:02am Tech Issues
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