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Open Roads Forum  >  Tech Issues

 > Converter voltage drop

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time2roll

Southern California

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Posted: 06/24/22 02:23pm Link  |  Quote  |  Print  |  Notify Moderator

Gdetrailer wrote:

I thought the idea of LFP batteries was to eliminate "maintenance" and hassle [emoticon]

Looks like you signed on to a lot of work and hassle [emoticon]

MY FLA requires a simple plug in and forget and once a year check and add water if needed [emoticon] Maximizing my enjoyment of my RV without the work.

My PD takes very good care of my FLAs yr round and keeps them in good working condition that takes them well over 10yrs of life.
And the PD charging the LFP will not need that water, provide twice the power, and live through three sets of FLA.


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pianotuna

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Posted: 06/24/22 03:55pm Link  |  Quote  |  Print  |  Notify Moderator

Hi Gdetrailer,

I agree. Li are FUSSY.

They can work well.

I'll never own them as I camp in extreme cold.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

BFL13

Victoria, BC

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Posted: 06/24/22 05:24pm Link  |  Quote  |  Print  |  Notify Moderator

mpvuk wrote:

theoldwizard1 wrote:

Any QUALITY converter/charger will have a specific setting for LiFePO4. Use it !

Personally, I would just eliminate the converter and buy an inverter/charger/automatic transfer switch.


New to this so hopefully replying in proper format...all LFE specific converter/chargers I've found have a 14.6V bulk phase. My battery mfg says to stay at 14.4 or less in bulk. Are there LFE chargers that start at 14.4? Regarding an inverter/charger, I already have a 2200W pure sine wave inverter that Works great. My best value seems to be using existing inverter and upgrading the converter.


PowerMax says they made their LFP compatible converter (LKL model) according to what BattleBorn told them and that's that. Obviously, PD did the same. That leaves out other LFP makers and their specs, which are not always the same as BB's.

At least the LKL still has the adjustable voltage option, so you can't go wrong there, unlike PD's L model unless your batt's specs are the same. As posted earlier, with your specs you will be ok with a standard 14.4v 3-stage PD with the Charge Wizard, if you find that easier than using the manually adjusted PMX LKL or LK.

Perhaps your batts can stand 14.6 and just have recommended 14.4 like some other LFP specs say? Can you link to your particular brand and model of LFP so we can see its specs?


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Itinerant1

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Posted: 06/24/22 06:02pm Link  |  Quote  |  Print  |  Notify Moderator

pianotuna wrote:

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. [emoticon]

I should add that the longest stretch boondocking off of solar and hold over charge with generator and lfp was over 1,000 days. Not that fussy.

* This post was edited 06/24/22 06:15pm by Itinerant1 *


12v 500ah, 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+ partial cycles.

BFL13

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Posted: 06/24/22 06:57pm Link  |  Quote  |  Print  |  Notify Moderator

Itinerant1, what would you advise the OP wrt to his possible converter replacement for his ? brand LFPs?

3 tons

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Posted: 06/24/22 07:08pm Link  |  Quote  |  Print  |  Notify Moderator

Itinerant1 wrote:

pianotuna wrote:

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. [emoticon]


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??[emoticon])…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

Itinerant1

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Posted: 06/24/22 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

My personal choice is a programmable inverter/ charger but my use is much different than most.

If I was downsizing and was going to stay with a converter than it would be one that Time2roll suggested in the 3rd post of this thread. I do have one of those converters hanging in the front compartment just disconnected from the system.

BFL13

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Posted: 06/24/22 07:20pm Link  |  Quote  |  Print  |  Notify Moderator

Itinerant1 wrote:

My personal choice is a programmable inverter/ charger but my use is much different than most.

If I was downsizing and was going to stay with a converter than it would be one that Time2roll suggested in the 3rd post of this thread. I do have one of those converters hanging in the front compartment just disconnected from the system.


Thanks. Totally agree/concur (not sure which one of us is senior) on that.

Hope the OP is still here and hoisting all this good stuff in! [emoticon]

3 tons

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Posted: 06/24/22 07:39pm Link  |  Quote  |  Print  |  Notify Moderator

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 [emoticon] - lol !!

mpvuk

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Posted: 06/25/22 05:58pm Link  |  Quote  |  Print  |  Notify Moderator

OP here...thanks all for the input. A took a closer look and my converter to battery run is closer to 15' one way, with mfg installed 6g wire. So a re-wire seems appropriate. So I've decided to keep the WFCO and use as a converter only when on-grid. It works fine in that capacity.

Then buying a Mean Well NPB-750 charger to use with the generator off-grid. I can place about 3' from Batteries (which are 2 Weize 100ah). I think a better solution than replacing the converter/charger with a better one (was leaning toward the PD 9200 series). And I would still want to upgrade wiring if going the replacement route. I have left over 2/0 wire from the battery install that I can use with the Mean Well.

Still open to suggestions if I'm still wandering around left field on this.

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