6 v GC batteries versus 12 v lithium deep cycle batteries

There is no particular reason to be obsessed with balancing or fully charging the LFP.
This drive for some perfect charge and balance is a hangover from the days of servicing lead-acid.

I agree. I saw where he went after another guy (Freep was it?) drove him crazy. Poor old Freep never found the block button I guess.

Freep

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Posted: 04/19/21 01:40pm Link | Quote | Print | Notify Moderator
3 tons wrote:

“ The snark and derision is unnecessary.”??...Snark, How so ?? (apparently only when I use your same words??)..I really don’t get it - I guess I forgot to check the box for a ‘sensitivities waiver’..

3 tons, in the High NV Desert, where sensitivities are not a currency


Please stop.

Surprising why a Mod has not shut down this playground squabble yet. Most of the time it does not go on for this long. :B

BFL13 wrote:
I do not belong to the snooty LFP community, and don't even have the T-shirt, but I can read.

BB says to wait 20 minutes per battery to be sure the battery is balanced, and Trojan says 10 minutes (for one battery?), but whatever---it takes time to get that done, so how can it be a good idea to stop the charge as soon as you get to Vabs (which needs to be over 14v--ISTR BB saying it needs to be 14.2v but they also say over 14, so whatever)

2.For your Bulk/Absorption stage, the ideal voltage is between 14.2v-14.6v. For full charge and BALANCE, the absorption mode should be set to last for at least 20 minutes per battery (for multiple batteries in parallel).

I don't think a "good old boy" approach (if all else fails, read the instructions) to LFP charging is appropriate considering what LFPs cost, but YMMV.

Though I found this of no relevance, maybe you can find the answer to your question in what you’ve previously offered :


https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30210186/srt/pa/pging/1/page/6.cfm

3 tons

I do not belong to the snooty LFP community, and don't even have the T-shirt, but I can read.

BB says to wait 20 minutes per battery to be sure the battery is balanced, and Trojan says 10 minutes (for one battery?), but whatever---it takes time to get that done, so how can it be a good idea to stop the charge as soon as you get to Vabs (which needs to be over 14v--ISTR BB saying it needs to be 14.2v but they also say over 14, so whatever)

2.For your Bulk/Absorption stage, the ideal voltage is between 14.2v-14.6v. For full charge and BALANCE, the absorption mode should be set to last for at least 20 minutes per battery (for multiple batteries in parallel).

I don't think a "good old boy" approach (if all else fails, read the instructions) to LFP charging is appropriate considering what LFPs cost, but YMMV.

3 tons wrote:

Once the LFP is charged (to whatever desired user acceptable level - a LFP thingy...) with an existing multi-stage converter-charger, all you need to do is shut off the converter-charger at the breaker panel (or solar charge controller)...Another option (if so inclined...) would be to install a disconnect switch at the battery terminal, and keep the onboard converter-charger active, Presto, problems solved...

3 tons

I was only making a point that most converters (or all of them?) don't automatically do what is the best for LFP. And neither do many solar controllers - though in a decent controller you are normally able to set a custom profile for LFP.

Yes, you could shut off the charger when voltage hits 14.x. By the same token I could eliminate solar controller altogether and charge the battery directly from solar panel, keeping an eye on it and disconnecting when it hits Absorb. (In fact, did this for a month when my controller died - even though it was 24V panel with 12V battery). You just have to watch it. Having an equipment doing watching and disconnecting would've been much better :)

BFL13 wrote:
Itinerant1, in your opinion, is jaycocreek seeing balancing on his smart shunt from what he describes or not?

Is that the same as what 3 tons sees? (I can't see his posts) If so, why wouldn't that show on any monitor such as the Trimetric?

It was probably balancing during the 14.4/ 13.6 cycles but it would of happened at the higher voltage period but that is not the bms balancing, that's the charger doing what it was programmed to do?

"If" the bms was causing the shutdown and restarting I would guess the cells certainly have runners that the passive balancing can't keep up with. Without the ability to see individual cell voltages it's just my guess what someone else's batteries are doing.

You do understand what passive balancing or active balancing is or does, most dropins will use passive just because it's cheaper. My cells use passive with the sense boards (bms component) that start balancing when a cell reaches 3.55v, the sense boards will draw 0.5A until the voltage has dropped below 3.55V. During this process it's normal for some cells to balance more than others and some cells to rarely balance.

For ‘the yet to be initiated’, here is ‘just one’ in a continuing stream of BFL’s faked data based constructs -

https://www.rv.net/forum/index.cfm/fuseaction/thread/tid/30210186/srt/pa/pging/1/page/6.cfm

3 tons

Itinerant1, in your opinion, is jaycocreek seeing balancing on his smart shunt from what he describes or not?

Is that the same as what 3 tons sees? (I can't see his posts) If so, why wouldn't that show on any monitor such as the Trimetric?

3tons,

I've not blocked anyone for many years. But recently two members called me a liar, one directly and one indirectly. So with sadness, I did block them. It is too bad.