6 v GC batteries versus 12 v lithium deep cycle batteries

2oldman wrote:
OP is long gone.

As is authentic enquiry - sadly, discourse again corrupted (hacked?) via an insurmountable black hole of BMS ‘gotcha’s’ !!
:R

3 tons

OP is long gone.

A good BMS monitors voltage at the cell level. I can't know what Trojan features include. Although I would assume it would monitor at the cell level as that would be how the top balancing would be determined. In normal use I would not go below 12.5. At that point you are off the cliff.

I got the (wrong?) idea the BMS cut off at 9.x (just below the depleted voltage of 10.0), was taken from the total voltage, so if un-balanced at 9.x total, one cell might be lower than one cell should be into cell damaging low voltage.

That could be wrong, so not meant to be bogus info, only a question up for clarification.

The internal BMS should be cutting off the discharge at low voltage before damage is done. Same as the top end. If you are consistently going into the lowest 20% I will recommend more battery or at least charge closer to the top. Then you end up top balancing. It all works out fine without worry.

Yes bottom balancing has been replaced with top balancing. Bottom balance was from the days before BMSs were put on the battery. Top balance is a more practical method as it happens when power is available vs near shut down.

The Trojan guide mentioned that not balancing could lead to a "low" cell going "too low" when you got to a low SOC (as measured by the average voltage?) where the batt is "top balanced" as a reason to balance.

ISTR ( needs to be confirmed) "too low" for a cell ruins it for good.

AFAIK these RV type LFPs are not "bottom balanced".

BFL13 wrote:
Why is it being "obsessed" when you try to follow the (eg) Trojan users' guide?

On a more "casual" approach, how do you know how much you can get away with when not doing what they say? You will only know that by not doing what they say, and seeing how long you got away with it.

Many of us learned battery care from our first ("learner set") set of RV batteries. If you have the money, then you could just count your first set of LFPs as your "learner set" I suppose. :)

Unlike lead-acid you do not lose capacity for not doing the full charge and balance. LFP actually extends the life by doing partial charges. So the longer you get away with it the more you get away with.

I think outside influences have grated on people's nerves. Families jammed indoors has got to rub things tender. It's easier down here where things are a different reality.

time2roll wrote:
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.

Why is it being "obsessed" when you try to follow the (eg) Trojan users' guide?

On a more "casual" approach, how do you know how much you can get away with when not doing what they say? You will only know that by not doing what they say, and seeing how long you got away with it.

Many of us learned battery care from our first ("learner set") set of RV batteries. If you have the money, then you could just count your first set of LFPs as your "learner set" I suppose. :)

Well, I kinda doubt that any Mod would favor the presence of an unchecked disinformation campaign...JMHO

I would suspect that most who visit here (the “Snooty”??) are seeking ‘solid information’, so grow tired of this undermining disinformation crusade - and, I would only ask that when reproducing a previous comment I’ve made, rather than ‘cherry-picking’ a select few words to make a point (valid context matters, why then omit??), in all sincerity, words should be considered within their proper context (to be fair, context matters, so as I have done, provide the link!!).

3 tons