"Cheap" LiFePO4 drop-in update

[hzcruiser]

Originally Posted by sailorboy1

[...]

But are you planning to just leave your battery at 100% all the time? My bank normally gets to 100% on 90% of days, but it is cycling all the time with use.

Batteries are consumables on boats, even LFP ones.

Thanks for your first hand experiences! And BTW, you mentioned that you charge the LFPs to 14.1V which is not 100% SOC and hence you should be just fine either way.

[hzcruiser]

Originally Posted by MerloPaolo

Hello everyone, I want to install batterie lifepo4 in my boat. Has anyone heard of this company? Please give me some advice.

Welcome to the forum, Merlo.

Have you considered opening a new thread for your question?

My answer would be "no", never heard of them, and 500 EUR for 100Ah@12V sounds quite expensive to me.

[Wandering1]

https://acrobat.adobe.com/id/urn:aai...6-f084744305c6

[sailorboy1]

Originally Posted by s/v Jedi

We have been talking about SOC% for batteries in storage and some have been adamant that storing at 100% soc is fine and makes no difference. Talk about this shortening life span were all repeated hearsay and there was no research showing this so it was deemed BS.

Now I provide the proof that storing at 100% soc has more than double the reduction in lifespan. Hard evidence from actual scientific experiments.

So what do we get? A “oh okay, I was wrong”? No of course not, it’s not important and everyone is right

Well I long posted before you that the storage thing was in fact correct in that 100% does reduce capacity. OH MY GOD IT DOUBLED AND CHANGED 2%! Did YOU say "Well that doesn't seem much at all!" No you doubled down etc. and now expect a.. kissing for posting the same thing.


Personally all I feel this really shows is I was right and people were parroting marketing BS. Who worries about a 2% battery loss in the real boating world?

[sailorboy1]

Originally Posted by hzcruiser

Thanks for your first hand experiences! And BTW, you mentioned that you charge the LFPs to 14.1V which is not 100% SOC and hence you should be just fine either way.

Pretty sure it if you hold the 14.1 long enough it will be 100%. If long enough I bet 13.8 gets to 100%. But if it is only 99% what difference does it make?

I do charge to 14.4 once in a while. I doubt it makes any difference and is just old misplaced acid battery training bouncing around in my head.

[s/v Jedi]

Originally Posted by sailorboy1

Well I long posted before you that the storage thing was in fact correct in that 100% does reduce capacity. OH MY GOD IT DOUBLED AND CHANGED 2%! Did YOU say "Well that doesn't seem much at all!" No you doubled down etc. and now expect a.. kissing for posting the same thing.

Personally all I feel this really shows is I was right and people were parroting marketing BS. Who worries about a 2% battery loss in the real boating world?

Really? Your memory is letting you down. I have attached your post to refresh your memory… it’s not even from a week ago.

If you could read the PDF, then you would see it is a 4.7% degradation in 6 months so that’s a bit more isn’t it? It's also 2.5% more than when you store them at low soc. For 12 months you’re looking at 9.4% degradation.

[Wandering1]

Yep, some people just choose to ignore that facts they don't like��

[sailorboy1]

there are facts and there are facts. then there are facts of posting what I said where I already said it was a fact, but which apparently wasn't fact enough that it needed to be refacted

there are there facts that are mostly unimportant, there are facts only used to "prove" someone was right, even if the fact was meaningless

In the end I asked if there was support to the "don't store at 100%", which was really a question of use of keeping a battery at a float of 100%. I never said I didn't believe it, I just wanted the facts. Everyone jumped right in with parroting the internet forum answer of how bad it was. But they didn't know the FACTS till I pressed.

Turns out the facts suggest it isn't much a issue with a delta (a change, a difference) of 2-3% depending on which of the 2 only FACTS that have been posted. If that is an issue to you go ahead and maintain your LFPs at 30% and save the capacity.

I really have a hard time understanding the effort being made to prove me wrong when all I asked for is FACTS and have nothing to prove right or wrong. Now that the facts show it is minor why is it important to some to make it more? Don't answer I know why.

[rwidman]

By all accounts, your setup and alternator charging is incorrect and will result in reduced performance and shortened life.

The simplest way of adding Lithium batteries to a boat and keeping an AGM or flooded cell starting battery is to have the alternator and shorepower charger hooked up solely to that AGM or flooded cell battery and to charge the lithium house bank with a lithium battery rated DC to DC charger connected from the AGM or flooded cell battery to the lithium bank. This DC to DC charger will provide the proper voltage and charging curve for the lithium batteries.

While what you have done will work, this setup will work better.

[sailorboy1]

kind of out of nowhere

[newhaul]

Originally Posted by sailorboy1

kind of out of nowhere

Kinda Abbott and Costello esque left field

[HeinSdL]

Lithium battery threads remain my favourite threads, sit back and enjoy the ride!

[akopac]

Now I will say this, the same great things could have been written about my last set of FireFly carbon foam acid batteries at this time of use. Those lasted 2.5 years and then died a death that exactly matched partial state of charge problems they were not suppose to have.[/QUOTE]
My Firefly Bank is still going strong. 4.5 years…
Still waiting for a lithium excuse…

[sailorboy1]

Originally Posted by akopac

My Firefly Bank is still going strong. 4.5 years…
Still waiting for a lithium excuse…

It wasn't that I was lookin g for an excuse to replace I would have been happy if the FF had lived to the hype. I see the website works again, but doesn't look the batteries are available. Of course who would get one of them for $500 instead of a LFP for $250?

[rslifkin]

Originally Posted by sailorboy1

It wasn't that I was lookin g for an excuse to replace I would have been happy if the FF had lived to the hype. I see the website works again, but doesn't look the batteries are available. Of course who would get one of them for $500 instead of a LFP for $250?

Agreed, price wise the FFs make no sense at this point. Either the combo of pricing and need points you to some form of AGM, FLA, or Gel, or it makes more sense to go LFP.