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Search took 0.00 seconds. Search: Posts Made By: john61ct
Forum: Our Community 28-11-2017, 11:33
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

AGM are also lead acid.

Yes flooded are better value, but even the best makes also should only be drawn down to 50% in normal usage for longevity.

IMO AGM only when sealed specifically...
Forum: Our Community 25-11-2017, 18:52
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Yes Bruce @ Ocean Planet, a top recommended vendor for system installs (dunno if Maine Sail's doing them these days) himself says

They're really only getting bought by racing yacht owners where...
Forum: Our Community 25-11-2017, 18:48
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

If you're saying you only use under 200AH per day, then get 360AH, those 180's at 8s2p.

They will accept 400+A charge rate at any reasonable SoC, so from Empty (10-15%) to Full (13.8V) in well...
Forum: Our Community 25-11-2017, 18:01
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Sorry 180kg
Forum: Our Community 25-11-2017, 17:59
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

720AH about the same usable capacity, under 400 lbs and also less space
Forum: Our Community 25-11-2017, 17:00
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

#1 is from vendors not publishing charge profiles that maximize longevity. I personally believe Maine Sail & co's hands-on research results will result in 15+ years bank lifetime and possibly double...
Forum: Our Community 25-11-2017, 16:44
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Yes they have, listed in my summary post above.

And yes, they cost thousands, I figure 7x even quality lead. Plus changing to proper adjustable charge sources.
Forum: Our Community 25-11-2017, 13:20
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Trying to keep current LFP-specific discussions here rather than derailing other threads.



No, all that is needed is user-custom setpoints like MC-614.

All gear on the market I've seen...
Forum: Our Community 24-11-2017, 07:26
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

And your vendors will be much happier that they get a repeat customer within ten years, rather than the bank getting passed on in your will.

Obviously LVD and OVD protection is critical.
...
Forum: Our Community 23-11-2017, 14:41
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

> If you log the voltage during charge of a LFP battery, they go linearly up nicely until maybe 13.7V for a 4 cell 12.8V nominal pack. But past there they kick upwards, and go nearly vertical in...
Forum: Our Community 23-11-2017, 14:35
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Active balancing is not only completely unnecessary, but a dangerous violation of KISS.

First thing to do with a packaged "system" is figure out how to disable the cell balancers.
Forum: Our Community 23-11-2017, 14:33
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Yes, boggles my mind someone comes into the one community with actual experts who are getting it right, and starts tossing such harmful misinformation around.

Maybe a shill paid by vendors?

Or...
Forum: Our Community 23-11-2017, 06:24
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Yes, the advice and specs CatNewBee presents in post #54 should be completely ignored, anyone following that advice will be sacrificing many many years of usage, hundreds maybe thousands of cycles.
...
Forum: Our Community 22-11-2017, 16:57
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

That has little to do with the OP topic.

Yes they would be cheaper, but likely FLA not AGM.

And often not available locally, lots of courses get batches delivered by truck.
Forum: Our Community 22-11-2017, 16:17
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

And I doubt the Firefly are an option in Oz anyway, shipping will kill your costs, and they're way backordered keeping up with US demand.

Only caveat is LVD, and one layer only only? 100A...
Forum: Our Community 22-11-2017, 09:28
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Nope sure doesn't.

Takes a rational well-educated population and a political-economic system not completely dominated by the top 1% wealth and business interests.

That then allows public...
Forum: Our Community 22-11-2017, 08:37
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

> drop-in LFP bricks installed in various vessels with internal BMS

I would avoid, for exactly that reason, except as a portable powerpack, camping, day on the beach, etc

> The Wynns have such...
Forum: Our Community 22-11-2017, 08:35
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Links please.

Yes European campervan market is **much** more developed and technically mature.

Maybe more disposable income, I guess universal free education and health insurance help.
Forum: Our Community 22-11-2017, 07:39
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

All that is true.

And?
Forum: Our Community 22-11-2017, 06:54
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

The FF certainly **are** a lot cheaper than LFP, if you agree that only packaged systems including a proprietary BMS are suitable for most boat owners.

Even in a DIY context, you need to account...
Forum: Our Community 21-11-2017, 14:00
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Just based on "informed instinct", likely not even qualify to call true deep cycling.

You should be able to get their tech support to provide a life cycles vs DoD graph.

FLA Trojans and...
Forum: Our Community 21-11-2017, 12:58
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

But who knows how many lifetime cycles lost?

Say in theory they'd last up to 5000 if "coddled" over twenty years, call a big $5000 system $1 per cycle, or $250 a year.

The mfg rates 2000 cycles...
Forum: Our Community 21-11-2017, 11:50
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

It is entirely practical for an owner without special knowledge or a high level of interest to successfully manage a quality packaged $ystem.

You just need to be willing to let the pros who...
Forum: Our Community 21-11-2017, 09:53
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Just for giggles, here's my "boilerplate" LFP summary for RVers, mostly from Maine Sail, excuse any repetition wrt this thread

Any and all feedback is welcome!

____
Bare cells:...
Forum: Our Community 21-11-2017, 09:26
Replies: 91
Views: 18,062
Posted By john61ct
Re: lithium batteries or AGM

Q1 Is that *your* custom-safe definition of 100% (and Q2 what V is that, below 3.5Vpc?) or the cell vendors' at a higher voltage?

Q3 Does that definition, in above regular usage, include holding...
Showing results 1 to 25 of 38
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