I'd Like (and probably bunch of guys) for you Techies to go back and read the original post.
LI (lithium) FE (iron) PO4 (phosphate)
The thread: Re: LiFePO4 Batteries: Discussion Thread for Those Using Them as House Banks
has over 2500 posts
For those of us that need to replace our battery
banks in the near future, these batteries seem like the way to go, it seems like we are right on the verge of creating practical guidelines of how to purchase
and install this technology in our boats.
I am starting this thread with the hope that what you are discussing in the related 2500 posts can be summarized for the rest of us.
I am seeing that I can buy 100ah 3.2 volt cells for $130. each Sinopoly 100 Amp Hour Lithium Battery
For the purpose of this discussion, Lets say that I took four of these, hooked them together and installed them in place of my old battery
bank. I am using typical charging
systems for a boat designed to maintain a lead acid battery bank. Would it work? and what are the issues?
The more technical aspects of this subject could go in the other thread but could you guys keep us posted as to what the current
consensus is regarding these installations and what the issues are?
I understand the basic advantages of these batteries, but would somebody please do a brief outline for us (without getting to technical, please)
If you need to debate the technical issues, it should be done on the other thread except for the basics of the disagreement so that we can keep this discussion shorter and more navigable (for the rest of us) (End of Quote)
No where in the past 400 posts has any conclusions been posted. Nothing for the "the rest of us" has been stated that tells us how to set up the LiFePo4
batteries as a house bank or (in my case) a propulsion
bank. If anything this has probably turned off a bunch of people to the LI batteries because you guys have made it seem to far out there for us to install and use.
Now don't get us wrong. Some may love this stuff and I have scratched out a few things that I find interesting but the end result is I'm NOT going to use anything but LiFePo4's in my 144V bank and would REALLY like to know what the installation
, and parameters would be to do this.
The majority of Car DYI guys are using large format LiFePo4's cells to do their conversions. Yes they are trying to get 10C out of their packs and we are probably at around 1C. Even to run a boat at 7 knots I use around 60A at 144V. House banks will be in the 10A range with some at 15A. Not much strain on these batteries.
Correct me if I'm wrong:
batteries need to be strapped together to minimize swelling.
2. In most cases at 12V pacs of 4 in series to create a 12V battery the Parallel to create your bank for the AH.
3. From what I've read Bottom Balance the bats before installation
. Seems to be the way to go and could be a whole subject on its own.
4. In most cases smart chargers can be programed to charge the batteries per the parameters set by the manufacture.
5. In NO CASE do you want to Trickle charge the batteries.
6. Charge to 95% then SHUT THE CHARGER
OFF. No gain (other than a few AH's) and a higher chance of over charging
the pack which is the worst thing that you can do to the bats.
7. Discharge can occur to 95% however it has been shown that the batteries can be brought back from the dead if discharged all the way. (don't try it)
8. To regulate the Over charge/ Over discharge use a relay. Would like to see wiring
diagram of this and further discussion)
9. My understanding is solar
charging and Genset charging is controlled the same way as a charger
would be used. (this is unique to a boat, the DIY guys don't have the room.) So again in this case how do you control the "axillary" charging using these sources, relays? I know that in most cases the Solar Controllers just shut off so this should be a non issue.
10. Some of you guys are stating that mini charge cycles decrease the life of the batteries rather than going from a full (95%) discharge to a full (95%) charge cycle. This is the first time I've ever heard of this. Some conclusions please. Again this is more of a boater thing than a car.
11. BMS (Battery MANAGEMENT System) Again you love them or hate them. In most cases, from what I've read, more fires have been started do to the Management systems then ever the batteries. Highly subjective and very controversial.
12. BMS (Battery MONITORING System) Required and just dumb if you don't have something or totally ignore looking at the batteries every once in a while.
I'm sure there are more questions us laymen would like to know.
I'm sure all of us appreciate the info that can be printed but try and think of this thread as a teacher/student thread, tell us what the answer is. If we want to get technical we can go to the 5000 thread and ask there. You guys can fight over the answer then print the conclusion here.
Steve in Solomons MD