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Search took 0.00 seconds. Search: Posts Made By: Dockhead
Forum: Lithium Power Systems 16-09-2018, 06:40
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Well, you are welcome to post about it wherever you like, but I would recommend a new thread as you will get a lot more views that way. This is interesting to a lot more people, than those...
Forum: Lithium Power Systems 16-09-2018, 05:17
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

This thread is about the idea of LFP FLA hybrid in general. I would recommend starting a separate thread about building a home made BMS for lithium, which is a rather different subject and which I...
Forum: Lithium Power Systems 16-09-2018, 04:45
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

No, I was talking about amp/hours in vs. amp/hours stored. I don't have the literature right to hand, but I understand that this ratio approaches infinity at the end of the tail charge. What we...
Forum: Lithium Power Systems 16-09-2018, 04:35
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

If I may echo CatNewBee -- this is a great project, and I hope if you do it, you will start a new thread and post about it day by day. You will get a lot of interest and a lot of good ideas from the...
Forum: Lithium Power Systems 15-09-2018, 03:21
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Reserve bank doesn't even need to be small --


just don't cycle it regularly.



In my case this would be determined by the existing system -- I would leave the house bank as is -- 210...
Forum: Lithium Power Systems 15-09-2018, 03:12
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Yeah, that was exactly my analysis. Except that the tail charge is actually much less efficient than 60% if you do a long low amp absorption charge like lead batteries like, so it's even worse than...
Forum: Lithium Power Systems 14-09-2018, 07:50
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

I know this is an old post in the thread, but the issues raised are worth thinking about again.


The Sterling B2B chargers are brill and I would for sure use one for any charging source which...
Forum: Lithium Power Systems 14-09-2018, 06:29
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

I'm not sure if I agree with you about the "silliness" of hybrid lead-lithium power. Although this issue of charge efficiency during the finish charge has dealt a blow to my thinking about this,...
Forum: Lithium Power Systems 14-09-2018, 05:14
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

OK, so here's a directly relevant question for everyone thinking about hybrid - do we think we NEED emergency backup?

The answer to this may vary according to use case, of course. I was a couple...
Forum: Lithium Power Systems 14-09-2018, 01:12
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

OK, but I don't think that connecting a starting battery into the system is actually a hybrid bank along the lines that the OP and others have been discussing it.


Do you use the starting battery...
Forum: Lithium Power Systems 13-09-2018, 22:22
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

This thread is not about the OP's design. It is about hybrid banks in general.


All the drawings are schematic and not every design feature is shown. Alternator protection -- a trivial issue --...
Forum: Lithium Power Systems 13-09-2018, 22:18
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Borgward is a MUCH better engineered vehicle than a Corvette! :D




I think though that I have come up with the biggest argument of all against any kind of hybrid bank. It's a big one and...
Forum: Lithium Power Systems 13-09-2018, 21:54
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

You are not paying attention. Read back through the thread and you will see that this is discussed in detail.
Forum: Lithium Power Systems 13-09-2018, 11:53
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Sure.


The idea for mine looks something like this:


177322
Forum: Lithium Power Systems 13-09-2018, 11:29
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Good idea!


Et voila:


Sterling "Alternator Lineariser" - Cruisers & Sailing Forums (https://www.cruisersforum.com/forums/showthread.php?p=2720262#post2720262)
Forum: Lithium Power Systems 13-09-2018, 11:22
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Well, my proposal is not to "swap in" the lead bank.


All the heavy loads in my hypothetical installation would be connected to the lithium bank.


But as John observed, once the SOC drops...
Forum: Lithium Power Systems 13-09-2018, 10:42
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Yes, I got that. Thanks.
Forum: Lithium Power Systems 13-09-2018, 10:41
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

You could very well be right.


Yes, the thruster needs up to 350 amps at 24v (and momentarily more than that). The technical bank would be 200 amp/hours to 260 amp/hours (depending on whether or...
Forum: Lithium Power Systems 13-09-2018, 09:11
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Yes, I understood that a while back.




I COULD connect alternator to lead, but then I have to have a second B2B charger with complicated method of switching it around, to charge the lithium. ...
Forum: Lithium Power Systems 13-09-2018, 08:29
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Was this addressed to me?


Besides the windlass, I have a 10 horsepower bow thruster on my technical bank, which does use a bit of power, but you are right that all these loads are used only for...
Forum: Lithium Power Systems 13-09-2018, 07:01
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

OK, but I don't understand your answer -- so there is a voltage at which the charger can support loads but current is not accepted by the cells?




As to drop-in lithium batteries -- I'm...
Forum: Lithium Power Systems 13-09-2018, 04:36
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Yes, of course.


HOWEVER, here's a puzzle for you:


What do you do if you want to stop charging the lithium but you want the alternator online to power ongoing loads?


This is not a...
Forum: Lithium Power Systems 13-09-2018, 04:03
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

You touch on two different issues here --


One is control of charge source, to prevent over-charging.


I don't know who it was that explained it to me, but I found utterly convincing that the...
Forum: Lithium Power Systems 13-09-2018, 04:03
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

You touch on two different issues here --


One is control of charge source, to prevent over-charging.


I don't know who it was that explained it to me, but I found utterly convincing that the...
Forum: Lithium Power Systems 13-09-2018, 03:13
Replies: 291
Views: 20,810
Posted By Dockhead
Re: LFP FLA hybrid

Well, you should read back through this and other threads on the subject. We have gone into all of these issues, and there are some very knowledgeable people providing very useful information.

...
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