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Search took 0.00 seconds. Search: Posts Made By: tanglewood
Forum: Lithium Power Systems 16-09-2018, 08:49
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Thanks for that description, Delfin.


One question. There has been lots of talk about the hazards of disconnecting the battery (regardless of type) from the alternator while underway. How do...
Forum: Lithium Power Systems 14-09-2018, 15:33
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Google LFP papers. There are dozens and dozens doing all sorts of tests and comparisons over year or more time periods. Lots of really good info, including the details of what happens when SOC is...
Forum: Lithium Power Systems 14-09-2018, 12:47
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

What “above proposal” are you referring to? Several have been discussed.
Forum: Lithium Power Systems 14-09-2018, 12:10
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

I don’t know if this is a hybrid or a non-hybrid, but you asked about backup to LFP, so here goes.

The boat I’m building will have both LFP and LA, but they will never be connected except in an...
Forum: Lithium Power Systems 13-09-2018, 11:33
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Got it. I was thinking of Delfin’s system which is another hybrid variation.
Forum: Lithium Power Systems 13-09-2018, 10:59
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

I see this as one of the big downsides to swapping in an LA battery when the LFP is full. You now have limited power for thrusters, large inverter loads, and inverter features like power assist...
Forum: Lithium Power Systems 13-09-2018, 07:34
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Yes, precisely my point.


A disconnected LFP battery rests at some voltage. No current in, and no current out, because it's disconnected.


Now connect a charger to it that is operating at...
Forum: Lithium Power Systems 13-09-2018, 06:44
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Ah, this links back to the LFP Float discussion. I think the answer is to program your charge controller (this assumes you have or install one for the alternator) to enter it's Float mode, but...
Forum: Lithium Power Systems 11-09-2018, 11:48
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

OK, so it's been a very, very long time since I did this stuff, so I could be remembering incorrectly.... so please tell me where you think I skip the rails....



With a steady state DC current,...
Forum: Lithium Power Systems 11-09-2018, 11:01
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Clamping diodes are pretty common in large relays, but I'm pretty sure their purpose is to prevent welding of the relay contacts. Extinguishing the arc is a real challenge with DC switches, and is...
Forum: Lithium Power Systems 11-09-2018, 10:30
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Thanks!
Forum: Lithium Power Systems 11-09-2018, 10:27
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Hummm, current does play a roll. The magnitude of the magnetic field in the inductor is proportion to the current. So more current means a large magnetic field, and when that field collapses it...
Forum: Lithium Power Systems 11-09-2018, 10:21
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

I think you need to separate out behavior in a correctly operating BMS, from behavior from a broken BMS.


With a correctly operating BMS, all load sources will be shut off before an LVC occurs. ...
Forum: Lithium Power Systems 11-09-2018, 10:06
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Sorry, I can be dense at times over acronyms. What is ICE?
Forum: Lithium Power Systems 11-09-2018, 09:35
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Regarding shutting off high power chargers......


There are typically other ways to shut them off in a graceful way, and I think these approaches are preferred, where possible. The key is having...
Forum: Lithium Power Systems 11-09-2018, 07:27
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

I don't really agree. No harm in trying it yourself, but the paper did a thorough job with a sampling of cells, and exploring paralleling at various different SOC levels. Then recorded and graphed...
Forum: Lithium Power Systems 11-09-2018, 07:19
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

I think the answer is No.


I haven't tried it myself, but have asked Victron exactly this question in the context of Quatros. I was hoping to run two in parallel, hoping a survivor would keep...
Forum: Lithium Power Systems 11-09-2018, 07:13
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Yes, good point. I forgot about that. In fact, somewhere I found a research paper where someone explored the cross-charging currents and the time to achieve balance between cells (he was looking at...
Forum: Lithium Power Systems 11-09-2018, 07:06
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Just read CALB and/or Winston's cell spec sheets. Also the more packaged offerings from Victron, Mastervolt, Lithionics, Relion, etc., some of which I know are built around those cells, and others I...
Forum: Lithium Power Systems 11-09-2018, 06:55
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

My thinking so far is to just parallel the two LFP banks. So the load side of the disconnect relay is tied together. Charging and loads are all common to which ever banks are on line, and the...
Forum: Lithium Power Systems 11-09-2018, 06:22
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

Speaking of dual LFP battery banks for redundancy, I think there is a battery bank sizing consideration.


I've been off reading research papers on the aging effects on LFP of various charging...
Forum: Lithium Power Systems 11-09-2018, 06:10
Replies: 291
Views: 20,810
Posted By tanglewood
Re: LFP FLA hybrid

I think there are only two reasons to have LFP and LA interact in a power system.


One is because you can't sufficiently control the charging sources for proper LFP charging. For example, fixed...
Showing results 1 to 22 of 22

 
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