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Search took 0.00 seconds. Search: Posts Made By: Delfin
Forum: Lithium Power Systems 31-12-2018, 13:33
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

It is not too high for LFP charging unless you expect to set that as bulk and walk away. Before the battery reaches that voltage, the CAR will drop off to near zero and so the charge source can be...
Forum: Lithium Power Systems 31-12-2018, 11:19
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Other ACRs may work differently than mine, but for the Blue Seas I have, you wire the house bank (LFP) to the default destination for charge current. When that bank reaches a fixed setpoint voltage,...
Forum: Lithium Power Systems 28-12-2018, 20:21
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

The BMS doesn't shut off automatically unless a high or low voltage condition exists. It manually disconnects and isolates the bank by a disconnect switch on the BMS. The trigger to disconnect is...
Forum: Lithium Power Systems 28-12-2018, 16:26
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

I do that with the BMS and an ACR. When the LFP is "full", as in CAR < 5% of C, the BMS gets switched off and this isolates the LFP bank from charge sources. I then use a Blue Seas ACR to manually...
Forum: Lithium Power Systems 16-09-2018, 12:28
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

There are two layers of protection. First, yes, when taking the FLA offline via the ACR, I first switch to "manual combine". Second, the Balmar is programmed for a soft ramp so it doesn't kick in...
Forum: Lithium Power Systems 16-09-2018, 08:12
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

I received a PM requesting that I describe our system, as it incorporates an LA battery as a component and it installed as close to a drop in system as I could have hoped for. So here 'tis with all...
Forum: Lithium Power Systems 14-09-2018, 19:38
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Really? A LA battery is about 60% efficient in the taper phase of charging. So, if you have a "very large FLA" bank of oh, say, 1000 Ah, and the taper of the FLA is the last 150 amps, you need 250...
Forum: Lithium Power Systems 14-09-2018, 07:39
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

I believe I suggested, lo these many posts ago, that the size of the LFP bank to do what was expected of it in the envisioned hybrid configuration was a great deal larger than folks were suggesting. ...
Forum: Lithium Power Systems 14-09-2018, 07:34
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

You mean like start the genset?
Forum: Lithium Power Systems 13-09-2018, 19:13
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Given the different busses you have for technical and house loads, that seems like a workable solution. The BMS would provide the LVC and HVC switch noted.

Absent dual busses, I'm still...
Forum: Lithium Power Systems 13-09-2018, 19:07
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

I have hydraulic thrusters, so avoid the big load they would place on the starter bank when I reach the dock after the LFP bank has been taken off line after charging. In my setup, if I had electric...
Forum: Lithium Power Systems 12-09-2018, 10:10
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Nor apparently is learning anything about marine electronics.
Forum: Lithium Power Systems 11-09-2018, 21:34
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

With LFP, when the voltage drops below 13 v with a .1C discharge rate, you are approaching the lower knee. Why on earth would you want to hear motors slowing down, exposing PCBs to damage, as the...
Forum: Lithium Power Systems 11-09-2018, 21:28
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

No, it is not. My impression, from what he has written, is that he does not want to take responsibility for people's systems who don't bother to pay attention to his clear, and empirically derived...
Forum: Lithium Power Systems 11-09-2018, 21:23
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Once again, and for at least the third time, could you provide the data that supports the idea that storing a LFP bank at 10% SoC is rational? You keep posting this recommendation, and I and others...
Forum: Lithium Power Systems 11-09-2018, 16:08
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

The fuel tank analogy is how I describe the LFP mindset to others. Take out some energy, put some back in. Sometimes you put it all back, sometimes not, but the fuel tank doesn't care. The bigger...
Forum: Lithium Power Systems 11-09-2018, 08:37
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

I'm sure you're right about the accountants/weekend boaters, but could we add lawyers to that list? :whistling:

IMO, Lithium probably makes no sense unless you spend a lot of time away from the...
Forum: Lithium Power Systems 11-09-2018, 07:51
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

No John, that is not correct. It may be correct with LA, but not with LFP. When the acceptance rate of an LFP battery drops to near zero, it is full, regardless of the voltage you are charging the...
Forum: Lithium Power Systems 11-09-2018, 07:39
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

On my 300 Ah Lithionics packages, the recommended max discharge rate is 1.3 C continuous and the recommended max charge rate is 1 C continuous. They don't manufacture their own cells, and the specs...
Forum: Lithium Power Systems 11-09-2018, 07:23
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

They don't need to be recharged to 100%, ever. If you want them to be 100%, then you need to charge to 14.6 volts and at that point the BMS will start to shunt current from cells reaching that...
Forum: Lithium Power Systems 11-09-2018, 07:13
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Not so sure about #1 above. My experience is that there is no tail at all for LFP. I've posted this before, but the below illustrates the point. Besides, LFP doesn't have PSoC issues, so even if...
Forum: Lithium Power Systems 10-09-2018, 07:10
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Tend to agree. To use a Lithium battery to top off a LA bank means the Li bank needs to be large enough to provide the last 20% of capacity to the LA batteries, plus house loads during that process....
Forum: Lithium Power Systems 08-09-2018, 09:28
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

Thanks, that helps and I think I am starting to get the picture. Seems like the solution is predicated on using the least expensive wet cells you can get. Just based on my own experience and no...
Forum: Lithium Power Systems 08-09-2018, 07:56
Replies: 291
Views: 20,810
Posted By Delfin
Re: LFP FLA hybrid

I am having trouble understanding the advantages of this arrangement. It seems like a solution in search of a problem, although I guess it has the advantage of reducing the spend on Lithium at the...
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