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 > LIFePO4 batteries - interesting challenges

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dave17352

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Posted: 07/22/19 04:26pm Link  |  Quote  |  Print  |  Notify Moderator

The new trilliums have a state of charge monitor on the battery themselves.


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LittleBill

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Posted: 07/22/19 04:53pm Link  |  Quote  |  Print  |  Notify Moderator

phemens wrote:

The battery guy gave me what he admitted were conservative numbers for the Samlex since he wasn't too familiar with the unit. I will be bumping up float to 13.6, absorb to 14.4, float exit to 13.6.
Absorb time I assume is time at voltage before cutting out bulk?


float exit should be lower 13.4, are these battleborn battery's?

absorb time should be higher , set it at an hour and go from there.

* This post was edited 07/22/19 04:59pm by LittleBill *





phemens

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Posted: 07/23/19 07:59am Link  |  Quote  |  Print  |  Notify Moderator

They are not Battleborn, it's a manufacturer new in market operating out of Canada. He's an electrical engineer by trade, he spun this business out of another one, started out building them himself and just recently outsourced manufacturing to China. He's been very responsive in helping me get set up.
Samlex recommended 6 minutes for Absorb exit, why would you say 1 hr? The Samlex setting to clarify dictates the time to hold at Absorbtion voltage before stopping bulk charge.

* This post was edited 07/23/19 09:11am by phemens *


2012 Dutchman Denali 324LBS behind a 2006 Ford F-250 V10 out of Montreal
1 DW, 1 DD, 1 DS, 2 HD (Hyper Dogs)
1Kw solar, 500 AH LIFePO4, Yamaha EF2000 gen, Samlex 3000w Inverter

steveh27

Grosse Pointe Woods, MI

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Posted: 07/23/19 08:47am Link  |  Quote  |  Print  |  Notify Moderator

I just installed my 2 Lifepo4 batteries, each 100 ah to give me 200 ah in my very small space battery box in my Class B. They have BMS which I cannot see or change. I have the PD4635 charger and they told me to just keep it in boost mode while charging. I have Trimetric 2025 meter & they gave specs for me to use:
For Lithium LFP batteries, the changes needed are as follows:
P1 - 14.4 Volts.
P2 - 2% of P3 (battery bank capacity)
P3 - Battery Bank capacity in Amp-hrs
P7 - L3
P10 - 98%
P14 - 0.00 hrs

When pugged in all went well with these settings. I now have it unplugged. Probably will not boondock until October 20. That will tell me a lot.

phemens

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Posted: 07/23/19 09:12am Link  |  Quote  |  Print  |  Notify Moderator

I think you'll like your batteries. I just did a test running the microwave, fridge on electric and coffee maker, my voltage dipped all the way down to 13.1V [emoticon]

Itinerant1

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Posted: 07/23/19 09:45am Link  |  Quote  |  Print  |  Notify Moderator

I can see the smile on your face while you did the testing. Roughing it off the beaten trail just got quieter. [emoticon]

steveh27

Grosse Pointe Woods, MI

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Posted: 07/23/19 10:37am Link  |  Quote  |  Print  |  Notify Moderator

My invertor is only 400 watts, so I'll not be having a huge draw, but will have much more usable power. I'll try to attach a pic. It's not pretty, but it's working.

[image]

phemens

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Posted: 07/23/19 11:25am Link  |  Quote  |  Print  |  Notify Moderator

I did try the AC for a few seconds, it started up but the voltage started dropping below 13V, and I think the inverter was signalling an overload (which makes sense as it's 3K).
Read an interesting article on Lithium battery charging with parasitic loads:
Link to article

phemens

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Posted: 07/23/19 02:28pm Link  |  Quote  |  Print  |  Notify Moderator

So, for shore power I think I have it figured out.
Similar but different issue - I have 2 victron MPPTs going directly to battery bank (from different arrays). In bulk charge they work fine, I get to 100% (14.4V). However they then go into standby waiting for the voltage to drop to the threshold to kick back in on bulk charging, which you guessed it is when I'd hit around 20% SOC (12.8V), I don't want to draw that far down.
Any harm in setting float voltage on the MPPTs to something rather high (say 13.5V or even higher?) to keep the batteries topping up during the day. This obviously would not be a problem after sunset, and would give the batteries a chance to draw down overnight. ?

LittleBill

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Posted: 07/23/19 03:02pm Link  |  Quote  |  Print  |  Notify Moderator

the less DODC the better, bring them right to 13.6, doesn't matter the charge source at all.

for the amount of money you dropped, I'm disappointed no one has pointed you in the proper direction when you ordered the stuff, unless you just bought it all yourself.

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