pianotuna
Regina, SK, Canada
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Hi all,
This is the first chart (stage left graph when looking at the image) I've been able to find that shows voltage under load. I may be reading it wrong.
![[image]](https://www.custommarineproducts.com/uploads/1/4/3/7/1437708/published/lifepo4-discharge-curves_9.png)
* This post was
edited 06/02/22 06:28pm by pianotuna *
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.
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CA Traveler
The Western States
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It’s consistent with other charts I’ve seen.
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Bob
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pianotuna
Regina, SK, Canada
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CA Traveler,
Do those other charts show voltage under load? All the ones I found seemed to just be resting voltage based.
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jaycocreek
Idaho
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It would be interesting to see the difference between different loads and the sag that goes with it..I have looked and looked and can't seem to find the average or exceptable sag with loads applied...I do see some tell others that's too much sag or that's in the ball park,but nothing about what's normal and what isn't...
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BFL13
Victoria, BC
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jaycocreek wrote:It would be interesting to see the difference between different loads and the sag that goes with it..I have looked and looked and can't seem to find the average or exceptable sag with loads applied...I do see some tell others that's too much sag or that's in the ball park,but nothing about what's normal and what isn't...
Never mind the type of battery. You will never see "what's normal" because a large part of it is the R from wiring and connections and not just to do with the batteries themselves as such.
So first do what you can with your own rig besides the battery choice.
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jaycocreek
Idaho
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Quote:Never mind the type of battery. You will never see "what's normal" because a large part of it is the R from wiring and connections and not just to do with the batteries themselves as such.
So first do what you can with your own rig besides the battery choice.
There are a few questions that keep coming up about lifepo4 that appears not to have a definite answer..As you pointed out,the first questions to a poster asking about sag are wiring/connections etc..Assuming that all is in spec,then there is still know real answer..
Of course I would expect a difference in 5-10 amp draw vrs 85-100 amps of a microwave..It just seems there would be some kind of formula/chart that's in the ball park maybe..
I found one chart that list no load/load for different voltages but know mention of load rating..
I'm good with my battery type and connections,just trying to learn as much as possible about LFP,not that it really matters to me other than curiosity..As my Lynx battery tech said..In the end it's just a battery..Enjoy it..LOL
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BFL13
Victoria, BC
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Right! It is what it is, so allow for that so you can recharge the bank tomorrow instead of today, or if needed, do it today so you can go up to the lake for a swim tomorrow. Whatever works for camping priorities!
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BurbMan
Indianapolis, IN
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Any way to make that chart bigger or post a link to it?
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CA Traveler
The Western States
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I'd argue that wiring is more important for flooded batteries due to their significant voltage drop for discharge vs lithium. This results in lower voltage to the devices for flooded batteries.
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CA Traveler
The Western States
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BurbMan wrote:Any way to make that chart bigger or post a link to it? Copy it and increase the image size.
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