Advice needed - Solar System

P924 said:
It is not, where did you get that idea?
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www.solarkobo.com

Battery's C Rating Explained By SolarKobo

A “C” rating is simply a battery’s capacity when discharged over a specific period of time.
www.solarkobo.com www.solarkobo.com

Also

1.4.6 Coulombic efficiency​

In the capacity calibration experiment, the battery released capacity is always less than its charging capacity for the discharge process due to its consumption. The concept of the Coulomb efficiency of the lithium-ion battery is proposed. The Coulomb efficiency is usually used to describe the released battery capacity. It refers to the ratio of the discharge capacity after the full charge and the charging capacity of the same cycle. It is usually a fraction of less than 1. Due to electrolyte decomposition, material aging, ambient temperature, and different charge-discharge current rates, the discharge efficiency of the battery is affected. In the later simulation model, the charge-discharge efficiency is added to compensate and correct the capacity value. Combined with the capacity calibration experiment, the calculation of the Coulomb efficiency in different charge-discharge processes is described as shown in Table 1.5.
Table 1.5. Coulomb efficiency.
Unit 1Unit 2Unit 3
No.Coulomb efficiencyNo.Coulomb efficiencyNo.Coulomb efficiency
10.94210.85910.913
20.92020.91120.943
31.00230.92530.962
Wherein the Coulomb efficiency is a fraction smaller than 1. This is because the internal resistance of the battery itself consumes some electrical discharge energy so that the total electrical energy released by the battery is always less than the total electrical energy charged. Besides, the experiment verified that when the discharging current is larger, the Coulombic efficiency is smaller, and the internal resistance is larger. Therefore, self-consumption is also increased, the discharge power is reduced, and the Coulomb efficiency is reduced. Because the greater the discharging current, the more intense the electrochemical reaction against the battery, and the greater the internal resistance generated, thus the greater the energy consumption of the battery itself.
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Battery Systems Modelling , Cheng, ISBN 9780323904339
 
Speedster said:
To say it's derived from Coulomb's law, is very different from saying it is the same as the Coulomb unit.
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Yep that is what @P924 is pointing out.

But I think enough articles for OP to figure out the essence/benefits of 1C vs 0.5C.
 
Speedster said:
Explain what?

Definition for Coulomb was posted earlier. C-rating of a battery is simply that, C. It's not an abbreviation for anything.
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So nothing to contribute then? Zero? I assumed that you had some pearls of wisdom to share... my bad.
 
RonSwanson said:
So nothing to contribute then? Zero? I assumed that you had some pearls of wisdom to share... my bad.
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Lol. Okay Mr wise guy, go ahead and call the charge/discharge rate Coulomb if it makes you sleep better at night.

Edit: Also, there isn't really any more to contribute. My post sums it up pretty well. Anything more than that is simply fictional and/or erroneous
 
Speedster said:
Lol. Okay Mr wise guy, go ahead and call the charge/discharge rate Coulomb if it makes you sleep better at night.

Edit: Also, there isn't really any more to contribute. My post sums it up pretty well. Anything more than that is simply fictional and/or erroneous
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If you can't explain it, then you don't understand it, which is why your sole contribution is a peanut-gallery type response.

Out of respect for the OP, I am going to leave this thread now.
 
RonSwanson said:
If you can't explain it, then you don't understand it, which is why your sole contribution is a peanut-gallery type response.

Out of respect for the OP, I am going to leave this thread now.
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What can't I explain? It seems you are not comprehending the difference between C rating and Coulomb, both of which have been clearly explained in this thread.
 
The Jam said:
Any others using FreedomWon? I'm super impressed with my 10/8. Discharge capacity is 120A normal use and 300/200 Max for shorter bursts
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A lot of exciting batteries. Even pylontechs have changed since I purchased the 0.5C US3000B model.

Edit even the US3000 is now a 3000C. Interesting changes

www.vpsolar.com

Pylontech new version "C" for US2000 and US3000

Pylontech’s 48V lithium-iron-phosphate batteries with rack size have been updated to the new version US2000-C and US3000-C. The modularity remains unchanged, 2.4 kWh for the US2000-C and 3.55 kWh for
www.vpsolar.com www.vpsolar.com
 
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