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Self-discharge rate and SoC @ end of life for solar batteries
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<blockquote data-quote="Bob Smith" data-source="post: 529876" data-attributes="member: 35176"><p>Hello</p><p></p><p>I have learnt in the past few months that you can't really expect to charge your batteries at 100% during summer time and then starting using it in winter when the panels will hardly be able to fully charge the battery on a daily basis.</p><p></p><p>This is because of self-discharge. That is a idled battery will lose its charge no matter what over time.</p><p>I am trying to understand what this over time is</p><p></p><p>I have find in a specs for a battery (here this is Sunsynk)</p><p></p><p>[ATTACH=full]13832[/ATTACH]</p><p></p><p>I understand that the rate of <5% has been measured for a battery charged at 50% (SoC = State of Charge) and at 25°C</p><p>My first question is about the time/duration. How long will it reached 5% discharged? Is it per week, month, year (that would be nice though).</p><p>I also cannot find any diagrams from the batteries specs that would show how the battery discharge based on the temperature or SoC.</p><p></p><p>Also is it actually an important factor when chosing a battery or is it as important as the colour of the cover?</p><p></p><p>Regarding the SoC @ end of line</p><p>[ATTACH=full]13833[/ATTACH]</p><p></p><p>Similar question. I cannot find when that end is (is that 10, 15, 40 years) </p><p></p><p>I noticed that I could not find that self discharging rate nor the SoC @ end of product line on Growatt and Pylontech datasheets. Is that because Sunsynk is more transparent or it is actually useless information?</p><p></p><p></p><p>Thank you in anticipation for making more knowledgable <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Bob Smith, post: 529876, member: 35176"] Hello I have learnt in the past few months that you can't really expect to charge your batteries at 100% during summer time and then starting using it in winter when the panels will hardly be able to fully charge the battery on a daily basis. This is because of self-discharge. That is a idled battery will lose its charge no matter what over time. I am trying to understand what this over time is I have find in a specs for a battery (here this is Sunsynk) [ATTACH type="full" alt="1659269221886.png"]13832[/ATTACH] I understand that the rate of <5% has been measured for a battery charged at 50% (SoC = State of Charge) and at 25°C My first question is about the time/duration. How long will it reached 5% discharged? Is it per week, month, year (that would be nice though). I also cannot find any diagrams from the batteries specs that would show how the battery discharge based on the temperature or SoC. Also is it actually an important factor when chosing a battery or is it as important as the colour of the cover? Regarding the SoC @ end of line [ATTACH type="full"]13833[/ATTACH] Similar question. I cannot find when that end is (is that 10, 15, 40 years) I noticed that I could not find that self discharging rate nor the SoC @ end of product line on Growatt and Pylontech datasheets. Is that because Sunsynk is more transparent or it is actually useless information? Thank you in anticipation for making more knowledgable :) [/QUOTE]
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Self-discharge rate and SoC @ end of life for solar batteries
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