Beginner's Help a Guide to What is an Amp Hour (Ah)? How is Ah Used to Measure Battery Capacity?
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- เผยแพร่เมื่อ 1 มี.ค. 2024
- Over the years I have learned a lot, that I often share on FaceBook. Last year I began writing articles on my website related to RV power systems. I realized though that sometimes people do not understand some of the fundamental concepts with RV power systems.
I made this video for you.
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Many of the articles on my webpage are for the beginner but some are more advanced. Here is a list of what I have written:
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I have 4 LiTime 230Ah batteries, or that is how they label it, but the BMS is only able to supply 200 continuous amps so according to your definition, I have a 200Ah battery? At least that is how I understood your example.
Your capacity should be at or very close to the rated capacity. Also, LiTime is a reputable company so they should definitely be at or very close to the rated capacity. What I am saying in the video (if you have only 1 230Ah battery) is that the concept of Amp Hours says you should be able to deliver 230A for 1 hour or 460 A for 1/2 hour or 115 hour for 2 hours. Being as you have 4 X 230 you could deliver 920A for 1 hour or 460A for 2 hours or 230A for 4 hour. To more directly answer your question. Your LiTime 230A battery has a 200A BMS. This limits each battery to only 200A. (the math still applies but your BMS limit each battery to 200A. So, if you only had 1 battery you could, at maximum deliver 200A but for 1.15 hours not 230 for 1 hour. This is 200A for1 hour and 9 minutes for a 230AH battery with a 200A BMS. However being as you have 4 230 Ah and assuming they are set us a 1S4P you can deliver a max of 800 amp in 1 hour and 9 minutes. If they are in series then the max current would be the maximum of the # of batteries in parallel. For example, if you have a 24V system of 2S2P you would be able to deliver 400A but a 24V. Please let me know if this makes sense. In summary, the BMS does not have anything to do with the battery capacity. One of it's jobs is limiting the current, going both in and out of the battery. The stated capacity is independent of the BMS performance. However. As you add batteries in parallel you can add the current limits of the BMSs. If you tell me you battery set up I can share more.
@@TravelingLightReflections Thank you for the detailed explanation. My batteries are in 4S for my Growatt 5000 ES. But no need to go any further, I get it now. I have 230Ah capacity, I just can't deliver it all in one hour because of the BMS limitation.
@@azycray4801 Yes exactly as you said about the battery's BMS limitation. Your system is 48V with 230 Ah of capacity. The next and better way to describe batteries is to use Watt Hours instead of Amp Hours. Where Amp Hours is good to discuss many aspects of battery usage it does not take the voltage into consideration. Watt Hours does. Watt Hours is the Amp Hours of a battery, multiplies by it's nominal voltage. For example: 230Ah X 12.8V = 2944 Wh. Or in you case, 230Ah X (12.8V X 4) = 11,776 Watt Hours. Another example of this is. someone can say to you, "I also have 230Ah". However if they have a 12V system, you both my have the same Amp Hours but you have 4X the Watt Hours. So... why did I make a video about Amp hours and not Watt Hours? Because understanding Amp Hours is very important and often misunderstood by beginners to battery systems. Also, it still very useful and finally, it needs to be understood before one can understand Watt Hours. I have an article about Watt Hours on my website. It is definitely time for me to make it into a video. www.travelinglightreflections.com/what-is-an-watt-hour-ah
Shouldn’t you be taking into account the voltage of the battery and then calculating the watt-hours, which would indicate how much energy is stored in the battery?
I agree and you are absolutely right watt hours are a much better and precise way to measure energy. However I made this video to be a simple as possible. An understanding of amp-hours is needed to understand watt-hours. I have an article on my website about watt-hours. www.travelinglightreflections.com/what-is-an-watt-hour-ah. I actually have a written version of this video too. Maybe I should make the watt-hour one into a video too. The battery world has slowly moved from Reserve Capacity to Amp Hours and now Watt Hours. Mostly because lithium has a different voltage than lead acid, it is import to compare using watt-hours. However, when we are reading a battery monitor to see the State of Charge (SOC), we use Amp-Hours. Thanks for your comment on this.
Terrible video just going through basic math without explaining anything about what an amp hour means practically
I am surprised and baffled at your response. This video is exactly about explaining what an amp hour is , what it means and its practical use. I made the video to help people understand what an Ah is and how it is used, so if you can tell me what you feel is missing I would love to hear it.