agm battery charge rate
C = 20 hr Rated Capacity (AH)                [ex: 2 strings x S6-460AGM-RE models (415 AH)  = 830 AH rated capacity], I = Charging Current (Amps)                  [charger output min 10% up to max 30% of 20 hr rate]   EXAMPLE:2 strings of S6-460AGM batteries, 20 hr rate = 415 AH x (2 strings) = 830 AH, I =20% of 830 AH = 166 Amps    OR      If the charger output limit is 120 Amps max, then 120 is used, T = 0.38 x 830/166 = 1.9 hrs      OR      T = 0.38 x 830/120 = 2.63 hrs, Did you find it helpful? Is so feel free to donate, support the site and keep it growing. If we again assume that bulk was 100% efficient, and we will for round numbers, the energy returned to the battery at .2C during bulk charging looks like this: If we know the battery had 47.36 Ah left in it, at 49.5% SOC then: 47.36Ah + 26.67 Ah = 74.03 Ah stored in the battery, 74.03 Ah as a % of 95.69 Ah (tested capacity) = 77.4% SOC. Following proper procedure step by step is very important for charging your AGM battery. *DISCLAIMER: This test represents this slightly used AGM and may not be representative of a brand new AGM or a battery with more use and in a worse state of health. Your donations help keep the content coming and also help keep it free. With higher charge currents and multi-stage charge methods, the charge time can be reduced to 8–10 hours; however, without full topping charge. This test was a .2C charge for one hour and then discharged back to 50% SOC, after the 1 hour charge. At .4C the battery attained absorption voltage at approx 63.3% SOC and at a .2C charge rate it attained absorption voltage at approx 77.4% SOC. This battery only saw an approx 12 minute difference in a 5.5hour charge period but yes it did charge “faster” at .4C than it did at .2C. Here the electronic load has turned on and has now begun discharging the battery back down to 50% SOC. This is why many a boater has burned up their alternators charging AGM batteries. The battery is rated at 105Ah so -5.25A was the discharge rate used. The Coulombic efficiency varies through the charge curve and is why getting all lead acid batteries back to 100% SOC, including AGM & GEL, takes a long time. If you’re paying attention this battery, when charged at .4C from 49.3% SOC, stayed in BULK/CC for 19 minutes and entered ABSORPTION/CV charging, where current begins declining, at 63.3% SOC. The charge should be complete. DISCLAIMER: All batteries will test & perform differently based on age, type, chemistry and state of health. The positive terminal should be connected with a parallel way to the other positive side. You bet! Here at 20 minutes, with the voltage now held steady at 14.4V (green CV/constant-voltage light on) we can see that the charge current has already dropped from 42A to 41.5A or a .5A reduction in accepted charge current into the battery. How Odyssey Extreme Battery Made, Safely welding on your RV-DIY project using a 110V Stick welder, How to charge a dead AGM battery: Step by step, How to Charge Optima Battery: Step by step Guideline, What odyssey battery do i need: Advance trick. Check Pricing on Amazon. SCALE IT UP: If we scale this test up, and it should scale well, a .4C charge rate on a 450Ah fairly typical cruising boats house bank would be a continuous 180A. The charge directly charges the right battery. Take for example the .4C charge rate. This battery hit the absorption voltage point at approx 20 minutes when charged at .4C from 50% SOC. It means the charging system is not a conventional technique. Otherwise, the whole procedure will be failed. So, if you buy a smart charger for your AGM battery, then everything will be very easy and simple. Adequate procedures for charging a battery not maintain the battery health but also help in renewing an almost dead battery. At a .4C charge rate it took this fairly healthy, though not perfect, group 31 battery 5:30 to reach 100% SOC from 49.3% SOC. I see lots of burned up alternators when they are under sized for the task. Please read the following instructions before using your battery. AGM charge current should be between 0.10 and 0.15 of the20 hour rate AH rating. He also failed to include for a declining CAR or what is referred to as the charge acceptance rate. Double the charge current to shave 12 minutes? This battery, when charged at .2C from 49.5% SOC, stayed in BULK/CC for 1:16 minutes and entered ABSORPTION/CV charging, where current begins declining, at 77.4% SOC. In bulk this battery had returned energy efficiency of 97.4% yet the last 4% of returned energy, to 100% SOC, takes 3.5 hours! To set the correct time, a simple calculation is used. Are you want to know ACDelco battery review, you can check this article. Click the DONATE button below if you would like to make a donation via PayPal. AGM batteries have a certain charge temperature … ← Charging. Here is another way to look at the charge process with a doubling of charge current. Would you like to see more articles like this? If the battery could stay in bulk for two hours our maximum potential energy into the battery would be 42A. At 1:16 the battery finally attained 14.4V and the current had begun dropping. The steps described above may help you a little bit. Murderous to your marine batteries? At 1 hour the battery voltage has only risen to 13.8V at a .2C charge rate. 1/3 From Left: This is the point where the charge current and voltage flip-flop. At least who have no idea about charging their AGM batteries they got some tips about it. Keep in mind all the necessary tips that make your charging procedure safer and successful. You should also notice that if the battery warms up too much, that indicates something wrong in the battery. I purposely did not test a brand new AGM because that is not at all representative of what we as boaters have in use on-board our vessels for more than a short period of time. How to charge AGM battery: Step by Step Guide, 10 Best AGM Battery of 2020: Read Before You Buy. After completing all the necessary steps, the AGM battery charging procedure will be completed. Learn how your comment data is processed. In the high 90% SOC range we are converting a lot less of the supplied energy into stored energy. If you like it and want to make a small donation than that’s all I ask. Though it is, you should not stop charging the battery anymore. If the connection does not do properly, then the whole procedure will be failed. *For more information on the effects of PSOC cycling AGM batteries please read the May 2015 and August 2015 issues of Practical Sailor Magazine. The battery was then recharged for exactly 2 hours at .2C and then discharged back to 50% SOC and the stored energy for that cycle was measured. I have highlighted the important part for net return amps determining 100% SOC. Last update on 2020-11-02 / Affiliate links / Images from Amazon Product Advertising API, Your email address will not be published. The Bulk charge phase recharges the battery bank to an 80% level. Absorption Time:The most important part of the charge cycle is the Absorption charge. OUCH!!!! But if the battery did not give any reading, then your battery has some major problem in it. The point at which any battery becomes voltage limited or attains the absorption voltage is entirely dependent upon the charge rate you are feeding it. So, it is undoubtedly clear that the range of heat should be in between 0 to 400C. *NOTE: This was not the battery being tested in this article, and it was used. Rather than bore you with multiple images that all look the same I am going to summarize the remaining three tests with the “stored energy” screen shot. Because of its higher charging rates an AGM battery will just about fully charge and at a faster rate from the same type of alternator. I will repeat this, IMPOSSIBLE! is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees If you want to know How to Charge AGM Battery, this article will help you properly. Is so feel free to donate, support the site and keep it growing. If we assume that bulk was 100% efficient, and we will for round numbers, the energy returned to the battery at .4C during bulk charging looks like this: If we know the battery had 47.15 Ah left in it, at 49.3% SOC then: 47.15Ah + 13.44Ah = 60.59 Ah stored in the battery, 60.59 Ah as a % of 95.69 Ah (tested capacity) = 63.3% SOC. 6- 50% SOC Charged at .4C For Exactly 2 Hours. The battery has a rated Ah capacity, at 20 hours, of 105Ah. The chargers are also different. PREFACE: This article looks at the *charging times & achieved state of charge of an AGM battery in multiple scenarios. But for AGM batteries partial charging is not applicable. Here large charger means the capacity of the charger is high and it will capable to charge a large size battery. The battery then underwent one 20 hour discharge capacity test and was then cycled to 50% SOC and back to 100% SOC, 3 times and another 20 hour capacity test was run. Float charging is a further reduction in the constant-voltage limit and an equalization voltage would be an increase in the constant-voltage limit of charging. It will also store energy for future use. It had been used for approx 5 months as part of a bank on a power boat (trawler type) that cruises Maine and resides on a mooring. There are lots of applications like giving backup for UPS, supply power for your electronic devices and cars, etc. For the .4C charging test the timer was reset to 12:00 and an image was snapped using an intervalometer at 2 minute increments. RESULTS: The battery achieved approx 85% SOC in one hour at a .4C charge rate. There is a lot of difference between lithium battery and lead acid battery. At .15C this slightly used AGM took a bit over 6 hours to reach 100% SOC. One wrong step can make your battery unusable. Warming is a sign of charging batteries. NOTE: The ideal float voltage is the lowest voltage setting that will maintain the battery at full charge. It provides the best output for your battery. When 14.4V and 0.525A were attained is when I deemed this battery at 100% SOC. Optima Blue Top D34M Review – Is it worth it? At 4 hours the battery is accepting just 1.6A.. If this was your alternator it had better be robust enough to deliver its full output for at least 1 hour straight. You as a boat owner will have to decide what it’s worth in terms of equipment costs to charge your AGM’s at high charge rates. A charge rate of .2C on a 450Ah bank, a pretty typical bank on a coastal cruiser these days, is an alternator that can deliver 90A continuously, even when hot.


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