I sent him a link to your chart and told him to call Magnum tech support to learn to tweak the meter. Terms Of Use Measuring battery voltage is NOT the most accurate way to do this (there are variables to consider). As a battery is charged the indicated voltage increases and, as discharging occurs, the indicated voltage decreases. This is helpful information, thanks for gathering all the data! Sine wave. In a 24 system you have to multiply by two, which gives 27.6V. Will the voltage reading be the same if I use 3 12v batteries or 6 6v batteries? 3.2.1 TBP battery ratings are defined by a series of specifications: 3.2.1.1 The One-Hour Rate This is the rate of discharge (current, A) a battery can endure for one hour with the battery voltage at or above 1.67 volts per cell, which is 10V for a 12V battery or 20V for a 24V battery. What is going on here? The battery life is determined by the Voltage of the pack and the Ah rating of the batteries in the pack. d battery voltage chart, Battery voltage reacts highly to charging and discharging. The One-Hour Capacity, measured in Ampere Hours or Ah, is the Voltage can be used to estimate state of charge but caution must be taken when interpreting voltage readings. The voltage data in the chart below is that of manufacturer spec. So between 50F and 80F could have a 10% difference in charge state. It has been keeping my lead acid battery at 13.2 volts, this is at the minimum “HVD” setting. If if you take a reading while the battery is receiving charge, it could read anything up to 14.5 volts. It’s likely to be somewhere between the 3 and 5 amp mark. Note: Battery voltages are temperature dependent. This works find but what does not work find knowing what I know now, is that the battery bank never reaches not even 70% SOC before it reaches 26V again while solar charging. Equalizing is an overcharge performed on flooded lead acid batteries after they have been fully charged. This is also known as “state of charge”. When batteries are in series they do not necessarily charge at the same rate and can become imbalanced. In fact, good charger systems (alt-energy systems) have temperature compensation built-in. SUPPORT MSB at no extra cost to you: (that’s another story…). System Voltage: Charger Voltage Setting: 12v: 24v: 36v: 48v: Absorption/Bulk Charge: 14.4: 28.8: 43.2: 57.6: Float Charge: 13.5: 27.0: 40.5: 54.0 . Load Crest Factor. Get it by Monday, Jan 4. Only 9 left in stock. The table below shows the voltage and approximate state of charge for each type of battery. If you're reading a residual "surface charge", you should see the voltage drop fairly quickly to ~12.8, the stay there for some time. State of Charge: Sealed or Flooded Lead Acid battery voltage: Gel battery voltage: AGM battery voltage: 100%: 12.70+ 12.85+ 12.80+ 75%: 12.40: 12.65: 12.60: 50%: 12.20: 12.35: 12.30: 25%: 12.00: 12.00: 12.00: 0%: 11.80: 11.80: 11.80 . John from Italy. The plates may have become heavily sulfated enough that the equalize mode can’t get it all off into solution. The above chart gives an indication of what the voltage should be at different states of charge and operating conditions. However, if it only discharges to 50%, the expected number of cycles skyrockets to around 1700! To eliminate these external factors, turn off all loads and disconnect the solar array to allow the battery voltage to stabilize. Note: For longer battery life, batteries should remain in the green zone (40% or more SOC). This means that the battery must NOT be under load and it must NOT be charging. Less than 5 % at full load. Most alternative-energy systems are designed to keep the battery bank at least 50% or higher. RSS feed While on float charge, lead acid measures about 2.25V/cell, higher during normal charge. That said, if you let it rest for 24 hours with no load on it, the voltage reading will give you a pretty good idea. Battery State Of Charge Reference Chart. Yes it will over charge the higher charged batteries, which is why the equalizing charge is only applied for a short time, however if the system uses a single battery equalization is not required and can be detrimental. I built an off-grid system for my home and have expanded and maintained it myself over the years, so that is my knowledge base. I have 4x6v gc2 golf cart batteries in series and I get 25.21v under 5a load at 24v. 12V Car Battery Voltage Chart. I realize now I was really punishing them… 20% 34.98 For example, if charge voltage is noted at 2.5VPC, a 12-volt battery having 6 cells would then require 6 x 2.5VPC or 15V. set the high off voltage, Pulls a relay on and off when it reaches the set points and turns on a mains powered charger to protect over discharge. https://modernsurvivalblog.com/alternative-energy/battery-state-of-charge-chart If you know your exact battery, you might find related voltage information on their website. I mainly use this system for 12 volt water pumps,a few LED’s and cfl lights and occasionally power tools. Equalising charge is to equalise at the level of cells, rather than batteries i.e. 70% 37.11 F. While discharging, a higher temperature will increase battery voltage. (This article has been updated since its original publish). CANADA - Select your location. Otherwise voltage values can fluctuate based on whether the battery is being charged or discharged. Except with some vigorous efforts at reversal. 2. Running a few appliances just to test it. 1. Here is a chart from MK Battery showing different levels of charge for flooded lead-acid and sealed batteries – open circuit voltage. 30% 35.43 Percentage of Charge 12 Volt Battery Voltage Specific Gravity 100 12.70 1.265 The standard meter for years has been the Tri-Metric meter but I finally gave up on using them because they arent very accurate unless fine-tuned beyond the level most homeowners are capable of understanding. This is intended as a guide only as the voltage reading will be effected by the battery age, technology and temperature. I agree with the terminology that ‘resting voltage’ is a more accurate representation…, Thank you for the PDF chart, very useful for AGM battery. It is better to play it cautiously. FREE Delivery on your first order of items shipped by Amazon. | ACN: 632 317 545 | ABN: 41 632 317 545, SOLAR HOTLINE: 1800-EMATTERS (1800 362 883), Sealed or Flooded Lead Acid battery voltage. Most chargers are automatic and pre-programmed. Or is it fine. for long periods of time daily. @OJ, Generally speaking, yes. The average duration a car battery can last is 4 to 5 years or even 3 years in hot climates such as Arizona and Florida. Number of Power Cords. (( Battery Hydrometer ))View the most popular hydrometer on amzn. APC Smart-UPS XL 24V Battery Pack. Full charge voltage on a 12 volt battery is 0.9 volts higher at 32 deg. Thirdly using anything other than absolutely pure “battery water” (no minerals) will permanently damage the battery. The reason I ask is: I have 90 watts of harbor freight panels, run thru a sunsaver controller that charges 2 wally world deep cycle batteries and the gravity has almost never been below the green level, and I never really have had to add much water. victor from NIGERIA, Hi I’m Tommy from Indian wells golf resort in California, i have a fleet of 160, they get used alot in season, now its summer we are slow, i have them in rotation, always have, when a certain section stays in for 2 days the battery percentage on the gps units will be 100%, a day or 2 later drops down to 85 to 80% or lower because they haven’t been used, is that good for the battery? But the chart above will provide a general view for state of charge. I am using a trace C12 solar charge controller. Use our Remote Area Power Supply (RAPS) system calculator to determine your off grid solar energy system requirements and suitable components. This chart suggests that to reach 100% state of charge you need to reach the voltage and specific gravity listed in the chart. I do off grid solar for a living, 25 years now and I sent a customer the link to this chart to give him an extra tool to keep tabs of his system. Just installed 2 24 volt reconditioned fork lift batteries in my 48 volt system. My immediate thought about the differences in your two battery banks is that the wally world batteries are newer, or less heavily used than the Trojan. It gets hardened on with heavy cycling. Most people view the battery voltage as a measure of this. But first, a few important notes and caveats…. SYSTEM VOLTAGE 12V 24V 36V 48V Stop Termination Voltage 14.2V – 14.6V 28.4V - 29.2V 42.6V - 43.8V 56.8V - 58.4V CC-CV Charge Profile – 2 Stage 2-STEP CHARGE DESCRIPTION STEPS DESCRIPTION CHARGE PARAMETERS Step 1 - Charge at a constant current until the battery reaches absorption voltage. The equalizing charge ups the charging voltages in order to get enough voltage to the lesser charged batteries in the series chain. I have combined them a few times, then manually started equalization. Once all load is removed from a battery, voltage can bounce back up substantially. The one thing I would disagree with somewhat from your well written article is concerning the accuracy of state of charge meters. Fully charged 24v lead acid battery voltage? To learn more about the difference between them, view our deep cycle battery guide. You should probably start saving your shekels for a new battery because that one is not going to live much longer. Even the weather can play a role. This relationship between voltage and SOC depends directly on the battery technology used. I put together the following battery state of charge chart which indicates the state-of-charge (percent) as it relates to battery voltage or specific gravity. 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