I combine the batteries whenever we lose power for more than a few hours so we can run TVs, fans DVD player and lights etc. My shunt meter says the batteries are at 91%. How long does it take to Charge a car Battery with a Trickle Charger. 20% 34.98 Many (most) alt-energy systems incorporate a DC-shunt which keeps track of SOC by monitoring the current flow in and out of the battery or battery bank, which is a very accurate way to track state-of-charge. The charger will then charge less used batteries much like a trickle charger and then switch off automatically when the battery is fully charged and switch on again if the battery charge falls below a certain level. With Battery Notification, you don't have to worry again about leaving your device while the laptop/tablet is being charged. No. The lower the gravity reading, the lower the charge. 2. SUPPORT MSB at no extra cost to you: Advertise Your 13.2 reading is quite good. That matters because the larger a battery is, the more battery-saving tricks there are to extend its life. 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. The battery will need to be fully charged (above 12.5 volts) before we can perform the second test – Cranking test. There are several ways to determine a battery’s SOC. I have 4x6v gc2 golf cart batteries in series and I get 25.21v under 5a load at 24v. I have 4 100 ah sla AGM batteries in series/parallel for 24 volt and warned to make I didn’t discharge them less than 80% is night time my solar charge controller is done for today,so I can’t start charging back up till the AM. A discharged battery will have a voltage of about 11.2 volts--but these numbers need to be … Laptop Battery Calibration For Windows: The goal is to run the battery to zero percent, and … Baby those batteries for longest life. Carl, Thanks Carl, and as you insinuated, there are variables, including temperature compensation measurements and others. A fully charged 12-volt battery should have an open-circuit voltage of 12.6 volts. A meter reading of 12.2 volts or 12.0 volts will indicate a charge rate of 50 percent and 25 percent, respectively. RSS feed Or is it fine. The one thing I would disagree with somewhat from your well written article is concerning the accuracy of state of charge meters. by Ken Jorgustin | Dec 19, 2019 | 27 comments. 50% 36.30 6. Just bear in mind the caveats listed above. … Just installed 2 24 volt reconditioned fork lift batteries in my 48 volt system. 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? Equalising charge is to equalise at the level of cells, rather than batteries i.e. Fully charged voltage A fully charged car battery voltage should be 12.6v or above, this is with the engine off. Your State of Charge chart does not show for a 36v system. Note: Battery voltages are temperature dependent. sheet listings (vicinity of room temperature). Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery, and battery banks of 24 and 48 volts. So thanks for the chart good information. Connect the positive clip first, followed by the negative. With it, you can always check the battery’s charge level and the battery’s overall state. A 12-volt car battery must maintain a full charge not only to start your vehicle, but also to ensure that the battery lasts as long as possible. I just wanted to let you know good work on the chart and description. 80% 37.50 Terms Of Use I sent him a link to your chart and told him to call Magnum tech support to learn to tweak the meter. 1. A fully charged battery will result in a reading between 1.265 and 1.299 of gravity across all cells. The voltage reading of 12.4 volts will indicate that the battery is only 75 percent charged. So between 50F and 80F could have a 10% difference in charge state. 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. My other set up has about 750 watts of poly panels, run through a xantrex 30 amp charge controller charging a trojan 12 volt golf cart battery. When the battery is fully charge, turn the charger off and disconnect it from the power outlet. You should probably start saving your shekels for a new battery because that one is not going to live much longer. Note: The 100% voltage is NOT the recommended charging voltage (which will be higher, and multi-stage). Some were slightly different from each-other with regards to their SOC values. It is set to equalize every 30 days, however sometimes I have to do it more than that, to bring them all back to green. Don’t charge your battery even if it holds on more than 60% charge From the aforementioned methods, it is crystal clear how to charge a deep cycle battery in an authentic way. But please read through the caveats in the article. Great chart! The equalizing charge ups the charging voltages in order to get enough voltage to the lesser charged batteries in the series chain. 70% 37.11 Very good topic. A very highly rated ‘smart’ 12-volt battery charger:(( Most Reviewed Battery Charger on amzn )), Open circuit voltage, or specific gravity per cell, Download full size PDF (Battery State Of Charge). Note: For longer battery life, batteries should remain in the green zone (40% or more SOC). That leads to overcharging of some of the batteries in the set. If the gravity of each cell stays relatively the same (usually all in the green) does that mean that I don’t need to equalize that battery? Founded and hosted by Robert Llewellyn (Red Dwarf, Scrapheap Challenge, Carpool). Remove any metal jewelry you may be wearing. Most alternative-energy systems are designed to keep the battery bank at least 50% or higher. Note: If testing specific gravity (deep-cycle flooded/wet batteries), when drawing a sample from the battery, fill and drain the hydrometer several times first before settling upon a measurement. I’ve been wanting to maintain my system more accurate. 40% 35.88 I then charged my computer fully and VOILA it was fixed and the way I know this is I went to Settings>General>Battery and scroll all the way down and look at TIME SINCE LAST FALL CHARGE and NOW THE STANDBY TIME IS MUCH HIGHER THAN THE USAGE TIME AND THE BATTERY … I wouldn’t stop doing that although it’s a pain, unless you want to lose that battery. Keep the phone battery charge between 30 and 80 … 3. If it does, replace … If the battery tests low once again, in all probability you need to replace it. By short, I mean that you connect the two terminals (positive and negative) directly so that the battery … Will the voltage reading be the same if I use 3 12v batteries or 6 6v batteries? It doesnt help that the manual makes little sense to the layman or that the meter cant read battery voltage and often keeps compounding small errors into bigger ones. Measure the battery’s chemistry (specific gravity) with a hydrometer (accurate method). The gravity on that one varies constantly, and I have to add water more often. Not sure if I understand your question, however I would suggest that if fully charged batteries are just sitting there not being used and they are dropping to 85% in just 2-days, then those batteries are probably end-of-life. 30% 35.43 Your local automotive shop is more than able to load test your battery … Donate for my efforts, Copyright © 2010-2021 ModernSurvivalBlog.com, Get notified when new comments are posted, (( Most Reviewed Battery Charger on amzn )). A discrepancy of between … However for many batteries this is difficult or impossible (AGM batteries, for example). Note: Voltage measurements are only approximate to determine SOC. Should you see a reading of at least 12.6 volts, then your battery is fully charged. Then again, I feel it urgent to bear in your mind that both overcharging and fully draining out of charge is not healthy for the battery. Come down to our showroom on … Load Test the Battery. pls, I want to ask… I have a project I’m working on which will run concurrently on battery (12v 200ah deep circle battery). For example, if the temperature is 30 degrees Fahrenheit, the reading will be approximately 12.5 volts. A 12-volt car battery must maintain a full charge not only to start your vehicle, but also to ensure that the battery lasts as long as possible. Examine your digital voltmeter. My numbers came from averaging the voltage lists from various manufacturers (each of which were fairly close to each other). 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