You should connect the voltmeter to the battery as before but not the charging voltage and this should be done after charging the battery or jump starting the car. The plates may have become heavily sulfated enough that the equalize mode can’t get it all off into solution. After recharging the battery, test it to find out if it is capable of holding a charge. I can’t believe the difference. Clean the surface of the battery with a mix of baking soda and water (or, in a pinch, even just a cup of hot water). Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Track the current flow in and out of the battery with a ‘shunt’ and associated metering circuit (common with alt-energy systems). Therefore if your battery is more than 4 years old and car battery voltage drops quickly, it is possible it has reached the peak of its useful service life and requires replacement especially if it does not hold a charge but it has a normal working charging 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? 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. Do this by use of a hand held electronic battery tester or a conventional load tester. I have never used this service but am extremely pleased with the results. I don’t have to wake up to pull starting my gen set each morning. The meters that you can get that take their info from the inverter or in the case of Midnite Solar from the charge controller are more accurate… Read more », Thanks Carl, and as you insinuated, there are variables, including temperature compensation measurements and others. Installing a low voltage battery alarm can save your bacon. First the function of equalizing is just as the name implies. Then your mechanic may either use a multimeter/voltmeter, or a dedicated battery tester. Some were slightly different from each-other with regards to their SOC values. 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. Toyota Prius - Battery - Bellevue, Washington. I dont call the voltage reading open circuit voltage, I call it “resting voltage” and if done right as you outlined it is seat of the pants but still somewhat accurate. See your battery manufacturer recommendations regarding charging. Thank you for writing in. Visit to register your vote: SUPPORT MSB at no extra cost to you: Reliable test results are given by most electronic testers even if the battery is not fully charged. There are two ways to do this. A voltage value of 12.7 volts and above indicates a 100 percent charged battery. Secondly pulling voltage down to less than 50% remaining capacity permanently devalues the battery. There are many things that can cause a battery to drain even when the car is off. 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. Here are extrapolated numbers for a 36v system. Note: Voltage measurements are only approximate to determine SOC. Jeep Liberty - Battery - Denver, Colorado. Most alternative-energy systems are designed to keep the battery bank at least 50% or higher. A piece of advice to the traveler to Georgia how to take a car for a rent in Tbilisi, a poor wiring connection between the relay and starter or. Resting fully charged 12-volt batteries are around 12.8-12.9 volts, and flat dead ones are at 12.0 volts, so 12.4 volts on a resting battery means it's about 50% charged. 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). But first, a few important notes and caveats…. 3. The appointment was on-time and Scott went above and beyond to install my replacement battery. 11.75-11.89 volts means your battery is dead. I found on ebay a 9$usd 12V 24V 36V 48V Battery Charge Automatic Charging Controller Protection Module The voltage it takes to fully charge a 48V battery pack depends on who manufactured the batteries in … Then the leads are connected to the battery terminals, positive to positive and negative to negative to get the voltage. Your State of Charge chart does not show for a 36v system. Knowing your battery’s voltage range isn’t enough. The problem could be one of the following: You will need a voltmeter for this. If you have voltage readings in the 10.5 volts range on a charged battery, that typically indicates a shorted cell. Note: For longer battery life, batteries should remain in the green zone (40% or more SOC). The batteries are 3 years old costco interstates. A suitable voltage for an AA and Triple-A batteries is something in between 1.1V and 1.5V. Turn on the headlights if they come on with normal brightness it’s possible the no crank problem is not the battery. There is a risk of explosion, and you only get one set of eyes. All rights reserved. Please see our, GMC Terrain - Battery - Charlotte, North Carolina. RSS feed When comparing your car battery’s voltage measurements with the normal battery voltage range for that specific type of battery, you can learn a great deal about the current state of your battery and charging system, how likely it is to fail, and how important it might be to have it replaced. A fully charged car battery has 12.6 volts. This is the method used for non-sealed lead acid batteries. is this for all battery types? You should probably start saving your shekels for a new battery because that one is not going to live much longer. This is the method used for non-sealed lead acid batteries. Then, the voltage of the battery is measured under a load similar to what it takes to start your car. If the battery isn’t fully charged, it will diminish to 12.4V at 75%, 12V when it’s only operating at 25%, and down to 11.9V when it’s completely discharged. Will the voltage reading be the same if I use 3 12v batteries or 6 6v batteries? Repairs covered by 12-month/12,000-mile warranty. You also have to know how to measure your car’s specific voltage at any given time, and be able to compare it with past results to find out whether or not the battery might be dying. Fully-charged, our REDTOPs (including 34M BLUETOP) will read approximately 12.6-12.8 volts and our YELLOWTOPs will read approximately 13.0-13.2 volts (including BLUETOPs with light gray cases). The ‘State Of Charge’ (SOC) of a battery is a measurement of how much energy is remaining (percent). A battery is at full charge when it reaches a certain level the endpoint of 12 volts, but a little more detail may be in order if you want to know play within the voltage ranges. A battery fully charged has a reading of about 12.6 volts. 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. 30% 35.43 So thanks for the chart good information. Measuring your car battery’s voltage can be a great way to determine how charged your battery might be. Before you do this test, YourMechanic will test the car battery to be sure that it has at least a 75% charge. (that’s another story…). 13.5 to 14.5 or more volts at idle should be produced by a charging system that operates normally. The most popular service booked by readers of this article is Car Battery Replacement. A more accurate method is to measure the specific gravity of each cell within the battery. However, if the voltage drops to something below 1.1V is already a dead battery. With this method, a hydrometer measures battery voltage. If you see a buildup of corrosion, not only is it a skin irritant but it's also causing lower voltage. It would be wise to buy a desulfator unit for your batteries in order to reverse sulfation of the plates after long periods of less than 100% charge. In fact, good charger systems (alt-energy systems) have temperature compensation built-in. But first, a few important notes and caveats… Consider your car battery charged at 12.4 volts or higher and discharged at 12.39 volts or less. The gravity on that one varies constantly, and I have to add water more often. A battery is at a discharge anywhere from 11.9 to way below that range. I’ve been wanting to maintain my system more accurate. 40% 35.88 The sealed AGM and Gel-Cell battery voltage (full charged) will be slightly higher in the 12.8 to 12.9 ranges. In case the battery has a reading of 12.4 from the voltmeter, it means it is low (discharged) and should be recharged. Voltage readings that are 10.5 volts and below show that the battery is severely damaged and needs to be replaced. Running a few appliances just to test it. A battery is at twenty-five percent or low voltage at around 12.0 3. This is called the “open-cell” or “resting” voltage of the battery. The test is done with the engine off. Excellent and friendly service. A reading of 1.229 indicates a 75% charge, 1.194 is a 50% charge, and 1.159 is 25% charged. To be somewhat accurate, the battery should be in that condition for an hour or two before taking a measurement, while for a more accurate measurement you should wait 6 hours up to 24 hours. I have 4x6v gc2 golf cart batteries in series and I get 25.21v under 5a load at 24v. If you don’t have a multimeter to tell you the voltage of your battery, you can do a test of your electrical system by starting the car and turning on the headlights. 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. My numbers came from averaging the voltage lists from various manufacturers (each of which were fairly close to each other). If any live wire on the vehicle, there are many, short to ground then they can complete a circuit that will place... From the information provided on your Nissan Sentra, it leads me to believe that your vehicle may have an electrical problem. First you select 12 or 20 voltmeter scale then connect the voltmeter red positive test lead to the battery positive terminal (+) and also the black negative test lead to the battery negative terminal (-). Specifically for series batteries. This test must be done with a true load (carbon pile) and not one of the hand-held testers that work off a conductance algorithm. This test is done twelve hours after shutting off your car, so that any surface charge can dissipate. A fully charged car battery voltage should be 12.6v or above, this is with the engine off. 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. A perfect voltage with the engine running is between 13.7 and 14.7V. The test must be run with the battery in a high state of charge.

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