Or is it fine. 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. I found on ebay a 9$usd 12V 24V 36V 48V Battery Charge Automatic Charging Controller Protection Module See your battery manufacturer recommendations regarding charging. is this for all battery types? My numbers came from averaging the voltage lists from various manufacturers (each of which were fairly close to each other). Baby those batteries for longest life. Put on a pair of heavy-duty gloves and some safety goggles or glasses. Then release the latch on the vehicle's hood. 10% 34.53. RSS feed This means that the battery must NOT be under load and it must NOT be charging. I sent him a link to your chart and told him to call Magnum tech support to learn to tweak the meter. With it, you can always check the battery’s charge level and the battery’s overall state. Very good topic. Generally speaking, the less you discharge the battery before recharge, the longer the battery will last. The battery continues to charge even when the laptop is turned off. The plates may have become heavily sulfated enough that the equalize mode can’t get it all off into solution. The Trojan sounds like it is getting old, and needs more frequent watering and equalizing to keep it functioning. I agree with the terminology that ‘resting voltage’ is a more accurate representation…, Thank you for the PDF chart, very useful for AGM battery. First the function of equalizing is just as the name implies. Features: Battery Notification will notify you when your device battery is done charging or your battery … A battery that is left to drain or remain discharged for … Should you see a reading of at least 12.6 volts, then your battery is fully charged. 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. Measure its voltage with a volt meter while open-circuit, no load (general approximation). Load Test the Battery. Using an efficient alarm system can let you know when the battery charge … 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. No. Went 8 days without using the generator and now well into my next 8 days. 3. This, in turn, will shorten the life of the battery. 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). Also, NEVER combine different types, or age, or widely differing state of charge of your batteries when charging. Which explains why batteries that “go dead” never recover fully. The lower the gravity reading, the lower the charge. Occasional dips into the yellow may not be harmful, but continual discharges to those levels will shorten battery life considerably. Any number lower than 12.6, however, indicates a battery that is not holding a full charge. For really serious work advisable to take temperature of the battery acid for standard lead acid batteries. Ive had when rebuilt 12v it stayed at 12.90 13.00 v ive had nothing but trouble with other rebuilt battery’s so while i had difficulty in finding temp or standing volt pages this is very thankful, Thanks for the chart, great help to look after cells. We stock the best Gocycle, Riese & Muller, Moustache, Haibike, Raleigh & KTM eBikes. Conclusion. I guess my question is do I need to do this since the wally world batteries always seem to be in good shape as per hydrometer readings? The equalizing charge ups the charging voltages in order to get enough voltage to the lesser charged batteries in the series chain. Read the … Barnhouse has driven across the United States numerous times and draws upon his travel experiences in his writing. Voltages and Specific Gravity are listed for a 6-volt or 12-volt battery, and battery banks of 24 and 48 volts. Thirdly using anything other than absolutely pure “battery water” (no minerals) will permanently damage the battery. 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. for long periods of time daily. When performing a load test, you should apply a load to a fully charged battery for no more than 30 seconds and should not see the voltage drop below 9.6V. I realize now I was really punishing them… You will also see a red, positive clip and a black, negative clip. Overcharging (and equalizing) leads to water loss. Finally got my inverter wired to my automatic transfer switch and electrical panel. It’s like a fuel gauge. A discharged battery will have a voltage of about 11.2 volts--but these numbers need to be … StoreDot's electric car batteries can be fully charged in just five minutes Why you can trust Sky News A new electric car battery that can be fully charged in five minutes has … If you know your exact battery, you might find related voltage information on their website. Just thought it might be helpful to add that one tool I’ve found useful is the little floating balls thing for checking individual cell status in lead acid batteries. More is always better. 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 just wanted to let you know good work on the chart and description. (START YOUR AMZN SHOPPING HERE). 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. It gets hardened on with heavy cycling. My last set of batteries I let go down to 38 volts before charging. 30% 35.43 Your State of Charge chart does not show for a 36v system. I have Trojan GEL battery 225Ah when I unplug the charger, it reads 13.2v after 24 hr. Contact Us 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. In fact, good charger systems (alt-energy systems) have temperature compensation built-in. But a good generalization. Note: For best accuracy when measuring battery voltage, the battery must be in ‘open circuit’ condition (at rest, or ‘resting’). Laptop Battery Calibration For Windows: The goal is to run the battery to zero percent, and … When batteries are in series they do not necessarily charge at the same rate and can become imbalanced. 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. Measure the battery’s chemistry (specific gravity) with a hydrometer (accurate method). About Note: For longer battery life, batteries should remain in the green zone (40% or more SOC). Check your car or truck to make certain all electrical accessories and switches have been disabled or turned off. We offer complete battery services for your industrial needs. In other words a heavier load for shorter periods. Come down to our showroom on … Any readings below 11.9 volts … 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. Specifically for series batteries. My shunt meter says the batteries are at 91%. 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. For example, if the temperature is 30 degrees Fahrenheit, the reading will be approximately 12.5 volts. Note: Voltage measurements are only approximate to determine SOC. And want to really take care of these babies. Fully charged automotive batteries should measure at 12.6 volts or above. 6. Be aware that if you are testing your battery in cold weather, the voltage reading of a fully charged battery will be slightly lower. by Ken Jorgustin | Dec 19, 2019 | 27 comments. I mainly use this system for 12 volt water pumps,a few LED’s and cfl lights and occasionally power tools. Great chart! (that’s another story…). John from Italy. That’s the specific gravity tool the article talks about. Measuring battery voltage is NOT the most accurate way to do this (there are variables to consider). It would be nice to have a 10a under load voltage chart too. Most alternative-energy systems are designed to keep the battery bank at least 50% or higher. Running a few appliances just to test it. I wouldn’t stop doing that although it’s a pain, unless you want to lose that battery. Pull the plug at 80 to 90, as going to full 100 percent when using a high-voltage charger can put some strain on the battery. Except with some vigorous efforts at reversal. Never short a battery to fully drain it. Just installed 2 24 volt reconditioned fork lift batteries in my 48 volt system. If it is equipped with a changeable voltage switch, ensure it's set at 12 volts. Advertise … The chart is listed below. 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. 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? 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. 60% 36.72 So between 50F and 80F could have a 10% difference in charge state. Fully Charged is the world's number 1 clean energy & electric vehicle channel. Then allow the car battery to rest, unused, for about 12 hours or overnight and retest. pls, I want to ask… I have a project I’m working on which will run concurrently on battery (12v 200ah deep circle battery). The correct fully charged specific gravity of your 6-volt deep cycle battery is: 1.265 (will vary dependent on battery age, condition and ambient temperature) Battery life is directly related to keeping your batteries fully charged. By short, I mean that you connect the two terminals (positive and negative) directly so that the battery … What is going on here? sheet listings (vicinity of room temperature). There are many possible issues that could lead to your car battery taking a long time to charge. I have heard this is too high of a voltage to keep a battery at! But the chart above will provide a general view for state of charge. 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. The equalizing charge ups the charging voltages in order to get enough voltage to the lesser charged batteries in the series chain. Here are extrapolated numbers for a 36v system. Examine your digital voltmeter. If your battery is not fully charged, try recharging it with a quality, 12V battery charger. Basically, if you charged your laptop to 85% to 90% instead of to 100%, you could improve your battery … 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. The battery will need to be fully charged (above 12.5 volts) before we can perform the second test – Cranking test. I don’t have to wake up to pull starting my gen set each morning. He began writing in 2002 and holds a Bachelor of Arts in English literature from the University of Pittsburgh. With proper care and feeding quality made lead acid batteries not subject to abuse can and will last up to a decade. 90% 37.86 You should probably start saving your shekels for a new battery because that one is not going to live much longer. 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? According to some studies [1], charging a battery to only 85% to 90% can improve its discharge cycle from 300 to even an extra 1000 recharges. Thanks Ken. Terms Of Use Thanks for the PDF, newby to solar power. For example, as you charge a battery, the voltage rises, putting it under … Many battery chargers deliver two to six amps (some allow you to choose the amperage level) and will take at least several hours to recharge a dead car battery. 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. 2. Remove any metal jewelry you may be wearing. Will a Trickle Charger Be Sufficient? If it does, replace … That leads to overcharging of some of the batteries in the set. The batteries are 3 years old costco interstates. HOW LONG TO CHARGE A BATTERY: WHAT MAKES THE TIME VARY. 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. That powers a flat screen TV, charges laptops etc. Note: Battery voltages are temperature dependent. @OJ, Generally speaking, yes. 70% 37.11 Observe the voltage readout on the meter. 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 … With Battery Notification, you don't have to worry again about leaving your device while the laptop/tablet is being charged. Access the battery by removing all shields and/or protective guards that conceal the battery terminals. If the battery tests low once again, in all probability you need to replace it. Just bear in mind the caveats listed above. Equalising charge is to equalise at the level of cells, rather than batteries i.e. Some were slightly different from each-other with regards to their SOC values. I researched as many battery manufacturers that I could find regarding their own published SOC data. 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. Depending on the age of your battery, the capacity and construction of the charger and the charging technique used, it may take a few hours to reach a complete charge. Now it’s ready to reinstall in your boat (if you removed it for charging). Just yesterday a customer called because his inverter shut down at 23 volts, a definite low battery but the SOC meter claimed he was at 81% full. Checking Battery Voltage. I’ve been wanting to maintain my system more accurate. A meter reading of 12.2 volts or 12.0 volts will indicate a charge rate of 50 percent and 25 percent, respectively. (( Battery Hydrometer ))View the most popular hydrometer on amzn. Secondly pulling voltage down to less than 50% remaining capacity permanently devalues the battery. Installing a low voltage battery alarm can save your bacon. A more accurate method is to measure the specific gravity of each cell within the battery. I have combined them a few times, then manually started equalization. It's not only about … This is very informative thanks. It’s a simple three step process, but you will … A fully charged 12-volt battery should have an open-circuit voltage of 12.6 volts. As an Amazon Associate I earn from qualifying purchases. 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. You can use the app to get rid of extra apps that add little to no value to the device’s system and affect battery life. I have 4x6v gc2 golf cart batteries in series and I get 25.21v under 5a load at 24v. A discrepancy of between … Basically, there are two types of lead acid batteries(along with three sub categories). I am using a trace C12 solar charge controller. Connect the positive clip first, followed by the negative. Do you have to wait until your battery dies … Copyright 2021 Leaf Group Ltd. / Leaf Group Media. 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. Your 13.2 reading is quite good. Trickle charges don’t deliver enough juice to charge up a deep cycle battery… Unlike a traditional charger, which can eventually overcharge a battery, a smart charger only delivers as much power as your battery needs – once the battery is fully charged, … The Charge Notification will play Notification sound to notify you when your battery is fully charging. 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. Founded and hosted by Robert Llewellyn (Red Dwarf, Scrapheap Challenge, Carpool). Fully charged voltage A fully charged car battery voltage should be 12.6v or above, this is with the engine off. This is helpful information, thanks for gathering all the data! What is the state of charge of the following specific gravity:1.287, 1.243, 1.128, 1.200, and 1.135 reading from Hydrometer? Do you trust the voltage meter that you’re using for accuracy? You must attach these clips to the corresponding terminals on the battery. It has been keeping my lead acid battery at 13.2 volts, this is at the minimum “HVD” setting. Saw this as I was looking for a SG to SOC chart and thought I would make a couple of comments. 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 … If you notice the battery cannot accept or sustain a full charge, this is a sign that you will need to purchase a new battery in the near future.