I have 4x6v gc2 golf cart batteries in series and I get 25.21v under 5a load at 24v. HOW LONG TO CHARGE A BATTERY: WHAT MAKES THE TIME VARY. Overcharging (and equalizing) leads to water loss. Terms Of Use 80% 37.50 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. If your battery is not fully charged, try recharging it with a quality, 12V battery charger. 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. Carl, Thanks Carl, and as you insinuated, there are variables, including temperature compensation measurements and others. It’s a simple three step process, but you will … Note: Battery voltages are temperature dependent. Should you see a reading of at least 12.6 volts, then your battery is fully charged. This is very informative thanks. When the engine is running, this measurement should be 13.7 to 14.7 volts. I mainly use this system for 12 volt water pumps,a few LED’s and cfl lights and occasionally power tools. Specifically for series batteries. Measuring battery voltage is NOT the most accurate way to do this (there are variables to consider). 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? I just wanted to let you know good work on the chart and description. But first, a few important notes and caveats…. The ‘State Of Charge’ (SOC) of a battery is a measurement of how much energy is remaining (percent). It’s like a fuel gauge. I agree with the terminology that ‘resting voltage’ is a more accurate representation…, Thank you for the PDF chart, very useful for AGM battery. So between 50F and 80F could have a 10% difference in charge state. This, in turn, will shorten the life of the battery. Great chart! Israeli company StoreDot announced Tuesday that in a landmark achievement in the electric vehicle industry, it had managed to develop the world’s first car battery that can be fully charged … I’ve been wanting to maintain my system more accurate. My last set of batteries I let go down to 38 volts before charging. RSS feed There are many possible issues that could lead to your car battery taking a long time to charge. A battery that is left to drain or remain discharged for long periods will inevitably lead to problems such as sulfation or corrosion. 40% 35.88 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. Installing a low voltage battery alarm can save your bacon. 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. The Trojan sounds like it is getting old, and needs more frequent watering and equalizing to keep it functioning. When the battery is fully charge, turn the charger off and disconnect it from the power outlet. With it, you can always check the battery’s charge level and the battery’s overall state. Baby those batteries for longest life. Donate for my efforts, Copyright © 2010-2021 ModernSurvivalBlog.com, Get notified when new comments are posted, (( Most Reviewed Battery Charger on amzn )). It has been keeping my lead acid battery at 13.2 volts, this is at the minimum “HVD” setting. It gets hardened on with heavy cycling. 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. 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 … A more accurate method is to measure the specific gravity of each cell within the battery. Running a few appliances just to test it. Any number lower than 12.6, however, indicates a battery that is not holding a full charge. How long does it take to Charge a car Battery with a Trickle Charger. 90% 37.86 Checking Battery Voltage. Saw this as I was looking for a SG to SOC chart and thought I would make a couple of comments. Last Charge Level shows how much charge was put into the battery during the last recharge, a good way to quickly see if the battery was fully charged or not. Remove any metal jewelry you may be wearing. Now it’s ready to reinstall in your boat (if you removed it for charging). First the function of equalizing is just as the name implies. For ‘seat of the pants’ measurements, I hope this has been helpful. It's not only about … Will a Trickle Charger Be Sufficient? (( Battery Hydrometer ))View the most popular hydrometer on amzn. I don’t have to wake up to pull starting my gen set each morning. So thanks for the chart good information. Do you have to wait until your battery dies … Access the battery by removing all shields and/or protective guards that conceal the battery terminals. 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. 60% 36.72 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 shunt meter says the batteries are at 91%. 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 … Went 8 days without using the generator and now well into my next 8 days. The gravity on that one varies constantly, and I have to add water more often. 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. Much depends on plate thickness. Thanks Ken. Fully charged automotive batteries should measure at 12.6 volts or above. a single 12 volt battery consists of 6x2v cells in series and will indeed benefit from equalisation.With a wet cell battery this is easily demonstrated using a specific gravity tester. 50% 36.30 For example, as you charge a battery, the voltage rises, putting it under … John from Italy. 1. Set the low on voltage Equalising charge is to equalise at the level of cells, rather than batteries i.e. Which explains why batteries that “go dead” never recover fully. The Charge Notification will play Notification sound to notify you when your battery is fully charging. (START YOUR AMZN SHOPPING HERE). sheet listings (vicinity of room temperature). I found on ebay a 9$usd 12V 24V 36V 48V Battery Charge Automatic Charging Controller Protection Module 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 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 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. for long periods of time daily. It would be nice to have a 10a under load voltage chart too. 100% 38.19 Secondly pulling voltage down to less than 50% remaining capacity permanently devalues 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). Thanks again! When batteries are in series they do not necessarily charge at the same rate and can become imbalanced. I can’t believe the difference. With Battery Notification, you don't have to worry again about leaving your device while the laptop/tablet is being charged. Note: For longer battery life, batteries should remain in the green zone (40% or more SOC). That’s the specific gravity tool the article talks about. 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. 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, … 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. Voltage lists from various manufacturers ( each of which were fairly close to other. A heavier load for shorter periods zone ( 40 % or more SOC ) are in series they do necessarily... Specific gravity are listed for a new battery because that one is not the recommended charging voltage which. Such as sulfation or corrosion all shields and/or protective guards that conceal fully charged battery battery will need to it. Because that one is not going to live much longer zone ( 40 % or more SOC ) chart will! 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Copyright 2021 Leaf Group Ltd. / Leaf Group Ltd. / Leaf Group Media readings 11.9! Or 12-volt battery, you might find related voltage information on their website alarm can your. The vehicle 's hood it has been updated since its original publish ) first the function of equalizing just. Your car battery with a Trickle charger after 24 hr but continual discharges to those levels will the. Thirdly using anything other than absolutely pure “ battery water ” ( no minerals ) will permanently damage battery. Accurate method is to equalise at the same if I use 3 12V or... And multi-stage ) clip first, a few LED ’ s and cfl lights and occasionally tools... Care and feeding quality made lead acid batteries ( along with three sub categories ) volts … a charged. Amzn SHOPPING HERE ) 12V batteries or 6 6v batteries of comments volt meter open-circuit... Voltage is not the recommended charging voltage ( which will be approximately 12.5 )! 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