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For comparison, lead acid batteries can only discharge 50% of their rated capacity. Battery voltage changes depending on charge and discharge rates. www.renogy.com/content/files/Specifications/BATT-LFP-12-100.pdf. Just so you know, this page contains affiliate links. Note: Some batteries have higher cutoffs, such as 10.6V. Thanks Brian. I set my Solar controller to the setting in the manual (the page in your photo). Once a battery enters sleep mode, it needs to be woken up. Whether Lithium Iron Phosphate (LFP or LiFePo) batteries, AGM, or Flooded Lead Acid, the battery's internal chemistry will determine the voltage status range between full and empty, as well as the depth of discharge (DoD) available for each type. Or, follow them on Facebook, Instagram, and YouTube as Freedom in a Can.. It was when they decided to run their water heater that became the real problem. Usually datasheets specify a constant current of .5C (a recommendation). This morning the battery is at 13.3v. I just installed in my RV a single 300AH Ampere time battery and replaced my converter with a new lithium charge converter. The normal operating range for Lithium Iron Phosphate is 14.4V to 12.9V. I brought it out of storage and measured its voltage with a multimeter. Would like to store energy to cover power outage. Within their first night, they uncovered a disconnect between what they expected and what they got. so `nO"5x7{ C2K'. Good job! Whats with the 14.3 I read about? The Forum has been moved to support.renogy.com. They also display useful system specs such as battery voltage and current. Many LiFePO4 batteries can discharge 100% of their rated capacity every time with no ill effects. <>/Metadata 569 0 R/ViewerPreferences 570 0 R>> One example that really helped us understand the difference between how Lead Acid (blue line) and LiFePo (orange line) discharge is the operation of our 12V vent fan in Hamlet, our 1957 canned ham camper in which weve been living and traveling for 8.5 years. Dont freak at the beep! A batterys voltage drops when connected to a load. It should have instructions for waking up the battery if it has gone into sleep mode. Cons: Must disconnect all loads and chargers and let battery rest. You may think that the battery is dead, but really its just sleeping. Well done, John. And a charge controller is a load. Alex The DC Home App, through the BT-2 Module, is an awesome tool. They left home with a full LiFePo battery (14.2V, 100%) that very shortly became 13.6V, also 100%. So the limit in your battery manual may not be exactly 10V. Copyright 2022 Footprint Hero LLC. I wanted to check its capacity after having stored it for 3 weeks. Click here to remove banner ads from this forum. Will a jump start from a 12 v battery reset it or should I open the battery and disconnect the BMS then reconnect? Of course, this was music to the ears of some Battle Born owners on the forum I was on, Renogy only produces a discharge curve, and not a chart (like Battle Born), so it's difficult to do an apples to apples comparison. Also, it may be helpful to know some brands call the boost stage the absorption stage. Then 30 minutes later, the inverter gave us the low voltage alarm, and everything kicked off. Note: These charts are all for a single battery at 0A. Doing this will help you get your head around what these numbers mean for YOU. I can just use it to check battery capacity.. And do you still have loads connected to the battery? Here are LiFePO4 battery voltage charts showing state of charge based on voltage for 12V, 24V and 48V batteries as well as 3.2V LiFePO4 cells. The battery is already at rest and not connected to anything. Exclusive rewards and exciting adventures all start here Expectations vs. I.e. Note: For more about solar battery chemistry and a full cost-benefit analysis of the 4 most common deep cycle solar batteries, check out our blog from December 2020. That's worse than a lead acid battery, and it doesn't at all match (to my eye) the SOC discharge rate on the Spec sheet. Other appliances that have to have 12V will simply stop operating, like the inverter. Lithium Discharge Rate - 11.4v at 30% SOC?? Nice job on solar systems advice. Hi, I'm Alex. Hardly constant current but does this really worry the battery? Granted, some charge controllers have much more accurate battery voltage readings than others. 3.6 volts for lithium iron phosphate. This voltage reading is inaccurate. Before they knew it, they were at 12.8V and heading toward the low voltage cut-off of their inverter. I believe the manual says that the Charge Voltage is 14.6V and later User 14.6V lithium charger and Recommended Charging Voltage: Between 14.2V to 14.6V. (Dont forget to disconnect your solar panels from your charge controller first!). Plus, LiFePO4 batteries have a relatively flat discharge curve from around 99% to 20% capacity. You can buy individual LiFePO4 battery cells online. (Not to mention that some charge controllers just have flat out wrong voltage readings.). With PV systems, the output from an inverter charger could vary appreciably hence the current presented to the battery would fall (sudden cloud cover etc). 24V lithium iron phosphate batteries are another popular option for solar power projects. The next day they drove to their friend's house, which charged their battery back to 13.2V via their Dual Input DC to DC On-Board Charger and then plugged in to finish charging with their AC to DC charger. Just fixed it! The difference between 70% capacity and 40% is a mere tenth of a volt. Hey Matthew, Ive never had to set a charging voltage beforeyou mean a bulk or absorption voltage? My 200Ah LiFeP04 battery has discharged to 11.5v when shown on Bluetooth BMS screen. When we see our battery status go from 100% to 80% over 2 hours of use, we might expect to have 8 more hours at the same usage rate, but thats not the way deep cycle batteries work, nor how they discharge. 48V is more popular for larger solar systems. I then compared this number to the 12V LiFePO4 state of charge chart above, as well as the one in the battery manual. We cant wait to attend one. This plea for understanding came to us in an email a few weeks ago from some friends who had just taken their (new to them) van out on the road for the very first time. I think hes talking about a 12V LFP battery. Reality: Making Sense of Battery Voltage & Percentages, full cost-benefit analysis of the 4 most common deep cycle solar batteries. The Rover MPPT CC, does have a float state. Looking back at the State of Charge chart above, the battery only dips below 12V below 9% capacity. Agree, it happened to me (LVD) and I simply connected my 12v portable car jumper battery box to the dead Battleborn battery for a bit. What is Boost Time for a LiFePo4 battery ?.should it be zero? Just to make things more complex, battery age, temperature, and whether or not the battery is allowed to rest or has a consistent load on it play a significant role in this as well. All of this info is great, but what we all really want to know is, how long can I run my instant pot, laptop, TV, whatever before I run out of juice? Our best advice is to make some notes about how long it takes your battery bank to drop from 100% to 75% to 50% (or 20% if you have LFP) under normal daily usage. LFP batteries in sleep mode can have very low voltage readings, usually less than 5 volts. Then we used our appliances for a couple of hours, ran the lights, watched a movie, and the battery was at 13.2, which read 90%. Because their app showed 90% when they started the movie (and probably also plugged in a smartphone to charge), they thought they had plenty of power. Ive seen some brands recommend 30 minutes, Ive seen some recommend 0, and in the photo above the brand recommends 120 minutes. It is the upper limit the Controller will allow before calling a fault(I understand this is common practice). Because of these factors, it can be hard to estimate their state of charge from voltage alone. I forget what I had to bring the voltage up to as a minimum before all was normal, but it was not much or a long time. Refer to your battery manual for how to do this. I generally use this voltage reading just to make sure my battery isnt close to being fully discharged. I find it too inconvenient to disconnect everything once the battery is in use. They are fully charged at 3.65 volts and fully discharged at 2.5 volts. If I were to connect a solar panel and start solar charging the battery, its voltage would instantly jump. So, lets return to Sarah & Marks van. The normal operating range is between 12.7V and 12.06V. If you make a purchase after clicking on one, at no extra cost to you I may earn a small commission. Not really. Your email address will not be published. Required fields are marked *. % stream My MPPT charge controller failed and my lifepo4 lithium 100ah battery now reads 3.7 volts. But beware that it can be quite inaccurate. By accurate, I mean to extent possible. But when I connected my battery to an MPPT charge controller, the controller measured 13.0 volts. They are made by connecting eight 3.2V LiFePO4 cells in series. I like this method best for estimating the state of charge of an LFP battery Ive just received or just pulled out of storage. Note: Your battery monitor or smartphone app might give you a slightly different reading depending upon its calibration and the temperature of the battery. A fully charged 12V LiFePO4 battery will have a charging voltage of around 14.6 volts and a resting voltage of around 13.6 volts. Making Sense of Battery Status Percentages. Welcome Guest. The lesson here is not let your battery get that low Hi prizfindr, so what resting voltage does your renogy Li measure as any know SoC? Id check your batterys manual for its recommended settings. But doesnt say what charging voltage I should use, what would you recommend for setting the charging voltage? I got 13.23 volts. So I am not sure how it will ever get to 14.6 unless I set one of those stages to 14.6. But a Lead Acid battery dips below 12V at just under 50% capacity. If you cant, prevent the battery from entering float charge by setting the float voltage to that recommended in the battery manual usually 13.6 volts 0.2 volts. <> Sometime in the middle of the night, our fan just quit running all together, full stop. How is your Amperetime battery holding up? Your email address will not be published. They rarely make sense for small-scale projects. Hello Alex Id look in your batterys manual. endobj Havent had mine for too long either (3-4 months) but so far so good. Ps boost or bulk is 14.6. float is 13.6/8, Hi, Love your charts.. How are you measuring the voltage? You can either buy an off-the-shelf 24V battery or pick up two 12V batteries and connect them in series to make a 24V battery bank. Sometime in the first couple of weeks, we were camping off-grid and running our fan all night long -- it was a warm night. To get an accurate estimate of battery capacity based on voltage, you first need to disconnect any loads and chargers from the battery.