If you need help understanding what the fields mean, please refer to our calculator tutorial. Living in the tropics I get almost 10 hours of strong sunlight. Thanks. BatteryStuff TechThis information is not adequate enough to help you size a system. I want to be using only solar to recharge the batteries. If youre using a 100W solar panel, youd enter the number 100. 50% for a 12 volt system should be 12.2v resting voltage. You may want to consider 600-800 amp hours of capacity, based on this example, depending on your budget and other factors. is it parallel or in series to compensate a 5 hrs full-charging. Your comments please. Note: If you already have a solar panel size in mind and instead want to estimate how long it will take to charge your battery, check out our solar panel charge time calculator. We've included a section below to answer some questions you may have. BatteryStuff TechIm not sure of all the fields you had filled out, but this is how line 29 is determined: Ka8jmwWhats the recovery time in days after the battery bank has been deplete? The pump needs 4-4.2 amps at its current depth. is available for 9 hour. I have a 800 watts, 12V, 200AH inverter system. and how can i calculate or find this?. The internal plates also become covered with lead sulfate, which also hinder further chemical reaction. This is minus any solar panels, which we will figure in a minute. Bearing in mind I need to use an inverter as I cant source an adequate 12v dc pump . If youre using a 400W solar array, youd enter the number 400. You know that each battery is a 12V 100Ah battery. FrawsenHi, Thanks for this calculation tool! You look at the battery specs and see that it has a voltage of 12.8 volts and a capacity of 1280 watt hours. I was wondering how many watt panel might supply an adequate recharge if I strap it to the roof of my FJ as I have latops phones and other sales tools plugged in to the unit. 2. These inverters convert the direct . Lets say youre using a lead acid battery. Using an off-grid solar calculator to determine costs involves a little bit more data entry because your system will also need a charge controller, such as a 3000-watt inverter. Lets say you want to buy a 12V lithium battery to power some 12V LED lights. Im a DIY solar power enthusiast on a journey to learn how to solar power anything. Please provide the following: Amount of draw from the system PER HOUR. I will be operating a 2500/5000w modified sine inverter, with a 140AH battery. For example, if you measured the voltage as 22.1 volts and the resistance of the circuit as 3.2 ohms, divide 22.1 by 3.2 ohms to get 6.91 amps. 2. 20 Batteries wired in series Relates to system voltage number (gives 4.00 for my specifications) I have 4X160AH battery with a 48V 5KVA inverter,l would like to know how many solar panels i need to get and the charge controller? Renogy Solar brings 3 distinct solar panel calculators to help you estimate your power project requirements. I do recommend the results of the calculator. I entered 20 in field #18 [Battery Amp Rating (20)hr]; 5.6 hrs of sun/day (field #22); 70 watt panel and ended up with a total requirement of 1 battery. These predictions help when picking what size solar panel or system to use. Battery MINDer makes the SCC015, a very nice unit that also de-sulfates and restores batteries. Most controllers have about a 15% loss of energy, so the remaining energy goes to the batteries. For a 1 minute cycle * 5 times = 5 minutes = 1/12 hour, 1/12 * 500 = 42 watt hours + 5.5*24 = 174 watt hours. The battery is being nearly depleted on a daily basis. Also, remember that too much current can cause feedback in the battery. Batteries can be wired in series, parallel, or series-parallel. JeremySteve, Yes that is correct. First, the notes: We hope this solar calculator will make sizing your panels and batteries a little less painful. However, since Im filling in it for the first time, I would appreciate to compare and assure that Im doing wright. For this one, your battery and solar panel need to have the same nominal voltage. Note: The second method assumes that your batteries are identical. The only question I have is could take a battery to 50%? Divide solar panel wattage by solar panel voltage, How to Connect a Battery to a Solar Panel. I plan to connect this directly to the panel. Because 1,000 watts is equal to 1 kilowatt, we can also write it as: Peak hours are NOT the hours from sunrise to sunset. I can go weeks to several months without using the boat at times. Only 1 day of back up needed as I will retain the existing AC light. This last method builds on the previous one. V stands for voltage of the battery. 2. What is the optimum wattage for it to run? How to use this calculator? 2. The MPPT calculator has 6 input fields that will describe your solar energy system: 1- Solar panel wattage: This is the watts rating on each of your solar panels. In that case, you'd multiply the fans daily amp hour consumption by the number of days you'll be running it off the battery. The sun shines more intensely at 1pm in Arizona than it does at 8AM in Alaska. The calculator will use this formula to determine the amp hours. I need a battery to support this. (5.5 amps x 5 times a day + .05 amps x 24 hours constant). Enter your battery voltage. BatteryStuff TechTony, what is the system voltage of your solar panels? Any suggestion on cabling size differences, potential power loss and any other consequences? Mikewhat size solar trickle charger would I need for at jeep wrangler. This number is entirely up to you and has no influence on the solar demand. Thanks. For instance, if each of your series strings has 4 batteries in it, youd enter the number 4. CraigI have a hunting cabin and I just need lights. Because lead acid batteries only have 50% usable capacity, a 50Ah LiFePO4 battery has as much usable capacity as a 100Ah lead acid battery. Be realistic. SolarEdge 3-Phase String Inverters & Optimizers, Monocrystalline vs. Polycrystalline Solar Panels, 1.92 kW 6-Panel Heliene Off-Grid Solar System, 4.8 kW 15-Panel Heliene Off-Grid Solar System, 7.68 kW 24-Panel Heliene Off-Grid Solar System, 11.52 kW 36-Panel Heliene Off-Grid Solar System, Requires maintenance - add distilled water and equalize charge on a monthly basis, Enclosure needs to be vented outside to expel built-up hydrogen gas, Enclosure should still be vented, batteries could offgas in certain conditions, Highest efficiency, faster charging, more usable capacity (deeper discharge depth). Say you have a 12V battery and the total peak power from your solar panels is 400 watts. If using a lead acid battery, multiply charge time by 50% to factor in the recommended max depth of discharge of lead acid batteries. The solar panels generate direct current (DC), and battery technology is optimized for DC storage (12v, 24v, 48v). BatteryStuff TechAre you unable to insert these numbers into the calculator for yourself? This way takes into account two important factors that the first method doesnt: battery depth of discharge (DoD) and solar charge controller efficiency. BatteryStuff TechA minimum of 12 volts is assumed as that is in general the lowest system voltage one uses for solar. Abdullah Al Ghayathank you too much about good knowldge . By multiplying a flow rate and a duration, you get a capacity. 3 bulbs will draw a total of 12 amps per hour. The exact math for sizing your battery system is based on your daily power usage and the battery type. x w Solar Panels wired in a s p configuration will result in those Watts being delivered to the charge controller at V when the temperature drops to the low temperature as previously defined.. Once the Charge Controller Converts those V from the solar array down to the ~ V necessary to charge a V battery bank, the charge controller will be putting out A to charge the battery bank. Will this work? SuntamerThanks for your response and looking at my numbers. 5. Well use this number to calculate the length of your parallel strings. :). 2. Notice that the battery bank has the same number of watt hours regardless of whether you wire the batteries in series or parallel. What size solar panel can I get to keep the battery charged when not in use. Im glad it was helpful. For instance, if you're using a 12V battery, you'd enter the number 12. BatteryStuff TechBatteries in parallel is inportant. BatteryStuff TechWe include 16 gauge wire for our panels, up to 127 Watts. For example, lets say your estimated charge time is 8 peak sun hours and your location gets on average 4 peak sun hours per day. This relationship is Ohm's law. . Now, the Jackery Explorer 2000 Plus isn't cheap, coming in at $2,199 (with the $200 Amazon discount), with the combo that includes a PackPlus E2000 Plus battery pack and two SolarSage 200 solar . RESULTS. (22 x12 =264 watts). If you select a battery type, well estimate your batterys usable capacity. Lets say youre using your 100W panel to charge a 12V 50Ah battery. Power, or watt power (Wp), is calculated as Volts x Amps. ChrisExcellent calculator but it doesn't allow for PVs with voltages above 16v. Because a 40 AH battery is being inputted into the formula, your power consumption indicates that you will only be using ~1/3 of the battery capacity. so how to calculate the amperage of charge controller that to be used in the system to charge the battery? If you get 10 hours of direct sunlight, thats still only 13 amps. Amps This calculator is for educational purposes only. Would you agree? If you enter 2 or more, a field will appear asking how your batteries are wired together. BatteryStuff Tech370 Watts will charge a 48 volt system at a rate of 7 amps per hour. The system voltage you enter (line 12) will determine the number in line 30. For some battery types, such as lead acid batteries, you cant use their full capacity without damaging them and shortening their lifespan. This is found by adding up the wattage of the appliances and devices that could be run at the same time. BatteryStuff TechI do not know how much power you need to recharge the batteries. Wil and the rest of the Unbound Solar team are here to answer any questions you have about designing a system that will fit your needs. Didnt even know this was possible. Enter the total solar system size in watts: If you have multiple solar panels connected together, add their rated wattage and enter the total value in watts into the calculator. Back Pain ReliefIm not an expert when it comes to this. Field #18 is based on what battery you choose. May to September in southern Sweden, Scandinavia). 1. Yes we offer 2 volt and 6 volt batteries, however they would be put in parallel to achieve 12 volts at a minimum. Back to the example, if you put 10 AH, line 21 will tell you need 10 batteries. Optional: Select your battery type from the list. Calculate the current in amps flowing through the circuit by dividing the voltage by the resistance. As an Amazon Associate I earn from qualifying purchases. Here are example battery banks for both lead acid and Lithium, based on an off-grid home using 10 kWh per day: Our solar battery bank calculator helps you determine the ideal battery bank size, watts per solar panel, and the suitable solar charge controller. Adeyemi TDear Tech Energy usage is measured in kilowatt hours over a period of time. Can you possibly take a screen shot of the calculator filled out and send it to tech@batterystuff.com? You want a solar panel that will charge your battery in 16 peak sun hours. If one day from 9am to 10am the sun shines with an average intensity of 400 W/m2, then that would be equal to 0.4 peak sun hours. Or you can switch to lower Wattage bulbs, or a combination of all three suggestions. Calculating the amount of energy stored in a battery will use a different formula than a solar battery bank calculator. According to my calculations, the battery bank of 800 AH will give you 6 hours and 24 minutes of uninterrupted runtime when you need the backup power. We do not sell MPPT regulators, and therefore cannot say either way if it is effective or not. Optional: If you select a battery type, well tell you how much. I have read suggestions of 30 feet but I need to go 60 feet. Lets say you have a 12V 100Ah LiFePO4 battery and an MPPT charge controller in your RV. If I need 8amps (2500watts)per hour under full load (1 to 2 hrs daily) for cooking and about 1-2amps for lighting and radio 24/7. The result is a 24V 100Ah battery bank. BatteryStuff TechThank you for the feedback. After 7 days of no sun how many days before the battery bank has been recharged? Solar panel calculators that calculate battery charging time can assist you in understanding production and consumption. (If you have a lead acid battery, keep in mind that they should usually only be discharged 50%.). 6. The last two fields, #22 and #25 are easy. Divide battery capacity in amp hours by solar panel current to get your estimated charge time. Thank you. 3 = 100 (8amps x 12 rounded up) Field #3: This field needs to be DC watt draw only. I just cant get it figured. Once you know the watt hours and the voltage, you can calculate the Ah. Peak sun hours (also called peak sunlight hours or simply sun hours) are a way to measure how much sunlight you can expect to receive at a specific location. If youve selected the series-parallel option, a field will appear asking for the length of your series strings. You input this because the battery you use is up to you and what you decide to purchase. Then choose the type of battery you have or are looking to purchase. Multiply battery watt hours by battery depth of discharge to estimate how much of the batterys capacity has been discharged. This step will help accurately predict the adequate capacity of your battery bank. You can estimate charge time regardless of what state of charge your battery is at. Our rule of thumb is to size your battery bank to have a usable capacity 3 times your daily watt-hour needs. Figuring out how many batteries you need can be daunting. First, the notes: We hope this solar calculator will make sizing your panels and batteries a little less painful. I guess these two go on when the earth closet is in use. multiply the devices current draw in amps by your desired runtime in hours. It takes into account system losses to give you an even more accurate estimate. Formula: battery milliamp hours = battery watt hours battery voltage 1,000, Calculator: Watt Hours to Milliamp Hours Calculator. Select Lead acid if youre using a flooded or sealed (AGM or gel) lead acid battery. Its usually a good idea to round up, to help cover inverter inefficiencies, voltage drop and other losses. Note: Im only using this calculator as a reference for sizing the system so that I have a ball park of what to expect as Im going along in the design and building process. Say you want to use a 55 AH battery because you like the dimensions, or maybe you like the 21 AH battery due to its terminal configuration. Your battery holds only so much Amp/Hrs, so you should be able to come up with some average usage. Calculation is based on the power consumption of the system, voltage, battery type and desired length of backup power required. To get there, use the following formulas; 1 Amp AC = 10 Amps DC. This RV solar calculator will help you correctly size your entire camper solar system. 2. As an Amazon Associate I earn from qualifying purchases. This number may have decimals. Hopefully common sense will tell you otherwise. Multiply battery watt hours by battery depth of discharge to estimate how much of the batterys capacity has been discharged. Join our community! The is the Raw number. All of our battery banks include high quality, UL listed interconnect cables. If line 29 gives you 2.409, the line 31 should be 3. A large solar battery bank size will be best utilized in areas with more cloudy days, while a smaller solar battery bank should be sufficient in areas with prevalent sunlight. On the other hand, if you buy too many batteries, you add unnecessary expense to your system, with extra components, complexity and maintenance. Fields #14 and #18 will determine what size and how many batteries you need. (example, 2AC amps =20DC amp), DC amps x 12v = DC watts. BarryThank you for ths this great calculator. In this case, total amps will be 400/12 which is 33.3 amps. Fields #6 and #12 are for how many hours you expect your equipment to run in a 24 hour period, and your input voltage (12, 24, 36?). They are also NOT the number of hours the sun shines in a day. Wil and the rest of the Unbound Solar team are here to answer any questions you have about designing a system that will fit your needs. For example, lets say you have a 12V 100Ah battery. For instance, if you have a 1200Wh battery, you'd enter the number 1200 and then select "Wh" from the list of unit options. They store power generated from solar panels or the utility grid for use when needed. Optional: If left blank, well use a default value of 50% DoD for lead acid batteries and 100% DoD for lithium batteries. Are my calculations right in that this could be done with a small 30w panel. I am taking mine down to between 20% and 30 %. 4. I wanted to charge the battery with solar since I am in solar sales and I like to walk the walk. To get a very rough estimate of how many amp hours your battery needs to have, you need to know: Once you have the above info, multiply the devices current draw in amps by your desired runtime in hours. I will however see if we can maybe expand the calculator to give people options to dictate which type of batteries they would be putting in parallel or series. Calculator Assumptions. Enter the daily power consumption in Wh and check the other data (change if necessary). Any thoughts on the gauge of connecting wire for this distance. Also I would add the battery voltage as an input and calculate the batteries in series based on that input, right now it assumes 12 volt batteries but your website has 6 volt and even 2 volt available too. Again, you can search the average low temperature for your area online. I have loads electrical capacity of 15,000 watts which is about lambs ,fans and conditioners and fans Laptops and small mills If you have a 50Ah battery, you'd enter the number 50. If you have more than 1, well ask how theyre wired together. At a bare minimum most customers will have have a solar panel that can output two day of power in a single day, and they will often select a battery that can withstand two days without solar and still not be more than 50% discharged. 2- Solar panel open-circuit voltage (Voc): You can find this value in the specification label on the back of your solar panels, or by looking up the specific model. Lithium batteries are more efficient, which means less power is wasted in the charge/discharge process. By measuring the sunlight in peak sun hours, we can quantify how much sunlight a solar panel receives. With that said, here comes the disclaimer. If you have multiple batteries in your battery bank, select how theyre wired together. You would have to check with your batterys manufacturer, but the initial start-up amperage may refer to a discharge rating, not a charging rating. Looking at the figures I would go up to 16AH/day for the inverter.
solar amp calculator with battery
