It’s simple and straightforward to use. Running (9) 17W lights 120 V AC using an inverter powered by two 105 Amp-hr deep cycle AGM batteries in parallel. Admin lease email your question to tech@batterystuff.com. Solar inverters convert the low voltage DC electricity created by your solar panels to the 120 volts AC electricity used by household appliances. From what I have learnt by reading all of the post that means I have 210ah and a 12 volt battery bank. On a 12vdc converted to 120v a/c., I want to run a water pump, 120v 8 Amp. Sure the charger will charge the battery bank eventually, but I would consider it mostly a maintainer due to the size of the battery pack. I also have a 4 stage converter to keep my batter topped off. But the problem is the starting amps of the pump, which is over 30 amps. The one factor you still need to know is the system voltage, so that you can get the amperage of the load. Using the inverter calculator, indicates ~14.35 Amps DC load and then running the sizing calculator suggests that I need battery capacity of 306 AH 20 hrs. BatteryStuff Tech If you use all three batteries to create a single battery bank, then I would advise against it. For our example, it is above 85 deg. Steve I have a 7" portable tv with a 10watt max power consumption. The inverter system also has some charging system that charges the battery during utility power. What does it mean? Would this be sufficient for my setup? Inverters are rated in watts, and almost all electrical appliances have a corresponding rating. So it seems to me that a 50 AH deep cycle battery like your model UB12500-45977 would be sufficient for my needs. My suspicion is that the .38 amp rating is based on the ballast… If this is the case, how does this affect my battery capacity planning? Once you have you amp figure you can use the calculator. However a larger AH rated pack will weigh more, and I believe that you were trying to keep the weight down. (Note** if you are using Gel batteries in temperatures below 0 deg F but above -60 Deg F, there is no need to check the box.). Are we looking at a starting current demand vs a run wattage rating? If you feel comfortable with that, then the 50 AH would work. This calculator can assist you in figuring out the DC amp draw through an Inverter, so you can accurately size your inverter battery pack. Hey there! BatteryStuff Tech First you have to run your AC amp draw through our Calculator | DC to AC amperage conversion run through an Inverter. Ray Haws I have a 1000 watt inverter I have a 5amp load 115votts. I realise that 10% amp size for the charger is the recommendation. Inverter Calculator | Sizing AC Load in an Electrical System | RVs & Vans, Battery Life Calculator & Comparison Table, 6 Best Diesel Heaters for Campervans & RVs | A Buyer's Guide, electrical calculators for RVs and campervan conversions. Mark See 2/4/13 question from me above in comments. We’ve included a mini calculator above to help you see the amount of battery a fully loaded inverter will use in an hour and how big the solar array would need to be to power just one hour. What is that compared to 200 AH at 20-Hr Rate? There is a health warning on my results. C-rate is used to describe how fast a battery charges and discharges. For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. Which Inverter Do I Need to Run a Microwave? Sizing a solar inverter … For Batteries something in the range of 400ah with 30% duty cyle should give you ~4 hours … you need AGM type battery not your typical car/start or marine style…any others our there agree/disagree? Remember … That is a high draw if you plan on running off a battery for any length of time. You’ll need a complete list of all AC and DC appliances to work out the total solar battery bank. 9 LED 12v lights, A 12Volt Water pump, DC plug/USB Charger/Monitor Combo, and another USB/DC Charger. This inverter calculator will help you correctly size your inverter for the daily load of your AC appliances in your camper. Watt-hours = watts * hours = 250 watts * 5 hours = 1250 watt … BatteryStuff Tech Based off the calculator, and not doing any adjustments for temperature or age it appears you need a battery at least 44 Amp/Hrs. BatteryStuff Tech The draw amount is what we need to calculate with. Calculating the inverter size, and understanding the implications, may help you assess the appliances you actually need in your RV, look for DC alternatives or more efficient devices. The battery size calculator derates the battery … since the difference in amp requirements for the fan is way smaller to the 240amp plus the current from the inverter. The solar battery calculator applies the best practices for using the depth of discharge/DoD/ of different types of solar batteries, thus ensuring the optimal compromise between the size of the battery … I’d apologize, but if you are tired of the analogy, you probably already kno… Battery AH = Ampere Hour Capacity of Battery N = Number of 12 V Batteries needed The efficiency of Battery = Generally it is 0.8, which is the max. (No working engines). The solar array shown would need 4 good hours of sun to replace the battery energy used by the inverter. Full Name Should contain only letters, numbers, and (' - .)! Multiply the reserve minutes rating of the battery by 0.3 to determine the battery approximate Ah rating. There is a significant loss of power when energy going into the lamp is actually being used to run it. Hooking the fan up to a larger battery pack isn’t an issue as long as you get the voltage correct. With that said your best bet would be to average each device into the calculator, and then add it all up at the end. When connecting the inverter to the battery … To estimate the maximum battery current the inverter … Remember you can only take out of the battery what you put in. They probably also know that W or Watts, stands for “power”. If you will use multiple devices at the same time, work out the highest total wattage of the combined appliances and use those to calculate the inverter size needed. Let’s assume that an inverter … I received a message that all my devices are too powerful. This number is rounded to the nearest whole number, and will tell you what battery Amp Hour rating to look for in the selected battery type. I don’t use all my appliances at the same time. BatteryStuff Tech Based on the large load your are pulling I would recommend at minimum a 232 AH AGM Battery for that 20min run time. If so, how does this affect the calculations. How do I know if the appliance is AC or DC? Battery Needed is rounded to nearest whole number, and is rated in AH at a 20 Hour rate. All the gear and no idea!!! Join our new Facebook Group to connect with a growing community of like minded van builders. I want a much bigger inverter than the calculator has worked out. Other DC devices should be rated in amperage. To replace that 84 amps, you’ll need a 1000w solar array with 4 good hours of sun. If the smallest of all your AC devices is so big it needs a bigger inverter than 3000w, consider a less powerful appliance, a DC alternative, or running it on an AC mains circuit when hooked up. Most people of a certain age are familiar with the 100W lightbulb (before your government banned them) or a 1500W hairdryer. A battery with a reserve minutes rating of 166 has an Ah rating of 49.8. I run a small fridge led lights all around and basic charging necessities iPad etc. The aim of the calculation to size the inverter so it can handle the AC devices you will run. I would suggest the Universal 12v 55 AH Deep Cycle Sealed AGM Battery UB12550-45825, as it is the closest to that size at this time. It’s usually a good idea to round up, to help cover inverter inefficiencies, voltage drop and other losses. F, so check the box. The 4×4 drives around enough to keep the batteries topped up most of the time. I received a message that I can’t run all my devices at the same time. Here’s the links to our other calculators: This site uses Akismet to reduce spam. Failing to do so could lead to your inverter not supporting full loads and overheating, which is a potential fire hazard. The first Field to enter information into is labeled “Load Size”. Also I’m looking at 2× 80w solar panels (160w) foldable with a regulator for each can I plug these two panels together (dual Anderson plug) or will the two regulators confuse each other. Emeka Nwokedi Hi, good day, please I have two 12volts/120amp batteries,connected in parallel to my inverter (12volts/1000watts), but I have a rechargeable fan which uses two 12volts/4.5amp batteries connected in series, i want to run the fan/blade directly to the big batteries heads at the same point where the inverter wires join, would it blow the fan? The rating of the battery reduces by approximately 62% if it is discharged in 1 hour. Work through your typical day, considering all the appliances you’ll use along the way. Taking into consideration the power factor value, the 23W CFL will consume 23W of power still, but would draw 0.38A at 120V”. BatteryStuff Tech You don’t want a situation where you are discharging the battery more than 50%. BatteryStuff Tech This calculator is for sizing a 12v lead acid battery to an amp load. BatteryStuff Tech If this is a 12v 10 watt device then you would basically be getting an additional day by going to a 35 AH battery. The calculator, which has helped me a lot, figures I am using all DC 12volt items the entire time which is not the case. and at what AM- HR rating?? The final Field is where the calculator waves its magic wand and tells you what you need. Surge is the maximum power that the inverter can supply, usually for only a short time (usually no longer than a second unless specified in the inverter… Thinking pure sine wave for motor..not sure. David Deane I have a question. If you know how much power your application takes to run, and the time you would like to run it, we'll recommend a 12 volt battery with a safe amount of AH (Amp Hours) that will give you the runtime you need. This calculator forms part of our camper solar setup series and the wider subject of campervan electrics. What shall I do? We respect your rights to privacy and will not share your email information with anyone ever. Determining the Size of your Inverter Step 1. Posted on Last updated: November 29, 2020 Categories Camper van conversion guide, Home » Camper van conversion guide » Inverter Calculator | Sizing AC Load in an Electrical System | RVs & Vans. However I can tell you that most of our customer that dry camp a lot generally start with a pair of 6 volt deep cycles seen here: RV 6 Volt Batteries. BatteryStuff Tech If you plug in the numbers in the calculator it will tell you. Smaller sized inverters generally come with a short 6 AWG cable which is included with the inverter… For our example we select the AGM Battery. We live & travel full-time in our DIY Sprinter van conversion, Baloo. This post may contain affiliate links, meaning that if you choose to click through and make a purchase, we will receive a small commission at no cost to you. However, when the 2 105 @ 20 hrs batteries in parallel are used, and then put on charge after use, the batteries typically register 50% charged. If you need additional help please contact our TECH Department. Thank you again for the calculator resource. Get this right for your camper lifestyle and you can complete your DIY campervan conversion with confidence. This requires an increase in current flow from the battery to run the inverter and support the load, and results in an increase in the total load requirements. Wondering if we calculated wrong on the front end…. Therefore 10 lights will be 456 Watts total per hour. Maybe give some thought to how you can cut back on your electrical needs. Alex I have a small 12 volt, 2.5 amp cab fan. Would this be accurate? Kindly shed light on my query. 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