If you need additional help please contact our TECH Department. Mark OK, I‘m just reading the information off the lamp. Most people of a certain age are familiar with the 100W lightbulb (before your government banned them) or a 1500W hairdryer. If the load is DC at 12 volts, then you are looking at about a 200AH battery. The rating of the battery reduces by approximately 62% if it is discharged in 1 hour. However you say that the fan uses two 12v batteries in series, which if it is in series it is a 24v fan not 12v. Use the total wattage, ⦠Make sure to include the most powerful device if it’s bigger than the combined watts of the other appliances. Solar Inverter Sizing. Work through your typical day, considering all the appliances you’ll use along the way. Thus, think of your 100Ah battery as a 50Ah battery ⦠The aim of the calculation to size the inverter so it can handle the AC devices you will run. Maybe give some thought to how you can cut back on your electrical needs. The fourth field is to adjust for the age of the battery being considered. Think of this as the minimum battery bank size based on your typical usage. So it seems to me that a 50 AH deep cycle battery like your model UB12500-45977 would be sufficient for my needs. running 8 hours is a total of 97.92 amps. BatteryStuff Tech If you plug in the numbers in the calculator it will tell you. The calculator shows I would need a 216 AH battery running all items for 6 hours. What should I do? Neeraj Hello, I have 50W DC fan i need to run 24 hours with the 12V battery. I purchased a10ah smart battery charger, it was half the price and I got a bit excited, my question is will this fully charge these batteries eventually? C-rate is used to describe how fast a battery charges and discharges. Why is the minimum size inverter so small? Mark OK How about (9) 17w LED lamps… I do not yet have amps, but it should be significantly lower – trying to get this down to one manageable battery under 100lbs and running 8 hrs, with less than a 10 hour recharge time. Iâm going to use the âhose analogyâ that anyone who has worked with electricity is familiar with. Therefore, each lamp will pull ~4.1 amps each per hour. I received a message that all my devices are too powerful. BatteryStuff Tech Watts/Volts = Amps. and at what AM- HR rating?? This calculator can assist you in figuring out the DC amp draw through an Inverter, so you can accurately size your inverter battery pack. That calculator will tell you how many amps you are pulling out of the battery. The winch sucks 240 amp and would run for 20 min max. Mark See 2/4/13 question from me above in comments. The key is to use the watts you know to calculate the amps at the battery voltage. For a battery recommendation I would at least double this number…so any AGM battery bank rated with 820 Amp Hours or more is my recommendation. Use this as a guide for choosing the proper cable size⦠Hooking the fan up to a larger battery pack isn’t an issue as long as you get the voltage correct. As far as your panels go I would suggest tying them together through one solar charge controller if you are able to, and as long as you don’t exceed that charge controllers rating. Mark up the AC components to calculate the inverter size needed. BatteryStuff Tech 200AH. Welcome to the Trojan Battery Renewable Energy Sizing Calculator. All the gear and no idea!!! Solar inverters convert the low voltage DC electricity created by your solar panels to the 120 volts AC electricity used by household appliances. Please refer to this article for more details. The labels or specification of most appliances state whether it is AC or DC. I realise that 10% amp size for the charger is the recommendation. 456 Watts will pull ~41 amps from a 12v battery source per hour. Need more advice and support on a specific part of your campervan electrics? 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⦠Jeremy JB, if you put in the information into the calculator it will tell you. Would this be accurate? Calculate size of battery bank and inverter. The Load calculator displays the ideal Inverter battery combo for your home or commercial establishments. (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.). thanks My lights I will use only when it is dark and when I am awake, the pump is only when I turn the water on. Get this right for your camper lifestyle and you can complete your DIY campervan conversion with confidence. Select Type of Connection of Batteries in Battery Bank; Select Rating of Each Battery in Battery Bank; Size of Inverter; Size⦠Remember ⦠Is my favourite saying…. We live & travel full-time in our DIY Sprinter van conversion, Baloo. since the difference in amp requirements for the fan is way smaller to the 240amp plus the current from the inverter. If you want your load to run for 5 hours, put 5 as in our example shown here. Given the uncertainty, I would use the highest power rating to make my calculations from (which I did in my previous comment). What size inverter do I need? You may not intend to run all your appliances at the same time, in which case you can ignore this message. This MS Excel spreadsheet calculates the following parameters: Total Demand Load; Size of Battery Bank in Amp.Hr. Inverters are rated in watts, and almost all electrical appliances have a corresponding rating. Sometimes, products list the power usage in current (i.e amps). And it’s just one of our electrical calculators for RVs and campervan conversions too. electrical appliances, devices and components, How to Install Shore Power in a DIY Camper, A Practical Guide to Campervan Ovens & Alternatives, Charging a Leisure Battery Bank | RV Battery Charging, Enter every electrical AC device and component you’ll use in your camper, A further 5 rows are displayed for you to add more devices and another “add more devices” button. So it’s a complete waste to install an oversized inverter for your needs. For our example we select the AGM Battery. Weâve 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. BatteryStuff Tech Unfortunately, I can‘t confirm to you the true power rating of the lamp. The final Field is where the calculator waves its magic wand and tells you what you need. With that said your best bet would be to average each device into the calculator, and then add it all up at the end. This calculator forms part of our camper solar setup series and the wider subject of campervan electrics. figure out the DC amperage using our DC to AC calculator, Calculator | DC to AC amperage conversion run through an Inverter, Calculator | DC to AC Amperage Conversion Run Through an Inverter, Calculator | Determine Run Time for Specific Load, Peukert’s Law | A Nerd’s Attempt to Explain Battery Capacity. How do I know if the appliance is AC or DC? If you use AC appliances when hooked up and they are powered by the battery, you still need an inverter. The total value you get will give you the correct size of inverter. More is needed for flooded batteries. There is a health warning on my results. 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. Running (9) 17W lights 120 V AC using an inverter powered by two 105 Amp-hr deep cycle AGM batteries in parallel. What is that compared to 200 AH at 20-Hr Rate? Any suggestion on getting a better feel for how many AH I need in my Deep Cycle Battery? Wondering if we calculated wrong on the front end…. On a 12vdc converted to 120v a/c., I want to run a water pump, 120v 8 Amp. Are we looking at a starting current demand vs a run wattage rating? I plan on using a 400 watt inverter to power this project..any comments? Alex I have a small 12 volt, 2.5 amp cab fan. Use our Inverter Calculator Tool to help choose the right Go Power! Steve I have a 7" portable tv with a 10watt max power consumption. I have more than 25 devices. As far as moving the charger from battery to battery I simply suggest charging them as a pack, as that is how they are tied together. Inverters can add on average 15% inefficiency to the power draw. the power factor of home standard Note: The inverter capacity is not used in backup time calculation. It is very important to be sure you are using the appropriate cable size for your inverter/battery. I could enter each item separately to get amp hours then total the amp hours at the end. With such variables in frequency of usage how do i figure the battery needed? If you also need a converter (to convert AC power to DC), consider installing a combined RV inverter charger instead. If you expect more or less peak sun hours, adjust the solar panels accordingly. (Note* if you are running AC devices, you will need to figure out the DC amperage using our DC to AC calculator). 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. 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