Use the total wattage, … Work through your typical day, considering all the appliances you’ll use along the way. 9 of these lights will pull 12.24 amps per hour. It’s simple and straightforward to use. How many amps of batteries do I need, and what size and type of inverter? If you want to size your inverter battery pack, then you first need to figure out the DC amperage you will be pulling out of your battery pack through the inverter. Remember you can only take out of the battery what you put in. 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. Lee. But I need battery power for occasional use for some overhead 12v lights (about 8 although all would not neccessarily be on, which I understand to be about an amp apiece, a toilet macerator which looks to draw about 13 amps when it is engaged, and 2 automatic bilge pumps that come on if there is water in the bilge (I am variously seeing 4-8 amp estimates on water pumps). If you want your load to run for 5 hours, put 5 as in our example shown here. The first Field to enter information into is labeled “Load Size”. For our example, it is above 85 deg. Use this table to decide what size Battery to Inverter Cables and Overcurrent Devices (Fuses & Breakers) to use with your inverter. BatteryStuff Tech 17 watts / 12.5 volts = 1.36 amps. It is very important to be sure you are using the appropriate cable size for your inverter/battery. Inverters are rated in watts, and almost all electrical appliances have a corresponding rating. Thus, think of your 100Ah battery as a 50Ah battery … If, for instance, you are looking for an inverter … All the gear and no idea!!! Luminous has a comprehensive range of inverter and batteries to fulfill your power backup requirement. The next three fields are for selecting what battery type you are going to use. 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. 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. pls Guide Me Number of Batteries Which should i use??? Please refer to this article for more details. well, no.. The battery size calculator derates the battery … Assume 9 lamps, 8 hr run time between charges for simplification. If you only use one device at a time, you need the recommended minimum size inverter. What should I do? and at what AM- HR rating?? Can you explain the discrepancy.. If you only use DC appliances, you don’t need an inverter. BatteryStuff Tech If you plug in the numbers in the calculator it will tell you. 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. BatteryStuff Tech First you have to run your AC amp draw through our Calculator | DC to AC amperage conversion run through an Inverter. The Load calculator displays the ideal Inverter battery combo for your home or commercial establishments. For more info, please check our disclosure page. When using an inverter, the current draw on the battery side can be extremely high, so you may need a battery … Sometimes, products list the power usage in current (i.e amps). By trying to use two on one battery they might interfere with each other, and one might just go to float mode if it sees the battery is at a higher voltage from the charge coming off the other charge controller. Overestimate and you’ll probably spend more money and make your setup more complex than necessary. Then you can use the calculator on this page… I went ahead an found out using the Inverter Calculator that you are pulling 52.90 Amps DC and hour our of the battery pack. Given the uncertainty, I would use the highest power rating to make my calculations from (which I did in my previous comment). The labels or specification of most appliances state whether it is AC or DC. Most people of a certain age are familiar with the 100W lightbulb (before your government banned them) or a 1500W hairdryer. Sizing a solar inverter … David Deane I have a question. Select Type of Connection of Batteries in Battery Bank; Select Rating of Each Battery in Battery Bank; Size of Inverter; Size… The calculator recommend a battery with ~ 200 AH, which is still over 100 lbs of weight. Ray Haws I have a 1000 watt inverter I have a 5amp load 115votts. C-rate of the battery. Here’s the links to our other calculators: This site uses Akismet to reduce spam. You’ll need a complete list of all AC and DC appliances to work out the total solar battery bank. 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. Simply enter the size of the inverter you want. JB my load is 15 Watts LED DC what size of battery for me to run 15watts LED DC for 8hrs? What shall I do? The cable size depends on the distance between battery and inverter, and will be specified in the Owner’s Manual. 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. For our example we select the AGM Battery. How do I know if the appliance is AC or DC? You may want to use multiple AC devices at the same time. The short answer: The ideal size of inverter for your RV depends on the appliances you have in your RV.. The estimated battery bank size and solar array is much bigger than I have space for? 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