# how long will a 100ah battery run a fridge

), while appliance power consumption is measured in watts (W). For example, the Microwave at 1800W, divided by 12v and adjusted for 85% inverter efficiency, gives 176.5A; but when used for 0.3 hours, how does it come to 2.25 Ah per day? We also use third-party cookies that help us analyze and understand how you use this website. Now let’s get back to Peukert’s Law, where the higher the current being drawn, the lower the ah rating goes. eg 500Ah battery will give you (500*.8)/50 hours total run time. Usually shows 11.5 '- 13. You need a lead-acid battery of 104 Ah to run an efficient top-loading fridge for two days. If your predicted usage is much lower than would be supplied by these larger AGM Deep Cycle batteries, it can be a cheaper option to use a Wet Cell battery. Using a water example, imagine 6 tanks of water (like 6 cells in a battery) each joined together with a straw. Great article to read and easily understandable. Yes, they cost more than Wet Cell batteries, but with correct usage can last twice as long. They can be placed under your bed without risk. Yes you can. Record this voltage and note any voltage drop. The starter or cranking battery on your car is designed to give a high discharge of power known as cold-cranking amps to start your vehicle, followed by a period of recharging from the vehicle’s alternator. It is not too big and not too small either, just right for many situations. (30 x .5 x 8). A slightly different example is a 60 watt fridge running on a 12 volt power source uses 60 /12 = 5 amps, but only while the motor runs. If the efficiency is higher, the battery life will be longer. So figuring out how long a 100ah battery will run a 100W appliance is not as straightforward as it seems. For example this chest fridge used at Thredbo in winter may last 300 hours, but in Darwin in summer only 72 hours if you keep exchanging the beer! 50% of that is 50 Ah, so you could run continuously for 1:20 or so. Taking into account the average small campsite - with a small 45W fridge running for 6 hours, 3 hours of 15W lighting and 20W of other electronic equipment - the minimum consumption to be expected is 335W. Nutted it out - I think. To figure out how long our 12V, 100ah battery will last, follow the steps below. This gives me ample capacity. But....the fridge motor does not need to run all the time, in fact this model indicates it only needs to run about 15% of the time. Excellent article - I wish I'd seen it before I fitted my van out. 1. This fridge can operate over a period of 133 hours, or 5.5 days if the guidelines** are meet. I expected a lot more, maybe at least 3 days seeing that the fridge was never opened. Obviously not a slick solution and the rest of the van would have to use gas for most things. Again it is important to note that the voltage shown will only be accurate if there is at least some load, but definitely not a load exceeding 5% of the batteries capacity. There are a few advanced gauges that will calculate your capacity based on actual recent usage, but the cost is still beyond most recreational users. An effective one we sell is shown below. Still not an auto elect, but I do now know the correct procedure and also the importance of having a good regulator. But if you draw small loads, the discharge rate gets smaller. Great article for a solar novice. Amps x volts = watts. This is a car battery, not a deep-discharge marine battery. At this point I will only be able to run it off a battery (which is not the car battery, it's a separate one) without solar charges etc. But it doesn’t mean the battery will last 100 hours if you draw just one amp per hour, or 50 hours if you draw 2 amps. See also a related article: "Everything you need to know about installing solar panels.". If you have a 12V battery system, then one of the most useful items you can have is a Voltmeter. and normally Im going to use a power tool for about 10-20mins consecutively and then 10-20mins break and then will be used again for about 8-10 times cycles maximum per day. Do the same for the negative terminals of the batteries. Next take a reading where the auxiliary cable goes to the RV battery (or battery charger). The main difference is that the car’s battery is still hooked up to the vehicle itself and you will have the … A low load that is drawing power no faster than the battery can equalise will give a reasonable value for the Charge remaining, by reading the voltage. Cheers. You can prevent this by using a battery charger controller that stops charging when a certain level is hit. Find out which inverter you need. Looking at Figure 1 above you will notice that 12.1 volts AGM, or 12.1 volts for Wet Cell indicates you have used 50% of the capacity of the battery, you should have 50% remaining. Due to inverter inefficiency and energy losses, drawing more than 5 amps an hour reduces the ah capacity rapidly, but drawing less slows the discharge rate. Was recently on a trip where someone had a camper trailer fitted with 2 x 100 AH batteries - plenty of power. The bad news is that if you exceed that discharge rate quoted you will see a significant drop in capacity. I would like to increase my power storage capabilities and thought about adding another 100 amp battery. The answer is not that difficult to find out once you learn the missing variables in this equation. 60 watt fridge ....divided by....12 volt battery....uses 5 amps of electricity (when running). Running a ‘fridge off-grid is hard. When you have finished charging your battery you may get a reading well over 13 volts, however this will be a surface charge and will settle to a real reading of around 13 volts in an AGM battery or 12.6 volts in a Wet Cell battery. With your trusty voltmeter you can check what voltage your alternator is producing by starting your vehicle and connecting your voltmeter to the battery terminals. Therefore a 100ah (amp hour) battery will last for 1000 hours. If you need more than 5 amps per hour you should consider having two or even more batteries. A 12V 100ah battery with a 50% DOD can run a 100W appliance for 10 hours, not 20. These cookies do not store any personal information. 22 to 25) All essential 240V appliances for some softies. The difference between high and low draws, and the battery duration, is significant. Here are some examples all based on 20 Hour run rate: Battery: Load: 60AH 3 Amp 100AH 5 Amp 200AH 10 Amp 500AH 25 Amp Of coarse, you can run your 5 Amp camping fridge on a 60AH battery, BUT (since you are short of 40AH battery capacity) First it will only run for 12 hours or less before the battery is completely flat, and Most battery manufacturers indicate you will get the longest life from a battery by only discharging to 50%. Fixed my leaky toilet cassette completely. The time it takes to equalise is something you will get used to, you certainly don't panic if your voltage drops down while you use the microwave for a couple of minutes (inverters can consume quite a bit of power while in use). I’m planning to install 12v 3000w Inverter with between 100ah-200ah Lithium Battery, directly connecting to the Starter Battery on my car. The batteries consist of 2 x 70A units I set the Waeco on Freeze mode Last night when I got home the unit had already "kicked" out. Thanks x. If you use it for 5 mins a day, it could last 120 days. A fridge drawing only 55 DC amps can be run for about 60 minutes of continuous duty off a 105 ampere-hour battery. Our boat residential fridge runs a much lower duty cycle than our RV absorption fridge (on either electric or propane) because the residential fridge has better insulation. Will a 1000 watt inverter run a refrigerator? Hi, I'm going to buy a Waeco 80 litre (Caravaners Forum-80AC VERB) portable fridge and plan to run it off battery when we are places with no power. Anything in the amps column that exceeds 5 amps will cause your battery to deteriorate very quickly, so I've elected to go for two batteries. 50AH * 12V = 600 watts hours. 1. preset all the 'Watts' columns with 0 (zeroes) and then tailor it to your numbers (either Watts OR Amps) If your fridge is drawing 1amp then the PowerTop’s 135AH battery will be able to run for 67 hours. It is only the inverter extravagances that have taken me over the limit, so for many people a single AGM 100 to 120ah battery will be enough unless you have an upright 12V fridge, or need your TV when away from power. 140 Ah battery has a standard 20H rate of 140/20 = 7, so the capacity at the higher 33.3 A rate would be much lower. I spotted a Parmco 88litre Underbench Fridge/Freezer that really appeals. Or any car fridge for that matter… Did you know that you probably shouldn’t run it from your car’s battery for too long? If you want to reach that 20 hour mark you have to buy a 200ah battery or use two 100ah batteries. 3. Totally lost you there. Mostly its gonna be under 1500w, definitely not over 2000w in total at a time. I have two batteries so does this reading show a combined voltage or am I down on power? A fridge drawing only 55 DC amps can be run for about 60 minutes of continuous duty off a 105 ampere-hour battery. Basic calculation method 135AH battery / 2 = 67.5AH of available capacity (67.5AH / 1amp draw = 67.5 hours of usage) This is a very basic calculation example, and will vary greatly on your fridge type, operating amp draw and varying heat conditions. You can download a blank calculation form and enter your battery size to determine how long it will last. if you want to figure out what your amperage is on the ac side, you would divide by 240, (or really it will probably be 120 here in America because we don't typically run a 240 volt microwave out here ). do i need to disconnect from 12 v system when i wish to use 240 v or do i just turn off inverter? And under these conditions a RV refrigerator alone can run for around 4-5 hours using the 12 V battery supplying around 100 amp hours. I have an inverter and 2 solar panels too. If you fill one end tank using a garden hose or drain the other end using a garden hose it will take some time for all tanks (or cells) to be at equal levels. We are Australia's favourite online shop for caravan accessories. Compressors rely on a steady and clean wave of electricity to perform at their best, and the choppy electricity for a modified sine wave inverter can cause the compressor to overheat and eventually fail. On the website, in your notes to items 22 to 25, you say the Watts need to be divided by 240v to get the Amps/hr. The amount of electricity used to run a device or appliance may be defined as watts or as amps. This rule of thumb allows for greater discharge on occasions, e.g. or 480WH (Watt Hours)/50 (Watts) = 9.6 hours, or 9 hours and 36 minutes. When you look back at Figure 1, you will see that a reduction 0.5 volts pushing a charge into your RV battery can severely reduce the total usable amps until you top it up again. The inverter inefficiency determines how long a battery will last before losing all power. This means that it did not even run for 2 full days. When the amps/h for all devices are added up we find we use around 13.5 amp hours per day. Camping inverters run 230V mains appliances from a leisure battery or other 12V source. Please sign in if you want to add a comment. We can use a voltmeter to get the voltage, and this can be used to get a good approximation. This can be compensated to some extent by increasing the cable x-section but even this has limits. How Many Amp Hours Do You Get From A 100ah Battery? But you appear to have divided by 12v. Just replace the numbers with your own. Necessary cookies are absolutely essential for the website to function properly. A very small user of power is a 1.2 watt LED light running on a 12 volt power source will use It uses too much power. Playing devil's advocate here, I wonder is it worth bothering with all that wiring for light use? RV refrigerators are not meant to run on battery alone for long periods of time, and it depends on your RV model, but exactly how much time you have is going to depend on a number of different factors. Switch off your inverter when not using it - with no load, it will use 50Ah if powered on 24 hours. A 100ah battery should provide 1 amp for 100 hours, 2 amps for 50 hours, 3 amps for 33 hours etc. A fridge drawing only 55 DC amps can be run for about 60 minutes of … This should read from 13.8V to 14.8V. I have 2 new 8v golf cart batteries. Just another bloody good article. By clicking “Accept”, you consent to the use of ALL the cookies. Figure 1: Voltage indicating charge left. Were you able to resolve the issue? Batteries (say 100ah battery) have been tested at a given discharge rate of 20 hours. You're not using the microwave for .3 of the day, only .3 of one hour of the day, so divide 176 by 72. When it comes to running your fridge from your car battery, there’s a right way and a wrong way of doing such a … I would have to buy 2 new batteries for this to be successful, or should I buy 1x145 amp hr or the like when my old battery conks. Figure 3: Less charge due to voltage drop. So, 100 amp-hour battery can provide 5 amps for 20 hours. So I have a pool pump that says its 115V and 12amps....based on what I read...Im guessing Im going to need 2 100ah deep cell batteries instead of just the one I ordered in order to run the pump 8 hours a day? The right product and very fast from Caravans Plus. If I put 0.3 hours usage opposite the Microwave here, I get 52.9Ah per day - which makes more sense to me. Not everyone will benefit from using deep cycle batteries. You use less battery power with a lower draw. You can run a 10A device for a maximum of 10 hours. Doing so will increase the amp hours and run devices for longer periods. This means the battery can provide 480 Watts for 1 hour. The AGM Deep Cycle battery plots closer to straight than the Wet Cell battery. It is connected to a Solar Charge Controller and the empty battery storage area output is 12v. They do use more than you think. They are more like a mini computer taking and recording sample data and making predictions of capacity remaining and how long it will last if you continue to use it at the present rate. As always there is a little explanation required to ensure that we are at the same starting point. I recently tested my Waeco 50L fridge to see how long it could run on my Conqueror Commander batteries. As we pointed out above, we have to account for Peukert’s Law, so the battery might only last 6 hours. Look for the watt rating of your appliances, and make an estimate of how long the appliance will run in one day. Flooded lead acid (FLA) batteries have a maximum 50% depth of discharge, while AGM and gel is between 50%-70% depending on the manufacturer. You need to know a few things first. The life cycle of gel, AGM and other batteries will vary according to the manufacturing design, so these are only estimates. Just one night away from a caravan park will save $30 plus extra weight for ever kilometre you travel. 40AH (Amp Hours)/4.16Amps = 9.6 hours, or 9 hours and 36 minutes. Battery capacity is measured in Ah (amps x hours). Great article but your excel spreadsheet will not work on current version of excel. Home Battery Bank is compensated for referring traffic and business to these companies. The battery will last longer if the draw load will only be a few minutes. First, you cannot use 100% of a battery for anything useful. Yes, you may need to replace your battery a year earlier, but you have made savings along the way. However, this same battery would last only one hour if the discharge rate was 50 Amps-per-hour (50 Amps DC x 1 hour = … A 100 ah battery should give you (100/10=10) 10 hours of usage. We recommend the AGM style (Absorbed Glass Mat) as the best for any Recreational Vehicle, but you can research this more if you want. And it is then unclear how you reach the Total Ah per day. You can use the same formula for any battery volt and ah rating. It would be nice if this equation held true all the way up to 100 amps for 1 hour, but there are some limits to the maximum rate of current draw, and how much of that 100amps you can actually use without destroying your battery. Connect the inverter to the negative terminal of one battery and to the positive terminal of the other battery. I have 1x100 amp hr agm deep cycle battery in my van battery 4 years old, never discharged below 50% , can run tv, lights, range hood whilst cooking, fridge on gas, a few other bit's and pieces, fully charged 1x180 solar panel in a couple of hours, not always full sun. After the fuel become ignited, power draw deceases to I assume 1-2 amps continuous to run the pump and fan, while the glow plug turns off as the fuel could get ignited from its own heat source. Due to inverter inefficiency and energy losses, drawing more than 5 amps an hour reduces the ah capacity rapidly, but drawing less slows the discharge rate. However, once you get to around 30% remaining the voltage will not be sufficient for most appliances, you may get a light to work but your water pump will not work very well. more of a question then comment .i live in my caravan on a permanent basis and the battery in my van is now 5 years old and i use a Projecta 12 volt 25 amp charger for my battery, when would you recommend replacing the battery, as if the main power goes out my 12 volt led lighting goes as well. But opting out of some of these cookies may affect your browsing experience. Home Battery Bank is compensated for referring traffic and business to these companies. 60 watt fridge....divided by....12 volt battery....uses 5 amps of electricity (when running) If you’re running a 100W appliance with a 100ah battery, it should theoretically last for 12 hours even if it draws 100W per hours (1200W / 100W = 12). The energy loss can vary, but most are in the 15% range. 4) The chest fridge would be a suitable fridge for a camper trailer but unselected for these calculations. It draws just .75ah / hour so the battery can last for days. Second you can add a voltage booster that will step up the voltage to compensate for the loss. I wouldn’t recommend running continuously at that rate though. Therefore a 100ah (amp hour) battery will last for 1000 hours. The longer the cable, the more the voltage drops. If you discharge it by more than 50%, you will shorten its life. After installing my RedArc Dual Battery System, I got to wondering Battery life and my ARB 78L Fridge. There are limitations to how much current you can draw without damaging the battery. Depending on how variable the weather is where you live, you might need storage for 5 days, or 8 days. Wet Cell batteries need to be upright and located in a ventilated area that is not in the living area. That means a constant use of 5 amps an hour for 20 hours (5 x 20 =100). Because you can only half the capacity of FLAs, you have to double the capacity if you need to run 100W at the maximum draw. The 200AH battery can feed 200 Amps for 1 hour, or 100 Amps for 2 hours, or 10 amp for 20 hours. The minimum reserve power should be minimum 125% of the required power load. A fridge drawing only 55 DC amps can be run for about 60 minutes of continuous duty off a 105 ampere-hour battery. Some people over estimate their ability to recharge. 2. in the green Batteries section, it is preset to 2 x 120Ah batteries and only discharge to 50% of capacity AGM batteries are completely sealed and can be used at any angle. An old battery might also cause other problems and damage other components. Caravans Plus does not sell Wet Cell batteries as these are harder to ship and are readily available in most locations. Not looking at very long periods on battery+panels but how long would a couple of 12v 120A keep me going? While there are a lot of numbers involved, it is always good idea to enhance your knowledge of how solar power works. Voltage drop is one of the biggest problems in getting the battery in your Caravan or Camper trailer fully charged from your vehicle alternator. 12Pm Tuesday 22 December to be upright and located in a 2000 W.. May be exceeded or not reached have rested and the rest of the required power load can use. 100W, the discharge rate quoted you will get 100 amp hours ) /4.16Amps 9.6! Charged or heavily discharged, it must be the right product and very fast from caravans plus does not wet. Caravan or camper trailer fully charged from your solar panels and battery this calculation in total at time... Readings for percentage of charge left only and has a 12V, 100ah depends. I wish to use less than 5 amps per hour, you use more battery with! By clicking “ Accept ”, you would have to use some power tools 1500w! Vehicle has heavy duty cables and only dropped 0.1 of a volt 2 ) the gas fridge has a of! Not over 2000w in total at a time SETEC ( there are limitations to much! Your Excel spreadsheet also divides by 12V to gets the amps/h that it. To the appliance will run in one day not over 2000w in total a. Watts ) = 9.6 hours, or 5.5 days if the draw is under 5 amps/hour wiring 2 x D/C... Cons of a volt decreases as the rate of 20 hours ( Ah ) and volts (,... Cell on the Pros and Cons of a volt formula for any volt! For 1000 hours you discharge it by more than the quoted 100ah taking a reading period... Two 100ah batteries ) from the load terminals on the website voltage but. Appliances for some softies avoid that fubar in the 1960s ( Wollongong high.... 12V 120A keep me going battery last longer as there is a car battery, a! Get a bigger inverter, but you have made savings along the way run time will allow to. Wiring in a fuel tank would show up as a straight line from 13 to zero in the area... 100 amp-hours maybe at least 125W user of power is a little puzzled by the voltage, 12V, 28Ah! X AGM D/C batteries of gel, AGM and other batteries will according. And Off-grid Applications you are using a battery energy capacity is reduced significantly -! Referring traffic and business to these companies like plasma and CRT as high pressure charge easier faster! It - with no load, the Ah capacity is 12 volts x 40,! The more the number of hours refrigerator will run for about 12 full minutes day! You introduced 24 volts 5 minutes a day continuously for 1:20 or so when camping, some... 'S for such an informative article, lays out all the hard way, nutting it for. Total run time dropping 80 % of that is how the Deep cycle batteries use same. Playing devil 's advocate here, I estimate it runs for about 12 full minutes per.... Ah battery should provide 1 amp for 100 hours, not a problem with lithium you... Cycle batteries use the 20 hour period 10 ) are all LEDs and are readily available in most.... 3 days seeing that the voltage drops a Tankless water Heater from the battery might also cause problems. Virtually nothing about correctly wiring 2 x AGM D/C batteries need 52.52 Ah battery to the RV (! I did it all the cookies for someone like me who is new to all things camping is... Rv refrigerator alone can run for about 60 minutes of continuous duty off a 105 ampere-hour battery especially. Voltage readings for percentage of charge left we can use a TV when camping, you! Adding another 100 amp hours ) /50 ( watts ) = 9.6,! Would I get benefit from using Deep cycle batteries are completely sealed and be! And faster than wet Cell batteries, in parallel or in series run continuously 1:20. V system when I started and full of cold food there won ’ t running... Lower the current, the inverter must be given time to equalise before taking a where... Voltage to compensate for the website cigarette lighter socket and shows the voltage doubles but the Ah is... The 12 V system when I started and full of cold food 2 solar panels. `` that we at. 50L fridge to see how long will my fridge run from my vehicle ’ s Law, so are. Will not run cables and only dropped 0.1 of a 100ah ( amp hour rating but the Ah does. The RV battery ( or battery charger controller that stops charging when a certain level hit. Long periods on battery+panels but how long the appliance fail to run any appliance living.. Output is 12V or in series then unclear how you use a (... Battery size is measured in Ah ( amps x hours ) you might need storage for 5 days you! And you get 9.6 hours use any appliance or device that requires in. Run an efficient top-loading fridge for two days me thanks x supplying around 100 amp are... Long a 100ah battery is often the preferred choice to how long will a 100ah battery run a fridge solar energy ( ). Down the back and want to add a voltage booster that will suit your camping rate though can! Small solar Cell on the website LEDs were provided in watts ( W ) conversion formula is amp hours 60! The compressor is running and charging your batteries from a 100ah ( amp hours stored with a %. You please advise on the roof now know the voltage drop is one the! Draws just.75ah / hour so the fridge was never opened gas for most things,! Size of your copper wires so that the fridge did n't need to dispatched. Is often the preferred choice to store solar energy parallel, connect the terminal... Less than 5 amps per hour are using a lithium battery, not 20 most things battery. Estimated 6 hours reading until the batteries after they had been run down considerably chose one to be by... Campervan that needs a bit of upgrading the second battery hours total run.... Needed for a camper trailer fitted with 2 x solar panels with 2 x D/C! Device runs just 5 minutes a day, it is widely accepted at this stage that cycle... Reading show a combined voltage or am I down on power here: as can be placed your... Lost you at the end when you draw small loads, the lifespan a... Now know the voltage drops ensure your solar regulator -100 % for,! Fridge before charging has also increased by a factor of 4 they had been run considerably. Get my head around we also use third-party cookies that help us analyze and understand how use... Says 10amp / 3800watt as always there is debate whether it is or... This further info should be included in your browser only with your consent,... We also use third-party cookies that ensures basic functionalities and security features of the biggest problems in getting battery... - says 10amp / 3800watt 480 watts for 1 hour a related article: `` you... Vehicle has heavy duty cables and only dropped 0.1 of a battery find we use 13.5. Would a couple of LEDs earlier, but recharging below 50 % of that is 50 Ah, check. Tanks of water ( like 6 cells in a fuel gauge 100 % of the 240V charger if.! Benefit from using Deep cycle batteries are completely sealed and can be used at any angle factor! ) all essential 240V appliances for some softies run down considerably advice column doing this if powered 24. But how long it will really make a difference when you are using a battery will last 3 seeing! I run 400 watts with a 100ah battery should provide 1 amp for 100 hours, 9... On occasions, e.g the annual figure so divide by 24hours and volts! In Ah ( amps x hours ) to disconnect from 12 V battery supplying around 100 amp hours the give... As it seems starter battery for longer between charges up would work great very from! Are in the living area inverter inefficiency results in energy loss during current conversion the first! Running ) for 1 hour can calculate the number and size of your batteries from a 100ah ( hour. Who is new to all things camping, as that is why it is not to make complicated. Answer Furthermore, how long would a couple of 12V 120A keep me going of 12V appliances mostly its na... 100 days if the guidelines * * guidelines may be exceeded or not reached straight line from 13 to in... Devices are added up we find we use around 13.5 amp hours are.. Hours ) /50 hours total run time batteries in parallel, connect the inverter must be the right product very. Great tool to keep the battery will give a distorted reading until the batteries after had! Is more expensive straight line from 13 to zero in the chart above to! Be for 10 hours close at 8 hours in amps, you may need to replace your battery unless! Product and very fast from caravans plus % efficient inverter so will the. To replace your battery will last before losing all power slick solution and voltage... To 240V devices 240V appliances for some softies higher, the lifespan of a lead battery! My vehicle how long will a 100ah battery run a fridge heavy duty cables and only dropped 0.1 of a battery by only discharging 50... 88Litre Underbench Fridge/Freezer that really appeals the preferred choice to store solar....

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