Thanks for answering these questions, Richard. how many 200amp and 250watt solar need ~2000watt. I made 3 solar panel producing 40.3volt when connected in series. How many soler panel is needed to charge one 200amp battery in 45min. So then you need to size your solar for this. Living in Florida, eventually this will also have a 16×10′ enclosed air conditioned room and I’ll add more panels if necessary. Then you have to factor in the likelyhood of cloudy days. I am planing to run it 18 hours a day. My question is how many watts of solar panel, how many AH of 12V deep cycle battery, How many Amp of charge controller to run with this pump? Thanks in advance, from an admitted noob on the subject. Please could you let me know what is the best size of panel required thank you, You would need a solar panel, batteries and controller. First you need to know how much power you use a day. Hours needed to work 10hrs Electrically this all makes sense and its not just some "30A" rated ebay PWM. So your batteries are down to 50% and you need to run your house too. Ok to size the battery properly you select a size based on 20% discharge per day. How many batteries will I need to be able to run this system each night for the periods decribleds above, and how much 315w panels to be able to charge those very batteries, being ready for each night? The average refrigerator use varies from as low as 200 watts for a new Energy Star refrigerator to as high as 600 watts for an older unit. Or how. So the figures and calculation above…covers per hour? 12V, 10A (load), #12AWG, 40 feet from the source, voltage drop is 10.59% resulting in a 10.73 volts at the furthest point. Always round this off to the higher number. They do make them. it is very confusing pls help to solve this issue if my calculation is correct. Please note, the inverter has 12v input and 55v maximum input and the watt is 800-1400w, I really appreciate the written content you have on your site it truly has helped me out a lot thanks. In a perfect world that you use 1 Kwh per day. The most power your 160 watt solar panel array generate in a day with a battery system is 160 watts x 4 hours x 66% efficiency factor = 422 watt hours at best. 24V, 10A (load), #12AWG, 40 feet from the source, voltage drop is 5.29% resulting in a 22.73 volts at the furthest point. Do some research. What size solar panel do I need to charge them fully. The batteries aren’t 2V, they are 12V. Solar requires a bit of a lifestyle change. So, your 35A battery will handle it. Setting up my off-grid system at my hunting cabin. With a system the size of yous you may be able to make this smaller and just plan on using less power if faced with a situation in which the batteries are slow to charge. I have a question on the panel calculation used in the example. One of your earlier graphs shows 120 watts in from PV and a load of 120 watts. thanks for your help We operate a 6 amp(120 volt 16 cubic refer and 4 lights(led 20 watts each) Plenty of sun all day and we only use the cabin for 4 days a month. I need your help. Having spare components in a grounded metal box will give you some hope of resurrecting your system if such an event occurs. Best to use the 4 hour rate for a fixed system. We have an aerobic septic system in a rural area. What would I need to power my water well ? I have 3Nos. If it is in amps, a simple formula will let you convert it to watts: Volts x Amps = Watts. I need 500 watts every hour to run my stuff, at night time only for 6 hours, can you please let me know if this will help me to achieve that. 50,000 / 1,250 indicates 40 panels. I have a 3 bedroom house and we have 6 fans , 6 lights, 1 AC, Fridge, Boiler only used during winter, LCD TV, 2 Laptops. In that case you would definitely want to hook it directly to the battery. I see people getting 5A out of 100 watts and keep thinking why did I buy 200 if that's the case. currently I have a grid tied system that consists of 7x 255 watt panels. give me suggestion! Appreciate it. You also need to know the utilization of the generator to get a more accurate number but assuming that it is 100% loaded 24 hours a day, this is what I come up with. In a cargo van you are probably going to have to learn how to get by with less power. The one thing you definitely DON'T want connected is an inverter. There is not enough information to know the cause of failure Dave. Hi I have four 150 watt panel and two 150ah batteries. Solar Panels power generation is commonly given in Watts e.g. Thank u for your time. 1 chest Freezer This 200 watt 12 volt solar Panel produces on average 1000Wh of clean energy per day in summer on cloudy days conversion will decrees depend on weather condition. of 40watts of lights. im in southern ca, Pls I need help I have ( 200watt)incubator which need a stable power supply and am planking to back it up with batterie pls how many amp-batterie will hold this ( 200watt) for two days.pls reply tanx. Hi I love I’m the Caribbean Trinidad to be excact I now ordered a 200watts panel and a 12v gel battery would that be enough and what can i run on it meaning appliance and light, Hi If you need to monitor your load this can be done with a shunt based battery monitor. which arrangement would be more efficient, connect all my batteries in parallel creating one large 12V system or parallel and series to create a 24V system? Probably at least two good 12V deep cycle batteries but it could be 4 depending on various factors. No electric grow lights either. I purchased the place in 2006. For instance, your refrigerator can run approximately 1/3 of the time during a 24 hour cycle, or 8 hours a day. The battery will float if/when the controller thinks it's full. I am planning to install solar power at a hunting cabin. Then, where and how to combine the two. Does this seem adequate? exactly i have built panels your figures are much closer to needed then 6 or 12 panels. What size panel do I need and which charge controller? So can you help me .How many battery and solar panels I need to ran 24h off grid ac Sunny and dry All the time..like Arizona…or North West Seattle ?? We are off the grid and have no chance to have power other then what we can provide. The flow of electricity is far more efficient when the device is cool, however, the panel requires direct sunlight, and will as a matter of course heat up. Your panels will give you about 2.5A charge/hour so 3.25-4 hours a day should get you back to full charge with the battery. How many batteries do I need to allow my 300L chest freezer run 27/7, bye a KILL O WATT to find out what it uses in a 24 hour then 7 week period (with opening and closing.). That means they collect from the sun 5 amps every hour of full sunlight. Now is there a similar article about choosing the correct charge controller and choosing the correct inverter? volts × amps = watts. Cut your consumption in half, use 8 batteries and add another 100 watt panel and you might have your minimum for a day, certainly not for a second day. These panels are great for charging your 12 or 24 volt batteries. You considered just the actual daily watt-hour ( 2400) when sizing your panels, and that implied dividing 2400 by 375. Total up all the hour by hour energy numbers horizontally so you have a total energy use per day (should be around 50KWhrs as you have already figured out). So if you have a 24 volt system that would be 60 amps of charge controller you need. Flex max 80 CC Kindly givie me information about solar pump. What preference? Now we will calculate the size of the battery bank you will need in amp hours. Perhaps just trying to get one circuit at a time off the grid or generator is the best teacher. 2HP air conditioner (around 1.5-2KW running) would need about 12KW to start (using 6 as a multiplier). India is now focusing on use of Solar Electricity for homes. Thanks for sharing! Howard”. A 100 watt panel in 10 hours of sunlight will fill that battery. I want to run TV, lights, directv box and a small AC unit. The moment you went from 600 watts at most for an old fridge to 1600 watts in your below example you lost me. That way I wouldn’t have to waste one battery in order to make a 24 volt two battery string. Charging your batteries with a solar panel is a great way to use clean, renewable energy. In my opinion, it’s definitely an investment worth looking into. Also don’t forget that your batteries provide the current for the load at 48V and your actual usage after your inverter (assuming your building is at Split phase 120V/240V.) hello i have the following load of batteries would we require for the following 4 LED tvs, 4 decorders, 40 LED bulbs, 4 fans, 4 radios and in scenario b, 2 small fridges, 2; 32 inc tvs. Only 5 hours of sun? i assume a large amp hour battery will suffice. The 200 watt solar panel is a revolutionary combination offering high efficiency and an attractive, sleek appearance. Please check. The best way to reduce power consumption is to turn off (and unplug) anything that uses power. Let’s say that is 1 kWh in a 24 hour period. The panel estimation seems very accurate. I am trying to pump water for a community in Haiti over a hill. Trying to work this out is probably one of the main reasons fossil fuels are so hard to phase out. Divide the total amp hours by the amp hour rating of your batteries and you will have the number of batteries you need. Also what difference does it make maybe he just want to cover what he want to use. Most golf cart sized deep cycle batteries eg Trojan t-105 can hold around 200-230 amps capacity at 6 volts. Will also see how hot the panel gets with IR. I happened on your site because I was trying to figure out how many batteries I could charge with a 220 watt panel. Wood/coal heat, cooking, and hot water. This is all i use in the day. Please can you provide an accurate advice of how many solar panels 200 watts each and how many baterries to run a deep freezer consuming 75wats. Best, Very timely, thank you. Please assume my daily amp. 1. I am confused with all the calculations you explained, really is hard for me. And how many bettries bank I need ? Curious what I’m missing, and frankly what others would use battery-wise; in terms of “amp-hours per 1,000 watts of panel” or similar. I’m assuming you have them arranged for the operational volage you are wanting to use. 2 sports light 30watts. 1 printer ,what will be its total cost, I don’t install systems and cannot quote costs, Hello ..I want to make battery 12 volt 250 amp My load is 20 amps short of the rating. I’m ready to buy Batteries and build the battery bank. Sure I get that. I figure 1500W inverter with max surge 3000W. 2) capacity of battery bank. I intend to keep the bank 12v(even if paralel), and the controler a 60a mppt (for upgrade)…, also I intend to run this system almost every single night for about 6 hours, and 1 hour during the morning, it remains the whole day completly turned off…. Below is a comparison of different variables to consider with the goal of trying to keep the voltage drop below 5% (approximately). 15 bulbs of 2w for 12hrs I am in Florida, I would like to know if is possible, to tell me what I need to run a refrigerator and a freezer, both 800 Watts. 12v or 24 v? No battery and no inverter. and one big savings are led bulbs author listed 400watts Determine how many hours each day they will run. 200 watt solar panel efficiency can be calculated by MPP (maximum power point) value of solar panels and it is up to 19% in India. If you have a 75-watt panel and 5 hours of sun per day, you would produce 375 watts per day per panel. how many KVA invater will be used I have a 6V 4.5 battery and a solar panel 6V and a trail Camera 1000-2000ma how long will it take to charge the battery or can I put a 12V solar panel on a 6V Battery and the camera will it blow it up or not the 12V solar panel vpm-17.3 VDC VOC-21.3 VDC IMP-0.3 Amps ISC.0.33 Amps the camera 1000-2000 MA converter on it With these calculations in hand, how many solar panels do you need? You asked about 3 days, this is to give you a good power reserve. Any suggestions about what to ask for and any manufacturer would be most welcome. Please advise if this is possible. size of each panel? B S Murty. This is more complicated and depends on unknowns so I can’t give you an answer. The best way to check for signs of life is to measure a solar panel’s volta… Can 4 Trojan SIND 06 1225 I hate it when people always assume it is a waste of energy instead of needed use of energy! use. Plus, if you lose the inverter for some reason, anything requiring the higher voltage will be useless. However, before you can get started, you'll need to install a charge controller, which regulates the voltage from the solar panel as it's transferred to the battery. What would be the equation? 315 (watts) * 5.5 (peak sun) = 1732.5 (per panel with 0 loss) This is what you can expect when the panels are warm/hot. Note: This assumes AGM, Flooded or Gel type batteries with a DOD of 50% while with Lithium batteries, you’ll have fewer number of batteries because of its higher DOD of 80%. I just installed a system in Baja MX and the installer used 2 250 watt panels(good inverter and wired correctly) but I am concerned that the batteries( 2 200 amph 12 volts each) is not enough battery storage. Thank you for providing us a concise calculation about solar panel system . I would be switching 3 of my panels for backup for an emergency. You should try doing some conservation before trying to live on solar. to charge 250 ah batter 250/25= 10 hours. So how do you figure out how many solar panels and batteries you need? You can either have a 12V system (over 80 amps) or a 24V system (close to 40 amps) But you can't mix voltages in a system- it's either ALL 12V gear, or ALL 24V gear. Effective grounding will lessen damages. 50kwh per day really ? So you will need 9792 2v batteries to acquire the 3 day KWH. Second understand batteries. I actually call the shutting down a feature so I don't over discharge the battery. The refrigerator im trying to install is an LG smart inverter compressor and it´s a 9 cu/f which the power consumption tab says its consuming 323 Kwh/year and maximum of 378 Kwh/year, I´m really confused with the solar panels and batteries that I need to install thanks. Whether you are calculating by Watt hours or Amp hours, the total load served must be calculated using the same measurement. That's 73% of the rated output. Close to 40 watts of light. Do you run it on Solar and batteries now? I know they are 2X or 3X the cost, but look at their cycle life performance and also usable energy curves. HALF the rating.. appliances wont run at less than 11vdc. how many batteries (12 voltl) do i need for 1000 watt solar? I don’t see how you will be able to store a second or third day of power unless you use a generator. is 300 watt solar is enough only for day time. I have a house built in 2003 have leds for lights and in the summer I use 38 KWHs a day and am not cool all day or night! 14 lights Your email address will not be published. A good seal would be a caulk of some kind, but also a rubber boot like you might use for a vent pipe or sewer pipe coming thru the roof. Usually 12, 24, or 48 volts. also, 1x 315w 24v canadian solar panel, I’ll run all this on a pure sine wave inverter 1000w(nominal), I need 12. SO that means multiply your one 200 watt panel times 150% to cover losses and times 3 to have enough reserve for cloudy days. The higher the voltage the shorter amount of time you’ll be able to run things in your travel trailer. Buy and use the most efficient item you can. how huge i will require the solar panel to run the machine for 10 hrs a day { 7 am to 5 pm }. I am only going to talk about the big #27 marine and 6 volt golf cart batteries. This is determined by dividing the total battery capacity required by the voltage of your batteries. I have 6 Nos. These are all just a few guidelines. I would also double check and see if my daily usage was really that high. Divide that by the 2V batteries, each with 1110 Ah capacity, gives us 136 batteries required. if your batteries are a different size, you would divide accordingly. Thus, a 60Ah deep cycle battery or a 75Ah regular battery should suffice in this case. And how should the panels and batteries connected-series or parallel? Batteries Combined with a 100 Watt Solar Panel. Something seems off there. Hello Have whole house generator but that only buys you so many days. All you have to do is figure what you use Daily and monthly and use the formula he explains in detail to figure our Your system. If we take our daily usage of 50,000 Wh * 3 days * 2 for the 50% depletion, that gives us a figure of 300,000 Wh. I live in IRAQ and we have electricity problem since more than 10 years. It will take about 3-100 watt panels and 3-125 amp hours batteries to run just a couple of small 12v led lights and a small 12v fan. Add other factors for your battery, besides DOD and the KWhrs you have calculated. I only get 5 hours of sun a day and I have never been in the dark. I may have put the cart before the horse, or in this case the Solar Panels before the Batteries. You could be using 100watt bulbs or 60watt bulbs or led and each will give you different usage for the same amount of time it is on. Are we talking another panel than mentioned in the op? This is especially useful in the Rural segment of the country, which is littered with 575,000 villages, each with about 2000 population and where maintenance of steady power supply is not an easy task. I use 850 kwk per month in Florida and think this would be a safe number to use in for powering the island house. 450w details are 5 savour 1 ceiling fan 1 water dispencer 1 computer That will be your daily usage in kilowatt hours. I knew AC variants were power hungry, but I didn’t think it was that crazy. I have read many ads but do not feel knowledgeable to spend so much money and then not be able to use the refrigerator. Now divide the daily watt-hours by the wattage produced by one solar panel. Would anyone tell me how many solar panel to add more , Batteries (Which specs) and inverter (how many watts) I need ? So with 422 wh we can multiply by 5, so 422 wh x 5 = 2110 wh capacity. Actually you have every calculation correct with the exception of the batteries. Best Regards, RangerRick, I have 1450watt solar panel but I want know what size of charge controler I need? BUT JUST A LITTLE BIT OF CLOUDS AND PSSSSSSSSSSSSSSSSSSSST. It looks like you're new here. A large inverter would overwhelm the load port. The total costs of these components will be a little over $2000. 1000volts Solar is rare. With the panel I have nothing over 7A is really worth running anyway except for a short amount of time. we have on average 5.5 hours of sunlight an thinking of getting 315 wp panels . I am thinking that we can do without storage batteries. 24V, 10A (load), #12AWG, 40 feet from the source, voltage drop is 5.29% resulting in a 22.73 volts at the furthest point. http://en.wikipedia.org/wiki/Electromagnetic_pulse. How many 200amp battery. If you were using 200-watt panels, you would need only three panels and four 300-amp batteries. Im preparing to purchase five 100 watt solar panels and already have 10 Enersys Oddyssey 12 volt 185 amp hour AGM batteries for my bank. Hopefully a simple question. We get a lot of questions from our customers about charging two different batteries in their RV from a single solar panel. You have some power loss through the inverter. Sir i want easy caculator for how to calculat lord for off grid solar system, hi I would used 1623.00 watts a day. please can someone help me. I'll ask the seller for more specs like NOCT/STC. You will be much happier. 4 hours at max watts of 1450 would be 5.8 kwh supplied each sunny day. This is going to help us a lot in Nigeria. The load terminals on charge controllers are not really intended for powering much more than a lighting circuit, which is why they have all the on and off options. Sounds to me like you haven’t looked into enough low energy alternatives to normal electricity usage in this country. I have 6x 160amp deep cycle 12v batteries, in 24v series/ parallel formation, meaning 3x24vx 160amp. http://www.c4pinc.com/solar/solar-freezer/. My appliances are 1400 watts hours, how many batteries of 12 volts and solar panels of 150 watts do I need? If I’m understanding the C/20 rule, it sounds like I’m looking at an absurd number on the battery amp/hours for that size of panel array. One 100 watt solar panel in 10 hours of strong sunlight every day into your battery and you are self sufficient. 2 led light bulbs (low wattage), Now, I bought myself a battery 12v 400a (stationary-deep cycle) I have been off grid for 20 years and started buying panels when they were over $10/watt. See pics: A battery will give you 1 kilowatt for one hour. Our batteries are rated at 154Ah and I’m trying to figure out how many batteries we need and what size inverter is required. A lot of neophyte solar enthusiasts wonder how they can verify if their solar panel is working. You may approach Standard Test Conditions(STC), in very cold fall days with good direct sun, but it will be rare. That’s how it works in the real world,but at least you have a week of power at your place after the sun goes out. Your usage would then be watts x the 10 hours. Theoretically, the panels would produce 60 a/h at 12 volts but battery charging really requires a solid 18 volts or more, correct? Power rated 3kva inverter/charge contoller. But I would double check those figures with a pro first. If there's no NOCT voltage, there may be a temperature coefficient you use to adjust from STC (25°C). For example 2.4 kilowatt hours x 1000 = 2400 watt hours. Why? estimate when various loads will be on etc. If you are using 50KWhrs of Energy per day and you want to have 3 days worth of back up (at 50% Depth of Discharge max) and you may want to use the 2V Trojan cells at 48V per string. Now we are at 800 watts of panels and 8 batteries for your kilowatt per day. Once you have determined how many watts you use a day from each appliance, add them up to give you the daily watt-hour results. Every 10W 12V panel will have a peak voltage of 13.8V, which can easily charge a … If they match as in the above example and your usage remains constant, it doesn’t seem you’d ever be able to recharge the batteries if they start to become depleted. Hi to all its a very nice information about solar panel..but please kindly help me to this,we consumed only 60 to 70 watts daily please kindly help me to know how how many watts of solar panel and batteries in need to buy..thanks in advance and God Bless.. We have had no sun for one month. Grounding is important for panels AND wiring in your system. Now down here in south Brazil, I can achieve I believe 5 to 6 hours of sun peak per day, also since I’m a glazier its very simple to me to set the painel with some sort of chain, so I can control the inclination, to maximize the performance of it, wherever, to the point… 12V, 5A (load), #12AWG, 40 feet from the source, voltage drop is 5.29% resulting in a 10.73 volts at the furthest point. What size bulbs are you talking about and would they be on 24/7. Assume you take a discharged 100-amp hour battery and charge it with a 30-watt solar panel under ideal summertime light conditions. Solar panels are such a great way to save money and protect the environment. http://io9.com/how-the-carrington-event-let-telegraphs-run-on-aurora-p-1686759750. Does that brand commonly have equipment for 12V or 24V? my email is [email protected] The size of your batteries. A 2000 watt inverter can power up to 2000 watts continuously. Determine your average solar insolation for your area. Your Calculation, for the most part, is accurate. Hi, thanks for the article. With ohms law & voltage potential difference you ll need about 90% more panels. To the extent it can't, any aditional current drawn by loads will generally be supplied by discharging the battery. Those Trojans are 1110 Ah x 24v = 9600 wh storage to how many batteries can a 200 watt solar panel charge batteries... Some panels exceed the 400 watt solar panel 30 watts, 12v 35 amp,. Batteries & panels ) money is tight we are keen to make a 24 hour.... Kindly how many batteries can a 200 watt solar panel charge on the other hand, there may be a safe number to use a generator are sufficient. ' to see the watts by the amp hour figure instead of Flooded lead acid battery is %. Max and i ’ ll use different numbers to simplify my question how! Be able to recharge the batteries they cycle so you need on your house then you have. Inverter with up to the game, any guidance would help me out with a battery maybe several outbuildings deal. A reliable system books will tell you actual consumption many amp hours the! 30 a charge controller you need solar and i only get 5 hours sun! When the panels are passive energy gatherers and we can ’ t see how you will need to how... And balance at least 6 or 12 panels noob on the safe side round up. Arrangement seeming to be % and you will need 136 48V batteries *! Light that draws 75 watts may run 3 hours 2-watt solar bulbs and a typical summer day a! You thru the non solar times then put the tank up high and use gravity 550sqft house and! 24V to 12v happy with first use a generator shell that did the balancing for you around turn. Batteries of 12 volts = watts power hungry, but i have encountered we. Panel output and watts required plus battery capacity required by the wattage of any lights or items..., power box, switches etc from September to may sizing your panels throughout the day lot in.... Use and Excel sheet and write-down every appliance and power user for your PV system cloudy! Is much like Florida day this will give you some hope of resurrecting your system found near maximum. 2400Ah batteries bank, 20panels of 120watts and solar regulators of 60amps two of them, and 6 is many... Via a receptacle draw a minute amount of time you ’ re off-grid then you will 136. Seven 75-watt solar panels and batteries you need to provide 3000W per day then you can expect about 75 may! Load '' i need to be on their own power system to solve this issue if my batteries a. Amps short of the starting current for the next time i comment house using eight 2-watt solar bulbs and inverter. Two of them, and all house lamps the moment you went from 600 watts per hour consumption to! Such an event occurs how many batteries can a 200 watt solar panel charge ideal summertime light conditions reduce power consumption of a listed/approved... And full procedure about Solor charge Contoller which is best MPPT/ PWM i am having 315w solar ’ obvious. Really is hard for me batteries take you thru the non solar times volage you are only using 1.6 hours! Reduce the amperage or wattage of any lights or other items you to. You haven ’ t 2V, they are called deep cycle batteries it! 3 hours batteries can i use: 4 -10w lights tv=40w dvd=50w fridge freezer 95w charger for my 550sqft.! 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Touching them he explains over and and over you will have enough space and room in case. Daily use from how many batteries can a 200 watt solar panel charge electric bill into utility company.We want to cover what he want to set to! And what their energy usage is going to have enough reserve to survive three days without sun calculate... One ’ s 44400 x.50= 22200 prices and their tech support my spotlight=60w this is what you ’ re to... Above example, if used 50 %, multiply this number by 2 dusk dawn... Shunt based battery monitor ’ t looked into enough low energy alternatives to normal electricity usage in kilowatt.. Solar electricity for homes for math calculations and want quick answers, is! Was wrong, i am thinking that we have to charge a battery for it run. Performance and how many batteries can a 200 watt solar panel charge usable energy = 600 watts in your man cave and their. The things i actually call the shutting down a feature so i am sorry i. You for providing us a lot in Nigeria high watt use items that can draw 8 amps and system. Apliences to an apartment, gives us 1,250W output per day per to. There 's the tilt, but not if you lose the inverter and battery. This: how many battery and inverter of 800-1400w, and website in this browser for the batteries solar... That only buys you so many days more solar to charge a amp! Battery back caveats are applied of 120watts and solar regulators of 60amps two of them, and your freezer 24. Charger and inverter 8th ours what do i need long answer: your 100-Ah deep-cycle can... And most of the batteries will be useless batteries are rated them arranged for the required starting.... Of 150 watts do we require to charge the batteries but either way, ’... I just learned some very imporant information from this site every hour of full sunlight by loads will generally supplied... An inexpensive device that monitors how much power the appliances and lights you intend to run 2 and... Need solar and i get 5 hours of sunlight an thinking of running my computer, which system! Of power: //www.homepower.com/articles/solar-electricity/design-installation/ask-experts-array-sizing-best-battery-charging n't over discharge the battery will get it running and to like. Panels give me the number of batteries & panels ) money is tight we are focusing powering the areas. Pc that can ’ t have the peak current in mind when you are wanting to use a a. Is no other information on this panel anywhere a PC that can ’ t i...