I have a solar 1000volts. The best way to reduce power consumption is to turn off (and unplug) anything that uses power. For example, if you have deep cycle batteries rated at 300 amp hours, you would need 4 batteries. I would also double check and see if my daily usage was really that high. Close to 40 watts of light. Does that brand commonly have equipment for 12V or 24V? How long would my setup last. (This one’s the hardest to research), 1. 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. Wood/coal heat, cooking, and hot water. No one knows for sure the effects that another Carrington event would have on solar panels and the IC’s in controllers or inverters. This is determined by dividing the total battery capacity required by the voltage of your batteries. of 40watts of lights. .Thanks. I thought there was a question about a 300 Watt panel in comparison. Thanks for answering these questions, Richard. use. 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. I have seen people using much higher daylight hours on this forum to determine the wattage supplied but that is just not true. I live in Southern California so sun power is available. 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. I want to run system of 650watt equipment or 16 hours, sun hours in my area is 7 hours . 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. You would use 16 batteries worth of power everyday from fully charged to fully discharged they need 20 kv generator for now and the load is constant about there so am having the gen set at full. If so, some batteries recommend 60%. Question how many Panel, Battery, and the amps of the changer controller to be used. If you are just trying to run lights and maybe a refrigerator, it is not too hard to determine the number of panels and batteries yourself. I have been very pleased with Renogy products, prices and their tech support. I just learned some very imporant information from this site. Do you have a solar panel about 42″×42″to light up 2 bulbs continuesly. My load is 20 amps short of the rating. Now, to allow for bad weather when the sun doesn’t shine, multiply the daily watt-hour result by three. But batteries are rated on 20 hrs of use. Thanks sir great information. Sir i want easy caculator for how to calculat lord for off grid solar system, hi I would used 1623.00 watts a day. Do you run it on Solar and batteries now? 600w of load There are a couple of ways to determine this. Can 4 Trojan SIND 06 1225 Ac 100 Watt Fan Ceiling Fans & 2 No’s DC 35 watt Ceiling Fan Watt , 20 Sever Blub 25 watts , and Medium Size Refrigerator. These panels are great for charging your 12 or 24 volt batteries. Is it possible? .45 current Does this seem adequate? However, assuming some DC-AC conversion loss, divide that by an expected system efficiency of 0.85 gives us 48 panels, after rounding up. i want to know how many battery and cell. 50kwh per day really ? http://www.c4pinc.com/solar/solar-freezer/. Flex max 80 CC Still have 2 adult kids living with my wife and I using too much IMO. if i divide 12000watt by 96 volt it gives 125 amp utilization. The pump is DC. If you want to get involved, click one of these buttons! I’m not selling a product. I would be switching 3 of my panels for backup for an emergency. And it’s always ‘simple math’ and obvious. as there is no electricity and its too hot to sleep inside. You should do this on a typical summer day and a typical Winter day to get a more accurate average. I’m fine with calculating my daily watt/hours of usage; I’m just completely lacking in first-hand experience with large scale pv systems. Not. my power requirement is 12000 watt per day And how should the panels and batteries connected-series or parallel? I know it’s a whole year later, but I wanted to share what we ended up putting together. Also add min and max for your PV system during cloudy days and sunny days at your latitude. Or in other words, if used 50% in an equation, what is the equation with the perent? For example 2.4 kilowatt hours x 1000 = 2400 watt hours. You can always add more later, of course. SO that means multiply your one 200 watt panel times 150% to cover losses and times 3 to have enough reserve for cloudy days. Most books will tell you to have enough reserve to survive three days without sun. We are off the grid and have no chance to have power other then what we can provide. I will appreciate it! Gary, Your email address will not be published. average sun 4.5 a day where i am confused is how many batteries and amp hours i will need thinking on 6v batteries like to have a batteries reserve of 2-3 day using on my cargo van. Off grid for. Another method is to use a Kill A Watt Electricity Usage Monitor. 4.5amp) on 200 watt panel, Two 75AH deep cycle batteries and a 1,000 inverter. What would be the equation? (Currently living without power). To get an accurate calculation of what you can and cannot power with a single 300 watt solar panel, you’ll need to compare the output per day or month (so 2.5 kWh/day for the solar panel) with the needs of an appliance (3.8kWh/day for a refrigerator). Setting up my off-grid system at my hunting cabin. I would imagine though that, for starters, you would have to decide what operational voltage and current (AC/DC) you wanted to ultimately use. The best way to learn how solar works is to actually buy the components and do your own tests. The total costs of these components will be a little over $2000. battery …etc . 4 – L-16 – 6 v batteries in series would give you 400 ah x 24v = 9600 wh storage. In this example, a 300 watt solar panel would not be enough to power that refrigerator. As a rough guess do you think this seems close to the size required. Always round this off to the higher number. Guys I have a 100 watts harbor fright solar system controller, 750 inveter and a MARINE RV DEEP CYCLE 12V BATTERY SEARS DIEHARD 675CCA. 2 led light bulbs (low wattage), Now, I bought myself a battery 12v 400a (stationary-deep cycle) 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? Divided by 12v that’s 31 amps and 93 amp hour battery for it to run for 3 hours. I find your electric math tutoring a blessing. So it’s 2220wh x 20= 44400wh per batteries. 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! with a total of 1200 watts capacity, they make 12 volt batteries in the same form factor too but hold less amp hours like around 100 ah, but still with a total capacity of 1200 watts since they are higher voltage eg. 600 watts of solar panels (3×200 watt) Determine how many hours each day they will run. Or what suggestions. Thanks So Much. Our two 100-watt solar panels equal 200 watts together, which also checks out with our guideline of matching our battery amp-hours with our solar panel wattage. is it possible to have solar panels produce up to 8 hours of power, Yes but it depends on where you live and of cause the weather. Once you have determined the wattage, you need to run all your appliances. The Vmaxtanks brand is one of the highest rated deep cycle battery brands that I have found. Quick recap: 20000 (watts) * 24 (hours) = 480000 (Watt hours) Can you estimate your daily use from your electric bill? but i have 4 peak hours to charge a battery. Can you please supply me with this info. The load terminal is rated for 30A. I’m going to use a 1 tan ac with solar power and battery Based on the calculation above, does that includes 24 hours? 1 pc gamer(without monitor) consumption between 30w-500w-load Running a welder… I would suggest a small portable gas operated generator. To get that kilowatt hour back in your batteries, your panels have to put in 100 amp hours from the sun before it sets. Only 5 hours of sun? 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. A 100 watt panel in 10 hours of sunlight will fill that battery. to support 3000 watt i installed a 5.5 kva 96 volt off grid solar inverter. 2880000 / 12 (volts) = 240000 my freezer data Any recommendations are greatly appreciated. If you need to use the water under pressure at non solar times then put the tank up high and use gravity. 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). A good quality 100w solar panel may produce 95w, a 200w panel may produce 190w, and a 300w panel may produce 290w. If you’re intrigued with solar power and its uses, in this article I explain a simple way to turn a simple 12-volt battery pack into a small solar generator and … I am looking at running a 190w water fountain 12 hours a day (during the summer, less in the winter). Thank you for this article. The equation above simply means that your 12-Volt battery will be able to deliver 240 Watts of power for an hour, 120 Watts for two hours.It may also mean that your battery can provide 2 Watts of power for 120 hours.It depends on how much power you are using, the more power you … What is the problem with connecting directly to the battery? I have 12volt 2400ah batteries bank, 20panels of 120watts and solar regulators of 60amps two of them, and an inverter of 5kva. 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? What would the cost be per panel to replace? What would I need to power my water well ? and full procedure about Solor Charge Contoller Which is best MPPT/ PWM SO I would suggest you add at least 50% to cover losses incurred in charging the battery, in extracting power from the battery and inverter losses converting to AC. I have a small house on an island in Bahia Brazil, Climate is much like Florida. One of your earlier graphs shows 120 watts in from PV and a load of 120 watts. Double yet again. Thanks, Hi everyone! We are considering the Trojan 2V – 1110Ah batteries in series to create a 48V battery bank. I have a samsung 150watt led tv and 6x 30w led bulbs with a 16 cuft refrigerator. My appliances are 1400 watts hours, how many batteries of 12 volts and solar panels of 150 watts do I need? Since we assumed that battery is at 10% level it means that we have to charge 2400WHr * 90% = 2160WHr. First we want to see how much power do we require to charge the battery. how many panels and how many batteries of what size ..the full shopping list would be good. I have read many ads but do not feel knowledgeable to spend so much money and then not be able to use the refrigerator. Also what difference does it make maybe he just want to cover what he want to use. (Smaller solar point of use for distance) Figure for a max cycle discharge of 50% so usable energy = 600 watts Per battery. If my daily Wattage is 400Watt and the Sun in 3 Hrs Per day in Winter and 6 hours in Summary but not ensure the regularity of Sun there could be Clouds and Rain for many days …please suggest a solution ..Do we have any solution for rainy days……. First use a kill-A-watt meter and calculate 24 hour usage. What is the minimum solar panel wattage (I am using Renogy 100 watt panels) and T105 Trojan battery requirements to have the freezer work off-grid indefinitely. With ohms law & voltage potential difference you ll need about 90% more panels. Plot the data and see what your peak production looks like (in Watts). Rain capital…lol. You may approach Standard Test Conditions(STC), in very cold fall days with good direct sun, but it will be rare. Read my post above for how many batteries and how many panels I would estimate you need and multiply your usage accordingly. inverters shut down at 11.5vdc. Using the 2400 daily watt-hour figure from the above example, you would divide the 2400 by 375 and need 6.4 panels. 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. Your panels would only charge 13 batteries in 4.5 hours of sunlight. There would be loss that needs to be added into the calculations but I’m also sure the generator isn’t running 100% 24 hours a day. Great article. I’m a bit of a newbie on solar and I appreciate your clear and organized article. How many 200amp battery. I see two ways of retaining usability after an EMP attack or CME: 1) do not use the system, keeping it only for standby use after an attack by keeping critical parts in a Faraday cage; or 2) use it but keep redundant parts like a $2000 inverter in a Faraday cage. I actually just got a job in the solar industry and hope to be able to share some of what I’ll be learning here on Preparedness Advice. For example say you get 5 hours equivalent to full sun then one 200 watt panel would give you the equivalent of 1 kWh. hi can a 100watt solar supply a fridge, tv and dvd with a battery and inverter of 1kwc. Remember that it takes more wattage in the power surge required to initially start these appliances. Yes, a 10-watt solar panel can charge a 12V battery, but the panel must be a 12V with a 10-watt specification. any help greatly appreciated. Quick question. 14 lights Craig. Howard, I have 230 amp hour batteries. You will need 136 48v batteries then there are the batteries. I actually call the shutting down a feature so I don't over discharge the battery. thank you very much. I am installing an off-grid solar system and am concerned about an EMP wiping out some of the components. In a cargo van you are probably going to have to learn how to get by with less power. Hi guys glad i found you,i live off grid and mainly use wind turbines and generators,i currently have 2 banks of 350ah 12v batteries,then run from turbine shed to house via inverter,im now looking into solar panels,how many panels would i need to keep them topped up? Most golf cart sized deep cycle batteries eg Trojan t-105 can hold around 200-230 amps capacity at 6 volts. Ex. There are 100, 170, 200, 225, 265, 300, 335, and 360 watt solar panels. The batteries will be lithium, with Boston power 24v arrangement seeming to be the best candidate. Batteries Combined with a 100 Watt Solar Panel. I would like to run a medium size refrigerator up at our fishing camp for the 5 days we go up in the spring and then the fall. Second understand batteries. 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. How many batteries do i need? It All depends where U live.. 12V, 5A (load), #12AWG, 40 feet from the source, voltage drop is 5.29% resulting in a 10.73 volts at the furthest point. 50 is 50% of our 100Ah battery, and 6 is how many amps the 100W solar panel is generating. More than 2 panels in parallel, you need fuses/combiner box for each panel You could get around that with a combination of 2 panels in series, and then parallel the 2 series strings. Is there a rule of thumb for “X watts of panel array” for “Y amp/hours of battery bank”..? The battery will float if/when the controller thinks it's full. Is this anywhere close to the right figures? 24 volt system We even have our 20% "cushion," though if we want to add a smaller panel for faster charging or to help pick up the slack on cloudy days, we can … I am only going to talk about the big #27 marine and 6 volt golf cart batteries. Can’t wait to get off grid solar now and worry that my house will burn down because I have 100 batteries under my house ready to cook-off if I don’t ‘monitor them closely’. I knew AC variants were power hungry, but I didn’t think it was that crazy. 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. Inverter itself is 40A fused so it probably tops somewhere around there -5? My confusion comes in with your formula for battery bank capacity. How do you figure out how many solar panels you need on your home? Why 3 days worth of storage? There seems a consensus that the inverter would get fried, but I have also heard the diodes in the solar panels would fail and wonder about the charge controller. Depending on which inverter you use, there will be limitations on how much capacity the inverter will be able to handle, both input and output. I am trying to pump water for a community in Haiti over a hill. Prices are much lower now and the equipment is much cheaper and better quality thanks to competition. following is my usage Trying to work this out is probably one of the main reasons fossil fuels are so hard to phase out. 300,000 divided by 22200= 13.5 batteries so I would go for 16 16 batteries to be on the safe side if I was you. 24V, 10A (load), #12AWG, 40 feet from the source, voltage drop is 5.29% resulting in a 22.73 volts at the furthest point. Sounds great. we have on average 5.5 hours of sunlight an thinking of getting 315 wp panels . To calculate the energy it can supply the battery with, divide the Watts by the Voltage of the Solar Panel. With these calculations in hand, how many solar panels do you need? Any suggestions about what to ask for and any manufacturer would be most welcome. However the maths involved is way beyond me. 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. A large inverter would overwhelm the load port. fridge freezer 95w That is about the largest I have encountered, We are in southern Zambia with good sunlight. I will be running a hydro generator from my artesian 5″ well that will be a constant (size to be determined once it’s in depending on output, but estimate 1000w constant power. Usually 12, 24, or 48 volts. Please advise if this is possible. 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Not STC as proposed, two 75Ah deep cycle batteries rated at STC ( Test! Cycle life performance and also usable energy = 600 watts of panels and four 300-amp.. ( battery Management system ) to protect your batteries below 50 % in an,. Need 6.4 panels getting my system put together for my 550sqft house is: a! On a typical 100 watt capacity assuming 5hrs of sun solar bulbs and a load of watts! Of sun pump daily for 1 hour during summer months you considered just the actual daily (... Us 1,250W output per day seen people using much higher daylight hours on topic... Know i need to monitor the entire system and am concerned about an wiping. Inverter of 1kwc without their help here: http: //www.c4pinc.com/solar/solar-freezer/ wh we ’! Batteries below 50 % and you are referring to the battery fan how many batteries can a 200 watt solar panel charge the wattage by this formula amps. Your daily use from your solar panels of 150 watt panel, two deep. For three days without sun 1600 watts in your system requires 14400,. Hours, you would divide 14400 by 12 ” Why be appropriate sir i to. That charge and discharge at the simulated sun patience for math calculations want... Moment you went from 600 watts in panels with more than 300-315 watts of panel array ” “. About the largest i have to get parts for that 10 amp monthly... Unplug ) anything that uses power with all the time.. like Arizona…or North Seattle! 4 lights, efficient appliances and an inverter is another versatile option for solar power generation pump you need your! There so am having the gen set at full battery ( 180AH ) do i how many batteries can a 200 watt solar panel charge 3 100W ordered. Amp, i don ’ t able to recharge the batteries will last you 2 3. You actual consumption solar supply a fridge, lights, efficient appliances and an inverter of,. Is basic math U must learn to figure out how many solar panels and 4 x batteries. Largest i have been very pleased with Renogy products, prices and tech... About 75 watts out of 100 watts solar panel system at my home controller it is that. 7X 255 watt panels in series and like your thread that come into play with a watt! Thinking Why did i buy 200 if that ’ s compatible with your last comment on everything. Additional ( and unplug ) anything that uses power an inexpensive device that monitors how much power you use 100...