Here you can find Solar Panels and technological accessories related to Solar Energy: Click Here If you want to learn about Solar...
Here you can find Solar Panels and technological accessories related to Solar Energy: Click Here
If you want to learn about Solar Panels, to advise you before buying or to build your own Solar Panel: Click Here
foreign to San Tan solars part three of our series of building your own off-grid system now previously we've already we've talked about um your requirements here power Knees by doing a power audit and uh just finding out how much wattage you're going to be required to run and for how many days of autonomy do you want to run with that in mind then you want to make sure you can size your battery how much storage you're going to need for that wattage and that power requirements that you have from earlier so now we're at the point was how big is an array of panels that we're going to be using so a number of panels can be determined by several factors one is the electricity that you're going to use how much space you have in order to put these on your structure or your RV or camper how much of amount of daily sunshine do you get and of course the type of wattage of each panel after knowing what we were going to consume we would need to determine what usable sunlight that we're going to have just remember that a usable sun is not the same as how many hours of the day there are of sunshine how many daylight hours there are there's two different things because you got to understand that morning hours in the morning when the sun is starting to rise you don't get a full sun on that so that's not really considered a full day of sun direct sunlight because it's only in the um in the evenings and in the mornings it's going to be low to the Horizon it does it won't be giving you a lot of energy so by the time the best energy is going to be even like noon to one where it's at its peak that is the most usable daylight that you're going to have to run your panels and your panels will then be at their Peak keep in mind that also when you're determining the daylight hours that you're going to be having this is also your location a lot of times Travelers or people who are going to be putting up panels might be further away from the equator the closer you are to the Equator the the more days of sunlight is you're going to have say for instance we're in the southwest here we get them on an average of about five little over five days of sunshine of usable daylight going further north in the United States that number seems to dwindle just a little bit because your angle has to be turned a little bit further uh over here in the southwest we can have your panels can be at a 20 angle as you further as you go further north it has to tilt more because the sun is lower in the horizon that'll also help you determine I want sunlight per day you'll get another thing you want to think about is your plan for the seasons depending where you're located at as I've mentioned before here in the southwest we get lots of daylight the winters are pretty mild and we get we get pretty good Sunshine throughout so it's really nice in this part of the country now when you start going to uh Northern parts of the country where the elevation might be a little bit higher and the seasons are more frequent you'll have less days of usable sunlight that means that your temperatures will be colder it won't be as hot so there's some trade-offs there colder the panels are the more they produce however fewer days of sunshine in the southwest or in the South where it's a lot hotter high heat or high temperatures have a tendency to make panels for dues less however they do have more days of sunshine to help balance that out so just keep that in mind the further away from the equator that you're going to be at if you're traveling on an RV in Step you're going to get fewer days of sunshine and that's just that's just you know that's just typical geography there and of course paying attention to your Seasons when you're traveling about or you're building a cabin up in the forest and what have you you might be getting less and this might be more shading because you're in a more hilly and mountainous areas the more flatter it is usually you have a little bit better clearance for Sunshine hitting your panels now I also want to keep as you can see behind me that panels come in different sizes and shapes and the amount of wattages that they put out for instance we have some 250s 255s and of course we have like 280s and they get bigger so you go like 300 and up that's in wattage so they can have a tendency to to being taller as this one back here is this 285 and as opposed to the 250s 240s which are about this height they're about 65 inches tall this one's of course a lot larger than that that comes to another thing of how how are you going to mount these are you going to be putting them on the roof be putting them on a shed a barn are they going to go on top of a camper are they going to be ground mounted that's also going to determine the size of your array and when you're looking at the size of the array you have to consider where it's going to be at if it's going to be mount ground mounted is it going to be higher up or it's going to be lower down trees are going to shade it you got to find Optimal spots for that if it's going to be on your roof or it's going to be on the shed you can mount them on the shed so that you know like air pipes um trees and antennas and things that are sticking up out are not going to overshadow some of the panels as the Sun starts to wane or rise uh depending on your location of course so a lot of wattages are determined on panels how do they determine that standard testing conditions that's called STC and that STC is what's usually listed on the backup panels using vent STC it'll tell you what the VOC of each panel is the vocs of course with the open circuit uh voltage is so basically how much voltage can these put out without a load on them that's the determining Factor when you start adding them up the ISC which is the um the short circuit current is basically telling you the amperage of each how much amps each panel is going to put out when you start placing power requirements you've got your power needs you start uh configuring your panels you know how many panels in a string do I need four in a string two strings do I need uh you know five in a string four strings or four panels and so on and so forth that also helps determine sizes in how big it's going to be another thing to keep in mind as I mentioned earlier about wattage is that these are like 250 Watts this is a 280. they got some that are even higher like 400 455 uh four tens and what have you uh bigger panels the more panels the bigger they are the more proficient they can be because a they can put in more cells they can squeeze in more cells in a larger frame panel that will be a better performance it does raise the wattage and the voltage is up for instance I have a five kilowatt system okay and you have 250 watt panels that you're going to use they will require 20 of these taking up approximately about 351 square feet if you put them in like uh uh you know five panels in a row four rows you're looking at about 351 square feet and of course that's going to take 20 panels for five kilowatts of power now say you're going to use something that's a little bit bigger like say maybe a 410 watt panel you're only going to need about what 12 of those panels now they are a bit wider and bigger but you can use fewer of them and if you can freak them to like four panels and three rows you're looking at about 254 square feet based on its Dimensions so you can get smaller space with just the same amount of wattage for five kilowatts or you can use a lot of panels to reach achieve five kilowatts but they're going to have more panels spread out so that's something you might want to keep in mind now of course the bigger the panels are the more cost is depends on your budget if you're looking for more budget things uh budget friendly panels you can get some used ones they are a great bargain here and of course you can get as many of those as you can as long as you have the space okay we did our power audit we determine our battery storage now we have to account for and we have to also account for like real world losses generally estimated to be around 15 that what I mean by real uh World loss is the inefficiencies of the systems because it's going to be you know hot cold wires how much is that going to do it's going to have some wire loss depending on how far away it is some panels remember panels that always put out 100 of what they are rated for like for instance a 35 volt rated STC rated panel may not be putting out 35 volts it might be putting out something close to like 34 or 30 uh 33 just depends on how much sun it is because it will vary depending on how much direct sunlight they're going to get on your location so what size is that PV Ray going to be so let's just say yep that five kilowatt system okay so we have a five kilowatt system we need to run for like three and a half hours of autonomy so we're going to have a 5000 watt hour system that's five kilowatt and we want to run it for three and a half hours that's going to be about 1428 Watts that's the size of your PV array okay and then if uh you take that number and you plan for the inefficiency so about 15 so if you get a 1428 uh watt array and you uh put that efficiency you divided by that efficiency number you're looking at 1 650 Watts array size okay that's for instance a seven uh 240 watt panels is what's going to give you that that 1650 Watts sounds good right that's not too bad seven panels that's not too bad giving out that much wattage now it's going to vary depending on what your user needs are going to be you know you've already done your power audit so if you need more probably need more panel or higher wattage panels just depends on what you want to use how are you going to use it and uh the space that you have available also your battery bank is it going to be a 24 48 12 volt battery bank that's also going to be determining how many of these you will need that means that when you have a like say a 48 volt battery you can pretty much put a lot of pounds to that to feed it now remember it has to be charged up by the panels that you're going to use so you have to think about that as well that's when we start determining how big our array is going to be why those figures I gave you so keep in mind that when you are putting up panels heat and cold do play a factor and also you're determining your size as we discussed earlier were you where you travel to if you're going to be up in the north country where it's colder panels will produce more but have less daylight as that we said earlier so you want to take a look at that and keep that in mind you can get a 35 watt panel and then in the cold temperatures even though you don't have much daylight they'll be might be putting out 37 volts they might be putting out some more output and that's helpful because it does compensate for the lack of daylight that it'll have thus it'll help you store things better so once you've decided your panel size how do you want it mounted you want to put it on a roof shed carport ground Mount what have you or you want to put it on your RV because it's going to be traveling in various Shades is going to be happening you have small panels big panels you'll be figuring that out to find out what your size of panel Ray is going to be so for further help on this you can just check us out Santan solar you can either speak to one of our sales reps or go online and see what our website has and kits that will already be pre-done to find out how much kilowatt usage you want to have if there's any questions feel free to call us email us and we'll be glad to help thanks again ...
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