Hi, this is Josh Roelofs with FYI, aninformational tutorial series from Wholesale Solar. Today we’re going to talk about how to size a gridtied solar system. If you’re not sure which type of system you need, check out our other tutorial called, quot;FYI Four Main Types of Solar Systems.quot; Let’s talk about how to size your gridtied solar system. A lot of people call us and ask, quot;How many panels do I need for my system?quot; and itall depends on how much power you use, which is measured in kilowatt hours permonth. To find this info you can contact the power company or check your monthly energy bill. If that’s not an option you can also use a
meter, load evaluation, or information from the appliance manufacturer to estimate how much power you are using. Ideally we try to look at a 12 month average of your power usage to get a good yearly picture. Obviously, solar is going to produce more in the summer and less in the winter, so a twelvemonth average is really what we need to accurately size a system. Next we’ll need to determine how much sun you receive in your area. The US averages about 5 direct sunhours per day, but depending on where you’re at you might see slightly more orless than that.
This graph shows average sun hours for different regions of the US to give you an idea. Now we can size your system using your average power usage and number of sun hours per day. For example, based on a thousand kilowatt hours a month, and thirty days per month on average, that comes out to 33.3 kilowatt hours per day, divided by five sun hours, that tells me you need about 6.6 kilowatts of solar power to cover your entire power bill. This adds up to be 20 to 25 solar panels, depending on the wattage of each panel. A lot of questions come up when you’re sizing a gridtied solar system.
For example, quot;What tilt angle and what direction should these panels be facing?quot; Ideally, southfacing panels are going to produce the most power, but east or west is also gonna work at a little lower efficiency. In terms of tilt angle, anything ranging from about 10 to 40 degrees is gonna work just fine. Most of our customers are just mountingright on the roof and they’re using the pitch of the roof as their angle. quot;Who installs my solar system?quot; Most of our customers are doityourselfers who are rolling up their sleeves and putting in
their own equipment with the help ofsome friends. If you need help, we recommend you hire a local licensed electrician or general contractor. quot;Does a gridtied system provide power during a blackout?quot; Your gridtied system is going to shut down during a power outage, unless you’ve added battery backup or a generator. You can add a battery backup or generator to your system at any time, and we haveseveral options in stock and would be happy to help you choose a system foryour needs. Once you’ve determined your average monthly power usage and daily sun hours, you’re ready to size that
gridtied system. If you need help, feelfree to call one of our solar experts or visit our website. This is Josh with FYIfrom Wholesale Solar.
Different types of GridTie Inverters for solar power systems
Hi and welcome to quot;FYIquot;, a new informational tutorial series from Wholesale Solar. My name is Josh Roelofs and today we’re going to talk about gridtied inverter system options. Yourfirst option is the SMA Sunny Boy inverter. The SMA Sunny Boy is the only gridtied inverter whichincludes the secure power supply which can provide a minimal amount of backup power during a power outage provided the sun is shining. It’s aUSmade product, highly reliable,
it’s also your lowestcost option. These inverters are designed to work with solar arrays that are positioned indirect sunlight. If you have shade from a nearbyobstruction, such as trees, buildings or something else, you would want to consider one of ourother gridtied inverter options such as the SolarEdge. SolarEdge is a highly efficient invertersystem because there’s a power optimizer oneach solar panel.
It can help mitigate the impact of shade ona portion of your array SolarEdge is the only gridtiedinverter which includes builtin monitoring at no additionalcost, giving you the ability to remotely view system performance from any internetconnected device. Thissystem includes the Safe DC Voltage feature which means you’re not working with highDC voltage when you’re wiring optimizers together.
This inverter system is also expandable. If you want to add to your array at a later date you can plug in more optimizers to yourexisting group of optimizers to expand your system. SolarEdge offers the best balance between priceand features out of any of the gridtied inverter options we sell. It’s suitable for residential or largecommercial systems. In some cases our customers will requireeven more flexibility from their gridtied inverter system
which is when we recommend the Enphase microinverter. The Enphase microinverter is acompletely modular system where there’s one inverter for everysolar panel, so it’s expandable. It can help mitigate shade but thissystem is really ideal for people who are starting out small and expanding later. There’s no minimumrequirement; you could literally start with one panel and one micro inverter and get yoursystem up and running
This system uses ac wiring instead ofDC voltage so it’s considered to be safer and easier to install especially for theDIY installer. The microinverters have a lotof great features including the longest industry warrantyat 25 years, advanced monitoring is available withthe Envoy hardware, it’s also the most flexible system ifyou need several groups and panels at differentparts of the roof or different groups of