If you want to try your hand at DIY solar, a small off-grid system is safer and easier to install than a full rooftop solar system. In most places, installing and connecting a solar system to the grid requires professional licenses or certifications. And, as we covered in our previous article, many states restrict residents from connecting a DIY system to the power grid. But building a small off-grid system can be surprisingly straightforward. All you need is some simple calculations and basic electrical know-how.
Let’s go over how to plan, design, and install an off-grid solar power system. Solarlock Connector China
Before we talk about installing, here is a list of equipment and tools you will need:
Designing a solar power system means determining the size of the system you need. This size mainly depends on the total electricity requirement of all the appliances the system will power.
To do this, list all your appliances and their power (hourly) and energy (daily) consumption. The power rating of each appliance is given in watts (W), and often noted on the appliance. You can also use online tools to find out the power consumption of your appliances.
Calculate the energy consumption by multiplying power consumption by hours of use. Once you know the power rating of all appliances you plan to run on solar, make a table with power and energy values.
Here’s a sample table. Note that values in the last column are products of the preceding two columns (watts and hours).
The above table indicates that at any point in the day, the maximum power draw from the solar panels is 470 W, and that the total energy consumed in a 24-hour cycle is 2,740 Wh, or 2.74 kilowatt-hours (kWh). Let’s see how to use these numbers to calculate the size of solar panels, inverter, and battery. We begin with the battery.
To size your solar panels, begin by finding out the average sunlight hours in your location. You can find the daily sunlight hours for any location from one of the many sources on the internet. Once you have that number, below is the simple calculation to find out solar panel size.
Total energy required (Wh) ÷ daily sunlight hours (h) = solar panel size (W)
Assuming that the location in the above example receives about 4.5 hours of sunlight daily, we have:
Again, with some safety margin, we can use two 350-watt solar panels. These two panels will be connected in series as shown below.
Most companies now offer batteries specified in Wh or kWh. For the load profile in our above example, the battery should be able to store a minimum of 2.74 kWh. Add some safety margin to this, and we can use a reliable battery size of 3 kWh.
Selecting a charge controller is similar. Look for a charge controller with a voltage rating that matches the panel and battery voltage (e.g., 12 V). Check the controller specs to ensure its current capacity is higher than the rated current of the solar panels (e.g., use a 20A controller for 11A solar panels).
Your inverter selection depends on the ratings of your battery and solar panel. Choose an inverter with a power rating slightly higher than your panels. In the above example, we have 750 W panels and can use a 1,000 W inverter.
Next, make sure that the inverter’s PV input voltage matches the voltage of the solar panel (e.g., 36 V), and the battery input voltage matches the voltage rating of your battery (e.g., 12 V).
You can buy an inverter with integrated ports and connect your appliances directly to the inverter, for ease of use.
For small systems like the one we are designing, cable size is not a big concern. You can choose to use a general, 4 mm cable for all your connections.
For larger systems, correct cable sizes are essential to ensure safe and optimum performance. In that case, make sure to use an online cable size guide.
By this point, you will have all the correctly sized equipment. This brings you to the final step — installation. Installing a solar power system is not complicated. Most modern equipment comes with ready-made ports and connectors so it’s easy to connect the components.
When connecting the components, follow the wiring diagram shown below. This will ensure that the power flows in the correct sequence and direction.
Going solar does not mean you must hire a team and spend thousands. If you are installing a simple, small off-grid unit, you can do it yourself with a little math and some basic electrical knowledge.
Alternatively, you can also choose a portable solar system, which uses a device that combines the battery, inverter, and other electronics into a single unit. All you need to do is plug your solar panels into it. This option is slightly more expensive, but is also the simplest.
Aniket Bhor has an M.S. in Renewable Energies and about a decade of experience working in the solar power industry — overseeing solar panel manufacturing and installations. He has written for renewable energy organizations worldwide, and is a climate enthusiast and avid cyclist.
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