Equipment and Tools Needed for a DIY Solar System
Before we talk about installing, here is a list of equipment and tools you will need:
- Solar panels: Conversion sunshine into solar power energy.
- Inverter: Make DC solar power into AC output for home appliance use
- Battery: for backup in night, or when rainy day without sunshine
- Charge controller: A charge controller improves the efficiency and safety of the battery’s charging.
- Wiring: A set of wires is needed to connect all the system components, like 4mm2/6mm2.
- Mounting racks: Although optional, mounting racks are useful for placing the solar panels at an optimal angle for power production, we have lolsolar aluminum material bracket.
- Miscellaneous items: In addition to the essential items listed above, you may need the following components to complete the system:
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- Fuses/breakers
- Connectors (note that many modern components come with integrated connectors)
- Cable ties
- Metering device (optional)
- Terminal lugs
- Tools: You will also require some easy-to-use tools to install the system.
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- Wire stripper
- Crimping tool
- Pliers
- Screwdriver
- Wrenches
How To Design a Solar Power System
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.
Sizing the Solar Panels
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 6 hours of sunlight daily, we have:
2,400 Wh ÷ 6 h = 400 W panels
Again, with some safety margin, we can use one 400-watt solar panels. These two panels will be connected in series as shown below.
Sizing the Battery and Charge Controller
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).
Choosing the Inverter
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.
Choosing the Right Cable Sizes
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.
Installing the System
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.
Name Job
Shenzhen Lolsolar New Energy Technology Co.,Ltd
Phone: +86 13279529807
Email: job.wang@lolsolar.com
Website: www.lolsolar.net