WHAT SIZES OF SOLAR PANELS DO I NEED FOR MY HOUSE?
The size of the solar panel system you need for your house depends on several factors, including your energy consumption, location, available roof space, and budget. Here are the steps to help you determine the right size for your solar panel system:
- Calculate Your Average Monthly Electricity Consumption: Look at your electricity bills for the past year to determine your average monthly consumption in kilowatt-hours (kWh). This will give you an idea of how much electricity you use.
Let’s first show you what a solar system produces:
Daily sun hour 4.5 [Hr] (In Philippines)
Efficiency total system 80 [%]
Capacity panel [W]
For a 500-watt panel, we can calculate an average expected daily production of:
4.5 x 0.8 x 500 = 1,800 [Wh] per day
1,800 x 30.5 = 54,900 [Wh] per month
1,800 x 365 = 657,000 [Wh] per year
- Consider Your Location: Your location plays a crucial role in solar panel efficiency. The amount of sunlight your area receives throughout the year affects the size of the system you’ll need. You can use online tools or consult with a solar installer to estimate the solar potential in your area.
- Determine Your Desired Energy Offset: Decide how much of your electricity bill you want to offset with solar power. Some homeowners aim to cover 100% of their electricity usage, while others opt for a smaller percentage.
These are conservative amounts; normally the efficiency of a solar installation is higher.
The easy way is now to compare these amounts to your kW consumption shown on your electrical bill. If you consume 750,000 kW then your solar needs are:
(750,000 / 54,900) = 13,66 panels of 500 Watt roughly 15 panels of 500 Watt is a 7.5 kW installation.
But sorry… This calculation is too easy to be true!
There are many variables to consider:
- Do you consume your power in the day or mainly in the night?
- What is the objective? Savings? Zero billing? Brown out protection? A combination of all of these? Fastest Return of investment?
- Is there shading, what is the available size to install solar?
- What is the budget available?
- Are the government incentives?
- What is your monthly electrical bill
- Do you own your house or is it rental?
These are only a few of the variables. In the design stage, the solar installer becomes important. If he uses buying pressure tactics without informing you of your best sizing or estimated expected production, you’ve got the wrong guy.
- Calculate System Size: To estimate the size of your solar panel system in kilowatts (kW), divide your desired energy offset by the annual solar production per kW in your area. On average, a 1 kW solar panel system can produce around 1,500 to 2,000 kWh of electricity per year, but this varies by location.
System Size (kW) = Desired Energy Offset (kWh/year) / Annual Solar Production per kW (kWh/year) - Evaluate Available Roof Space: Check the available roof space to ensure it can accommodate the required number of solar panels. Solar panels typically come in standard sizes (e.g., 60-cell or 72-cell panels), and the number you need will depend on their wattage and efficiency.
- Consult a Solar Installer: It’s highly recommended to consult with a professional solar installer. They can perform a free site assessment, consider all the factors specific to your location and property, and provide you with an accurate system size recommendation.
Asking solar companies for their best sizing, comparing notes, etc. serves two purposes. You will get more than one opinion on the best size, and it helps you filter out “fly-by” installers from the genuine ones. check out https://solana4u.ph
Remember that it’s not always necessary to cover 100% of your electricity needs with solar panels. Some homeowners opt for smaller systems to start and expand later. Additionally, energy-efficient practices and appliances can help reduce your overall electricity consumption, which can impact the size of the solar panel system you need.
Keywords: system size, annual consumption, day time consumption.
