When you use solar products in our daily, then there is something you need to know whether you need to install the solar system or not. For example, many customers from our store will ask our engineer many questions about the solar products, for example, how to install the solar system and why I cannot get enough power when I use the solar inverter at my home. Here, in this post, I would like to introduce another question, this is: “How much solar power do I need?” In fact, it is hard to answer this question. Most people approach it from the wrong angle when they start to look into solar.
Of course, there is something you can do to solve this question. If you want to run through calculations yourself to determine the size of the solar power system you should get for your specific circumstances, you’ll want to figure out the main constraints on the project and use those restrictions as the starting point for the design. You can approach the project from two angles:
1) How much money you’re prepared to spend.
2) How much electricity your household uses.
Take into consideration other sizing factors and common stumbling blocks that may impact how to size a solar system:
1) Local levels of sun exposure
2) Orientation of the array (tilt angle)
3) Plans for future expansion
Before you begin to size a solar system, follow these steps to determine your home’s average electricity consumption and PV needs:
1. Calculate Your kWh Usage
1) Gather the kilowatt-hours (kWh) usage from your electric bill. We will assume it is quarterly. Look at how many kWh’s you have used in the previous 4 quarters. The information will be on your bill–look for usage over time and add up the last 4 quarters. That is how many kWh’s of electricity you use per year. Let’s imagine you use 6250 kWh per year.
2) Figure your daily kWh usage. Divide your [annual kWh’s] by 365. That is your daily usage. In this example it comes out as 17kWh’s per day.
2. Look Up Your Peak Sun Hours
Average peak sun hours vary greatly depending on your location and local climate. You’ll want to determine how may peak hours of sunlight you’ll get so you can make the most of the solar power:
1) Look up your peak sun hours, through the sun hours chart below to determine the number of hours per day the sun produces peak sunlight.
2) Find the nearest city to you and write down the daily average of peak sun hours.
3. Calculate the Watts of Your Solar System
To figure out how much solar panel you need, take your daily kWh energy requirement and divide it by your peak sun hours to get the kW output. Then divide the kW output by your panel’s efficiency to get the estimated number of solar panels you’ll need for your system.
(Daily kWh ÷ average sun hours) x 1.15 efficiency factor = DC solar system size
For example, if you live in Florida, you average 4.5 peak sunlight hours per day and you need 17kWh DC per day.
(17 kWh ÷ 4.5 sun hours) x 1.15 efficiency factor = 4.3 kW DC solar system size required
Using the example above with a 4.3 kW DC system, you can multiply this number by 1,000 to confirm that you need how many watts of solar system.
4.3 kWh x 1000 (convert to watts) = 4300 watts solar panel required
Powmr offers high performing solar panel kits and dependable customer service. Here are a few viable options to consider after you size a solar system.
Of course, if all this talk of calculation is totally confusing you, then we suggest that you can contact us using email or LiveChat. This will allow you to talk directly to an expert who can explain all the ins and outs of system sizing with you and recommend how big a solar power system and how many solar panels you’ll need based on your requirements and circumstances.
Appliance Consumption Table
Band Saw – 14″
Belt Sander – 3″
Chain Saw – 12″
TV – LCD
Circular Saw – 7-1/4″
TV – Plasma
Circular Saw 8-1/4″
Freezer – Upright – 15 cu. ft.
Disc Sander – 9″
Freezer – Chest – 15 cu. ft.
Drill – 1/4″
Fridge – 20 cu. ft. (AC)
Video Game Console
Drill – 1/2″
Fridge -16 cu. ft. (AC)
Drill – 1″
CFL Bulb – 40 Watt Equivalent
Kettle – Electric
CFL Bulb – 60 Watt Equivalent
CFL Bulb – 75 Watt Equivalent
Oven – Electric
CFL Bulb – 100 Watt Equivalent
Compact Fluorescent 20 Watt
Compact Fluorescent 25 Watt
Halogen – 40 Watt
Incandescent 50 Watt
Incandescent 100 Watt
LED Bulb – 40 Watt Equivalent
Central Air Conditioner – 24,000 BTU NA
LED Bulb – 60 Watt Equivalent
Radiotelephone – Receive
Central Air Conditioner – 10,000 BTU NA
LED Bulb – 75 watt equivalent
Radiotelephone – Transmit
Furnace Fan Blower
LED Bulb – 100 Watt Equivalent
Space Heater NA
Tankless Water Heater – Electric
Desktop Computer (Standard)
Note: TVs, Computers, and other devices left plugged in but not turned on still draw power.
**To estimate the number of hours that a refrigerator actually operates at its maximum wattage, divide the total time the refrigerator is plugged in by three. Refrigerators, although turned “on” all the time, actually cycle on and off as needed to maintain interior temperatures.
Water Heater – Electric
Desktop Computer (Gaming)
Window Air Conditioner 10,000 BTU NA
Window Air Conditioner 12,000 BTU NA
Well Pump – 1/3 1HP
Clothes Dryer – Electric
Clothes Dryer – Gas
Smart Phone – Recharge
Tablet – Recharge