File Name: calculation of solar panel and battery .zip
Air Resource Specialists, Inc.
Solar battery sizing otherwise known as battery bank sizing is one of the most important considerations when choosing the specifics of your solar electric system. The main objective when sizing a battery bank is to get one that can handle the load coming from your PV panel array and provide enough stored power for your needs without having to regularly discharge to an unhealthy point.
If you are designing a solar electricity system and don't have access to the grid, you are going to have to deal with solar batteries. After having decided which type of battery to use, it will be time to size your system. During this step you are going to encounter a little math. In general the system should be big enough to supply all your energy needs for a few cloudy days but still small enough to be charged by your solar panels.
Here are the steps to sizing your system. To determine the inverter size we must find the peak load or maximum wattage of your home. This is found by adding up the wattage of the appliances and devices that could be run at the same time. Include everything from microwaves and lights to computers and clocks. The sum will tell you which inverter size you need. Don't forget that some appliances take more than their rated power at start-up.
The inverter's surge rating should cover these temporary increases. Next find the energy the home uses in a day. Figure out how long each electronic device will be run in hours per day. Multiply the wattage of each device by its run-time to get the energy in watt-hours per day. Add up all the watt-hour values to get a total for your home. This estimate is likely too low as there will be efficiency loses. To get a rough idea of the real value with system loses, multiply by 1.
This will help account for decreasing performance when temperature increases. Now decide how many days worth of energy you want to store in your battery bank. Generally this is anywhere from two to five.
Finally we can calculate the minimum battery AH capacity. Take the watt-hours per day and multiply them by the number you decided upon in step 3. Therefore multiply by 2 and convert the kwh result into amp hours AH. This is done by dividing by the battery voltage. Charge controller sizing is the next step when sizing your system. As you have probably not yet encountered these components we will briefly discuss them.
Charge controllers regulate the power coming from the solar panels to the batteries. They are a key part of any off-grid system and prevent batteries from over-charging.
This is because PWM controllers do not optimize the voltage going to the batteries. This limitation makes a PWM controller a poor choice for a large system. However, in smaller systems their low price makes them a viable option. MPPT Maximum Power Point Tracking controllers optimize the voltage coming from the solar panels so that the maximum amount of energy is transferred to the battery bank.
The maximum power point, or the optimal conversion voltage, will fluctuate with changes in light intensity, temperature and other factors. The digital optimization process performed by the MPPT controller find and adjusts to the maximum power point quickly. Sophisticated electronics are needed in MPPT controllers to do this, which explains their high price.
Once you have sized your battery bank and solar panel array, determining which charge controller to use is comparatively straight forward. Take the power produced by the solar panels and divide by the voltage of the batteries. For example:. Wiring is going to play a major role in determining the number of batteries you need. The goal, in this final step, is to produce target AH and voltage. There are two methods of wiring components in a circuit: parallel and series.
In the following diagrams blue batteries are in parallel, red batteries are in series. In a series configuration the battery voltages add up while in parallel, current adds up. Series and parallel connections can be combined to produce the voltage and AH that you require. Just remember:. We would like to mention that parallel connections are to be minimized as they can decrease battery life.
If a used battery is connected in parallel to a new one, it will degrade the fresher battery and the lifespan of the whole system will decrease. This characteristic has made some conclude that an ideal battery bank would consist of a long line of batteries connected in series. Unfortunately this is not always possible due to voltage and AH requirements of a system. As we mentioned earlier it is not always easy to find out how many batteries you need to power your home.
This is because wiring configurations have a huge impact on the output of a battery bank. So always design your storage system before you buy any components! Example: A room has two 60 watt light bulbs and a watt desktop computer.
Example: Light bulbs run for 5 hours a day. Computer runs for 2 hours a day. Battery bank capacity Finally we can calculate the minimum battery AH capacity.
Example: You want the battery bank to last three days without recharging and you use 1. Converting this to AH we have to divide by the voltage of your system. This can be 12, 24 or 48 for commercial application. Now if you divide by your battery's rating you find the number of batteries you must use.
Careful, this only applies to certain wiring setups. Overview Charge controllers regulate the power coming from the solar panels to the batteries. Calculation Once you have sized your battery bank and solar panel array, determining which charge controller to use is comparatively straight forward.
For example: Example: A solar array is producing 1 kw and charging a battery bank of 24V. Introduce a safety factor by multiplying the value you have found by 1. Battery wiring - putting it all together Wiring is going to play a major role in determining the number of batteries you need.
If you are designing a solar electricity system and don't have access to the grid, you are going to have to deal with solar batteries. After having decided which type of battery to use, it will be time to size your system. During this step you are going to encounter a little math. In general the system should be big enough to supply all your energy needs for a few cloudy days but still small enough to be charged by your solar panels. Here are the steps to sizing your system.
The following post explains through calculations how to select and interface the solar panel, inverter and charger controller combinations correctly, for acquiring the most optimal results from the set up. For the sake of convenience, let's believe you possess a a watt appliance or load that you would like to operate, free of charge through solar power, for around ten hours every night. In order to exactly determine the dimensions of the solar panel, batteries, charge controller and inverter the following mentioned parameters will need to be strictly calculated and configured.
How many solar panels do you need to provide the energy to support your home and family? This is the first thing to look at. It forms the basis for your solar energy production goals. Then, if you have them, go look at your rates from five and ten years ago. Your solar panels will produce consistent power for over 20 years.
Written by qualified solar engineer Leonardo. Last updated: November 8, A home that consumes 1, kWh per month will normally need between 20 and 30 solar panels. The exact number changes depending on the specifications of the chosen panel model, as well as the sunshine available at the project site. Before purchasing a solar energy system for your home, an important step is finding out how many solar panels you need.
Anyone who follow the step below can install and connect solar panels in home. If you pick this article related to solar panel installation, You will be able to;. To the point, lets know how to wire and install a solar panel system according to the proper calculation and load requirements. Now lets begin,. Suppose, we are going to install a solar power system in our home for a total load of W where the required backup time of battery is 3 hours You may use it your own as it is just for sample calculation.
Может быть, можно взглянуть? - Он встал и начал обходить круг терминалов, двигаясь по направлению к. Сьюзан понимала, что сегодня любопытство Хейла может привести к большим неприятностям, поэтому быстро приняла решение. - Это диагностика, - сказала она, взяв на вооружение версию коммандера. Хейл остановился: - Диагностика? - В голосе его слышалось недоверие. - Ты тратишь на это субботу, вместо того чтобы развлекаться с профессором. - Его зовут Дэвид. - Какая разница?.
Нет. Только мы трое. Было ужасно жарко.