In the market you will find many numbers of companies that provide solar components, and for each solar professional, you can take advice from, his certain recommended products, and each solar professional will provide very convincing reasons standing behind his choice. So which opinion you can trust, and which product is really the best?
Before implementing any type of solar systems projects, whether it is On Grid or Off Grid solar system, we need to calculate the return on investment of such project, and to be more specific, we need to calculate how much money we will harvest? In other word, how long does it take for the solar system project to pay for itself (payback period)? And what is the extra money we can get after the solar system project returned the expenditures we paid for it.
There are 8 tips to consider when selecting the proper off grid solar inverter, let us see as following.
1. The off grid solar inverter output voltage and frequency. This will base on your load requirements and usually its same as your country standard supply voltage/frequency.
2. Installing off grid solar inverter or hybrid inverter. Most of off grid solar inverters and hybrid solar inverters have AC backup supply connection, so the inverter bypass to use it for feeding your loads in case of sun absence and batteries discharged. Moreover, you can use this AC backup supply to charge the batteries through internal solar inverter batteries charger.
In order to install photovoltaic solar system in your building, you need to choose in between 2 main solar system types: On Grid and Off Grid. Which one will be the most technically suitable and cost effective as well? As an one-top online shop, inverter.com provides full range of solar inverter products to customers worldwide. On grid inverters, off grid inverters, micro inverters could be found in our shop.
Grid tie system is a solar system incorporates solar panels, grid tie solar inverter and other components to convert sun light into usable AC electricity while your house/premises remain hooked up to the electric utility, consequently your house still be fed with electricity even after the sun light disappears at the night (from the electric utility), and at the day time, the solar system will take the responsibility!
If the solar system is confirmed to be expanded in the future, micro inverters are a good choice. It is easy to continue adding a new unit to the micro inverters. The cost of adding another complete unit to a standard inverter is higher. When the panel faces multiple directions or there is a shading problem, choosing a micro inverter is definitely a value-added product.
The more the sun shines, the more DC electricity the solar panels can produce, and the more AC energy we can get. When the AC power is larger than our loads requirements, the excess electricity will send back to the electric power grid allowing other neighbors customers to use this clean solar energy. But if the AC power generated from the solar grid tie system is less than our loads requirements, then our loads will pull extra power required to run properly from the electric power grid. The 2 cases will be done automatically via the brain of the solar system which is the inverter, without any other interventions.
In string solar inverter, there will be a number of solar panels connected to each other in series, usually a number 6-10 solar panel, and generating what we called string. This string positive and negative terminals “DC” will be connected to the string inverter input side. As the panels will be connected in series, the overall string DC voltage will be high (typically 200-850V) and the circulating current will be low (equal to one solar panel rated current).
Solar inverter is the brain of the solar system, although its basic role is to convert DC electricity comes from solar panels to usable AC electricity, now it takes the responsibility to monitor and control the whole solar system and provides important technical info required for solar system operation and maintenance crews to fix system errors, in addition to that it takes responsibility to manage batteries system incase of its presence in the solar system.
Solar inverter is the heart of the solar plant, it represents the main equipment that converts DC output from solar panels to AC electricity required to run all our appliances/machines/equipment. In addition, it takes the responsibility of monitoring and controlling the PV array system.
Usually at the beginning of the day, solar inverter AC output power is low, then it increases gradually with the increasing of the sun light reaching its max at noon time (2-3pm), then it reduces gradually and reaches its lowest value at the end of the day with the sun light absence. So, it’s like a bell curve.
The solar inverter in the practical application of optimization applications, you first need to make sure that people buy an inverter is relatively high quality. Only good quality products in order to be respected by the market and is recognized by consumers. We will introduce about how manufacturers realize quality control of the solar inverter.
For large solar array you can use multiple string inverters and connect all together with one AC output for your loads. By using grid tie string inverters such way, you can make use of different tilt and azimuth angles that can be applied even for each sting, so getting maximum yield. In addition, increasing the solar array reliability as for example the shadow in one string panel will not affect the efficiency of other strings.
Smart solar inverter
It’s the link to the smart grid. The solar inverter should have high advanced communication capability with smart grid in addition to analytic, computing and memory capabilities to provide all information and control features to the smart grid energy management system.
Off grid solar system is more complex in installation than on grid solar system, as it requires more components like charge controller and batteries, so it needs higher technical skills and costs more. Although of this, off grid solar system market grows and most of suppliers / manufacturers try to save the cost and complexity by searching and implements new techniques and services that you should pay attention for as following.
Many people working in solar industry knows about MPPT acronym, but few of them understand correctly, although it is an important feature that helps us increasing solar photovoltaic energy harvest. Simply put, it is DC to DC converter incorporated inside most of all modern solar photovoltaic inverters that enable maximizing DC energy harvest getting from solar panels at any time during the operation cycle.
Off grid solar inverter converts DC electricity comes from solar panels and stored in Batteries to AC electricity to be used to run all of AC loads types existing now like TV, refrigerator, oven, lights, air conditions…etc. What are parameters to check when buying the off-grid inverter?
Today we see many solar plants connected to the power grid, and there will be more and more in near future. All experienced power system engineers, and operators see that it is a must for these solar plants to have sophisticated control system to achieve coordination and integrity between them and other traditional power plants exist in the grid. This smart control system can be done only through solar inverters which represent the brain of the solar power plant.
Today, the new frontier of solar inverters become exist everywhere, it's the smart solar inverter which has the ability to interact with the power grid. It has internal advanced software that enable performing amazing actions. The smart solar inverter is able to connect with the grid even with the presence of disturbances like voltage changes, the inverter automatically switches from operating mode to standby mode, then operating mode or even turn off if the disturbances last for long time.
Today we will introduce a home solar power system design below 10kW, which is installed on the roof of the house and connected to the grid of 220V or 380V. The maximum installation capacity is 25% of the capacity of the upper-level transformer. First of all, it is required to determine whether the load capacity of the roof can meet the requirements. The loading requirements of the solar power system equipment for the roof are greater than 30kg/m2.