For home solar goers, the most important thing is to install a system that performs very well and helps reduce the entire electricity bill. Thus, optimizing the power generating system is by all means necessary, and sizing the solar inverter that works for the system is one of the best choices, for a solar inverter works to convert the direct current from solar panels into alternating current, which is used to power all the appliances of a house.
Before deciding to calculate the size of the inverter for the system, you have two important things to consider: the total watts of all the appliances, which indicate the amount of electricity required by the setup, and the total units because they decide how much electricity can be used each day.
Besides this, today’s home solar systems can be generally divided into three types: standalone, grid-tie and battery backup systems. Different systems require different types of solar inverter installations.
Sizing an inverter for a solar power system is closely connected to the total watts of the family’s total appliances. The input rating of the converting device you use cannot be lower than the entire watts of these appliances. If you have fridges or pumps connected, you need to take serious notice of this advice. At the same time the size of the device should also match the watt of the solar panels installed on your rooftop. If it is in a standalone system, where batteries are used for the sake of storing direct current for required use, its nominal input voltage should be the same as that of the batteries.
Although you have learned the basic knowledge of sizing an inverter, you still need to be clear of the effects of under-sizing and over-sizing, because people who wish to go solar may meet these problems, which will influence the ultimate performance of your solar power system.
Simply put, a too big inverter can cost more of your budget, while a too small one cannot meet your required amount. In detail, the alternating current output is decided by the converting device not by the output direct current amount from the solar panels. If the solar inverter is not big enough, some direct current will be wasted in the converting process. On the other hand under-sizing an inverter can overheat the parts used in the system and make their lifespans become short. If it is over-sized, the whole system’s efficiency will be decided by the average point of operation. Therefore, its efficiency will shrink according to how much you have over-sized your device. Also, if you wish to add more solar panels, the system’s total performance will discount too.
Apart from sizing solar inverters, sizing solar panels and batteries also needs deep concerns, and this can make your system work better too. But these knowledge and experience cannot be absorbed in one day, and they need a long time practice and careful calculation.
I am an editor for Omnik New Energy, specializing in writing articles about solar inverter manufacturers, solar energy, PV inverters and micro inverters. Solar energy has been used worldwide and is helping us improve our living standards and protect the environment. It is time to go solar.