How to choose the right on grid solar inverter?

31 Aug 2021

The Solar Inverter is an integral part of the entire power system for both Grid Connect and Off Grid solar solutions. The difference in function between Grid Connect and Off Grid solar inverters are significant, as such we will only be discussing On Grid Solar inverters.

Decision #1: Is efficiency really that important?

An inverter’s efficiency is all about the power it takes from the solar panels, and converts into usable AC power. An efficient inverter reduces the loss of energy that usually happens while receiving DC from the solar panels.

An efficiency of 50% indicates that the inverter is using very less amount of power. On the other hand, an efficiency of 90% denotes maximum utilization of energy, and which is considered to be the inverter’s rated output. In the recent times, the efficiency of the on-grid inverter is more than 98%.

Most of the solar grid-tie inverter manufacturers offer a peak efficiency value. Peak efficiency value is the highest efficiency that the inverter can achieve.

Decision #2: Should we really think about the IP rating?

Inverters are subject to harsh natural elements such as water, dirt, dust, high temperatures, low temperatures, fluctuating voltages, etc. Also needs to check and ensure the inverter can withstand harsh environmental phenomenon or not. It is advisable to ensure minimum of IP65 rating of inverter should be used. Also, if the inverter will be installed near to a sea/river coast, then take care the inverter should be coated with salt resistance material for more protection and longer life span.

EverExceed SSB Series inverters are compatible with IP65 rating.

Decision #3: Should we be concerned about installation?

Try to select the grid tie string inverter with simple and easy installation, the inverter should have brackets and all accessories to assist only one person to install. It will be great if the inverter can be installed behind the string modules, so can reduce connection cable length, and save some costs. Also, if the string inverter can be wired via single MC4 to be something like plug and play installation. Just we need to streamline installation process so reduce time and cost. Also, during installation need to keep in mind for the future expansion, so that the expansion can be done with ease.

Decision #4: Is the DC input voltage much that important?

This is the voltage range that the inverter will accept from the PV array. Local climate data and temperature coefficients will determine the maximum and minimum expected voltages. Exceeding the maximum voltage specification of an inverter may cause damage or fire in a worst scenario; and while it is not dangerous, too low array voltage can cause the inverter to stop processing power.

Decision #5: Why AC output power should be considered?

The inverter’s AC output power should be matched to the PV array. A PV array’s Standard Test Conditions (STC) power rating will provide a good idea of the minimum size of the needed inverter.

For instance, a 5 kW PV array will require an inverter with about a 5 kW power output. If the climate interferes with the array preventing it from reaching STC power, it is possible to “undersize” the inverter by 10 to 20%. In that case, under-sizing would need a 4 to 4.5 kW inverter for that 5 kW PV array. The inverter may require ‘over-sizing’ for arrays in higher elevated areas which are colder and sunnier; this is to avoid power clipping. In addition, a larger inverter can capture random moments of high PV output, such as those from cold, sunny days or from ‘edge-of-cloud’ effect and possibly leave room for future expansion.

EverExceed SSB Series inverters are manufactured keeping all of those factors precisely, which ensures high efficiency with reliable performance.

If you want to know more about EverExceed On-Grid Inverters, contact EverExceed today. Our team is experienced for more than a decade on the industry to provide you best solution for your needs.

tags :