Microinverters, power optimizers, and solar power

Jason RothmanJune 25, 2018 1327 0

Microinverters, power optimizers, and solar power

Microinverters and power optimizers are the new darlings in the solar panel industry. They came along and allowed us to change how we configure solar panels on our roofs. Before we had to have everything in a line and if one panel was shaded, it influenced the performance of the whole system. Now with microinverters, you can place panels in different locations, and the efficiency of one panel does not influence the efficiency of the other panels.

What is a Micro Inverter? 

A microinverter function in a parallel circuit. To simply put, a standard inverter will cap the electricity production of each panel by the lowest producing panel on your roof. A micro-inverter, on the other hand, will take full advantage of the production of each individual panel. It will convert the power generated by each panel to the grid voltage.

Advantages of  microinverters and optimizers

The core advantage of using microinverters is that theoretically, you can yield more solar electricity. The reason for this is that there are slight differences in voltages between solar panels. When solar panels are in a string the voltage is reduced to the voltage of the lowest voltage panel in the string.

If a solar system is facing multiple angles then micro-inverters are the way to go. Or, if you have shading issues from trees or a large chimney, again micro-inverters would be best. In these situations, the solar panels will be producing different amounts of electricity at different times of the day, but micro-inverters will ensure you harvest all of the energy,

Optimizers are an option for standard inverters as well, which function very similarly to a micro-inverter. With an optimizer, you still have a standard inverter, but you also have optimizers for each individual panel combating production differences. There are other aspects to consider as well. Micro-inverters typically have 25-year warranties while standard inverters typically have 5 or 10-year warranties. Micro-inverters and the add-on optimizers both offer an additional perk in system monitoring as well. With either of these devices, you have the ability to track the production of each individual panel, while with a standard inverter you only can track the production of the whole system.

If you were to expand your system in the future, micro-inverters are simple to add one at a time. However, with a standard inverter, it would be more costly to add another full unit. To sum it all up, micro-inverters definitely add value but are only recommended if you have panels facing multiple orientations or you have shading issues. Otherwise, the less expensive standard inverter is usually more cost effective.

Disadvantages of a micro inverters

The main disadvantage of microinverters is the price. They are typically a $1000 or so more expensive than a string inverter on a standard 5kW residential solar installation. The second disadvantage is that you have as many inverters on your roof as you have solar panels.

Although microinverter manufacturers sell the ability to monitor each panel as a benefit of micro's (and it is) they then don't include the monitoring that allows the customer to do this. They only allow the installer to see the panel level data from your system and not you as a customer unless you agree to buy the higher level of monitoring as an upgrade.

This means you as a customer only see system-wide monitoring information not what is going on with each panel. A skeptic would say that the reason they do this is to protect them and their installers from support calls related to broken inverters. It is very difficult with only system-wide monitoring data to determine if only one or two inverters out of 25 or so have failed.

If you want to move into the future and join the solar revolution, or if you want to find out what solar panels are right for you, go to and try our price checker tool. You can see how much a system will cost, and how much you can save over the next 20 years.

For more information relating to going solar, don't forget to visit our solar blog section for more handy guides and articles.

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