How lengthy do solar inverters final for personal households? – pv journal Worldwide – pv journal Worldwide

From PV magazine USA

In the first part of this series, PV magazine checked the Productive life of solar panelsthat are quite resilient. In this part we examine residential solar inverters in their various forms and consider their resilience and lifespan.

The inverter, a device that converts the direct current generated by solar panels into usable alternating current, can come in a variety of configurations.

String inverters vs. microinverters Image: Solar Reviews

The two main types of inverters in residential applications are string inverters and microinverters. In some applications, string inverters are equipped with power electronics at module level (MLPE) or DC optimizers. Microinverters and DC optimizers are generally used for roofs with shading conditions or sub-optimal orientation (not facing south).

String inverters with DC optimizers
Image: Solar Reviews

The technology ensures that each panel produces its maximum output in real time and is not limited to the weakest link in the chain or "string". String inverters are subject to the “Christmas light” effect, in which if a panel does not work or is shaded, the remaining panels connected in series are limited to the production volume of that panel.

While this doesn't seem to have a reason for a string inverter, it isn't always the case. In applications where the roof has a preferred azimuth (orientation to the sun) and little or no shading problems, a string inverter can be a good solution.

In a string inverter, there are fewer moving parts to break, less complicated wiring, and a central location for simple repairs for solar technicians. Usually they are less expensive, said solar reviews. It is said that inverters can typically cost 10 to 20% of the total solar panel installation, so choosing the right one is important.

How long do they take?

While solar panels can last 25 to 30 years or more, inverters generally have a shorter lifespan due to more complex moving components.

Energy saga called that a typical centralized string inverter for private households will last about 10 to 15 years and must therefore be replaced at some point during the life of the modules. String inverters in general have Standard warranties range from five to 10 years, and many have the option to extend to 20 years. Some solar contracts include free maintenance and monitoring throughout the contract period, so it is advisable to take this into account when choosing inverters.

Microinverters installed at panel level Image: Enphase

Microinverters have a longer lifespan. EnergySage said they can often last 25 years – almost as long as their panel counterparts. As a rule, these inverters come with a standard guarantee of 20 to 25 years.

The same applies to DC optimizers, which are typically paired with a central string inverter. These components last 20 to 25 years and are guaranteed for this period.