Solar panels produce direct current (DC). Your home runs on alternating current (AC). The inverter bridges that gap, converting the panel output into usable power. It also handles grid synchronization, safety shutoffs, and in most modern systems, production monitoring.
There are three main types. A string inverter is a single box mounted on your wall that handles all panels together. It’s the most common and least expensive option, but one shaded or underperforming panel drags down the whole string. Microinverters are small units mounted behind each panel individually, so each panel operates independently. They cost more but perform better on roofs with partial shade or complex angles. Power optimizers are a middle option: panel-level devices that condition the DC output before sending it to a central string inverter. Most NC installers default to string inverters for simple roof configurations and recommend microinverters when shading is a concern.
When you’re getting quotes
Ask what inverter brand and type is included, and check the warranty. String inverters typically carry 10–12 year warranties; microinverters often come with 25 years. Also ask whether the inverter is compatible with battery storage if you plan to add a battery later. Not all string inverters support battery integration without a second piece of hardware.
Common questions
- What type of solar inverter is best for homes in Raleigh and Charlotte?
- String inverters are the default choice for simple roof configurations with good sun exposure and minimal shading. They're reliable and cost less than microinverters. Microinverters are worth the extra cost when your roof has multiple orientations, dormers, chimneys, or nearby trees that cast partial shade — common in established neighborhoods in both cities. Your installer should assess shading on-site before recommending one over the other.
- How long does a solar inverter last?
- String inverters typically last 10–15 years and carry 10–12 year warranties from major brands. Microinverters are designed to last 25 years and most come with 25-year warranties. Since a solar system is often warranted for 25 years, factor in a string inverter replacement at roughly the midpoint — add $1,000–$2,000 to your long-term cost estimate.
- Is my solar inverter compatible with adding a battery later?
- Not always. Some string inverters require a separate battery interface device to work with storage, which adds cost. Others are hybrid inverters that support battery integration natively. Microinverter systems (Enphase, primarily) use a separate battery system that works alongside the microinverters. If you're planning to add storage within the next few years, tell your installer upfront so they can spec an inverter that makes the addition straightforward.