Why the inverter matters so much Solar panels make direct current, or DC. Everything in your house runs on alternating current, or AC. The inverter is the piece that converts one into the other, so every kilowatt hour your panels make has to pass through it.
That makes the inverter one of the biggest decisions in a solar project. It affects how much power you get from a shaded or oddly shaped roof, how you monitor the system, how long parts last, and how easy it is to add a battery later. Most homeowners never think about it until something goes wrong, so it pays to understand the options up front.
There are three main setups used on homes in Denver, Castle Rock, Colorado Springs and Pueblo.
String inverters With a string inverter, panels are wired together in groups called strings. All of that DC power runs to one central inverter, usually mounted on a wall in the garage or on the side of the house.
Where they work well
Simple roofs with one or two large, unshaded faces
Homes where every panel points the same direction
Projects where keeping the upfront cost down is the top priority
The tradeoffs
Panels in a string act a bit like a chain. If one panel is shaded by a chimney, a tree or a patch of snow, it can pull down the output of every panel in that string. Monitoring is usually at the system level, so it is harder to see if one panel is underperforming. Central inverters also tend to wear out before the panels do and usually carry shorter warranties.
Microinverters Microinverters are small inverters mounted under each panel. Every panel converts its own power to AC right on the roof and works independently of the others.
Where they work well
Roofs with several faces pointing different directions
Homes with partial shade from trees, chimneys or neighboring buildings
Owners who want to see production for each panel in an app
Systems that may grow later, since adding panels is simpler
The tradeoffs
Microinverters usually cost more upfront. Because the electronics sit on the roof, a failed unit means a service visit to reach it. In exchange, they often come with long warranties, and a problem with one unit only affects one panel.
Power optimizers Power optimizers are a middle ground. A small device sits under each panel and fine tunes its output, then the power still feeds a central inverter on the wall.
Where they work well
Roofs with some shading or more than one direction
Owners who want panel level monitoring at a lower cost than full microinverters
Homes planning to add battery storage with a compatible inverter
The tradeoffs
You still have a central inverter that may need replacing before the panels do. There are also more components in the system overall, which means more parts that can eventually need service.
How Colorado conditions factor in The Front Range is a great place for solar. We get a lot of sunny days, and panels actually run more efficiently in cool, clear weather. A few local conditions still shape the inverter choice.
Snow. After a storm, snow slides off some panels faster than others. With a string inverter, a few covered panels can slow the whole string. Microinverters and optimizers let the clear panels keep producing at full strength.
Complex rooflines. Many homes in Castle Rock, Highlands Ranch and Colorado Springs have multiple roof planes and dormers. Panel level electronics handle these layouts better.
Trees. Older neighborhoods in Denver and Pueblo often have mature trees that shade part of the roof during certain hours. Shade is where microinverters and optimizers earn their keep.
Heat on the roof. Summer roofs get hot, and electronics mounted there have to handle it. Quality equipment is rated for this, which is one reason the brand and installer matter.
Quick comparison
String inverter
Microinverters
Power optimizers
Handles shade
Weak
Strong
Strong
Panel level monitoring
Usually no
Yes
Yes
Upfront cost
Lowest
Highest
Middle
Where electronics sit
Wall
Roof
Roof and wall
Battery ready
Often needs a compatible or added inverter
Works with compatible batteries
Often pairs with a compatible battery inverter
Which one is right for your home? There is no single best answer. A simple south facing roof with no shade may do great with a string inverter. A home with trees, dormers and panels facing east and west will usually get more power out of microinverters or optimizers. Your budget and whether you want a battery now or later also play a part.
Impact Energy & Roofing installs systems using SolarEdge and Enphase equipment, and we design each system around your actual roof, shade and energy use. Because we handle both roofing and solar, we also look at the condition of the roof before anything goes on it.
If you are planning solar in Denver, Castle Rock, Colorado Springs or Pueblo, call Impact Energy & Roofing for a consultation and a system designed for your home.