Plan inverters and micro-inverters

Stringing starts with the inverter. You add the inverter first, then group the placed modules into strings and assign each string to one of the inverter's MPP trackers. Microinverters are the alternative, with no MPP-tracker grouping to manage. The full module-by-module stringing walkthrough lives on Plan PV modules. This page covers the inverter side.

Before you start

• Place your modules first. Strings are built from modules already on the roof. If the roof is empty, go back to module placement.
• Know which inverter model you're using and how many MPP trackers it has. Inverters come from your components catalog.
• For a microinverter system, have the microinverter component selected. The flow is different (see Use microinverters instead below).

Add an inverter

1. Switch to Strings mode in the top toolbar.
2. In the sidebar, click Add Inverter.
3. Pick an inverter from your components catalog. (The modal is a component picker: there's no name field at this step, so the inverter is created with a blank name.)
4. The inverter appears in the right sidebar with its MPP tracker slots empty. To name it (such as Main Inverter — South Roof), open the inverter's detail panel and edit the name there.

Assign strings to MPP trackers

Each inverter has one or more MPP (maximum-power-point) trackers. The tracker runs every module on its string at a single operating point, so a shaded or differently-angled panel drags the rest of the string down.

1. Create or select a string in the 3D scene.
2. In the inverter's panel, click an empty MPP tracker slot and drag the string into it.
3. Alternatively, open the string's detail panel and assign it to an inverter plus MPP tracker there.
4. Keep modules on the same string aligned in orientation and shading so the tracker isn't held back by one weak panel.

Use microinverters instead

Microinverters skip the MPP-tracker structure entirely. Each panel runs at its own operating point, with nothing to group into strings.

1. In the components catalog, some inverter components are tagged as microinverters. Check the component's specification to confirm it's a microinverter and not a standard inverter before you wire.
2. Place your modules first.
3. Add the microinverters. The add-microinverter action places one microinverter per panel group, grouped from the placed layout, not one per individual module. A roof side filled as a single panel group gets one microinverter covering that group; a layout with several panel groups gets one per group.
4. For a finer split, closer to one microinverter per module, lay the modules out in the panel groups you want first, then add the microinverters. The action follows your panel groups.

Things to know

• The current-limit warning helps you rebalance. When a string's total current exceeds the inverter's limit, Reonic shows a warning inline on the affected MPP tracker. Read it, then rebalance the string to clear it.
• MPP voltage reads correctly when several strings share a tracker. Strings on the same MPP tracker are wired in parallel, so they share voltage rather than adding it. The inverter detail overlay reports the maximum across the parallel strings, matching the 2D wiring view.
• Inverter sizing. If you provision more module wattage than the inverter can handle, the simulation caps the output. Use the catalog inverter specs to size correctly.
• Hybrid inverters with integrated storage come from the components catalog. Pick the matching component and the storage is modelled with it.
• Wiring locks after signature, like the rest of the plan.

Last updated on September 30, 2026