Power optimizers
An optimizer is a DC-DC converter connected to each module (or to a pair) that always makes it work at its maximum power point.
What changes in the calculation
- Shading: the shading of one module no longer limits the others in its string. This is their main advantage on roofs with partial shading.
- Mismatch loss: it disappears, because each module works at its MPP.
- Optimizer efficiency: it appears as a small loss (99 % by default; that of the chosen device if you know it).
- Cost: each unit adds to CAPEX (€35 per unit by default, editable).
Optimizer data
Maximum input power, MPPT voltage range, maximum input voltage and current, short-circuit current, output voltage and current, maximum and European efficiency, number of inputs, mode (for example, buck or buck-boost) and price. There is no standard file equivalent to .PAN or .OND, so they are added from the datasheet.
When they pay off
| Situation | Optimizers? |
|---|---|
| Unshaded roof, a single plane | Usually not |
| Partial shading (chimneys, trees, buildings) | Probably yes: compare the scenario |
| Several orientations on the same MPPT | May pay off compared with splitting into MPPTs |
| Client who wants module-level monitoring | Yes (for reasons other than yield) |
Test it with the scenario comparator: simulate with and without optimizers and compare energy, CAPEX and NPV.
Where to enable it
In 4 · Design → Equipment (optimizer option), and it is reflected in the placement and the losses. See also Objects and shading model.
Is something missing or wrong? Write to us at hola@radiaris.com. Last reviewed: 26 October 2026.