Selection

Unit and panel

The watt number on the label doesn't decide. Your unit's MPPT window and the panel's Voc/Vmp profile do — here are the selection articles.

If you want to know how to calculate cold Voc, or why the 400 W label isn't enough: registration brings new materials and calculators.

Registration Calculators

The label says 1800 W AC and "1000 W solar" — but for the solar input, the voltage window and A/port decide. Filter like this.

The panel label says 400 W. Your device's MPPT window decides whether this panel can be connected safely — and how many go in series.