What does 'DC Voltage Too Low' mean in the Enphase app?

Short answer

Enphase 'DC Voltage Too Low' means a microinverter is getting too little voltage from its panel. It's normal at dawn, dusk and in dull spells. If one panel shows it all day in good sun, the likely causes are a loose or damaged DC connector, reversed polarity, an incompatible module or a failed panel, so ask your installer to check.