What is the effect of on-grid PV systems, in terms of quality, voltage and stability? I'm not really sure how to answer this. Stability -- If consumer is tied to a PV power plant, grid stability could potentially be an issue. However, generally speaking, on-grid systems use the grid like a battery back-up, so in some senses they are more stable than off-grid systems. Voltage -- Can be lossed from grid to home. Voltage lost in cables. Quality -- The constant need to potentially have energy coming from the grid to the home could wear out the components in the PV system. PV itself is intermittent / variable and depends on weather conditions. I read something else about reactive power but the concept was a little difficult to understand. Is there anything I'm missing in terms of the quality, stability and voltage effects of PV on-grid?