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Can I go off-grid with solar plus battery?

Technically, yes – but practically, no. Or at least not yet. Batteries which are built to store solar energy are not currently designed to allow you to go off grid. To be fully self-sufficient and disconnect from the grid entirely, your solar PV and battery system size would generally need to much larger to ensure it works properly across all seasons. Even then, you would also need a back-up diesel generator.

You would need a much larger battery to give you enough battery charge when there is not much sunshine over a few days. If you don’t live near the grid, it could be more economical to install a stand-alone power system rather than pay for a cable to connect to the network. This typically has a larger solar PV system, with a much larger battery capacity and back-up diesel generator.