Solar without a battery

Net metering already does part of a battery’s job

A battery’s financial argument is that it lets you use your own midday production in the evening instead of buying power. Under net metering, exported energy already offsets later consumption in kilowatt-hour terms. The grid is performing the time-shift, and it is not charging you for the hardware.

That is why, where full net metering applies, adding a battery usually improves resilience rather than payback. It is a legitimate purchase — it is just an honest description of what you are buying.

Who should still add storage

• Anyone for whom an extended outage is a safety issue rather than an inconvenience — medical equipment, heat vulnerability, a well pump for water.
• Households in areas with frequent or lengthy outages, where the resilience value is realised often rather than rarely.
• Customers of utilities whose net-metering terms are less generous, which changes the arithmetic materially.
• Anyone who would otherwise buy and maintain a standby generator, where the comparison is battery against generator rather than battery against nothing.

Keeping the option open

If you are unsure, the cheapest hedge is to design the solar installation so a battery can be added later without rework. That mainly means choosing equipment with a sensible storage path and leaving physical and electrical space for it.

Adding storage later always costs more than doing it at the same time, because the electrical work, permitting and interconnection happen twice. But an informed retrofit is far better than buying capacity you never wanted.