Solar and storage are often sold together, but they do different jobs. Understanding the difference is the quickest way to tell whether a battery belongs in your system now, later, or not at all.
Solar generates
An array produces energy while the sun is up. It is most valuable when the property can use that energy as it is produced, daytime loads such as hot water, heat pumps, pool pumps or an EV charging at home.
A battery shifts
A battery generates nothing. It stores surplus from the middle of the day and releases it later, usually in the evening when generation has dropped and household demand rises. It can also be configured to supply selected circuits during an outage, if the inverter and wiring are designed for backup.
When storage makes sense
- Regular daytime surplus with little use for it
- Evening demand is high relative to daytime
- Backup for essential circuits matters
- Export is limited or poorly valued on that connection
When it may not
If someone is home through the day and most generation is already used on site, there may be little surplus to store. In that case a larger array or a change in when loads run can be the better first step. Designing the inverter and switchboard so a battery can be added later keeps the option open.
