Battery Storage – Turn Your Solar Into a Power Plant
Stay powered through outages and keep your energy local
603 Solar offers whole-home solar battery storage using Enphase’s modular energy storage platform. By adding batteries to your solar system, you can maintain power during grid outages and prioritize self-consumption during normal grid operation — storing energy during the day and using it at night.
Seamless Backup Power
No transfer switches, no dimming lights, and no disruption. Enphase batteries transition nearly instantaneously during outages and allow your solar system to continue producing when the grid is down — something standard grid-tied solar cannot do on its own.
Energy Independence
With sufficient battery capacity, you can dramatically reduce or even eliminate dependence on the utility. In some cases, homeowners can operate off-grid by cycling stored solar energy, while still having the option to sell excess production back to the grid when the batteries are full.
Seamless Backup Power
No transfer switches, no dimming lights, and no disruption. Enphase batteries transition nearly instantaneously during outages and allow your solar system to continue producing when the grid is down — something standard grid-tied solar cannot do on its own.
Energy Independence
With sufficient battery capacity, you can dramatically reduce or even eliminate dependence on the utility. In some cases, homeowners can operate off-grid by cycling stored solar energy, while still having the option to sell excess production back to the grid when the batteries are full.
System Specifications (Per Enphase 10C Battery)
- 10 kWh of usable energy storage per unit
- 7.08 kVA continuous output (14.16 kVA peak)
- 29.5 A output current
- Whole-home backup capable
- Modular, expandable architecture
- Direct integration with existing or new Enphase systems
- App-based monitoring and usage control
Benefits of Adding Battery Storage
- Backup power during outages
- Prioritize self-consumption (use your energy first)
- Increase energy independence
- Enable solar operation during grid failures
- Reduce exposure to rising utility rates
- Potential for time-of-use optimization (where applicable)
- Modular capacity for expanding needs
- Silent, clean, and maintenance-free compared to generators
Main Considerations
Capacity & Duration
“How long will my batteries last?” — depends on load and consumption. Larger batteries support longer runtimes, but actual performance varies based on what’s powered (heating, cooling, well pumps, appliances, etc.). Usage can be monitored and controlled through the Enphase app.
Location Requirements
Batteries must be installed in a garage, basement, or detached structure. Fire code requires two-hour fire protection which may require constructing an enclosure unless installed in a finished garage or detached structure. Batteries should be located near the service panel and other solar components for efficiency. Outdoor installation is supported but performance is reduced in freezing climates.
Utility Coordination
Utilities calculate total system output by combining solar + battery capacity, which may trigger service upgrades. Some utilities also offer demand-response incentives that allow them to briefly access battery capacity during peak summer loads, helping offset project costs.
Ideal Battery Storage Customers
- Homes seeking protection from outages
- Homes in rural areas with unstable grid service
- Customers seeking energy independence from utilities
- Solar homeowners who want to maximize self-consumption
- Homes without access to natural gas or propane for generators
- Customers who prefer silent/maintenance-free backup power
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