Fox ESS EQ3300-L5 16 kWh | Rosemead, CA

The Chen family lives in Rosemead, CA, in a five‑person household with daily electricity usage of around 18–20 kWh.

In 2023, they installed a 9.6 kW solar system. Their solar panels generated power during the day, but most of their energy use happened after sunset.

With California’s updated NEM 3.0 policy, selling extra solar energy back to the grid became less attractive, while buying electricity at night became more expensive.

The family also wanted backup power protection and a system that could support future EV charging.

Their goal:

Store more solar energy, reduce grid dependence, and prepare for future energy needs.

The Solution

We installed a Fox ESS EQ3300‑L5 battery system with 16.0 kWh total capacity, connected to their existing 9.6 kW solar system.

Its modular design also allows future expansion as the family's electricity needs grow.

Why 16 kWh?

The battery size was selected based on the family's actual energy usage.

Their highest electricity demand happens between 4 PM and 10 PM — during dinner, air conditioning, lighting, and daily activities.

With around 14.4 kWh of usble energy, it stores extra solar power during the day and lets the family use it at night. This helps reduce their reliance on expensive grid electricity.

A smaller battery could reduce upfront cost, but may not provide enough capacity during hot California summers or future EV charging.

Built for California Conditions

Designed for Southern California homes, the EQ3300‑L5 provides:

Outdoor installation capability with IP65 protection

Wide temperature operation for hot summers and cooler winters

Quiet operation with natural cooling

Long‑lasting LiFePO₄ battery performance

Ready for the Future

When the Chen family adds an electric vehicle, the expandable battery system can grow with their needs.

By combining solar + storage, their home can:

Use more of its own solar energy

Improve backup power protection

Reduce reliance on the grid

Prepare for future EV charging

More solar stays at home. Designed for today. Ready for tomorrow.