ilumen

Battery Backup

What is Solar + Battery Storage and How Does it Work?

Solar and battery storage offers a unique way to maximize your system’s financials, avoid power outages, and provide peace of mind. With solar and batteries paired, you can charge the batteries with excess solar generation during the day, and power your home from that stored energy during the night.

Benefits of Battery Integration

Our modern society relies heavily on the electrical grid for necessary day to day activities. Unfortunately, power outages and temporary grid failures are inevitable and unpredictable. Batteries integrated with a solar energy system provide instantaneous backup, either for a short period of time or regeneratively for longer periods of time depending on the system size and configuration.

ComEd recently adjusted their solar net metering policy to "Net Metering 2.0" which is a supply only credit for over production sent back to the grid. By storing the energy onsite instead of sending back to the grid, your system yields the full rate savings when drawing that power later in the evening and night. The savings accrued over the useful life of a battery system often pays for itself, especially when considering future electricity rate increases.

Lithium Iron Phosphate (LiFePO4 or LFP) batteries belong to the family of lithium-ion batteries but with a unique composition that sets them apart. LFP chemistry is absent of cobalt minerals which have a history of thermal runaway and unethical mining practices. We consider Lithium Iron Phosphate as the "next level" of the battery industry evolution for many reasons, and it's now established as an industry standard.

On-the-fly load management and visibility on the mobile app provides flexibility and control whether you are home or away. The robust advancements and integrations with energy management systems are currently evolving at an impressive rate.

Outages for extended periods of time are becoming more frequent due to increased weather threats and electric grid infrastructure issues. Additionally, a hot button topic these days is the reliability against cyber-attacks to local and regional grid management systems. With available generator integrations, battery management systems can be designed to withstand long term outages, providing security no matter the instance.

2025 Battery Incentives

The 30% Investment Tax Credit (ITC) has been a foundational industry accelerant for solar, and the same is happening now that batteries also qualify for residential energy credit. Battery storage, either with or without solar, qualify for the 30% ITC and provide a dollar-for-dollar reduction in tax liability for the year placed in service. Please consult with a tax professional regarding any qualifying tax credits.
ComEd recently included the Distributed Generation Battery Rebate for homeowners. The ComEd battery rebate is yields $300 per kWh of storage capacity with funds typically disbursed about 4 months after installation.

Solar + Storage Configurations

If you are experiencing frequent grid outages and have critical operations or perishables that always require power.

By storing excess solar production during the day and utilizing it at night, you're maximizing financials by avoiding partial credits for what would normally be sent back to the grid.

By adding an additional battery to the system, you're able to leverage self-metering while having extra storage to provide confort at any time of the day. With all other aspects of the project already accounted for, the cost of adding an additional battery is rather favorable.

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    Battery

    Ilumen Solar offers a wide variety of battery options to fit your back up needs.

    Franlin Battery

    Franklin aPower 2

    Chemistry

    Lithium Iron Phosphate (LFP)

    Nomimal Rating

    15kWh

    Maximum Continuous Discharge

    10kW AC

    Warranty

    15 Year/60 MWh

    Heavy Load Start

    185 LRA

    Staff Pick!

    mounted charger

    Enphase IQ Battery 10C

    Chemistry

    Lithium Iron Phosphate (LFP)

    Nomimal Rating

    10kWh

    Maximum Continuous Discharge

    7.08kW AC

    Warranty

    15 Year

    Heavy Load Start

    90 LRA

    Tesla Powerwall 3

    Tesla Powerwall 3

    Chemistry

    Lithium Iron Phosphate (LFP)

    Nomimal Rating

    13.5kWh

    Maximum Continuous Discharge

    11.5kW AC

    Warranty

    10 Year

    Heavy Load Start

    185 LRA

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