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The sonnen eco has a starting list price of $10,000 before installation.
The sonnenCore battery starts at a price of $9,500 before installation.
The sonnenCore boasts a maximum power rating of 8.6 kW to go along with 10 kWh of usable capacity.
The sonnen ecoLinx costs $36,000 or more before installation.
You may need a few eco, sonnenCore, or ecoLinx batteries to truly go "off the grid."
A qualified EnergySage-approved installer can give you the best information about the sonnen eco home battery system and other energy storage options available to homeowners today.
The sonnen eco, sonnenCore, and ecoLinx batteries are ideal pairings for solar panel systems, especially if your utility has reduced or removed net metering, time-of-use rates, or demand charges. Installing an energy storage solution like the sonnen eco, sonnenCore, or ecoLinx allows you to maintain a sustained power supply during the day or night as long as you store enough power from your solar panels when the sun is shining.
As with other energy storage products, these batteries are sized for day-to-day use at your home, and they''re often paired with a home solar panel system. When your solar panels produce more electricity than you can use in your home, the excess is stored in the battery system instead of being sent back into the grid. When your panels aren''t producing enough electricity to meet your home''s needs, you can use the electricity stored in your sonnen home battery instead of having to buy it from your utility company.
sonnen describes the eco battery as an "all-in-one residential solar battery solution." It offers various grid-tied functions, including increasing household solar self-consumption and managing time-of-use electricity rates for maximum savings on your electricity bill. The battery also has some backup power capabilities.
Among the most important considerations when you''re comparing solar batteries are the size of the battery (power and capacity), its chemistry, depth of discharge, and roundtrip efficiency.
The sonnen eco comes in seven different sizes with varying power and usable capacities. Power (measured in kilowatts, or kW) determines the maximum amount of electricity a battery can output at a single time, while usable capacity (measured in kilowatt-hours, or kWh) is a measure of the maximum amount of electricity from your battery on a full charge.
Think of your battery like water running through a pipe. Energy capacity is the amount of water available to push through the pipe, while power is the size of the pipe itself. Larger pipes allow more water to flow through at once, which depletes the water faster. Similarly, a battery with a high power rating can deliver more electricity at one time but will burn through its available energy capacity faster too.
A battery''s power determines what appliances you can run with it at once, while usable capacity determines how long those appliances can be run. Batteries with a higher power rating are capable of powering more robust appliances or many appliances at once, while batteries with a higher usable capacity can store total energy and thus can run your appliances for longer periods of time without needing to recharge.
The functionality of one solar battery next to another can vary; some batteries boast of superior off-grid capabilities, while others offer software solutions for rate arbitrage. Here are some of the most important qualities of the sonnen eco:
The sonnen eco is an AC-coupled battery; this means that in a solar plus storage system, direct current (DC) electricity flows from solar panels to a solar inverter that transforms the electricity into alternating current (AC) electricity. That AC electricity can then flow to your home appliances or go to another inverter that transforms the electricity back to DC for storing in a battery system.
The sonnen eco comes with backup power capabilities. Most solar batteries require an external transfer switch to allow for off-grid operation, but the sonnen eco has a built-in automatic transfer switch. This means that with the correct power electronics set up, your sonnen ecosystem can automatically power your home appliances when the grid goes down.
The sonnen eco is a lithium-ion storage product, specifically, it''s a lithium iron phosphate (LFP) battery. Relative to other types of batteries, LFP batteries are known for their high power rating and safety – to learn more about how different lithium-ion battery chemistries stack up against one another, check out our overview of battery chemistry differences.
Two key ways to evaluate the performance of a solar battery are its depth of discharge and roundtrip efficiency.
Depth of discharge (DoD) indicates the percentage of a battery''s energy that has been discharged relative to the overall capacity of the battery. Because the useful life of a battery decreases each time you charge, discharge, and re-charge it, many battery manufacturers specify a maximum DoD level for optimal battery performance. In general, batteries with a higher depth of discharge are considered higher-quality products. The sonnen eco line boasts a depth of discharge of 100 percent across all battery sizes.
Roundtrip efficiency is a measure of the electrical losses involved with charging and discharging a particular battery. The higher the percentage, the more efficiently the battery is able to convert incoming electricity into stored electricity and then back into usable electricity. All batteries in the sonnen eco line have a roundtrip efficiency of 81.6 percent; this means that for every 10 kilowatt-hours (kWh) of electricity you put into the battery, you''ll receive 8.16 kWh of output.
According to sonnen, "the sonnenCore is an intelligent energy storage solution that combines smart energy management software with safe, long-lasting and cobalt-free batteries to efficiently manage energy usage throughout the day, store excess solar power for use at night and provide reliable emergency backup power to keep homes protected during grid outages."
The sonnenCore is more compact than any battery sonnen has launched before. It is an LFP battery (as opposed to the traditional Lithium-Ion NMC technology many batteries utilize), which can offer longer life, improved reliability, and increased safety compared to more traditional lithium-ion battery technologies. With their companion computer or phone apps and a solar-plus-storage system, you can view real-time energy usage and solar electricity generation from wherever at any time.
The sonnenCore comes in one size currently, available in both AC or DC configurations. The sonnenCore boasts a maximum power rating of 8.6 kW to go along with 10 kWh of usable capacity.
The sonnenCore is designed to provide both excellent off-grid capabilities and software solutions specific to rate arbitrage.
The sonnenCore has a roundtrip efficiency of 85%; this means that for every 10 kilowatt-hours (kWh) of electricity, you put into the battery, you''ll receive 8.5 kWh of output. The sonnenCore boasts an excellent depth of discharge of 100%.
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