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Energy Storage

SolarEdge Sunbank Battery charging level

Why Energy Storage ?

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In April 2023 the California Public Utilities Commission (CPUC) approved the utilities' demand for a change in the Net Metering program (= NEM 3.0).

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NEM 3.0 has significantly reduced the value homeowners receive for excess energy sent back to the grid from their solar systems. The compensation for this surplus energy has decreased, making it less financially beneficial.

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Energy storage offers a smart solution. Instead of selling excess energy back to the grid for minimal returns, homeowners can store it in a battery system for later use. This brings several advantages:

a) You get the full value of each kWh stored, avoiding utility charges;

b) You can use stored energy during expensive peak times;

c) Nighttime use of stored energy eases grid demand;

d) You’ll rely less on the grid and have backup power during outages (optional).

 

The energy storage system is eligible for a 30% Federal Tax Credit.

​​There are two different methods when it comes to connecting a solar system and an energy storage system.  The installer should discuss these options with the homeowner and make recommendations based on their priorities.  â€‹

There are pros and cons for both system types.  â€‹Generally, cost is a large factor combined with the

need or desire for resiliency.  Someone living in the country with frequent power outages is going to choose different than someone living in the City whose interest lies primarily in energy management.​​

(1) - AC-COUPLED SYSTEMS

In an AC coupled system, power from the PV modules is converted to AC prior to connecting to the ESS (Energy Storage System). This means that the power must be re-converted to DC before charging the battery and any power output from the ESS must be converted once again to AC. The AC-coupled system usually comes with an inverter integrated into the storage components.​

(2) - DC COUPLED SYSTEMS

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DC-coupled battery system requires the use of only one inverter. This is a more specialized piece of equipment than the inverters used for AC-coupling, as it is a hybrid inverter used for both the battery and the solar panels

DC output power from the PV modules can directly charge the ESS. No DC-to-AC conversion is required between the PV array and ESS. 

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FranklinWH aPower battery wall-mounted
SolarEdge Sunbank Battery wall-mounted
AC /DC - PROS & CONS

For more information, please click here

Credit: Lucas Miller / Mayfield Renewables, Corvalis, OR

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