Tesla Powerwall vs. Simpliphi AccESS Schneider

Simpliphi vs. Powerwall 2

Powerwall is the solar battery that comes to mind first when thinking about adding battery storage to their solar array. However, this isn’t the only home battery on the market. One of these batteries is the Simpliphi AccESS Schneider.

Equipment Integration Offered by Each Battery

One of the things that make the Simpliphi AccESS Schneider a competitor to the Powerwall it’s integration capabilities.

Simpliphi AccESS Schneider Battery-inverter Combo

The Simpliphi Access 15.2 kWh home battery has an integrated Schneider Electric continuous 6.8 kW inverter. This combination allows the battery to connect to a solar array or home without additional equipment.

Powerwall Home Integration Setup

The Powerwall was the first home battery to add an inverter. The Powerwall 2, which rolled out in 2016, came in either a 13.5kWh AC-coupled or DC-coupled version with 5kW of continuous power and a 7kW peak output rating. The difference was that the AC-coupled version included an integrated inverter.

Difference Between Powerwall+ and Powerall 2

In 2021 Tesla launched Powerwall+, a 13.5kWh AC-coupled home battery with a separate 7.6kW solar inverter and integrated breaker, which streamlines the installation, increasing the continuous power to 5.8kW on-grid 7kW off-grid and increasing the peak output rating to 7.6kW on-grid 10kW off-grid. Together the solar inverter and the Powerwall+ provide a peak power capacity of 12.9kW, which means the Powerwall+ can more easily handle a high surge in power.

Comparing Equipment Specs

The Specs that Make Simpliphi a Worthy Competitor

The Simpliphi Access has a lot of features that make it worth considering. Some of these include:

Dimensions (W x H x D)29.5” W x 76”H (w/feet) x 20”
Connection TypeDC-coupled
ChemistryLithium iron phosphate battery (LFP)
Weight600 lb
MountingFree-standing or Pad-mounted
Usable Capacity15.2 kWh
Continuous Power6.8 kW
Peak Power7.6 kW DC
Depth of Dischargeup to 100%
Round Trip Efficiency98%
Cycle Life/Warranty10,000+ (@ 80% DOD) or 10 years

Specs that Put the Powerwall at the Top

Dimensions (W x H x D)45.3 in x 29.6 in x 5.75 in
Connection TypeAC or DC coupled
Weight251.3 lbs
MountingFloor or wall mount; stack up to 10
Usable Capacity 13.3kWh
Continuous Power5.0kW
Peak Power7.0kW
Depth of Discharge100%
Round Trip Efficiency90.0%
Cycle Life/Warranty10 years @ 70% (unlimited cycles or 37,800 kilowatt-hours~3,200 cycles)

Levelized Cost of Storage: Price Comparison

The Levelized Cost of Storage is similar to the Levelized Cost of Energy. Each looks at all of the contributing factors. For storage, this means the price, expected charge/discharge cycles, depth of discharge, battery capacity and round-trip storage efficiency. Below is the equation for finding the Levelized Cost of Stored Energy.

Simpliphi AccESS Schneider LCOS

The Simpliphi Access comes to about $21,375. It has a 15.2kWh capacity, a 10-year or 10,000 cycle warranty at 80 percent depth of discharge and 98 percent round-trip efficiency. Together these factors equal an LCOS of $0.179/kWh.

Tesla Powerwall LCOS

The Tesla Powerall 2 is about $10,000 for the battery and installation. It has13.5kWh of usable capacity and a 10-year warranty with an unlimited cycle clause. However, if you assume that the Powerwall has 75 percent efficiency, the end of the 10-year warranty comes out to about 3,200 cycles. Additionally, the Powerwall has 100 percent depth of discharge and 90 percent round trip efficiency. When you take the cost of the Powerwalll and divide it by capacity, cycles, efficiency and depth of discharge, you get an LCOS of $0.257/kWh.


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