PRE RELEASE. Unlike many opinionated reviews, the Solar Review Battery Assessment Criteria compares the Tesla Powerwall 2 against the industries best known specifications.  The result, a solar battery review with no room for discretionary bias and the transparency you desire.  


Make and model:  Tesla Powerwall 2.

Variants:  13.5 kWh.

  Guarantee, Performance.


GREATER THAN 3.3 IS A VERY GOOD SCORE. The following content for the Tesla Powerwall 2 should be used as a guide only. Individual circumstances and compatibilities should always be taken into account when selecting the right solar battery for any given installation. This content has been built using the Solar Review Battery Assessment Criteria 1.0 based on available product specifications at the time of writing. 


Design is what defines a particular solar batteries versatility, base chemical makeup, and verification of defined parameters to assist greater value through innovation and advancement. 

Tesla Powerwall 2 data sheet >


Powerwall 2 - Design
  • LNMC (Lithium Nickle Manganese Cobalt)
  • AC Coupled.
  • On Grid/ On Grid & Backup/ Backup.
  • 6+ compatible inverters.
  • 6+ scalability.
  • No awards listed.
  • CE certification.
  • IP 67.


It’s great to have the ability to store excess generated solar energy. However, just how much of your energy is lost during the energy storage to usage process? Get to know a solar batteries round-trip efficiency.  


Powerwall 2 - Efficiency
  • 90% round-trip efficiency.


Performance in more ways than efficiency alone. How does a solar battery perform within its intended environment and in adverse conditions? The key specifications not often at first thought.


Powerwall 2 - Performance
  • Min temperature range of -20°C (-4°F).
  • Max temperature range of +50°C (+122°F).
  • Weight per kWh: 8 kg (17.6 lb).
  • Depth of Discharge 100%.
  • Operating humidity 100%
  • Max altitude 3000m


As guarantee obligations can often be shielded by installer incompetence, should a solar panel manufacturer define an adequately trained installer network with a complimentary warranty extension (added end-user benefit), such guarantee has been considered as a base warranty more likely of adhering manufacturer installation specifications.

Important: A manufacturers obligations under guarantee will be obsolete if the solar battery is not installed to manufacturer specifications. Use an authorised installer.


Powerwall 2 - Guarantee
  • 10-year warranty.
  • Parts & service warranty.
  • Unlimited cycles.
  • Authorised installer network with additional end-user benefits.


All well and good having the greatest technology, but what if that technology is simply out of reach for most? Adversely, the cheapest product may lack essential capabilities expected by many end-users. Put price into perspective. Affordability is where price and technology come together to help determine value. 


Powerwall 2 - Affordability
  • Superior technology score (4.2).
  • Approximately $800 per kWh USD ex.


The below overall assessment for the Tesla Powerwall 2 solar battery is broken up into two final scores.

  • Overall technology ranking; the average of design, efficiency, performance and guarantee (for those less concerned about price).
  • Overall ranking; the average of design, efficiency, performance, guarantee and affordability. 


Powerwall 2 - Overall
  • Design 3.8
  • Efficiency 3.0
  • Performance 4.9
  • Guarantee 4.6
  • Technology 4.1
  • Affordability 3.8

Have a question?

Don’t be shy, leave it below and a Solar Review community member will respond with the insight you need. 


How was the score for the Tesla Powerwall 2 calculated? By utilising the Solar Review Battery Assessment Criteria V1.0 >


  1. Missing power shifting capability which for 60% of the world Res CA Mkt NEM 2.0 SCE PGE solar penalty .41 cents per kWh 4-9pm M-F leaves you with a 8-10 year ROI. Which is still to risky for first adopters on new products. Two SMA 6.0 Sunny Islands with 2, LG Batteries offer a 5 year ROI with recent price reductions. Install kits available at Proven reliability and performance with programming options to game the utilities big business plans perfect for a 2500-5500 sq ft home mkt.


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