PRE RELEASE. Unlike many opinionated reviews, the Solar Review Battery Assessment Criteria compares the AlphaESS SMILE5-BAT 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:  AlphaESS SMILE5-BAT

Variants:  5.7 kWh.

  Design, Guarantee.


GREATER THAN 3.3 IS A VERY GOOD SCORE. The following content for the AlphaESS SMILE5-BAT 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. 

AlphaESS SMILE5-BAT data sheet >


SMILE5-BAT - Design
  • LFP (LiFePO4)
  • AC Coupled.
  • On Grid/ On Grid & Backup/ Backup.
  • Inbuilt Inverter.
  • Up to 6 scalability.
  • iF Design Award 2018.
  • CE Certificated.
  • IP 65.


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.  

Alpha-ESS Battery Storage Image


SMILE5-BAT - Efficiency
  • 92% 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.


SMILE5-BAT - Performance
  • Min temperature range of -10°C (50°F).
  • Max temperature range of +50°C (+122°F).
  • Weight per kWh: 11 kg (24 lb).
  • Depth of Discharge 96%.
  • Operating humidity 85%
  • Max altitude not listed.


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.

Alpha-ESS Battery Storage Image


SMILE5-BAT - Guarantee
  • 10-year warranty.
  • Parts & service warranty.
  • 10,000 cycles.
  • No authorised installer network.


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. 


SMILE5-BAT - Affordability
  • Very good technology score (3.7).
  • Price to be confirmed.


The below overall assessment for the AlphaESS SMART5-BAT 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. 


SMART5-BAT - Overall
  • Design 3.7
  • Efficiency 3.5
  • Performance 3.3
  • Guarantee 4.3
  • Technology 3.7
  • Affordability 3.1

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 AlphaESS SMART5-BAT calculated? By utilising the Solar Review Battery Assessment Criteria V1.0 >


  1. My question is s follow, can I charge the Li-ion batteries from a
    1)generator in case we have no sun
    2)Charge the batteries from the AC output side from a Grid tie inverter

  2. Hi I’m looking at a ess 10kw battery for $3000 installed with gov subs is this a good deal and will my 6.6kw jinko panels and 5kw fronious inverter be able to charge it properly to make a difference to my bills and pay the system off my daily kW usage is 13.5kw I only just got solar so haven’t had a bill yet so not sure if I should go for this battery deal or not thanks

  3. Hi, I have an Alpha ESS LivePo4 SMILE 5 battery, 48 volts 5.7Kw. I use an MPPSolar Inverter and I try to find out what the best way is to work with this marvellous battery. My inverter can work Battery-free, it is a 5Kw inverter and handels 125/45v volt PV input. I can adjust max charge amperes in steps of 10 amps. I can set a ”Bulk charging voltage (C.V. Voltage) in steps of .1 volt. I can set a Float charging voltage in steps of .1 volt. I can set a Back to grid voltage in steps of .1 volt. I can set a Back to discharge voltage in steps of .1 volt. I do not have an option of using the data from the battery, there is no stand-alone meter. My inverter is built for Lead Acid/gel batteries. Alpha ESS will not give me much information/help me, because I did not use one of their own inverters. I hope you can tell me more. Thanks


Please enter your comment!
Please enter your name here