HRV no longer offers residential solar installations. If you are interested in adding solar to your home we suggest using an approved SEANZ professional.

If you purchased a residential solar system from HRV Solar and would like to speak with someone about service you can get in touch on 0800 HRV 123 or at

Tesla Powerwall 2 Review

EN \  Blog \  Tesla Powerwall 2 Review

Tesla Powerwall 2 Review

20 November, 2018

When you think of Solar Batteries there are many options out there in the market but one make and model, the Tesla Powerwall 2 really stands out when it comes to capturing public attention.

The Telsa Powerwall 2 is compatible with the HRV Solar product range and our technicians are able to install them at the same time they install the solar panels on your roof.

So we’ve put together this handy guide on the Tesla Powerwall 2, for savvy locals looking to add extra storage to their solar power systems.


Why did we choose the Powerwall 2 at HRV Solar?

Musk and Tesla are synonymous with the future of clean energy, technological advances and design prowess. Tesla’s products are driven by Musk’s vision for a world run on clean energy, and offer a way for solar powered homes to harness solar energy outside of sunshine hours.

At 155mm deep and weighing just 125kg, the Tesla Powerwall 2 lithium-ion battery is thinner and more rectangular than the previous Tesla Powerwall, making it versatile for floor or wall mounting and it can be stored inside or outside your home.

Beyond the recognition of Tesla’s innovative, cool looking products, at HRV we chose the Powerwall 2 for its reliability and performance.

Firstly, Lithium-ion batteries are regarded as the most energetic rechargeable batteries available.

The Powerwall 2 is actually slightly heavier than its predecessor, but, according to Business Insider, has twice the energy and twice the storage as the first-generation Powerwall, at rates superior to most other models on the market (we go into more detail on this below).

The Powerwall 2 also runs very quietly and uses an efficient and cost-effective internal inverter system. This inverter system converts DC energy to AC energy (the type of energy used by most household appliances and electrics). In the first Powerwall model, the inverter had to be purchased separately at extra cost, so the update means this important function is included in the purchase price for consumers.

The Powerwall 2 is also lauded for being completely automated, meaning like the Tesla cars, systems don’t typically require technical operation by users, and are updated by firmware updates. These firmware updates add new features and enhance existing functionality - just like when you install the latest iOS system on your iPhone.

The Powerwall 2 technology also monitors and controls its energy requirements in real time. And you can even monitor the Powerwall 2 system remotely on the Tesla app - which has heaps of cool functions, including warning you about a cloudy day.


Why should you have a battery alongside your solar energy system?

Powerwall teams up with your solar system to store excess energy generated during sunlight hours, so power can be available when you need it - minimising reliance on grid power.

According to Tesla, the batteries can also be used by non-solar homes to store energy collected during off-peak times when grid power prices are generally lower, and used during on-peak times when those grid power prices tend to go up. This off-grid feature is not currently available in the New Zealand market, but full off-grid capabilities are coming in the future.

This can also be a good option for grid-connected homes to keep them connected during an outage.



History of the Tesla Powerwall

Enter, Tesla; renowned for the sleek and luxurious aesthetic of its high performing electric vehicles.

Tesla Energy has developed expertise around the usage and safe deployment of lithium ion batteries in electric vehicles and that knowledge is exemplified in the Tesla Powerwall.

Sure, the tech giant Tesla Energy is based in Silicon Valley, and you might not be on the waiting list for a Tesla Roadster just yet - but Tesla Powerwall 2 solar batteries are an excellent option to accompany solar panel installations in New Zealand.


How does the Tesla Powerwall compare to other solar batteries?

According to Tesla, an average home uses approximately 20 kWh of energy per day, with the range between 10kWh for a small home and 40kWh for a large home. The company says each Powerwall provides 13.5 kWh of usable energy for backup power - meaning enough power is saved to get you through an outage.

This is something which you can easily track and monitor using the Tesla mobile app.

However, when paired with solar energy production, the Tesla Powerwall 2 can continue to recharge and Tesla says this has the potential to run your home indefinitely.

For context, when you compare other brands of batteries on the market, the LG CHEM RESU has 5.12kWh of storage, the Sonnen has 2kWh, and Panasonic 8kWh. Consult our 2018 Guide to Solar Battery Storage Systems for more comparisons.


Why do New Zealanders like the Tesla Powerwall?

Choosing the Tesla Powerwall 2 can offer Kiwis peace of mind, as in addition to your rights as a consumer under the Consumer Guarantees Act, each system comes with a ten year warranty from Tesla Energy. The limited warranty covers defects in parts and workmanship, provided the Tesla Powerwall is registered and used as intended.  It also should not require any maintenance. A standard Solar system with a Tesla Powerwall 2 installation will be a 1-2 day process.


Check this space later for some Tesla Powerwall 2 reviews!


What is the price of a Tesla Powerwall 2 in New Zealand?

The price differs depending on your home’s needs, but on on the Tesla website, you can calculate your home’s requirements for the battery according to your home’s size and power needs.

Use our Solar Solution E-valuator to work out how much solar energy your home could harness, and what that could be worth. Our solar solution recommendation is based on your household, such as roof size, the size of your section and the time of day you’re usually home. You can also get a quote that includes a battery storage upgrade.

You can also request a Free HRV Home Assessment and one of our solar experts will help you determine your exact needs.


The Tesla Powerwall 2 By Numbers

Usable Capacity: 13.5 kWh

Depth of Discharge: 100%

Efficiency: 90% round-trip

Power: 7kW peak / 5kW continuous

Warranty: 10 years

Scalable: Up to 10 Powerwalls

Operating Temperature: -20°C to 50°C

Dimensions: L x W x D: 1150 mm x 755 mm x 155 mm

Weight: 125 kg

Installation: Floor or wall mounted and indoor or outdoor

Certification: International Standards and Grid code compliant

Latest articles

2018 Guide To Solar Battery Storage Systems
01 November, 2017
2018 Guide To Solar Battery Storage Systems
Solar battery storage takes the pressure off the need to use the majority of your energy during the middle of the day when the sun is at its brightest. This is because any energy that is not used as it is generated, is sent to the battery storage unit to be used at a later time.
How Much Do Solar Panels Cost In NZ?
08 November, 2018
How Much Do Solar Panels Cost In NZ?
You probably already know how great solar power is, which is why you’re digging deeper and asking important questions like, “How much does solar panel installation cost?” We imagine you’re asking this question because you may have heard that the sun’s energy is free; but in reality you’re going to need to invest in the right solar energy system to harness this power. Well, you’ve come to the right place with these questions - because we have put together this article to run you through the costs of installing solar power in New Zealand.
How Solar Panels Work In New Zealand
12 September, 2017
How Solar Panels Work In New Zealand
We’ve all heard about how solar panels may reduce our power bill and enable us to live a more self-sufficient lifestyle, but not many of us know how solar panels actually work.