Delta review

Delta - Inverter Reviews

4.3

Based on 191 ratings

Finn's Delta Inverters Review & Verdict

Finn Peacock has been a Chartered Electrical Engineer since 1998, and is ex-CSIRO

Back in the day when I worked as a control engineer in a nuclear power station, we used Delta power supplies in the boiler control systems. They certainly know how to make reliable electronics. And that makes it doubly disappointing that their warranty is only 5 years. Most good brands offer 10 year inverter warranties these days.

But if you can look past the stingy warranty, Delta are a good choice.

Delta Inverters: Pros & Cons

  • Well established company with a very good track record for quality and service
  • Solid construction - high temperature tolerant electronics, die-cast enclosures
  • Some models have 4 MPPTs
  • Warranty is only 5 years - but can be extended to 10 year for an extra cost

About Delta

Delta Energy Systems is a subsidiary of multi-billion dollar global company Delta Electronics Group, which makes all sorts of industrial, medical and consumer electronics as well as solar inverters.

Australian Contact Details

Sydney Office
Unit 18/39 Herbert Street, St Leonards NSW 2065
02 9479 4200 / 1300 335 823

Melbourne Office
Unit 2, Building A, 18-24 Ricketts Road, Mount Waverley, Victoria 3149
03 9543 3720 / 1300 335 823

Website | Support website

Company Info

Headquartered in Taiwan, the company commenced operations in 1971 and has been producing solar inverters since 1999.  Delta says it regularly invests more than 8% of  annual sales revenues in research and development, has R&D facilities in China, Europe, Japan, Singapore, Thailand, and the U.S. 

Delta Inverter Models

For the Australian residential market, Delta currently has a solar inverter product line that we include on our comparison tables - the Home Series.

Home Series H5A

A single-phase 5kW inverter, the H5A_222 has very low startup and shutdown voltages - 35vDC and 30vDC respectively - meaning early wakeup and late shutdown. It's quiet (< 20 dB), offers 98% peak efficiency, has a built-in smart meter, 24-hour consumption monitoring, 2 MPPTs and Delta provides free monitoring provided by MyDeltaSolar cloud. Compact and light, this inverter's dimensions are 380 x 318 x 130 mm, and it weighs 11.8 kilograms.

Home Series H8E and H10E

The Delta 8HE (7.36kW) and H10E (9.2kW) each have a built-in consumption meter, are dynamic export control capable, offer point-to-point and cloud Wi-Fi monitoring and a maximum efficiency of 98%

A feature of these inverters that really jumps out is they each have 4 Maximum Power Point Trackers (MPPTs) rather than the usual two. This is very useful if you have multiple roof faces pointing in different directions, or panels on one string different to the other/s. On the aesthetics side, it's a good looking unit with rear cable entry, removing any cables from view. The dimensions of these inverters is 425 x 590 x 160 mm, and they weigh 21.6 kg.

Compare model specifications and pricing against other products using the SolarQuotes inverter comparison table.

Delta Inverter Warranty Notes

A 5 year warranty is offered on Delta Home Series solar inverters. This can be extended to a 10 year full swap-out parts and labour warranty.

With multiple offices in Australia, local warranty support should not be a problem. However, the first point of contact for warranty issues should be the business that installed your Delta solar inverter, as they bear the responsibility for warranty work. 

In the scenario the installer/company is no longer around or otherwise uncontactable, Delta advise that Australians should contact their warranty department on the number listed above. Delta will then email the customer a warranty claim form, which needs to be filled in and returned. Delta will then arrange for the repair/replacement of the inverter.

Conclusion

While the 5 year warranty is less than some manufacturers offer, Delta manufactures solid gear - and that's reassuring. If you're looking for a inverter that offers an excellent balance of quality and price, Delta is well worth considering.

Delta is a SolarQuotes approved brand

Images from customers

Reviewers report paying:
$4,000 - $4,700

For a

solar system with a
Delta inverter

Depending on hardware choice and installation difficulty

Delta has 2 solar inverters in our database

Filter by:

Price 
Inverter Size 
Phase type 
Model number
Approx Price
Inverter Size
Max Efficiency (%)
# of MPPT's
Phase Type
H5A_222
$550
5000 W
97.5%
2
Single phase
+ More details
M15A
$3000
15000 W
98.40%
2
Three phase
+ More details

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Delta Reviews (191)

Show Most Relevant reviews from All time

  • 5 star 104
  • 4 star 68
  • 3 star 5
  • 2 star 7
  • 1 star 7

View Timeline

In twelve months it dropped off the internet twice and was easily reconnected , so no real issues

Panel Brand

Winaico

System Cost

$6,000 to $10,000

System Size

5kW

Installed By

United Solar Energy

Panel Brand

I forget what brand they were (Other)

System Cost

$6,000 to $10,000

System Size

5kW

Installed By

Advanced Solar Technology (North)

System Cost

$2,000 to $4,000

System Size

5kW

Installed By

Boost Solar

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

JWS Electrical Services
They need a better app. Their app is unstable and not very polished

Manufacturer Reply

Thanks Ian for the 4 stars , the app issue is noted and is with the Delta Business Unit for review. Mark

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
My Delta inverter worked well for the first year, but has since had continuing problems.

I have spent long hours on the phone with Delta with no success.The IT support have tried to re-commission and problem solve with no success.

The inverter shows no WiFi connection when I know my internet is working and lately the grid light is either off or blinking. The app shows no input for large chunks of time and all data for the first two years has been lost.

System Cost

$6,000 to $8,000

System Size

6.6kW

Installed By

Narooma Electrical
The PowerPal app that lets us monitor consumption has been invaluable as is the Delta production app to monitor production. We have experienced no problems at all in th eyear we have had the system.

Panel Brand

JA Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
The inverter activates early in the morning. Sunrise 5:12am and can see rise in kW immediately. 0.5kW by 6:35am. 1kW by 7am. 3kW by 8:20am. 4.7kW by 9:50am.
Peak output appears to be 4.8kW instead of 5kW - not a lot but (4%) will add up over time.
Once at 4.7-4.8kW the system rarely flat lines at the peak output, but bounces around the 4.5 -4.8kW. There always seems to be an early drop off post 12noon, which is unexplained at present (don't think shading/clouds have been the cause).

Manufacturer Reply

Hi Andrew, Sad to see that our product isnt delivering a 5 star performance for you. However you may find that the Var and Volt/Watt settings required by Western Power are causing this to occur and out of our control. If you like we are happy to investigate the drop-offs and see if we can deliver an answer. We are always aiming for five stars at Solar Quotes and hope we can offer the investigative service to pick up an extra star from you. Email your details [email protected] and mention you are doing so as per the discussion with Shane Arnold, AU/NZ Solar manager.

Panel Brand

JA Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
We ended up having some real issues here. First off the installer didn't realise that we were on two phase so needed a second inverter. Before they installed the second one, the first one fried itself because it was trying to export to the grid when we have zero export. Delta sent out a replacement inverter which seemed ok. We then receieved the second inverter which was installed, same issue as the first (they couldn't stop it from exporting). We then had to get yet another replacement. Finally 5 months after the inital installation, we were able to get our solar up and working. Turned out to be a firmware issue. You would have thought Delta would have figured that one out earlier in the game. I felt bad for the installers

Manufacturer Reply

Hi Keith,

Thanks for the great review! The Team at Advanced Energy Management are top quality. if you have any questions regarding the features please don't hesitate to call our team on 1300 335 823.

Shane

Panel Brand

Canadian Solar Inc

System Cost

$6,000 to $8,000

System Size

6.6kW

Installed By

Advanced Energy Management VIC
No problems with the inverter itself - been 'purring like a kitten'. The app is generally slow and a bit dated looking.

Manufacturer Reply

Hi Kym, Thanks for the review.

There are two versions of the app available and you may want to search DELTA SOLAR as opposed to MyDeltaSolar.

Alex from Advanced Solar Technology is considered the longest consistent retailer of Delta inverters globally and a good friend of Delta Australia. Congrats on your system.

Panel Brand

Seraphim

System Cost

$4,000 to $6,000

System Size

5kW

Installed By

Advanced Solar Technology (North)
Delta inverter seems to work fine and converts whatever sunshine to usable power efficiently.

However the software and app leaves a lot to be desired!
It took three additional trips by the installer, including:
- setup of the inverter to properly communicate over Wifi
- fixing the correct type of plug for consumption monitoring
- setup of the inverter to report consumption monitoring
- plus two phonecalls from myself to Delta's rep in Australia to set the inverter up the right way to read consumption data correctly.

Manufacturer Reply

Hi Yih,

Unfortunate to hear of the long process you experienced. There is a new app "Delta Solar" which was recently released that uses the same log in details as original app. This presents data much nicer and allows P2P connection in a streamline manner. Shane, Delta Electronics Australia

Panel Brand

Seraphim

System Cost

$4,000 to $6,000

System Size

6kW

Installed By

Primero Electric and Solar

Panel Brand

Jinko Solar

System Cost

$2,000 to $4,000

System Size

4kW

Installed By

Zeco Australian Energy Solutions Bayside
The inverter has worked 100% since installation.

Panel Brand

Seraphim

System Cost

$2,000 to $4,000

System Size

6kW

Installed By

Advanced Solar Technology (North)
5kW Delta Inverter. The Delta software shows the inverter producing a maximum of 5kW. However we have two separate Engage monitors independently monitoring our solar output and electrical consumption. These show the inverter producing a maximum of 4kW. For example; today the Delta shows we were producing 5kW between 11:55 and 14:50 whereas the Engage monitor shows 4.41kW at 11:55 and 1.74kW at 14:50. The Engage graph is sawtooth whilst the Delta is almost flat line.

Manufacturer Reply

Hi Tom, The Delta inverter will deliver the information from its internal data. This is very accurate and will deliver it every 5 minutes to the cloud. Your third party monitor may have a higher refresh rate which you can also achieve with the Delta inverter by going point to point with your phone and receive 3 second interval data live

Panel Brand

Seraphim

System Cost

$3,000 to $6,000

System Size

6kW

Installed By

Advanced Solar Technology (North)

Panel Brand

Phono

System Cost

$3,000 to $6,000

System Size

5kW

Installed By

Advanced Solar Technology (North)
We are now on our second inverter. The first one had to have adjustments very early on & was then found to be faulty later on & only producing 800Wh from 17 panels. I contacted the installer & he contacted Delta with an open ended promise of rectification with no time frame. I contacted Delta myself & made my concerns known to them. I received a call from Delta later in the day & their people were at my home the next afternoon with a new inverter which appears to be functioning correctly. I have created a spread sheet & am now tracking output on a daily basis at 8pm each evening when the charge rate drops as the sun goes down.

Manufacturer Reply

Hi Ian,

Hope the system became operational and your logging showed a satisfactory resolution.

Shane, Delta Electronics Australia

Panel Brand

Suntech

System Cost

$6,000 to $10,000

System Size

5kW

Installed By

Geelong Solar Energy
The Delta invertor with the Phono panels seems to be a great combination.
No issues at all and the system is performing better than predicted expectations.

Panel Brand

Phono

System Cost

$3,000 to $6,000

System Size

5kW

Installed By

Advanced Solar Technology (North)
Quite easy to use in terms of data recall but I was a bit disappointed that it wasn't set up by the installers and I had to set the date, REBS buyback rate and other relevant data. I did mention this to the installer who said he would ensure this was done in future but when I checked this out on a friend's system that they installed (on my recommendation) the data on his inverter, also a Delta, was still on the factory settings. Its a very basic inverter but it is hardy and does the job very well. I concede that not many people actually check the data available on the inverter.

Panel Brand

Apollo New Energy Corp

System Cost

Under $3000

System Size

2kW

Installed By

Kdec Electrical and Solar

Panel Brand

LONGi Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)

Panel Brand

Trina

System Cost

$4,000 to $6,000

System Size

5kW

Installed By

Venergy SA Metro

Panel Brand

I don't know

System Cost

$4,000 to $6,000

System Size

6kW

Installed By

Advanced Solar Technology (North)

Panel Brand

Trina

System Cost

$4,000 to $6,000

System Size

5kW

Installed By

Advanced Energy Management VIC

Panel Brand

LONGi Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Hi Geoff welcome to the Delta Team. Were pleased to be able to provide your Solar Inverter Solution, should you ever need any support with the product please contact us at [email protected].
Best regards Mark

Panel Brand

LONGi Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Thankyou Lev for the 5 Stars and welcome to the Delta PVI Group. If we can assist in anyway please contact us at [email protected].

Panel Brand

LONGi Solar

System Cost

$8,000 to $10,000

System Size

10kW

Installed By

Solar Intelligence

Manufacturer Reply

Thanks Scott for the 5 star review. If we can assist you in any further way please contact us at [email protected].

Panel Brand

LONGi Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology Geraldton

Panel Brand

Trina

System Cost

$8,000 to $10,000

System Size

10kW

Installed By

Venergy Pakenham

Manufacturer Reply

Hey Carol, just wanted to say thank you so much for taking the time to leave a five-star rating for our business! Your feedback means a lot to us and we'll definitely be passing it along to the whole team. We're really happy to hear that you had a great experience with us.

Panel Brand

I don't know

System Cost

$4,000 to $6,000

System Size

6kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Hello Richard,
I am thrilled to hear that you enjoyed your experience with our product and that you have given us a five-star rating. It means a lot to us that you took the time to share your feedback. I will be sure to pass it along to our team.

Panel Brand

Winaico

System Cost

$12,500 to $15,000

System Size

13kW

Installed By

Capacity Electrical VIC
Seems to be working ok. We are producing a touch over 50kwh per day

Manufacturer Reply

Dear Tim,

Thank you for your feedback on your solar inverter! It's great to hear that your system is producing over 50kWh per day and that you're happy with its performance.

Panel Brand

Jinko Solar

System Cost

$6,000 to $8,000

System Size

9kW

Installed By

Advanced Solar Technology (North)
We have been satisfied with our inverter but still have a driving question as to why does it go to Derating mode so often. This happened quite a lot in summer and we accepted the fact of so much going back into the grid, however it is still happening during the winter months. We would love a Layman style explanation. Will need to contact our installer again.

Manufacturer Reply

Thanks for the 4 Stars Doug, I am interested to know what didn't make the Delta 5 Stars? Any input is actually forwarded tot he R&D team and taken seriously to improve the product.

It could be something that would be able to be improved via over the air updates in the future.

Shane Arnold

Panel Brand

JA Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
Had an issue with the inverter, Ross from Capacity attended to the issue in a timely manner, organised the replacement and installed it back to good working order. The Delta technicians are based in Melbourne and tested the system fully from their end. Had some issues with WiFi of which have been sorted. Would I go with a Delta inverter next time, possibly not but it is doing it's job now with no issues.

Manufacturer Reply

Hi Julian, thanks for the five stars. Glad Capacity Electrical have you using our key product.

Shane, Delta Australia

Panel Brand

Hyundai Solar

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

Capacity Electrical VIC

Panel Brand

SunPower

System Cost

$8,000 to $10,000

System Size

6.6kW

Installed By

Venergy SA Metro
I have had excellent results with my Delta inverter. It has made a huge difference to my electricity bills and I couldn't be happier with its performance.

Panel Brand

Suntech

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
The inverter itself is fantastic. The cloud based monitoring system is pretty poor unfortunately.
It gives basic details but as much info as I would like.

Manufacturer Reply

Hi Lachlan,

We are finding that the new APP may not be making it to the end user such as yourself. The previous APP is known as My Delta Solar but the NEW app is known as "Delta Solar" which is currently running at 5 stars compared to the old app with 2.8 stars. You can use your normal log-in details for this . Also there is a web based portal with very in depth data available at https://mydeltasolar.deltaww.com/ you simply use your usual login to gain access.

Hopefully this will warrant an update from 4 stars to 5 stars.

Shane, Delta Electronics AU/NZ

Panel Brand

LONGi Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Energy Management VIC

Manufacturer Reply

Thank you for your updated review. Its great to see over time that the product has increased its performance enough to gain more stars. Advanced Solar Technology are a great partner of our products and appreciate your support. Shane, Delta Australia / New Zealand

Panel Brand

Seraphim

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Thanks for the 5 Star review Tony. We appreciate that you have taken the time to rate us and your kind words about Global Solar tell us you are in good hands. Shane

System Cost

$6,000 to $8,000

System Size

6kW

Installed By

Global Solar Solutions

Manufacturer Reply

Thanks for the 5 Stars Chris, We appreciate you taking the time to compliment us and please know if there is any need for support or general questions you can contact us on 1300 335 823 where our Australian based support team can assist. Shane, Delta Australia / New Zealand

Panel Brand

Hyundai Solar

System Cost

More than $20,000

System Size

10kW

Installed By

Natural Solar

Manufacturer Reply

Hi Anne, Thank you for taking the time to review the Delta inverter installed. May I ask why the Delta didn't rate 5 Stars? We have five stars from many others so it would be good to know what we can do to improve the product worthy of 5 stars. In any case we appreciate the 4 stars and hope in time it will show itself worthy of 5 stars. Shane, Delta Electronics Australia / New Zealand

Panel Brand

Seraphim

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Thanks for the 5 stars Malcolm, We are glad to see you have installed Delta and its performance is worthy of five stars. Alex and Michelle from Advanced Solar are a great partner of Delta and have been for the longest time of any partner in Australia, Should you need any assistance or guidance of the use of your inverter our Australian based support team are avaialble on 1300 335 823. Shane, Delta Australia / New Zealand

Panel Brand

JA Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
The Delta inverter has no fan and is silent. A salesman from a different company which sold fronius inverters (which have fans) reckon that’s a problem. But Delta is a massive company with a solid reputation and a 10 year warranty and if there was an issue then SolarQuotes would not recommend them. Plus, it’s silent!

Manufacturer Reply

Hi Bill, Thanks for the positive and thorough review. Sounds like you really investigate the products you purchase and have chosen correctly on great advice from Alex at Advanced Solar Technology. Fun fact, I understand that Advanced Solar Technology is the longest consistent seller of the Delta inverters than any other solar company globally. Never since Delta arrived in Australia has Advanced Solar Technology stopped offering Delta. If you have any queries or needs, please be assured that Alex has the full support of Delta Electronics Australia

Panel Brand

JA Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
clunky app interface

Manufacturer Reply

Hi Brent, Thanks for the information and are concerned that you may be using the old app. We do have a new app which has been released and would be great if you can confirm that you are not using the old version. The new app is simply called "Delta Solar" as opposed to the old app "My Delta Solar". Also if you want to view on the PC we have a web version viewable at https://mydeltasolar.deltaww.com/

Use your normal login credentials to gain access. Hopefully this is enough for you to raise the review to five stars.

Shane Arnold, Delta AU/NZ PVI Manager

Panel Brand

JA Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)
The Delta inverter is still excellent.

Manufacturer Reply

Hi Lorna,

Thanks for the great review and update. I have forwarded this to our R&D team and staff of Delta Global. Thank you again for your kind words and support. Shane, Delta

Panel Brand

Seraphim

System Cost

$2,000 to $4,000

System Size

5kW

Installed By

Specialized Solar
The associated app is not easy to use without some initial help to setup. Once that’s done it’s great!

Follow up after 8-9months: the inverter seems to be working just fine. After initially checking the ap multiple times a day to see how much power is being generated, now I check periodically as I’m satisfied it’s just doing its thing in the background. The ap is ok, provides the necessary data to review, but could probably be more user friendly in its overall design

Manufacturer Reply

Hi Brad, Thanks for the review and returning to provide moreinfo. There is a new APP you may or may not be using. It is simply "Delta Solar" in the relevant store.

We are continuing to improve the APP all the time to meet the various regional requirements.

Panel Brand

Seraphim

System Cost

$2,000 to $4,000

System Size

5kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Hi Rachelle, Would be great to hear any feedback that would have the review at five stars as opposed to four. We are open to making changes to exceed expectations.

Shane, Delta Electronics Australia

Panel Brand

Trina

System Cost

$4,000 to $6,000

System Size

6kW

Installed By

Primero Electric and Solar

Manufacturer Reply

Thanks for the great review Graeme! If there are any questions be confident that Delta Tech support happily engage end users such as yourself.

Panel Brand

Canadian Solar Inc

System Cost

$2,000 to $4,000

System Size

6kW

Installed By

Limitless Energy Group Pty Ltd
Not as straight forward with connecting it to the cloud.

Manufacturer Reply

Hi Wilson, Just making contact here to let you know that a brand new version of the app for Delta inverters has been released and is available on the iOS APP store and Android Play store. The title is simply "Delta Solar" which is in line with our new simplistic approach. Shane. Delta Electronics Australia

Panel Brand

LONGi Solar

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Energy Management VIC

Manufacturer Reply

Thanks for the 5 Stars Michael,

Alex from Advanced Solar Technology is one of the longest consistent retailer of Delta inverters and we even understand that title to be globally.

The Delta product is a great performer in WA and if there are any technical queries you have please call us on 1300 335 823

Shane

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Advanced Solar Technology (North)

Manufacturer Reply

Thanks for the 5-Star review Alkesh,

Great to see that you will be achieving many years of renewable energy production supplied by the great team at Advanced Energy Management.

Shane

Panel Brand

LONGi Solar

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

Advanced Energy Management VIC

Manufacturer Reply

Thanks for the five stars Rob!

We work hard at Delta to deliver quality products that meet the requirements of all regions. To see another Delta achieve 5 Stars in Tasmania is exciting.

We welcome you to the team of people using Delta to generate their renewable energy.

Shane

System Cost

$4,000 to $6,000

System Size

3.3kW

Installed By

I Want Energy
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