Your Solar Panel Warranty : What you need to know

solar panel warranty choices

What warranty are you really getting?

One of the most important things you have to watch out for when buying solar is the warranties that are offered. All too often people end up going with a cowboy firm because they have been reassured by their “25 year solar panel warranty”. What many people don’t realise is that, in reality, this warranty can be worthless.  You really need to understand how solar warranties work when you are buying a system that is designed to last 30 years or more, so you can separate the worthless promises from the genuine guarantees…

This guest post has been written by  solar industry insider: Eric Nicholas, CEO of Jim’s Solar. Here Eric explains everything you need to know to make a fair comparison of solar panel warranties, solar inverter warranties, and solar installation warranties.

Over to Eric…

When buying a PV system one of the most important things you will need to consider is the warranty being offered by each Installer.

There seems to be a lot of confusion when speaking with our potential customers as to what exactly they are getting in relation to their warranty. We find most people when asked the question will say something like “ the sales guy from the other Company said that their system has a 25 year warranty”.

We explain to the customer that they in fact get 4 separate warranties with a PV system. It is usually broken up into the following;

  1. Panel performance warranty – 25 years (Industry standard)
  2. Panel product warranty – typically 5 or 10 years.
  3. Inverter warranty – usually 5 years (sometimes offered with a 10+ year optional upgrade depending on manufacturer)
  4.  Installation warranty – usually 1 or 2 years and can be up to 10 years in some cases (Provided by the installer)


1) Solar Panel Performance Warranty

The performance warranty is to warrant the degradation of the cells over 25 years. The manufacturer may state that the performance will only reduce by say 10% after the first 10 years and then another 10% over the next 15 years. You will find that this warranty is fairly standard across most manufacturers.

Performance Warranty Warning: Many solar industry insiders consider the performance warranty practically worthless, little more than a marketing exercise. This is because it is very easy for the manufacturer to wriggle out of it. But fear not – there is a solar panel warranty that you can rely on. The product warranty.


2) Solar Panel Product Warranty

The product warranty is to cover defective materials or workmanship in the manufacture of the Panel. It is provided by the manufacturer of the Panel, not the solar installation company.

It is very important that your panels’ product warranty is at least 10 years. If you were to make a claim for faulty performance or worse, no output at all, you can be assured you will be covered under the product warranty.

As touched upon earlier, it is critical to realize that most companies that spruik a “25 year warranty”, are talking about the performance warranty. This means that any faults due to poor workmanship or materials can be argued by the panel manufacturer to be only covered under the product warranty, which in some cases may only be 5 years.

So please make sure you check the type of warranty before buying.

Insurance Backed Solar Panel Warranties

Some manufacturers will back their warranty with an insurance Company. This is to give the consumer the peace of mind that if anything were to happen to the Company, they will still have their warranty. I am not aware of any claims being made to date so cannot comment on whether this is something to consider when making your purchase.

 Checklist for comparing solar panel warranties

1)      Check the “Product Warranty period”

2)      How long has the Company been manufacturing Solar panels?

3)      Production volume will give an indication of size of the manufacturer. Bigger manufacurers are generally higher quality and less likely to go broke.


3) Inverter Warranty

 The inverter warranty is probably the most important warranty you will need. The reason for this is because this is the component of your system that is most likely to fail. They are working day in, day out at high voltage.

Inverters generally will have a 5 year warranty. Upgrades to 10 years are available with some brands depending on the manufacturer. Reliability can vary and in some cases can be difficult to determine when faced with all the different brands on the market. Be sure your installer positions the inverter correctly with adequate ventilation. If it is not installed as per the manufacturer’s specifications your warranty will be void.

I have seen indoor inverters mounted outdoors without a weatherproof enclosure. The other common error is the installer has mounted the inverter too close to the adjacent wall, not leaving the required 200mm to allow the unit to dissipate heat. Ventilation is very important particularly with the inverters that have a transformer.

In situations like this, you will need to contact your installer to cover the necessary repairs and to reinstall the unit according to the installation manual.

Checklist for comparing inverter warranties

1)      Check the “Warranty period”

2)      Do they offer a “Replacement” warranty?

3)      Do they have a service centre in Australia?

4)      How long has the Company been manufacturing Inverters?


4) Installation Warranty

The final warranty, the installation warranty, is also very important. You need to assess what will you be charged for in case of a breakdown. It is the Company’s policy that is important here. Will you have to pay for a service call if one of the components fails? Does the Company take care of the entire system if there is any problem?

You will find this warranty can vary significantly between installers. The determining factor can be whether the Company uses their own electricians, or contractors. You may find with the latter, the warranty will generally be a shorter period and response times to a warranty claim may take a lot longer. In this case, it is more important to use a local installer.

Ask your installer if the installation warranty includes call out fees. If you have a situation where a $2.00 component like a circuit breaker is faulty, a service technician may want to charge for a call out, even within the warranty period. Personally, I believe that service calls like this should not be charged for.

Also ask your installer if the installation includes a “Back to Base” warranty.

“Back to base” means that if any component of the PV system you have purchased is faulty, it is up to you to remove and return the goods to the manufacturer for repair. It is also then up to you to have the product reinstalled, at your cost. You really don’t want to foot the bill for the removal and refitting of a panel or inverter.  Solar accredited electricians are expensive – I should know, I have enough on my payroll!

The length of the installation warranty also tells a lot about how confident the installation company is in the quality of their installation.

Checklist for comparing installation warranties

1)      What is the period of the installation warranty?

2)      What exactly does it cover?

3)      What is there average response time for a call out?

4)      What is the warranty on the cables and components they will use on your installation?


Spending a bit of time examining the warranties you have been offered will give you a good insight into how all the different companies operate. This may help you to make your mind up about whom to place your order with, so you have more to consider than just the price tag. I understand it can be a little confusing when entering into the world of Solar, but it really shouldn’t be.

Finally, remember to read all paperwork before you sign and don’t be afraid to pepper the salesperson with lots of questions if anything at all is not clear.

Eric Nicholas


Jim’s Solar

About Finn Peacock

I'm a Chartered Electrical Engineer, Solar and Energy Efficiency nut, dad, and the founder and CEO of I started SolarQuotes in 2009 and the SolarQuotes blog in 2013 with the belief that it’s more important to be truthful and objective than popular. My last "real job" was working for the CSIRO in their renewable energy division. Since 2009, I’ve helped over 700,000 Aussies get quotes for solar from installers I trust. Read my full bio.


  1. im puting on a 5kw sma inverter but not sure wat panels to use had quotes for canadian solar polys renesola suntech australian solar panels or are monos better please help me decide

  2. hi Finn Peacock, just to say thank you for the advice on warrantys, i have seen a solar power add today on morning t.v , do you recomend their warrantys? it is called Tru Value Solar . also not sure in the fine print they ask to pay for any extra connection’ s to the power company buy back sceme is on the customer, generaly how much could this amount to. cheers and keep the good work up mate…claude…

    • Finn Peacock says

      Hi Claude,

      Personally I’m not a fan of True Value Solar. If you do some Googling of “True Value Solar Complaints” and “True Value Solar ACCC”, you’ll see why.

      Some people say that their bad behaviour is all in the past and that they are better these days. I’m yet to be convinced.

      Expect to pay $300-$600 for connection.

      Also they used to insist that you paid a regular “maintenance fee” to keep the installation warranty which was hundreds of dollars every year or so. Check whether they still do this – as it is not needed and will eat into your payback!

      Whatever you do – I’d recommend getting other quotes to compare.

      Hope That Helps,


      • Hi Finn,
        I have got CheetahPlusJKM360-380M panels with Fronius 5.5 KW interver installed by REGEN in Perth WA. The Panels are installed in two banks of 6 and 12 in an orientation that atleast for 4 hours in a day direct Sun will be on the Panel Banks. Being producing 48VDC per panel, both the Solar Panel Baks should be generating 288 and 576 VDC respetively.  Even if you consider the guaranteed efficiency factor they should generate a minimum of 279 and 559VDC respectively. From the Graphs that are colleted so far,I can see the voltage of 6 Panel bank has never gone beyond 221 V and for the 12 Panel Bank, it has never gone beyond 440V.
        The above readings are noted on 22nd, 23rd and 24th of Feb, when the Sun light is full and at 40, 35, 33 Deg C temp.  There are no clouds in any part of the day. Means that 6 Panel Bank has ONE FAULTY Panel and 12 Panel Bank has minimum TWO FAULTY Panels.
        When I asked REGEN, after 20 to and fro communications, they are stating that they will test each panel and chage me $ 2,350. Are the REGEN company not responsible for the Performance / Product and Installation Guarantee as I have dealt with them only but no one else? Please advise me how to deal with them in this regard.

        • Ronald Brakels says

          Hi Murali

          The first thing to do is check if there is a problem with the output of the system. With 18 panels of 370 watts each in Perth I would expect around 10,900 kilowatt-hours a year. In April I’d expect an average of around 25 kilowatt-hours a day. This site will give an estimate of how much energy you can expect a solar system to have produced over the past 7 days based on local weather conditions:

          If, after entering details for your system, you see it is producing around the estimate it gives, then it means there shouldn’t be a problem with your system.

          If your system is under producing and it’s a problem with the system itself rather than dirt on the panels, then the installer has a responsibility to provide you with a remedy under Australian Consumer Guarantees without you being out of pocket for any expenses. But if there is no problem they can charge you for checking the system, so it is very important to check its energy output first. (But regardless of the situation $2,350 is an excessive amount to check 18 panels.)

  3. Steve Quetti says

    Hi Finn, I have been waiting for a container to arrive with some Seraphim Panels.
    When I ordered them they were 40mm thick and the panels that have arrived are 35mm thick, was told this is because the company wanted to make the panels more appealing on the roof. I’m wondering if a thinner panel will perform the same?

    • Finn Peacock says


      I’m guessing that the 5mm reduction is in the aluminium frame? If so – that should not affect performance. It might make the panels a little less rigid though – so be careful they don’t flex too much under installation and damage the cells.


      • Steve Quetti says

        Thanks for the reply Finn, My main concern is that the panels were supposed to be 19.5kg , the panels that arrived have a sticker saying 18.5kg and when I weighted one it was 17.8kg. Does the weight of a panel reflect the performance , meaning less silicone, less weight, less performance.


        • Finn Peacock says

          I don’t think it will affect the performance. The weight savings are probably structural, rather than silicon. You would have to remove a huge percentage of silicon to remove 1.7kg as the cells are only about 1 mm thick.

  4. Hi Finn, I know your not a fan of tilt panels but I need to lift 12 / 250w panels from my south facing roof to face north. Is there any type of tilt kits that you might recommend. I live in Mackay Qld ( 2 km from coast), my roof is 22deg so will need to lift them 44deg to face north to slope the same as the north facing panels, unless it is better to lift to a different angle.
    Can you help. Steve.

  5. MatthewCooper says

    On the performance warranty of the panels would it not be easier to monitor / prove performance out side of the gamut by using micro inverters?
    or are they that slippery that the performance warranty really is just marketing fluff?

  6. brian springer says

    the world is a much better place for having people like Finn Peacock

    • Hi there, is a 12 months installation warranty the norm or there should be a longer warranty?
      Thanking you for your prompt reply.

      • Ronald Brakels says

        Hello Maria

        A 12 month installation warranty is definitely what I would call short these days. On the other hand, if there is a probablem it will usually be noticeable within 12 months. But note that just because the installation warranty is over it does not mean you are not protected. Australian consumer law still applies regardless of what warranties say and — while I’m not a lawyer — if a solar installation company was responsible for a problem I say they have a responsibility to fix it regardless of when they caused it. Of course it’s always better not to have to fight a company to get them to do what they should under consumer law.

  7. Jennifer Martel says

    hi, I am wondering where to see the installation ISO standards for solar panels? I am wondering if a possum which is common in my area was to chew through a cable, would I be under warranty? I am thinking cockatoos and other animals are well known to eat cables and perhaps it is covered in the code?

  8. My 8 years inverter decided to stop working. Currently only have 1.5kwh solar. I am looking for the replacement inverter and installation.

    I had a quote from some solar company. He suggested for me to put the new system 3kwh with canadian solar and 3kw zeversolar inverter.
    And replacing my existing inverter with brand new aerosharp but no warranty as the company no longer exist but guarantee working. (He asked $250 for the inverter plus $220 installation)

    Should I add more panel, or its better to replace the inverter only but with better brand

    • Ronald Brakels says


      The first thing to consider is whether or not your current solar system has an old high solar feed-in tariff locked in. If you do it can definitely be worthwhile getting your current system restored to working order. If you don’t you have the option of getting rid of our old system and getting one large new one.

      Assuming you want to keep your old system then having a new inverter for only $250 is a low price. Aerosharp inverters can’t be used in new installations any more, but if it being used to replace like for like there should be no problem.

      Provided the price isn’t excessive and the installer does good work it normally make sense to install more solar. This article shows the simple payback times for solar in the capital cities are mostly very good:

      The article looks at 6.5 kilowatt systems. Normally you will pay more per kilowatt for a 3 kilowatt system, but many people will still find it worthwhile.

  9. Thanks for your reply.
    Yes, i do have premium FIT, and decided that i think its better to change the inverter and after 2024 probably will change to the bigger capacity.

    The question now is which inverter should I get, should i get more expensive one to replaced the old one with 5 more years warranty or go ahead with aerosharp but without warranty

    • Ronald Brakels says

      A low cost new 1.5 kilowatt inverter is likely to cost $600 or more. If the Aerosharp inverter is new then the odds are it will last more than 5 years they used to be warranted for. Note that while it’s not covered by a manufacturer’s warranty you are still protected by Australian consumer law and the inverter should last for an amount of time that is reasonable given what you pay. As a guess I would say it would be reasonable to expect to last at least two years.

  10. Darien levett says

    If solar fails good luck getting installed buck I was told by consumer affairs go to v cat or hire lawyer not regulated properly Darien Lovett miners rest vic

  11. Vicki Crawford says

    Hi Needing advise regarding a 11 mnth install on Roof Solar Hot water system and one solar panel is showing the whole panel —internal condensation showing now for approx 1.5 weeks and have rung the company where we purchased from and now being told they will contact the (other) company that sell the solar panels to them to contact me. So long story short they have rung me and said they will put a weeping hole into the panel and my concerns are if its already showing issues will this rectify the condensation and will it mean the panel isn’t operating as it should and can i expect future issues? I would appreciate your feed back
    Cheers Vicki


  1. Are you getting the Best Solar Panels? 10 Things To Check says:

    […] claim to have a minimum 25 year Power Output Warranty. I’ve covered the common myths about solar panel warranties here. But the main criteria is to check that the Warranty is backed by an Australian Entity that has to […]

Speak Your Mind

Please keep the SolarQuotes blog constructive and useful with these 5 rules:

1. Real names are preferred - you should be happy to put your name to your comments.
2. Put down your weapons.
3. Assume positive intention.
4. If you are in the solar industry - try to get to the truth, not the sale.
5. Please stay on topic.

Please solve: 15 + 5 

Get The SolarQuotes Weekly Newsletter