A solar and battery system that works fine 20 km inland can start failing a block from the beach. Salt air settles on the panels, works its way into the rails, clamps and fasteners, and attacks the parts nobody looks at. The damage often only shows up years later, usually when someone goes up to add a battery and finds the roof hardware has seized.
Source Energy Group, a residential solar and battery installer across South-East Queensland, North Queensland, Greater Sydney and Newcastle (QLD ECL 1513399, NSW ECL 503567C), designs every coastal solar battery install differently for that reason. On Off The Grid episode 27, Jason and Cam walk through what salt does to a system, where a battery should go near the water, what corrosion ratings mean on a quote, and the warning signs to watch for. Last updated: October 2026.
Why are coastal solar and battery systems different?
Source Energy Group treats any home close to salt water in Queensland or New South Wales as a different design job, because salt attacks a system in ways an inland install never sees. The episode opens on exactly that point: “Salt air can silently destroy parts of the system that you can’t see.” Get the panels, mounting or installation method wrong on a coastal home and, as the hosts put it, the problems “only become apparent years later”.
Salt shows up in two places. On the front of the panels it leaves a film, and the glass turns hazy or cloudy, the same way your windscreen looks after a drive to the beach. Out of sight, it corrodes the metal: rails, clamps, fasteners and the cabling that runs up to the roof. It is not only beachfront homes either. The hosts point out that if you live on a canal or right next to a river with salt water, the same thinking applies.
Can you add a battery to existing solar on the coast?
Source Energy Group can add a battery to existing coastal solar, but the roof gets checked first, because the installer who connects a battery to those panels becomes responsible for them. That is where the hosts start. If the crew goes up and finds improper fastening, or panels that were never designed to sit near the water, connecting a new battery to them can cause warranty problems once everything is installed.
For an older coastal system, the hosts say you are likely to be better off upgrading the panels themselves, and the mounting too if the wrong rails went on from the start. Adding a battery also means checking how the existing array is wired so it can be connected properly to the new inverter, and that often means lifting panels.
That is where corrosion bites. The mid clamps that hold the panels together are the weak point. “In 90% of cases they will be corroded,” the hosts say, and when you undo them they spin inside the rail and cannot be put back. It damages the mounting structure as well. Adding a battery to a coastal roof is “not as simple as many people think”. Source Energy Group applied the same ownership rule on an earlier episode, where an existing install was brought up to standard before the battery went in.
Where should a battery be installed near the coast?
Source Energy Group’s advice for coastal homes is to put the battery in the garage, not on an exterior wall. On the episode, the hosts say batteries near salt water are “definitely better installed in a garage, not on an exterior wall”, which is where most homes have them. With the battery inside, an internal DC line can run up to the roof, so much of the system is sheltered and only the panels and roof mounts stay exposed.
If a garage is not an option, use a protective case. The hosts describe a job in Currumbin on the Gold Coast, where the homeowner lives a block from the beach. The spot he chose for the battery prompted a simple call: “This really needs a case”, for a little protection from the salt air and salt fog. Ask two questions about any cover: will it actually keep the salty air out, and does the case itself carry a protection rating?
What should you look for in a coastal solar battery?
Source Energy Group’s hosts point to the IP rating when choosing a battery for the coast, and they single out the GoodWe ESA here: its IP protection class is one of its strengths, and it is rated IP66. They also name Tesla Powerwall, BYD and Sungrow as batteries with high IP ratings for harsh outdoor conditions.
An IP rating covers dust and water. It is not the same thing as a corrosion rating, so check both against the spot the battery is going. A well-rated battery still does better in a garage than on a wall facing the sea. For a broader comparison of brands, see the 2026 solar battery brand rankings, or read how Source Energy Group sizes and installs home batteries.
What do corrosion ratings mean on a solar quote?
Source Energy Group reads a corrosion rating the same way it reads wind and IP ratings: as proof that a product is fit for where it is going. The hosts describe a corrosion category such as C5. The higher the number, the harsher the corrosion the product is rated for. It sits alongside wind load ratings, which differ from building to building, and IP ratings for dust and water.
For mounting in a high corrosion zone, the hosts say to look for galvanised hardware and materials with their own corrosion resistance class, and they mention Clenergy as having good coated options. The fine print matters as much as the brand. Some data sheets call for changes in coastal zones, such as different screws and closer fastener spacing. Here is what the hosts suggest checking on a quote for a solar system near the water:
- Panels: corrosion resistance on the panels themselves.
- Fasteners: the type of fasteners and mounting written into the quote, not left vague.
- Fastener spacing: the spacing in the mounting data sheet followed for your zone.
- Wind load: loads are higher in North Queensland, from cyclonic zones to high wind zones, and the hosts mention looking at higher-load areas around Bundaberg recently.
- Every data sheet: panels, mounts, inverter and battery, checked for corrosion resistance and wind load ratings.
For more detail on hardware grades, read the coastal solar and battery installation guide.
How far from the beach is a high corrosion zone?
Source Energy Group works from the figure the hosts give on the episode: within about 500 metres of salt water is treated as a high corrosion zone. In practical terms that is roughly one or two blocks from the beach, depending on block size. The hosts do not treat 500 metres as a hard edge. In their view it is worth pushing a little further beyond that limit to be safe.
If your home sits in that band, coastal-rated hardware is something to see in the budget, not something to hope was included.
How often should coastal solar panels be cleaned?
Source Energy Group’s guidance from the episode is simple: if you would normally clean your panels once a year, drop that to every six months right next to the water or in heavy salt fog, or even every three months. Salt builds up and builds up over time. The hosts compare it to shading a panel, and it significantly reduces efficiency.
Use plain demineralised water and a soft-bristled brush. Do not use anything corrosive. It can damage the panel and destroy its protective film, and the hosts say using corrosive materials voids the warranty. A lack of maintenance can void the panel warranty too. The panel’s technical data sheet sets out how to clean it, so check that first.
The hosts compare it to a car. You would not drive one for years without a service, and you spent real money on solar to bring your power bill down. Panels on the roof are out of sight, out of mind, which is exactly why coastal homes need a cleaning schedule.
What are the warning signs of corrosion on coastal solar?
Source Energy Group points coastal homeowners to four signs, all covered on the episode:
- Salt on the panels. A hazy or cloudy film you can see. If you cannot get on the roof safely, have someone check for you or have the panels cleaned.
- Rust “snail tracks” down the roof. Rust marks running down from the fasteners.
- Falling production in your app. Production should rise heading into summer, so a flat line suggests something is slowing the system down, and a sudden plunge means something is wrong. In a DC system, one failed panel can shut down the whole circuit, so you might see half the system not working.
- Snail tracks inside the cells. A sign moisture has got into the panel. Salt or corrosion building up in one area can also cause hot spots, shading and reverse current where there are no optimisers or protection devices.
Roof mounts are the most vulnerable part of a coastal system because there is no way to hide them. The hosts have been to jobs where the mounting hardware screwed into the roof could not be unscrewed at all, stuck tight with corrosion. Nobody notices until it becomes a problem.
Why does the installer matter more on the coast?
Source Energy Group’s view is that on a coastal home, the installer’s choices decide how long the system lasts, because most of what matters is hidden once the job is done. Source Energy Group installs with in-house SAA accredited installers who are employees, not subcontractors. Cam has 12+ years installing, and Luke Hoogsteyns and Tim Clarke have 8+ years each. Before a battery goes onto existing solar, the crew checks the roof and the wiring, because whoever connects the battery takes ownership of what is already up there.
The hosts’ closing advice: if you live on the coast, or within a block or two of that 500 metre line, know exactly what products are in your quote, from the panels to the mounts to the inverters to the battery. Then ask your installer three questions. Is coastal hardware in the budget? Is it in the fine print? Is it in the product data sheets they give you?
People Also Ask
Does salt air damage solar panels and batteries?
Source Energy Group sees salt air leave a hazy film on panels and corrode the rails, clamps and fasteners that hold them down. On Off The Grid episode 27, the hosts explain that this damage is often hidden and may only show up years later. A battery can be kept out of the salt by installing it in a garage or a rated protective case.
Where should I put a home battery if I live near the beach?
Source Energy Group recommends a garage over an exterior wall for coastal homes, with an internal DC line running to the roof. If a garage is not possible, use a protective case, as on a job in Currumbin a block from the beach, and check that the case itself carries a protection rating.
How close to the ocean is too close for solar?
Source Energy Group treats roughly 500 metres from salt water, about one or two blocks from the beach, as a high corrosion zone. Solar and batteries still work there, but the panels, mounting and fasteners need to be rated for it, and the hosts suggest allowing a margin beyond 500 metres.
How often should you clean solar panels near the coast?
Source Energy Group suggests cleaning every six months, or even every three, if you are right next to the water or in heavy salt fog, compared with once a year elsewhere. Use demineralised water and a soft-bristled brush, never anything corrosive, and follow the panel’s data sheet so you do not void the warranty.
Can I add a battery to old solar panels on a coastal home?
Source Energy Group can, but the existing roof hardware is checked first, because the battery installer takes responsibility for the panels it connects to. On coastal roofs the mid clamps are often corroded and can spin in the rail when undone, so upgrading the panels or mounting may be the better option.
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Full Episode Transcript
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Guys, solar panels and batteries are not the same as systems for homes 20 km from the coast. Salt air can silently destroy parts of the system that you can’t see. Inappropriate panels, mounting, or installation method can create problems for a coastal homeowner that will only become apparent years later. I’m Jason. I’m Cam. We are the owners of Source Energy Group. We have designed and installed numerous solar and battery systems for Australian In this episode, we’ll break down what salt resistance ratings really mean, what we look for when installing on the coast, and how to avoid unsuitable systems near water.
Welcome back, guys, to a new episode. Today we will talk about installing systems near the coastline. Of course, a large part of Australia is located on the East Coast, you know? So this is a relevant topic, and many people are interested in it on the So, let’s get started, Cam. So, one of the questions we get or see online is: how does salt air affect solar panels, equipment, and The first thing that comes to mind, I think, is Oh, definitely.
Yes. Corrosion, salt fog for your solar panels. They have a film on the surface. If it rains, it may collapse. Your panels are becoming kind of hazy or cloudy in the front, Well, everyone has seen what salt does if you camp out with a tent on the beach on the Yes, she is everywhere in the Yes, on the windshield, of course. Corrosion is a big problem, isn’t it?
Especially now that solar panels have been around for quite some time, but everyone is switching to batteries. So if we install a battery to an existing system right on the coast, that would be a bit of a problem, right? Oh, definitely. Moreover, we know: if we connect these panels to our battery, we are responsible for it So if we go up to the roof and see improper fastening or panels not designed for proximity to water, we take.
So, this may void the warranty after we install everything. Now, when we install batteries, we are 1000% sure that they will be tested. Yes. So, basically, if you have a house with solar panels already installed on the coast and you want to add a battery, it’s likely that you’d be better off upgrading the panels themselves, Oh, definitely, and yes, the mounting system If it is, well, if the wrong rails were installed from the beginning or something.
Or even everything related to the cables that lead up to the roof to the panels. I don’t know if you’ve ever seen objects near water that fasteners or regular clamps. Either way, they’re both rusting. I have a friend who lives near the beach, and in his neighbour’s house, well, you can see the roof right under his windows, it’s all rusted out, even though he did the installation himself.
And he had to go back and replace the mount. Now they are all rusty too. Yes, but… But it was made using the right type of materials. Yes, I guess it’s hard to avoid, but… So even if specifically for coastal areas, it’s much faster than other equipment, right? Yes, 100%. That’s why they put these ratings on you, which you have to… Mhm. So what do ratings actually mean to the this equipment be installed near water or not?
That’s practically everything, isn’t Well, I suppose it’s always a naval rating. So, C5 or something like that. Is this a resistance rating? Corrosion, Yes, the corrosion category. So the higher the number, I’m pretty sure the higher the number, obviously the worse the situation. The higher the level of corrosion. Yes. So, it’s like load ratings, There are different wind ratings for different buildings. Yes. IP rating, dust and water protection.
So there’s a corrosion factor that I think people living near the coast have to Oh, definitely. Install your batteries, etc. Install them Well, it’s definitely a good option, isn’t it? If you live, for example, near a canal or somewhere like that, right next to a river, salt water. Oh, yes. Yes. Real estate on the coast. Such batteries are definitely better installed in a garage, not on an exterior wall, like in many, oh, most homes.
Yes. Certainly. Now you can buy protective covers for them. They are quite well protected. But then again, will this casing be enough to keep out the salty Yes. And also, will it itself have the protection class? Yes. Certainly. To avoid So what do you think is most vulnerable? Apparently, the mount, or are these battery components? I would probably say an Roof mounts holding solar panels. They’re probably the most vulnerable and the most critical because you have no way to hide them.
Whereas with the battery, which we just talked about, you can put it in the garage. You can run an internal DC line to the roof. Everything else can be partially But when it comes to solar panels and roof mounts, I mean the mounting hardware that screws into the roof and secures the panels. I’ve been to a bunch of objects where they can’t be unscrewed at all. They were stuck tight due to corrosion.
Yes. It only seems to become a when there is a problem, doesn’t it? Or, it’s not a problem until it becomes a 100% of the time. So, Well, the hardest thing about them being on the roof is that they’re out of sight, out of mind. People don’t think about this as often as they should. Once the panels are installed, people don’t really think about the fact that they may need to be cleaned or maintained to efficiency.
And yes, you spend a considerable amount of money trying to reduce your electricity bill. Yes, as we said in previous episodes. It’s like car maintenance. You wouldn’t just let the car drive around without maintenance. Same with solar Yes. I guess, in terms of this, as you were talking about the plaque on the panels that we see, you know, you drive to the beach, it’s going to be all over car.
Oh, yes. Solar panels will be exactly the same if they are standing near water, right? Yes, definitely. In general, it’s a good habit to clean your panels regularly, but those who live on the coast probably have to do it much more often, Yes. Well, in the maintenance schedule you provide to the customer, you could take that into account. For example, if you clean your panels every year, reduce this period to 6 months if they are located right next to water or in an area with heavy salt fog, or even to three.
Yes. And when they wash off this salt coating, what is the best way? I would still stick with plain demineralised water and a soft-bristled brush. Do not any corrosive This will damage the panel and destroy the protective film on it. Which, really, boils down to the fact that a homeowner can always look at the technical data sheet for these panels, right? Yes, that’s right. It clearly states exactly how to clean them effectively.
100% yes. Which is exactly what you Yes, yes. No corrosive Yes. Using any corrosive materials voids the warranty, right? Yes, that’s right. Additionally, lack of may also void the warranty on these panels Do you know what distance is considered safe, or what distance is not considered a high corrosion zone from the coast or from the I’m thinking salt water. I mean over 500 metres. I still think it’s worth pushing a little further beyond that limit.
Yes. There are…well, as with load zones, there are probably corrosion zones as well. It says: yes, 500 metres, but it to be safe. So, what are these 500 metres, essentially? Probably one block from the beach. Yes, within one block of the beach. Yes, you could say that this is considered a high corrosion zone. So, if someone is in these corrosion areas where they have to fasteners and all that, are there any specific materials that they should look out for?
Or look in the estimate? Galvanised, as well as class H materials, have their own corrosion resistance class. So it’s worth choosing just those. I know that Clenergy has pretty good options with coating, they do that too. The only thing you need to do is study the technical each product in detail. They replacing certain parts of it. So, protection, replacement of screws and reduction of the fastener pitch.
So they are resistant to Yes. So, I think if you live close to the beach, like we say, a block or two away, that’s something to look at in your budget, right? Is there anything else that should stand out to make sure it’s a good offer? Corrosion resistance in the, panels themselves. Make sure they follow the fastener spacing for your mounting Yes, that’s very close to the truth.
Everyone should indicate in their estimates what type of fasteners They must also corresponding act upon completion of the Yes. I think the pitch of the fasteners also depends on the since you are closer to the water. Well, you know, in northern Australia, in northern Queensland, the wind load is, of course, higher than in From cyclonic zones to high wind zones, and I think we looked at that recently, it was Bundaberg and that.
These were areas with higher loads. Yes. Around there the situation starts to change. Yes. Perfectly. It seems like we’ve covered almost everything, right? Yes, there is, of course, a technical term, 500 metres. I think it’s probably one or two blocks from the beach, depending on the size of the And, you know, if you have a battery, if you’re this close to the ocean, it’s better to install it.
If you can’t install it in a garage, be sure to place it in a protective case. We had one such case in Currumbin. He lives a block from the beach, and when we were the system, the location he chose was, “This really needs a case, you know?” A little protection from the salt air, salt fog and all that.” Mounting is an important consideration, especially if they already have an existing system and want to add a battery.
Most likely, if the installers are doing everything right, they should check how the system is connected, Yes, definitely. So they can properly connect this to the new inverter. If they’re check how system is wired, they’re probably going to have to remove the panels, right? Oh, definitely. Which could damage the existing installation underneath them. That’s right. So it’s not as simple as many people think, it’s not as simple as saying, “Oh, we’re battery to this system,” right?
No, definitely not. Well, it’s called the middle clamp that holds the panels together. In 90% of cases they will be corroded and when you pull them out they will just roll inside the mount. It will be impossible to put them back. This also damages the mounting structure itself. OK. Look, it’s pretty simple. If you live near the coast, there are a few more things to look out for.
There are corrosion resistance ratings, wind load ratings, and it’s worth looking at specific products to see what their ratings are, I guess. Yes. Yes, ask your installer. Is this in the budget? Is it in the fine print? Is this in the product data sheets they provide you? Yes. After the work was completed, did the installer sign this Okay, guys. So, if you live on the coast or within, you know, a block or two of that 500 metres of just make sure when you get a quote that you know what products they’re using: from the panels, to the mounts, to the inverters, to the battery.
Just look at the technical data sheets, learn corrosion resistance and even wind load ratings. One of the main problems is that the salt buildup will just build up and build up over time. It’s essentially like shading a solar panel, Yes, actually quite significantly, yes. This simply significantly reduces the efficiency of this solar panel. So there are some signs that this is Yes, definitely. Well, first of all, you can see it.
But if you can’t get up on the roof and see it, someone else will go up and look for you, or you can have the solar panel cleaned. But, as far as the fasteners are concerned, you might start to notice rust marks, like “snail tracks” of rust or something like that, coming down your roof. But what about, they’ll see it in their electricity bills over time, right?
Especially nowadays, if the applications and You see a decline in production, right? So, we will see a This will be a good indicator that the panels are dirty. You know, if something goes wrong in the system, production will just plummet, right? This indicates that something is completely wrong. But you know, as summer approaches, productivity should increase a bit. So if you see a production line, that probably indicates that something is slowing it down, right?
Yes. In a DC system, if one panel goes out, the entire circuit is shut down. So, yes. This can be a alarm signal. You will see that half of the system is not working. Well, on solar panels, you’ll start to see “snail tracks” inside individual cells. This moisture gets inside the panel substrate. Maybe it’s starting to wear out. Hot spots appear because too much salt, corrosion, or something else has accumulated in one area.
This causes shading and reverse current if there are no optimisers or protection devices. This humidity inside, it’s all because of the humidity on the coast, right? Maybe so. It may be due to a damaged substrate Well, anything can lead to moisture ingress. And you can’t see the underside of your system. So that’s a good sign to look out for when you’re there. And humidity, of course, is usually higher on the coast, Oh, yes.
Yes, she would be there And we are, of course, talking about GoodWe ESA. And again, you don’t want to put it right on the But one of the best of the best The best. The best. One of the strengths of ESA, or the best aspects of ESA, is its IP protection class. It is designed to work effectively in areas with high Yes, you can google whether there is a battery system designed for use right by the beach.
Tesla Powerwall, BYD and Sungrow have high IP ratings for harsh outdoor Yes, the IP protection class of GoodWe ESA is IP66. And what is the IP class of Sig? Tesla Powerwall 3, no specific restrictions on distance from the coast, 66. Tesla Powerwall 67. IP rating. So guys, if you live on the coast, have high electricity bills and want to reduce them as soon as possible, contact us and give us a
Salt air does its damage slowly and out of sight, which is why a coastal solar and battery system has to be specified for where it lives. Source Energy Group, a residential solar and battery installer serving South-East Queensland, North Queensland, Greater Sydney and Newcastle, keeps the battery out of the salt air wherever it can, checks the roof before connecting anything, and writes the hardware into the quote. That is how you Break Free From The Grid without a corrosion bill turning up years later. Book an energy audit if you want your own home and roof looked at properly.