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Hyundai 300w Solar Panels - Thoughts?

SolarOhio

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I have an opportunity to snag some new Grade A 300w Hyundai panels by driving a few hours away. I don’t really see enough reviews/prices on them to know if they’re worth the effort, but $180 +tax each seems pretty tempting. I have plans for future residential application. Anyone familiar with Hyundai solar equipment? Seller via Craigslist, but these are the panels: https://www.ecodirect.com/Hyundai-HiS-S300RG-BF-300-Watt-Mono-Solar-Pane-p/hyundai-his-s300rg-bf.htm

I’m sure if I should buy just a pair or enough to raise a lot of questions from my wife ?
 
194.4/300 = $0.65/W - not bad. About a year ago, I obtained 18 Talesun 330W panels for $159 each delivered as part of a group buy of two pallets (54) of panels.

It's not a bad deal, but it doesn't seem like a great deal.
 
194.4/300 = $0.65/W - not bad. About a year ago, I obtained 18 Talesun 330W panels for $159 each delivered as part of a group buy of two pallets (54) of panels.

It's not a bad deal, but it doesn't seem like a great deal.
Is mono glass panel technology really at a point where I should just focus on price per watt and brand doesn’t make too much of a difference in performance or lifetime?
 
"Mono" is just a word they use to charge more than "poly". In extremely limited situations, they have an infinitesimal performance advantage (fractions of a %), but they are generally not worth the cost.
 
@snoobler has more experience than me about the difference between Mono and Poly. My comments were just meant to suggest that Hyundai is a large Korean Chaebol that has gained a good reputation. They are not a start up.
 
You are going to want many identical panels for residential applications, not just two. Typically 2 kW to 10 kW worth.
Especially if you use high voltage string inverters, which typically accept up to 600V (max on record cold day).
The inverter will also have a minimum operating voltage on a hot day, sometimes 250V or 350V.
I use strings of 24, 12V panels, 12, 24V panels, and 8, 36V panels.
And then there is how many strings to put in parallel.
Sometimes you will make strings a bit shorter, to get the right number of watts.

In other words, you need to select your inverter or charge controller to buy the right set of panels.
(Or else do what I do, buy a hundred at a time and change you mind several times about which inverters to use.)

Check out SanTan Solar (search this forum for comments.) You'll be surprised at how many watts you can get for as little as $500 or $1000.
Some of his panels are new, some used, some have had UL stickers stripped off.
 
For some reason in my area of Northern California there were a lot of used 305 Watt Sunpower panels. They were 96 cell panels that were about 10 to 15 years old that were coming off commercial buildings. They cost between $90 and $100 each which was a little over $0.30 per Watt. Each market has its own stories.
 
I bought 4 brand new 375w panels with warranty shipped to Ohio with dropgate service to my door for under $200 per panel all costs included from SanTanSolar.com

Around 50 cents per watt.
 
You are going to want many identical panels for residential applications, not just two. Typically 2 kW to 10 kW worth.
Especially if you use high voltage string inverters, which typically accept up to 600V (max on record cold day).
The inverter will also have a minimum operating voltage on a hot day, sometimes 250V or 350V.
I use strings of 24, 12V panels, 12, 24V panels, and 8, 36V panels.
And then there is how many strings to put in parallel.
Sometimes you will make strings a bit shorter, to get the right number of watts.

In other words, you need to select your inverter or charge controller to buy the right set of panels.
(Or else do what I do, buy a hundred at a time and change you mind several times about which inverters to use.)

Check out SanTan Solar (search this forum for comments.) You'll be surprised at how many watts you can get for as little as $500 or $1000.
Some of his panels are new, some used, some have had UL stickers stripped off.
The two panel application is just for a small solar shed. I was wondering if I should pony up for about 4kw of matching panels now even with my primary residential application at least a year away. But it seems like I should be able to find a better deal if I hold out.
 
Consider your roof area (assuming that is where you plan to mount them) and exactly how they will fit.
We have a bunch of rules now like 3' walkway on two sides and top edge, fireman access. (for some reason I don't see panels and rails hanging out over the lower edge like an awning.)
If your space is limited, exact panel size may determine what fits the quantity you want, and perhaps the right voltage per string. Some inverters have multiple MPPT inputs, some allow wider voltage range, but avoid boxing yourself into a corner.

If you check the rules and plan your design then you could buy what satisfies requirements. Buying a couple extra panels takes care of possible shipment damage and the spares could go on your shed. 3 or 5 kW of panels should fit easily behind the couch until you are ready to install them. Panels are so cheap, make as big a system as will fit. Make sure you will be a net producer, not a net consumer, during late afternoon. Otherwise punitive utility rate schedules forced on PV system owners may give you an unpleasant surprise.

I keep saying prices can never get lower. I paid $5 and $4/w over 15 years ago. Then I had a chance to double the number of Sharp 165W panels I had buying used ones for only $2/W. I've recently added a huge quantity of SunPower for $0.35/W (decided to pay a premium for top name panels), but some brands (and some non-UL, not good for rooftop) are as little as $0.20 and $0.14/W.
 
Resurrecting this thread as I'm considering these 300W Hyundais at $84 each ($0.28/W). With current $150 pallet shipping promo comes out to around $100 per panel for qty 10.


My question is if I'm giving up any performance during cloudy/non optimal conditions versus pricier panels? Seems like it's more cost effective to get more of these than say pricier per W bifacials etc?
 
Watts are watts. The literature claims these panels have better low light performance, but compared to what? Huyndai makes larger panels now, as do most manufacturers. Do they use the same technology?

I questioned Signature Solar about these panels. If I recall correctly they are from a large installer that bought truckloads of them but didn't use them. So basiclaly, new, but old stock.

I bought a pallet.
 
Watts are watts. The literature claims these panels have better low light performance, but compared to what? Huyndai makes larger panels now, as do most manufacturers. Do they use the same technology?

I questioned Signature Solar about these panels. If I recall correctly they are from a large installer that bought truckloads of them but didn't use them. So basiclaly, new, but old stock.

I bought a pallet.
Thanks for your feedback, just pulled the trigger on 10 of them.

Going to run 9 of them in 3S 3P on my 150/35.
 
I'm still having discussions with "The Boss" about how big our patio cover will be so haven't put any up yet.
My town apparently has a limit of 25kW or 110% of actual util of panels for ground mount, and everything needing to be at the latest "codes". So I may mount them vertically on the side of my 18' utility trailer to maximize winter harvest and then go from there.
 
Watts are watts. The literature claims these panels have better low light performance, but compared to what? Huyndai makes larger panels now, as do most manufacturers. Do they use the same technology?

I questioned Signature Solar about these panels. If I recall correctly they are from a large installer that bought truckloads of them but didn't use them. So basiclaly, new, but old stock.

I bought a pallet.
Not so sure. The Solarever panels I got from SS are mono PERC. These are supposed to capture more from lower light levels, according to google searching. I've been looking at these panels, as they are smaller, so could fit more in a triangular area I want to use. But, they are not PERC, but crystalline. How much less efficient? 18.1 vs 20.9. The more efficient the panel, the less area it covers per watt. If I did the math right, If you grew the Huyndai panel to be the same watts as the Solarever 455, it would take up nearly 54 more square inches. Not a big deal with a few panels, but start filling a roof, that adds up.
 
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Not so sure. The Solarever panels I got from SS are mono PERC. These are supposed to capture more from lower light levels, according to google searching. I've been looking at these panels, as they are smaller, so could fit more in a triangular area I want to use. But, they are not PERC, but crystalline. How much less efficient? 18.1 vs 20.9. The more efficient the panel, the less area it covers per watt. If I did the math right, If you grew the Huyndai panel to be the same watts as the Solarever 455, it would take up nearly 54 more square inches. Not a big deal with a few panels, but start filling a roof, that adds up.
A watt is still a watt. these were 28¢ a watt ... for new panels. Mounting a couple more panels doesn't bother me.
 
Got two of the 300W in parallel hooked up to one of the mppts on my Delta 2 max as a temp test. Angle definitely less than optimum for December.

20231212_140014.jpg20231212_140024.jpgScreenshot_20231212_135736.jpg
 
Rotate to landscape orientation, and the coolers will hold them at a better angle.

I've got a couple SunPower 327W on roof oriented West, feeding a battery charger.
Going to mount a couple of another brand, two orientations and paralleled, for more flat production while testing some equipment.
 
I stuck a couple of mine in the yard for a few hours just to see how they would perform. They were great even lying almost flat. But I didn't want to leave them loose with a storm coming so put them away. Now I am recovering from back surgery and can't bend, twist, push, pull or lift anything at least until I get stiches out in a week, so I can't do any more experimenting.

Now I really need to add at least 2 panels to the system because the Victron VRM solar forcast now expects them to be there and it throws off the graphs. :ROFLMAO:
 
Rotate to landscape orientation, and the coolers will hold them at a better angle.

I've got a couple SunPower 327W on roof oriented West, feeding a battery charger.
Going to mount a couple of another brand, two orientations and paralleled, for more flat production while testing some equipment.
Thanks. Need to get more cable and figure out best way to get them into the house so I don't have to drag the d2m outside to connect.
 
I have 4 of these Hyundai 300w in one array and today was getting 1.15kw from them.

Pretty sure I bought from the same craigslist ad the OP did.
 
I stuck a couple of mine in the yard for a few hours just to see how they would perform. They were great even lying almost flat. But I didn't want to leave them loose with a storm coming so put them away. Now I am recovering from back surgery and can't bend, twist, push, pull or lift anything at least until I get stiches out in a week, so I can't do any more experimenting.

Now I really need to add at least 2 panels to the system because the Victron VRM solar forcast now expects them to be there and it throws off the graphs. :ROFLMAO:
These 300W are about the limit of what I'd want to be hauling around regularly. Bigger panels must be a real handful. Cerbo GX is in the cards soon. Need to step up from what the BT can provide.
 
Thanks. Need to get more cable and figure out best way to get them into the house so I don't have to drag the d2m outside to connect.

Adapters for an extension cord. Maybe tape mated plugs together, so you don't go AC/DC.
Include ground while you're at it, PV frames to SCC or inverter.

Or a roll of UF, is solid core so for less frequent movement. I did that for AC to a trailer in the woods.
I put UF on a spool, with MC connectors, to wire from PV combiner box to inverters I was playing with. Now have some MC4 cables tucked in through the eaves, will later run conduit to a junction box for my lab.
 
These 300W are about the limit of what I'd want to be hauling around regularly. Bigger panels must be a real handful. Cerbo GX is in the cards soon. Need to step up from what the BT can provide.
I went for these because I figured I could install them by myself if I had to. Couldn't do that with the 400+ panels. Now I can't even lift 100 watt panels. :mad: But if everything works out OK with the back I'll be able to do a lot more than I was.
 
I ordered 20 of the hyundai 305w panels from signature (backorder), to replace an array of used 250w panels
no larger panels will fit the ground mount unless I reduce from 20 panels. these will be about 20 percent more watts, plus being new. plan on selling the used 250w dirt cheap to someone local
the 305w are just a hair larger than the 250w so are the perfect upgrade.
wish I could have got the cheap 370w pallets some of you got, but no way to fit my 14 ft ironridge racks
 
Yeah I like the fast ac charging when needed. What panels and config will you use for the two mppt inputs?

I use the Delta in my office as a UPS with the solar out in my shed providing the A/C using pass thru. I ran out of power twice this month after 3-4 days of clouds and it came thru until the next morning.
 
Adapters for an extension cord. Maybe tape mated plugs together, so you don't go AC/DC.
Include ground while you're at it, PV frames to SCC or inverter.

Or a roll of UF, is solid core so for less frequent movement. I did that for AC to a trailer in the woods.
I put UF on a spool, with MC connectors, to wire from PV combiner box to inverters I was playing with. Now have some MC4 cables tucked in through the eaves, will later run conduit to a junction box for my lab.
Thinking of maybe a midnite solar combiner box (MNVP6) on the outside of the house to keep it on the listed/approved side even though it's connecting to an off grid system. I guess there's a 6 string version where you can split of into three breakers for two controllers. Seems more efficient than getting an imo disconnect and then still having to potentially deal with breakers.
 
Depending on series/parallel combination, if no more than 2 strings in parallel into any given MPPT input, you could combine with MC cables and "Y" adapters, all waterproof, bring the wires inside to a disconnect switch. Although switch outside is proper. There are some disconnects rated AC/DC up to 250V that are cheap enough and at the home improvement stores.
 
I stuck a couple of mine in the yard for a few hours just to see how they would perform. They were great even lying almost flat. But I didn't want to leave them loose with a storm coming so put them away. Now I am recovering from back surgery and can't bend, twist, push, pull or lift anything at least until I get stiches out in a week, so I can't do any more experimenting.

Now I really need to add at least 2 panels to the system because the Victron VRM solar forcast now expects them to be there and it throws off the graphs. :ROFLMAO:

Glad to see your endorsement of them. I ordered a pallet (30) 305w Hyundai and they should be here the end of next week. My sympathy on the back surgery. i broke my T-5 Sept 2013 and finally got my surgery April 2017. Gotta love worker's comp. Hope all heals quickly for you.
 
Watts are watts. The literature claims these panels have better low light performance, but compared to what? Huyndai makes larger panels now, as do most manufacturers. Do they use the same technology?

I questioned Signature Solar about these panels. If I recall correctly they are from a large installer that bought truckloads of them but didn't use them. So basiclaly, new, but old stock.

I bought a pallet.
Hey Q-dog, I know this is an old thread but I was just wondering how those Hyundai 300w panels worked out and if you have any updates. I'm thinking about picking up a pallet. Thanks!
 
Hey Q-dog, I know this is an old thread but I was just wondering how those Hyundai 300w panels worked out and if you have any updates. I'm thinking about picking up a pallet. Thanks!
Not sure if you are aware they've been out of stock at sig solar for a while now. Unless you found another source?
 
I had back surgery in early December and it seems to have worked 🤞 but I'm still supposed to "take it easy." SO, I haven't gotten my pergola up yet. We did get a couple of the panels mounted on a temporary rack and there have been no issues.
 
Not sure if you are aware they've been out of stock at sig solar for a while now. Unless you found another source?
Oh thats a bummer, they are a good match for the setup I want to build. I will have to give them a call and see if they expect any more coming in.
 
I had back surgery in early December and it seems to have worked 🤞 but I'm still supposed to "take it easy." SO, I haven't gotten my pergola up yet. We did get a couple of the panels mounted on a temporary rack and there have been no issues.
Glad to hear. I mostly just self medicate and just push through the pain. Its not the years its the mileage as they say, though...the years are catching up with the mileage.
 
Glad to hear. I mostly just self medicate and just push through the pain. Its not the years its the mileage as they say, though...the years are catching up with the mileage.
I've been living with it for about 40 years. Usually a little rest would get me back on my feet after a relapse. But the time between recovery and the next relapse was getting shorter and shorter, to the point I was spending more time recovering and less time living.

Now the knees are causing problems ... or maybe the back was so bad I didn't notice the knees were also a problem.
 
Now the knees are causing problems ... or maybe the back was so bad I didn't notice the knees were also a problem.
Yea....lol the squeaky wheel get the grease. Some wheels are just louder then others.
 
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