Why Solar Panels Don't Output Rated Power
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- Опубліковано 8 лип 2024
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When planning out your DIY Solar setup there are many factors you need to consider prior to ordering even your first part of the overall system. Just looking at the rated power and getting the corresponding number of panels to fit your need is not enough. I will walk you through some rules of thumb and also the 5 factors that can reduce the power output from your solar panels.
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Those Thunderbolt panels are built different. I have a couple and they will consistently output 100+ watts sustained even after the panels heat up. My best one puts out 109 watts as long as the sun is high and there aren’t any clouds. Those panels are pretty amazing
as long... as the sun is high and no clouds... hmmm
I agree, I think they were a bit conservative on the 100W rating for this panel. This is definitely not always the case. I am not sure how controlled each brand is when using STA to validate their panel output. Seems to be a bit of variability across the different brands. Thanks for the feedback!
@@mos8541 that’s the same with all solar panels though. All other 100 watt panels I’ve used in the past output 80ish watts at best.
They aren’t best price per watt out there by any stretch (used panels win every time) but they have a relatively high bang for buck ratio if you catch them on sale.
Because the shine 9999999999 wattage light at then while touching....
.
Excellent discussion. Although you can take into account all of output factors yourself, but experienced pros know their products and the local conditions (like snow cover, afternoon clouds etc.) When I installed my PV arrays (one in 2005 and the other 2008) the installers predicted their annual output, and that turned out to be close to the measured output. It was worth it to me to pay for that experiance.
Yeah, when sizing for the home it is nice to have a consultant with experience in solar and your area 👍👍
Years ago I picked up a dozen panels that had been part of a research project at Georgia Tech. Installed on the frame that supported the panels was an array of misting heads, and a controller that would turn on the mister when the panels were above a certain temperature. I don't have any knowledge of how effective it was or wasn't, but I found it interesting. We used the panels to charge the batteries for several off-grid amateur radio repeaters, and cooling arrangement would have been too complicated (plus no water on site anyway).
Sounds like an interesting project 👍
As I watched this video, I started wondering if some sort of water cooling would be helpful.
Glad to hear I think like an Engineering student at Georgia Tech! Thanks for sharing. 🙂
oh Scott... u in dreary overcast no sun for days IL, yes i lived there , i often ask peeps i know who put up arrays... how often... or IF they EVER reach claimed output, course i know they dont... cuz there's AZ... and then everywhere else... 😜
😁 I am sure sooner or later I will be putting IL in my rearview mirror 👍
I just did a video with 6 Harbor Freight 100W Panels peaked at 702W (117W avg per panel).
Not a fan of that cost estimator. If i wanted to have a phone call with an installer i would call one up myself.
also, If you get ali express Chinese panels you need to subtract about 33% from the stated power from the manufacturer.
😁 the “Ali Efficiency Coefficient”
Atomic power is the only answer. Natural gas as a backup when needed for (unexpected)SHORT TERM peak loads.
comment please.
Not true
@tazdevl2000 when they build modern nuclear plants, there are safety measures put into place to ensure that there can never be a runaway chain reaction. Also whenever new nuclear power plants are built they construct a Vault on site to seal away all the nuclear waste. It is one of the most reliable forms of zero emission energy production
I hope you're doing a full video of your shed install/set-up.
Should be multiple videos, a few on Everyday Home Repairs (Shed build) and then on Everyday Solar off-grid solar setup.
I have two 100w panels in parallel. I covered one and checked the output on my controller, I did the same with the other panel. If I’m getting roughly 63w on one panel and 57w on the other panel why when I have them both uncovered I’m reading roughly 65w combined?
Nice one... Very well explained...
However, some solar charge controllers can limit the expected power generation
I'm curious how well the panels and electronics actually weather the weather. Can these systems really run years uninterrupted or am I going to be climbing on a roof every six months or so troubleshooting connections?
Are you explain more about the Cells temperature will lower the output wattage in a video
At 100 watts per panel, that would take ten panels to make 1000 watts (ideally). To make 11kw, you'd need eleven times that -- 110 total panels at 100 watts per panel.
For sure, the panels going on the roof of my house will be roughly 400W per panel. This size is ideal for sheds, trailers, campers, and other off-grid DIY projects 👍
nicely explained
Hey Scott, do you have any thoughts on panels vs shingled solar?
I LOVE the idea of shingled solar but we are still so early on the technology. I am also a big fan of Tesla so I want to see them continue to grow their Tesla Solar roof but from what I have seen those are limited to certain areas. It is my best guess that from residential home solar that is the future just not sure when we will start scaling up and have multiple players to choose from.
Marques Brownlee just put out a UA-cam video about his Tesla solar roof after 1 year. It was interesting.
ua-cam.com/video/UJeSWbR6W04/v-deo.html
Let’s hope the superconductor turns out to be real so those wire losses go to zero in a few years!
No one ever tells the full truth about solar. You're getting peak power at noon, if there's no clouds, shaded panels, cool cells, not covered in dirt, etc. You say 80%. More like 20-35% of rated power. Worse if you sign up for these net-metering programs that are actively being nerfed across the country (less compensation for the power your system throws back on the grid), you're not going to get a big enough discount on your bill to make it worth going through the hassle. All the expense to you, all the benefits to the power company. Rooftop solar is such an unwise move. 1000's of companies have gone bankrupt selling this scam that is destabilizing grids by taking the reliable generating sources offline.
Unlimited free RFI with this setup as well. Starting at 0:30 and throughout video. Good information though.
Lol, the more sun there is, the lower the output on solar panels. Got it. The logic checks out.
I got the 400w eco with the delta max 2000 but I’m only
Getting max 290w
With respect you're read something but haven't understood it.
STC is a standard rating tool, a bit like how they did batteries in the 80's.
But here is the thing, you said best and that's not true, the planet surface can reach 1700 kwm2, 1000kwm2 is averaged.
Now the STC rating is what is standard but so is NOCT (normal operation condition test) and you should be buying based on NOCT. Not STC.
Always on the panel data sheet.
South is best, wrong. Well not wrong but not best. The saying of South is best comes from ' the compromise '
As the sun arch narrows in winter... To give some idea, the summer sun starts east at 4am and sets at 8pm.
In winter the sun rises around 10, and sets at 4.
This arch makes a 'sun hours' change.
However .... Putting eggs in one basket by south facing can lower the yeild or cause over peak power.
So the direction of the panels (16o an hour) shifts the peak output.
If you had 1000w loads and 3kw of solar, you wouldn't want 600w in the morning and then 3kw between 11:00 and 14:00 and then 600w.
You would want to spread that. As you maybe can't use the peak power in such a short time.
Angle, now that can make up to 75% difference... Normally 50%. But the angle the sun hits the panels is very important as is the yield required. Typically winter the sun's arc is around 400wm2, most panels will make use of that at 20%....
You'll lose winter for summer but you'll lose a bit of summer (80wm2)
If you're summer angled then you will lose 80% on top of that, and with money power use being in winter, it's best to angle for winter, because the sun's at triple negative... Angle and kwm2 as well as time .
If you do the summer loses are there but lower as the power (kwm2) is much greater. P
It's not ideal for the best average over the year but the best power you need and can get.
How that helps, I did a year of testing to see the actual differences in the real world and why the status quo was as it was..
I think your Mic is getting interfered with by your phone or smart watch or something. Just happens occasionally.
I think it might actually be from the panels/EcoFlow. Just did another video and noticed it a bit. Thanks for the feedback!
It costs less to wire into the grid, and it's far more effecient if you need consistent power.
Wrong
Interconnection insurance runs 1.5k a year
Unfortunately the ec requires an electrician to install everything. I started with a 6.5kw grid tie and it was great for a few months until they found out I was feeding into the grid so I had to buy a different inverter with batteries and the cost was ridiculous! With this supper hot summer, four 100ah batteries barely run two window air conditioners all day so I had to disconnect my well from my solar till it starts cooling down again 🥵
@@420......... Best top check your total price, including degradation over time of your batteries and cells. Track 20 year old systems, you will find they have been replaced two to three times or effeciency drops are so great that they are not worth it. Compare to the cost of power. You will find that solar is for the wealthy.
@@Laurel-Crowned One of the many reasons photovoltaics is a boondoggle.
Panel A: "Guys, the man is saying we are delivering 300 watts!"
Panel B: "Really?"
Panel C: "Are we supposed to do this?"
Panel B: "I don't know"
Panel A: "I thought 100 W was just a number on the sticker... You know, so they buy us..."
Panel C: "Maybe we were made overrated like 110 W?"
Panel A: "Yoo-hoo! That's one lucky man!"
Still such a PITA.
200th. Thumb up
daily 300w
I think I'll hold out for the home nuclear reactor - it should work on cloudy days AND no Chinese slaves are required to assemble it