All Questions
Tagged with solar-panel or photovoltaics
65 questions
1
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44
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Photovoltaic system with storage in a shed 50 m from my home. Where to put inverter and batteries?
I want to install a photovoltaic system in a shelter in my garden, because it has a very good south exposition (my house is not south and shaded by high trees) and a reasonable surface (20 m2).
I am ...
- 56
1
vote
1
answer
59
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Do utilities ever disconnect solar panels in cases of low demand?
This question asked something that was predicated on "solar roof installations [being] disconnected from [the] grid" for low demand.
Do utilities ever disconnect solar installations for low ...
- 1,207
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0
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23
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Charging a Battery Energy Storage System (BESS: 600MW/ 1200MWh) with a Higher rated Power Plant (1200MW)
A project mentions requirement of setting up a 1200MW solar power plant with atleast 600MW/1200MWh BESS system. The BESS is to be charged exclusively with solar power. My confusion is what if the ...
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0
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13
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Find an empirical formula that relates the output voltage of a solar panel to irradiation and temperature
I want to determine the output voltage of a solar panel based on irradiation and temperature.
I have a dataset spanning three years of irradiation and temperature in Dubai, recorded every 30 minutes.
...
0
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0
answers
46
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Should a house wall be perpendicular to the direction of a strong wind carrying rain water?
I am building a perfectly squared single-storey house (10m x 10m).
To have the best output from the solar panels, which should face South as straight as possible, the external South facing wall of the ...
0
votes
1
answer
241
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Is exceeding the maximum power an issue for solar panels and inverters?
Say I have a solar panel setup which can produce a total of 16 kW peak. With an inverter that has a maximum PV input of 6kW, would this be an issue that could lead to defects? Or is it just ...
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2
votes
2
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89
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PV solar panel is producing more than is possible according to its datasheet?
I have a client in Belgium that has 16 DM400-M10-54HBB on his roof. On Saturday the 2nd of December 2023, the PV output was 3.95 kW, according to the log of the Huawei SUN2000 4.6KTL-L1 5 kVA inverter....
2
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0
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57
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Are two solars panels more efficient than only one of twice the power output?
Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel?
As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to ...
- 21
1
vote
1
answer
81
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Developing a solar powered traditional river boat [closed]
I am currently in Indonesia with fellow students working on a project to experiment and build an alternative energy source to propel boat with optimal efficiency and also to minimize the use of diesel ...
- 11
1
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2
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173
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Pump capacity calculation
I have a borewell dug in my farm and the depth of the borewell is around 195 feet. I have applied for a Solar pump subsidy and I am about to get the equipment with following details:
4.7kW solar ...
0
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1
answer
82
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Beehive Exhaust Vent 🐝 Solar Panel + CPU fan
Here’s an easy question
(I believe, knowing nothing about this subject.)
SMALL WEATHER-PROOF SOLAR FAN
A 3 in. diameter fan, powered by a solar panel. It will be mounted horizontally, face up, over a ...
0
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3
answers
86
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Does a load on a charging solar system degrade the battery if the panels are producing more current than the load?
Let's say I have 1000 W worth of solar panels hooked to a 2 kWh battery system like the Anker 767. Let's also say that the panels are running at full clip and I have a 900 W load on the system.
Does ...
- 495
0
votes
2
answers
326
views
How can some clouds be removed from the sky?
I order to optimize output from a solar park I need to know how to remove clouds in the sky in an economically feasible way. Output improves tenfold without clouds. How can that be achieved? Weather ...
- 151
11
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6
answers
4k
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Why isn't heatpump technology used for solar collector panels and boiler tanks?
All solar collector and boiler tank systems that I can find on the market use a liquid to circulate the heat between solar collector panels (or PVT panels) and boiler tanks. Is there a reason why they ...
- 265
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0
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17
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Estimating the effective area and temperature coeffecient of a solar panel
I have a bunch of solar panels, each one is connected to an inverter.
For each solar panel I have two sensors, a wind and a west sensor.
From every inverter, I collect the power output.
The readings ...
- 1
0
votes
1
answer
18
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Heat handling in BIPV System
In a BIPV System, how is the heat handled? I mean the cells absorb the solar radiation and along with that the heat. So how is this heat handled? I was reading that the conventional solar system is ...
0
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0
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88
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Is it safe to leave a power bank connected all day to a 10 W solar panel (so with varying voltage and current)?
I have a 10W Solar panel with 5V USB output and a few power banks (the one I'm willing to risk for now is an older Li-ion one rated 3.7V/6000 mAh/22.2 Wh with microUSB-in 5V 1.9A max).
My question is ...
- 1
1
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0
answers
48
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What could be the cause of these spikes in current when measuring it from a solar panel
I was measuring the current through a solar panel at different light intensities and I found that sometimes it caused large spikes in the current and I can't find a reason for this phenomenon. Is this ...
- 11
1
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4
answers
726
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36V solar panel with a 12V battery, results in 12 watts a day?
So I bought a retired 175W solar panel 36.8V rated voltage, 4.9A rated amps. I hooked it up to a solar charge controller and a 12V battery. Normally the controller doesn't work cos the PV voltage is ...
- 111
0
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0
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162
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Can a grid connected PV system deliver power backwards through the distribution transformer?
If there is no local load demand can a residential roof top grid connected PV system deliver power across distribution transformer [up to the higher voltage grid]?
Suppose my grid connected solar pv ...
- 1
0
votes
1
answer
71
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Figuring out power requirements of pool heater elements powered directly by solar panels (panel efficiency & sun,evaporation, insulation, ), etc.)
EDIT 1:
firstly, thank you for the comments and the input
In this calculations the panels are already involved from the start as being the source (due to other connections to other systems when not ...
2
votes
1
answer
372
views
How large would a solar panel array need to be in order to supply all the world's energy?
This story from 2016 claims that all the world's energy needs could be supplied by covering 1% of the Sahara in solar PV panels.
Was (is?) this true, and if not, how would you go about approximating ...
- 121
1
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0
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328
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Charging a 2020 M1 Macbook Pro from a low-voltage solar array
I'm working on a small project to mount solar panels to a Macbook case which would allow it to charge/offset battery consumption.
I noticed that I was able to power the Macbook on public transport ...
- 111
1
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0
answers
59
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Problem with relationship between shunt resistance and grain boundaries in a solar cell [closed]
Here is the correct answer from another stack website.
The higher shunt resistance means that higher the
polycrystalline lattice irregularity and many grain boundaries. This
means higher current ...
0
votes
1
answer
63
views
Safely Measuring Voltage from Solar Panels in an Experimental Research Field
I'm installing solar panels (not connected to the grid) in units out in a field for research we're doing that looks like this (this is an outdated image, but I can't find the updated one unfortunately)...
- 3
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1
answer
69
views
Can waste heat in specific environments be collected into photons and converted to electricity?
This question is a repeat of another post on the physics board
Here and here show the possibility to combine photons of lower energy to higher energy. Thinking of an application, it could be used to ...
- 101
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2
answers
323
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Are cameras' CCDs just elaborate tiny solar cells?
While watching How It's Made episode on CCDs, this just springed to my mind... I always though of CCDs as of some kind of alien technology. Only now I realized that it's just an array of silica ...
0
votes
1
answer
71
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explaining ohmic loss and understanding inverter efficiency curve
I'm trying to understand an efficiency curve from PVsyst, using this documentation
However, I'm not sure what this sentence means:
This production is penalized by an ohmic loss$^1$ of the internal ...
- 105
0
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1
answer
43
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Explanation for photovoltaic circuit
My background is in Environmental Science, although I have recently been taught in the basics for energy engineering especially for solar panels.
I'm currently using PVsyst to build solar panels on a ...
- 105
0
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0
answers
51
views
Shadow flicker validation
I am currently trying to validate a shadow flickering algorithm against some data generated by Openwind. The goal of this validation is to have a code that we know that is correct and modify it to ...
2
votes
1
answer
375
views
How do I properly store lead-acid batteries?
I am working on an off-grid solar project, and I need to store the energy my solar panels produce in batteries. I will use sealed lead acid batteries because they require little maintenance and are ...
- 29
3
votes
0
answers
80
views
Any Idea of This China's "Transparent Concrete"?
I am currently make an attempt to make miniaturized version of this China's solar highway on my garage
https://www.youtube.com/watch?v=zK8FvzI3yDA
Just so i can re-evaluate the performance
However, I ...
3
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1
answer
194
views
Does this PID-like algorithm make any sense for a solar inverter?
The application
I want to implement the control of a photovoltaic inverter. The goal would be to keep the consumption of a microgrid (the power absorbed from the grid) to a constant value.
Notes:
I ...
- 81
0
votes
1
answer
125
views
Joining the negative PV wires of 3 solar arrays for 3 MPPT controllers in an inverter?
My Inverter has 3 MPPT inputs. For some design simplifications (Involving ATS), i would like the three arrays to have separate PV+ but join the PV- wires together at a bus-bar and take the Inverter ...
2
votes
1
answer
843
views
How do multiple enphase microinverters stay synced to the grid?
In a prior question it was established that any string or microinverter that is grid tied must put out sinusodial power. But there is also the task of being in sync with the grid. It seems from ...
- 21
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0
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39
views
How do I physically protect solar panels from snapping when dropped?
I am creating a system that I drop from 20m to the ground and I want it to be solar powered. Weight is an issue so I am trying to minimise it as much as I can. How can I ensure that the solar panels ...
1
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0
answers
76
views
Is it economical to use solar energy to manufacture solar panels?
Estimates of area needed to be covered by solar panels to power all of the US using only solar are about equal to a 100 mile by 100 mile tract of land. But solar panels have a lifespan of only a few ...
- 71
1
vote
1
answer
57
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What's the name of this parameter?
$ P_m=P_n*{G\frac1{G_{STC}}}*[1-\gamma*(T_c-25)]$
This equation is applied on sollar cells. $ P_m$ is the mean power produced in 15 minutes, $P_n$ is the nominal power [W], G is the insolation [W/m2]...
user20096
-1
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4
answers
47
views
What is the definition of Building integrated photovoltaics?
What is the definition of BIPV?
Building integrated photovoltaics emerged as a new way of reducing energy consumption. However, the question is how do these systems work?
2
votes
3
answers
149
views
Transferring energy generated by photovoltaic methods
One of the many challenges facing PV power generation is how to store surplus energy for night time demand. My question is this: since the sun is always shining somewhere on the planet, would it be ...
- 21
0
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1
answer
49
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What is the purpose of the isolated subpanel terminal of a solar inverter?
In a grid-connected (utility-interactive) battery-based PV system, what is the purpose of the 'Isolated Subpanel' terminal of the inverter?
EDIT: Found this descriptive image and hence answered the ...
-1
votes
2
answers
68
views
what classes should I take so that I can perform research into finding catalysts to split water into oxygen and hydrogen? [closed]
I am a freshman student and I am very interested in using solar energy to break water into hydrogen and oxygen. So, I want to know which areas are important in this regard..
- 123
3
votes
2
answers
139
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Rotating Multiple Solar Panels with One Motor
I am designing a system to have solar panels track the sun, but only with one axis of rotation that will tilt the panels from east to west.
I want to connect the panels together so that one motor ...
- 173
-1
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1
answer
80
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Resistor to limit maximum voltage of solar panels
I have two 20W solar panels (each Voc = 22.3, Isc = 1.22) in series connected directly to an axial fan driven by an EC motor (rated voltage 48V). Here the maximum operating voltage when very sunny has ...
- 11
1
vote
2
answers
173
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Solar panel actuator control
I'm looking to design a system that can control a solar panel through an electrical actuator for a range of motion of -45 to +45 degrees for maximum solar exposure. The panel will be mounted on a 10 ...
- 111
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votes
3
answers
127
views
Working mechanism of photovoltic cells
In the textbook : Electric Power Principles, in Chapter 1
on the working of a pv cell :
The source current Is is the result of absorption of photons in
sunlight that cause separation of ...
- 127
2
votes
2
answers
40
views
Simulate Dust Layer on PV Cell?
Is it possible to simulate a layer of dust deposited on top of a PV cell in a controlled manner?
One potential method I had was to put a given weight of a particulate/powder (chalk powder, talcum ...
- 123
0
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1
answer
38
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Is it possible to cook with low power PV systems (under 300 W)
This topic is slightly related to this one, with some extra details.
I would like to go off-grid and therefore buy a PV kit. I can see that the prices for PV systems with a power of +3kW are very ...
- 614
2
votes
1
answer
324
views
Design of Compound Elliptical Concentrator and Compound Parabolic Concentrator
What is the process in design a Compound Elliptical Concentrator and Compound Parabolic Concentrator if I wanted to achieve 100% optimal concentration ? Let's assume random numbers of: A light source ...
- 21
1
vote
2
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6k
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Electrical flowchart in Microsoft Visio : issues
I am trying to recreate in Microsoft Visio a diagram of a photovoltaic power plant that would look like the one below.
But I have some issues for doing so, in particular :
I don't know how to ...
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