Questions tagged [solar-cell]

Solid state electrical device that converts the energy of light directly into electricity by the photovoltaic effect.

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Animal repellent circuit for cows and goats

I want to create an animal repellent circuit for my school project but I'm having some problems designing the circuit. The circuit does not produce any sound frequency. NB: We are not allowed to use ...
Tlotlo Trevig Čhëđ's user avatar
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PWM solar charger Audible noise

I am trying to develop a solar PWM charger controller for LEAD ACID battery based on NMOS high-side switching as you can see in the picture below. NMOS Driver the controller works fine most of the ...
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IV curves of solar cells in parallel and series

When 2 solar cells are in parallel, is it that the final IV curve is the simple addition of Currents (for same voltage) of both individual IV curves ? My main doubt is what happens in 2nd and 4th ...
Nikhil Kumar's user avatar
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What is the sign of a damaged solar cell? [duplicate]

My panel's open-circuit voltage is 19 V, but when I connect it to the load the voltage lowers to 9 V in full sunlight.
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Small solar panel chip to charge a LiPo

I've found this small solar panel: https://www.digikey.co.uk/en/products/detail/anysolar-ltd/KXOB25-02X8F-TB/9990458 I see that output can go up to 4.5v and 5mA . That's sounds huge for me BUT because ...
Singed's user avatar
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What is voltage in I-V curve of a solar cell?

I-V curve of a solar cell is given for a given irradiance and temperature. Given a constant irradiance and temperature, why is the voltage changing in an I-V curve? Is the voltage something that we ...
Nikhil Kumar's user avatar
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Confusion regarding solar cell?

This below passage is taken from chap 9 of book Renewable and Efficient Electric Power Systems I have almost understood this whole passage and its key take away concept (LCB) except the line I bold ...
Engr's user avatar
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Solar charging in northern urban environment - boost mode needed?

I have a metrology device I need to sustain off 12V LiFePO4 batteries in a northern climate (near latitude 43.65) and urban environment. Solar panels will be 50W 24Voc (~18V maximum power point) with ...
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Is this solar circuit connection OK?

My inverter requires a 96v battery input and my MPPT solar charge controllers have a maximum battery voltage of 48v, so I connected them together like this: Is this a bad connection? If yes, what is ...
GuruKay's user avatar
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Parallel solar charge controllers

I need to charge a 12V LiFePO4 battery and to get full benefit from my 50W solar panel I need a bit over 4A charge current capabilities. I've looked through MPPT charge controller ICs and there's the ...
davegravy's user avatar
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Solid state relay in parallel with mechanical relay

I'm wanting to switch my hot water cylinder element based on the amount of solar i'm generating. The element is 3kw @ 230v = 13A. I need to switch the element ON for a short time every 15 minutes. ...
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Connecting solar cells directly to battery

I'm building a solar powered RC plane and need to design a power system to deliver power from the solar panels to the battery and motor. I have an array of 38 C60 solar cells outputting 22.8V (0.6*38),...
Dorphen's user avatar
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How to implement an automatic and continuous variable load across a solar cell to obtain its I-V characteristics?

The project I am working on is an experimental setup to automatically characterize a solar cell. To obtain the I-V curve, the load across the cell is to be varied automatically from open circuit to ...
Wanderer's user avatar
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1 Solar panel to 2 mppt, to 2 separated batteries

In my motorhome I have 1 solar panel (500w) to a one victrom mppt 30A, to one battery 100A of lifePo4. Now I need more battery because i have a new 12v fridge, so I bought other battery 230A lifepo4, ...
Neme Hdg's user avatar
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Test circuit for a solar panel used to power a supercapacitor

I was hoping to power a device with a supercapacitor that would provide power when there isn't light available, so essentially I just need the solar cell to charge the supercap as fast as it would ...
zenizenitsu's user avatar
9 votes
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How does this garden solar light work?

I do not understand how this circuit powers on the load (the LED light). When the solar panel is inactive, i.e. it is dark, there will be a small current from emitter to base, and that will allow the ...
rosewater's user avatar
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Confusion regarding solar cells

I am very confused by these two videos. This video mentions at 1 minute onwards that a solar cell has a PN junction. This video mentions N type solar panels and P type solar panels. From that what I ...
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How to improve my son's solar bobble head [closed]

My son has a minecraft solar bobble head (in this case a bobble Steve). Under light it swings a diamond sword this exact one (Puckator Officially Licensed Minecraft Steve Solar Pal https://amzn.eu/d/...
Jordan's user avatar
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2 votes
1 answer
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Charging li-ion 72V with solar MPPT controller [closed]

I have an EV 72V li-ion battery with given charger (peaks at 11 A). My MPPT solar charger is designed among other types for li-ion up to 96V ie 12/24/36/48/60/72/84/96V settable at 72 V. 50 A max. ...
x y's user avatar
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Combining/ Balancing multiple small solar panels

I am designing an energy harvesting system that runs off of a couple of solar cells. Each cell is a Dye-sensitised solar cell and gives out around 0.5v. Because of the placement of the cells around ...
raider0ne's user avatar
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Will Undervoltage Damage A Brushless Fan?

I have an off-grid solar panel set up ready and it works really well. My solar PWM charge controller of the back side aluminum heat sink is too hot to touch when its during sunlight. I was thinking ...
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I want to switch solar panels between a micro inverter and a backup system. How can I do that?

Solar Inverters are switched off during a blackout and make that you have DC electricity on your roof while being without AC in your home. This may not be as urgent where you live, but in countries ...
wogoos's user avatar
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Long distance cable to monoblock centrifugal pump from PV VFD [duplicate]

I want to install a three phase 10 HP monoblock centrifugal pump that is around 200 meters away from the PV solar Vfd. The solar system is installed with 16 solar panels of jinko 555 p type. I would ...
Mir Ali's user avatar
1 vote
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Flexible solar cell powered LED

I want to make flexible solar cell-powered LED. The flexible solar cell that I want to use is ONP1.2-12X24 and I just want to use chip LED. When I connect only one ONP1.2-12X24, it shows near 1.2V. ...
Beginner's user avatar
1 vote
2 answers
180 views

How long would it take a 400 W solar panel to charge a 28 kWh EV battery?

I'm located in The Gambia which is almost on the equator. We get over 11 hours of sunlight on Dec. 21st. Being a tiny country, daily travel is minimal, at most, maybe 28 km. If I place a 400 watt ...
sarrfox's user avatar
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1 vote
1 answer
88 views

Understanding max output voltage of a solar cell data sheet

For the following solar cell datasheet values, what would be the max output voltage of the solar cell? Would it be the open circuit voltage typical or the max operating one? What exactly is the open ...
starboy's user avatar
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1 answer
73 views

Understanding the circuit 15 Ampere Solar Charge Controller without Microcontroller [closed]

I have a mini project I'm supposed to be doing for university. I've decided to build a charge controller. We aren't allowed to use micro-controllers, so I'm grateful I could find exactly what I need. ...
Olalekan Adekanmbi's user avatar
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2 answers
103 views

Charging LiPo Battery with Solar Panel and Water Turbine Generator

I'm looking for a way to be able to connect a Solar Panel (5.5 V / 540 mA) and a Water turbine generator (3.3 V / 120 mA) together to charge a LiPo Battery of 4,000 mAh. While using the solar panel ...
Christopher Khawand's user avatar
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Troubles with a 20 V solar panel and a DC-DC converter [duplicate]

This is part 2 of my previous post. (Trouble with making a DC-DC converter) Since my previous post, I have finished making my DC-DC converter (switched my power supply and added two 5 W 2 Ω cement ...
kauselis3000's user avatar
1 vote
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Solar excess power dump

I have a 24 V 5000 W 120 A Victron multiplus inverter charger to a Autotransformer 120/240 100A to make split phase on my daughter's off-grid house. 600 Ah lithium batteries (4x 12V @300 Ah), 5000 W ...
Mtn motion's user avatar
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Testing solar panels by covering one up out of 18 panels. If the voltage drops, is the panel defective?

The panels produce 31.4 V under load 45V open circuit, 4.1 amperes under load. I used to have a load voltage of around 271V for 18 panels in two strings of 9 in parallel. The voltage is now about ...
selwyn brindley's user avatar
1 vote
2 answers
203 views

Solar Powered Bilge Pump for Pool Heater

I am planning to build a swimming pool heater, using a solar panel to drive a bilge pump which circulates pool water through 1/2" x (2 x 60) m poly irrigation tube to heat swimming pool. Solar ...
Leon's user avatar
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Replacing solar panel of landscape lights with higher wattage panel

I have RGB solar spot lights in my yard that come in a set of 3 parts each, which connect together to form the system. Solar Panel rated at 6 V / 4 W output. Battery Charge Controller, this one has a ...
Nero F Rox's user avatar
2 votes
1 answer
196 views

Running a TV Using Only Solar Panel, Without a Battery

Objective I would like to power single 49 inch TV (LG 49LF6300) using only solar panel without a battery. I am aware that this will only keep the TV running for a few hours each day but this is not an ...
Chris Aung's user avatar
1 vote
1 answer
71 views

Working of a Solar Cell

In a solar cell the N-type is made thin so that the light can pass through it and reach the depletion region of the junction. How and why is the light able to pass the N-type region and why doesn't it ...
Riddhi Ranjan Sen's user avatar
2 votes
1 answer
129 views

Is it possible to estimate solar panel power based on nominal voltage and short-circuit current?

I know that to measure the actual power of the solar panel I need to measure the voltage & current at maximum power (Imp), i.e. connected to the load. However I can't connect the panel to any load ...
floppydisk's user avatar
2 votes
1 answer
137 views

Missing current value for "B1" (LTspice)

I've been trying to make an LTspice solar panel model based on this video: https://youtu.be/ox0UtYe4owI (2:45). This is the circuit that I got: When I try to run a simulation I get an error: "...
kauselis3000's user avatar
2 votes
2 answers
116 views

Turning off a solar panel with a GPIO

This is one of those problems that seemed super simple at first but, after simulating, appears to be tricker than I expected, at least for my wannabe-EE brain. The circuit I'm working with looks ...
Robert Quattlebaum's user avatar
1 vote
0 answers
108 views

Lithium Ion Solar Battery Charger with current measurement

I have designed battery operated device. The current consumption is around 4ma. The battery which I use , is shown in following fig. the following schematic I have used to cutoff solar panel when ...
inventionClass's user avatar
2 votes
2 answers
346 views

How to check if a solar panel has a built-in blocking diode?

Is it as simple as connecting a voltage to a fully shaded solar panel and checking if any current flows into it? For example using a battery with a resistor in series to limit the current. Or does the ...
Björn Morén's user avatar
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21 views

How can I convert 1v-1.3v at 5a-6a from two solar cells in series and supply 5v out?

Each cell is supplying 0.5v-0.65v and about 5A and I intend on using two of them in series for 1v-1.3v and need 5v out. What ic(s) would be the best fit for this application?
Zachery's user avatar
1 vote
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90 views

How to prevent a nichrome wire from melting under variable energy?

I’m experimenting with a DIY “sand battery”. The “battery” is a pot lined inside with an insulator and filled with sand. The sand is heated by a nichrome wire placed at the bottom. The wire is ...
Sophivorus's user avatar
2 votes
1 answer
173 views

What is the relationship between a solar panel's open-circuit voltage and panel irradiance?

Is there a relationship between a cell's insolation intensity and open-circuit voltage? In other words, assuming all other factors are equal, if I test a panel in full daylight on the earth, and then ...
Kenn Sebesta's user avatar
1 vote
0 answers
17 views

How to wire 2 different sets of panels to the same battery bank

My question is how do I add 2 different sets of panels to the same battery bank? I'm currently trying to design a solar array that will fit my tiny RV. Ive worked out how to fit 790w on my lil rig ...
JT Tucker's user avatar
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0 answers
33 views

Build PWM controlled load for solar panel

for my project, I need to build a variable load to measure the I-V characteristic of solar panel that I can control with a PWM signal from ESP32 (3v3). I'm a software developer, so I do not completely ...
Ondrej Krejci's user avatar
1 vote
1 answer
51 views

Using 2-cell lead-acid battery as direct replacement for single-cell lithium-ion battery

I've designed a system that remotely logs some data (position, some weather data, etc.) in remote areas that currently uses a single lithium-ion battery (~850mAh) that is recharged via a solar panel ...
Microcontroller Enjoyer's user avatar
0 votes
1 answer
48 views

Convert Solar Panel DC to 12v and below with no current cutoff

I have a solar panel that is rated below (old stored away unused panel) Maximum Power (Pmax) 200Wp Maximum Power Voltage (Vmp) 19.3V Maximum Power Current (Imp) 10.0A Open Circuit Voltage (Voc) 23....
CKey's user avatar
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1 answer
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Determine capacity of batteries for solar installation

I have four 420 Ah 6 volt batteries wired in series and then parallel. What is the capacity of the combined four?
user347468's user avatar
4 votes
3 answers
565 views

How is the "Amperage Rating" on Photovoltaic Panels derived?

Please be clear and thorough, I only have a basic understanding of electrical engineering but I try my best to truly understand concepts. I've really scoured the Google on this one. How can a solar ...
Tyler M's user avatar
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Solar panel help

I already have a solar charge controller connected to my solar panels protecting the attached batteries from overcharging. However I'd like to charge a second battery bank without connecting it up to ...
Mike's user avatar
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