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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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How can I switch between battery tracking mode and input voltage regulation mode on the BQ24210?

I'm trying to create a circuit in which a BQ24210 automatically switches between charging a battery via battery tracking mode and charging it via input voltage regulation mode. This is done by having ...
gins123's user avatar
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45 views

Discrepancy in Diode Simulation Results between LTspice and Standard Test Conditions [closed]

I'm currently working on simulating diodes in LTspice and have noticed a discrepancy between the simulation results and standard test conditions (1000 W/m2, 25 degrees Celsius. The results have been ...
Mohamed Haj hamido's user avatar
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Help Needed for Solar Battery Charger Design Using CN3795

I have created a solar battery charger using the CN3795 IC. The goal is for the panel to output 2A at 5V. The panel characteristics are as follows: 50W, Vmp of 17.22V, and Imp of 2.91A. For the ...
Alexander idid's user avatar
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Multiplexing Solar Cells with a Common Positive

I am trying to switch between 6 pixels of a Perovskite Solar cell that exist on a single slide. I hope this would allow me to measure their voltage and current with one four-wire measurement ...
Kerry Tang's user avatar
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2 answers
65 views

Charging a battery using solar panels, and IV curve of the solar panel

I am aware that a solar panel has a fixed IV curve, and the load resistance can move the operating point of the solar panel along the IV curve. If a solar panel was used to directly charge a battery ...
siyunlee's user avatar
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DC LED flickering - connected to Solar Panel (DC) with fan (DC)

I have set up a 100% DC system for my house; solar panel (400 W, 10 A, 40 V) and the circuit connects to two LED fans in series (DC - 12 V) and radiator fan (DC - 24 V). I'm an arts student and self-...
noobie electric's user avatar
1 vote
1 answer
65 views

Can I replace a 12 V 190 Ah battery with two 6 V 200 Ah batteries in 48 V system?

The battery bank is made of 4 each 12 V 190 Ah AGM lead acid batteries. One died, and I couldn't find the replacement easily. Instead, I found some 6 V 200 Ah batteries. Could I hook them up and be OK?...
joo lee's user avatar
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Charging 1.2V batteries with a solar cell

I have a pendulum driven by an electromagnet that I've been powering by two 1.2 volt 2000 ma Ni-mH rechargeable batteries in parallel. I've gotten the pendulum to swing for 3 months on this setup. I ...
Wylie Wisnewski's user avatar
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1 answer
101 views

Am I legally allowed to use solar panels for powering SBC-based sensors in Australia and New Zealand?

I am designing a weather station that will be installed on other people's property in Australia and New Zealand. I was previously prototyping with Raspberry Pi computers, but it may end up being an ...
ZPMMaker's user avatar
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1 answer
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6V 3W solar panel and to charge phone through a DC converter XL6009E1 via a 12V 2A car charger [closed]

I have a 6V 3W solar panel and want to charge phone with it, i have tried a dc converter XL6009E1 via a 12V 2A car charger it shows charging but battery power did not increase I am scared of using the ...
Godfrey DonShawsky's user avatar
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Confusion regarding solar power?

I was reading book of gilbert and i came across the following statement One of the most useful ways to describe energy production from a PV array is in terms of kWh/yr delivered per kW of STC rated ...
DSP_CS's user avatar
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Low Solar Panel Voltage Vmp Operation

so I'm currently working on an MPPT project using Asynchronous Buck Converter with the design : Capacitor Input : 470uF/100V Capacitor Output : 1000uF/100V Inductor : 65uH fsw : 39khz current : 30A ...
tabun's user avatar
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1 vote
2 answers
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Why not always connect cells in series to increase voltage in solar component setups? [closed]

I am designing a solar system which I can take to an Indio village deep into the Amazon forest, and thinking about some principles. I am talking about a 2, 3, or even 6 kW system. I see a big problem ...
Gunther Schadow's user avatar
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Solar panel charging Li-ion battery with PWM + MOSFET

My idea is to set up a circuit that uses a 18 V, 15 W solar panel to charge three 3.7 V 21700 Li-ion batteries in series (nominal voltage = 11.1 V) while the solar panel is connected directly to the ...
Geona's user avatar
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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 ...
khalil_emdev's user avatar
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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.
Francis 's user avatar
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31 views

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
-1 votes
1 answer
61 views

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 ...
DSP_CS's user avatar
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1 vote
3 answers
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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 ...
davegravy's user avatar
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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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1 answer
81 views

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. ...
John's user avatar
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2 answers
125 views

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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2 answers
72 views

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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136 views

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
3 answers
1k views

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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3 votes
3 answers
118 views

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 ...
ATJ's user avatar
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1 vote
1 answer
94 views

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
57 views

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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2 answers
133 views

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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105 views

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 ...
Kokachi's user avatar
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1 vote
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78 views

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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0 answers
22 views

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
0 answers
45 views

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
288 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
  • 13
1 vote
1 answer
90 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
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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
0 votes
2 answers
119 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
0 votes
0 answers
62 views

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
1 answer
128 views

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
0 votes
0 answers
41 views

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
215 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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0 votes
1 answer
219 views

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
409 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
72 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
163 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

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