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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.

3
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1answer
42 views

Creating a temperature-dependent solar cell in LTSpice (using varistors)

I'm currently working on my master thesis and therefore need to simulate a solar cell in LTSpice. I've already modeled and simulated some examples with constant values. But for a more accurate model, ...
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0answers
27 views

Temperature coefficient of GaAs cell

How can i find open circuit voltage/temperature coefficient and short circuit current/temperature coefficient of GaAs cell
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0answers
31 views

Short circuit fault in solar cell [closed]

I induced short circuit fault in PV array by just connecting positive terminal with wire to negative terminal. Current remains same but voltage drop out 0.2 how? It shouldn't drop out 0.6 something ...
0
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1answer
63 views

DIY Use 18650 in place of 18500

I got a (relatively inexpensive) SmartYard LED Solar Spotlight as a gift, and have been playing around with ideas to extend the battery life. It uses a 3"x5" solar panel, and comes with a 3.7V, ...
0
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0answers
44 views

How to calculate the current produced by a solar panel?

The equation for calculating current when given voltage and temperature is known as the 5-Parameter model ie. \$I = I_{ph} - I_o[\exp(\frac{V + R_sI}{nV_t})-1] - (\frac{V+R_sI}{R_{sh}})\$ Since this ...
1
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1answer
41 views

Explanation of 5 Parameter Model for Solar Cells

I am having a hard time understanding this equation, the 5 Parameter model for photovoltaic cells. \$I = I_{ph} - I_o[\exp(\frac{V + R_sI}{nV_t})-1] - (\frac{V+R_sI}{R_{sh}})\$ My goal is to apply a ...
0
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0answers
28 views

How does using PWM generator to control inverter work in Simulink?

I am trying to model a PV system connected to the grid and use PWM generator to synchronize the inverter output with the voltage condition on Grid. I figure I need to use Three phase PWM Generator ...
0
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1answer
63 views

Extract AC current from AC/DC current generated by a solar module [closed]

I have a solar module with capacitance in nF range. There is an AC and DC current coming out from the module due to the incident DC and AC light. I would like to treat this like an AC/DC current ...
1
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2answers
75 views

How has solar panel power density improved recently

Im interested in how watt per kg has advanced over the past 10-20 years for consumer solar panels. Can anyone shed some light on this? A table would be great.
0
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1answer
46 views

Solar Powered Green House

I'm thinking of making a RaspberryPi solar powered smart "green house", with LED lights, water pumps and a few sensors. I would like to point out the "green house" would be about 6ftx2ftx2ft - more of ...
0
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1answer
75 views

DIY Solar lamp circuits with 5252F explained?

I have a bunch of solar panels, rechargeable batteries, 5252F circuits, inductors and LEDs and while reading https://artists.scitoys.com/three_volts that seems to be enough to make my own solar-...
0
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0answers
83 views

Solar Charge Controller with SMPS Power Supply

Hi, I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
0
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1answer
54 views

9V instead of 3.7V 8.14WH

I have a solar charger which has a battery of 3.7V 8.14WH which is rechargeable. The battery was rechargeable but died. The charger wasn't working with the battery inside it, so I removed the battery ...
0
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1answer
34 views

Operating Voltage and Current of solar PV panel connected directly to a battery

Let's assume we have a 60 cell 260W PV panel with the following STC characteristics: Voc= 38.1V Isc=8.98A Vmpp=31.1V Impp=8.37A The panel is exposed to direct sun light and standard conditions are ...
0
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1answer
45 views

12 V 3.8 A water pump to 12 V 625CCA battery

Wanting to use car battery to power pump. Pump says it's 12 V 3.8 A, uses a 8 A fuse. Trying to sort out possible solar input needed to run pump but the numbers don't make sense. What size solar panel ...
0
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1answer
24 views

Designing an effective extensible solar cell + car battery setup [closed]

I've got a cabin that I visit on weekends and because I need to charge my computer and tools there, I decided to bring an old car battery and bought a solar panel to charge it. Right now I use a cheap ...
0
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1answer
37 views

Solar variation tolerance for a solar panel

How to estimate average variation of input solar radiation that would be tolerable for a given solar panel? On what parameters will it depend?
0
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0answers
20 views

Bypassing solar charge controller using trickle charge voltage?

In an effort to simplify a small solar system and to keep the cost down, I am wondering what (if any) drawbacks there are to having the Vmp (voltage at maximum power) in a solar panel setup, at 12.5% ...
0
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2answers
187 views

How can I use an LED driver (QX5252) to light up 3 different color LEDs (Green, Yellow, Purple)?

I am trying to light up 6 LEDs with the common garden light circuit (2v Solar panel and 1.2V battery). The problem is that I want to light up 2 yellow LEDs, 2 green LEDs, and 2 purple LEDs ...
0
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1answer
59 views

What is this solar power RC circuit doing?

I am a CSE student working on a project. We are using a solar powered microcontroller. The solar panel's power goes through a fuse and an RC circuit with a varistor to the charging system. What ...
0
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2answers
46 views

How do 24v or 48v solar/battery inverters provide power for houses that rely on 110v?

I've been learning about solar systems and I keep seeing that the systems feed power in to batteries, which is then fed in to the house via an inverter, typically 24v or 48v. However, most houshold ...
0
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1answer
103 views

DC converters for solar cell

As we know, the voltage level of a solar cell is lower than what a rechargable battery needs, and thus a DC converter is placed in between.( With feedback control for optimum V-I curve) This just ...
0
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1answer
32 views

How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse?

simulate this circuit – Schematic created using CircuitLab How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse ? if no load => solar cells ...
0
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1answer
46 views

Connecting a Solar Panel and Power Supply in parallel, in order to power up a load

I am using a Solar Module to charge a LiPo battery. The current supplied by the solar module goes into a battery charger IC and from there to the battery. This works fine. Now I want to add an ...
1
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1answer
48 views

Necessary voltage to charge NiMH using Solar Panel

I'm trying to understand which voltage I need to charge my NiMH batteries so I can purchase the components to do this. Actually I have 2x AA Ni-MH 1.2 V 1900 mAh and 4x Solar Panel 2 V ...
0
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2answers
41 views

Powering 3 identical laptops using a solar panel

I have 3 identical laptops rated at 45W and 20V. The combined wattage of all 3 is 135W. I want to charge these laptops via a solar cell. Do I go for a solar cell rated 135W 20V or one rated 45W 20V?
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1answer
36 views

Battery sizing for motor?

I have a question regarding battery sizing and solar panel sizing ,I am not from an engineering background that's why i might need some help with this. I want to run a 24vdc gear motor 180W 11.5 amps ...
1
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1answer
161 views

How to charge 4 NiMh AA batteries with solar cell

I have a nice 6V solar panel and I was thinking to use it to recharge a 4xAA NiMh battery pack (nominal voltage 4.8). Is it enough to put a series diode (0.7v) to drop the voltage, or do I have to ...
1
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2answers
76 views

Mini solar panel not working

I have a very basic though unsolvable issue so far, I bought a (shitty) mini solar panel, outputting up to 6V and 1W (166mA), and I cant get it to work with the equipment I have or even measure any ...
0
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2answers
43 views

Solar panel with broken glass produces designated Voc but far less Isc Amperage

I have quite several 72 cells solar panels with cracked glass taking punch during the handling. The designated Voc is a little over 45V and almost all of the cracked solar panels (20pcs) generates Voc ...
1
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3answers
185 views

Best battery to power a Microcontroller outdoors [closed]

I live in a place where the temperatures can range from -20°C to +40°C in different seasons. I need to power a small micro-controller that uses very low energy with a solar panel and a battery. Which ...
0
votes
1answer
40 views

Solar cell failure

I am a student in high school, and I am working on a project. I got a Solarbotics Marble Machine, and I could not get the solar cell to transfer power to the motor. I talked to my Robotics teacher and ...
0
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1answer
54 views

Li-Ion Battery Solar powered circuit

I am currently working on a Solar powered project but I am having a hard time making it work: I have a PCB with an Arduino and a sensor, this circuit consumes 250mA for around 2 seconds every 10 ...
-2
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2answers
436 views

How to charge lithium ion battery in series and parallel?

I want to use TP4056 in my solar power bank project to charge a lithium-ion battery (3.7 V, 2000mAh each one), but I don't know how to use it when I want to charge more than one battery. Is those ...
3
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0answers
73 views

New DIY project try to understand MPPT [closed]

I got used battery MODULE with the next specs "40V 18.4AH 736WH build of ninety six A123-26650 LITHIUM LIFEPO4 cell " Cell specs: Nominal Capacity: 2300mAh Voltage(nominal,V): 3.3V Internal ...
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1answer
139 views

What motor do i use to rotate a tumbler at low RPM and high torque which run by a battery charged by solar?

I am gonna run the motor to turn a tumbler of 50-85 kg @ 5 rpm MAX. The motor will be powered by a battery which will be charged by solar. So should i go for a DC or AC motor? Single phase or 3 ...
1
vote
1answer
65 views

what size battery storage is needed to provide 10A at 115v for 5 continuous hours

I have a two part question: What size battery storage is needed to provide 10A at 115v (I meant 115v AC) for 5 continuous hours? what size solar array (assuming proper alignment, etc.) would be ...
2
votes
4answers
442 views

How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
2
votes
1answer
104 views

Apply voltage to a solar cell

I was thinking about a power circuit in which the power can be supplied on the same rail through a solar panel or an ac adapter. I automatically thought to add diodes in series to form an OR gate, so ...
0
votes
1answer
94 views

3.5v solar panel Li-Ion battery charger

I am planning on recycling some cheap low voltage solar panels that came out of a gardening light. I have two of these modules, that soldered in series provide a voltage of around 3.5v (on direct ...
0
votes
2answers
109 views

Solar powered LED via capacitor?

I am building a large garden peice in wood, which I hope to illumine from within, powered by a small, (perhaps 90x65, 6v, 0.6w 100mA as space is limited) solar panel. After testing, I noticed that ...
0
votes
1answer
69 views

Dual axis solar tracker with singlr LDR

I'm working on dual axis solar tracker project, but the task I was given was to make a solar tracker work with a single LDR (Light Dependent Resistor). The LDR would be placed in a pipe which is ...
0
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1answer
95 views

How does voltage output of a solar cell increase/decrease?

I am confused on how voltage and current work in a solar cell. I know that current is affected by the amount of sunlight the cell receives from the sun, and the voltage of the cell is based on the ...
0
votes
1answer
106 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
0
votes
1answer
59 views

Wrong output on solar inverter

I have started working on proteus two days ago for my college project and I’m having some problem in the solar inverter. Diagram which I refered for making this inverter: And I tried to recreate ...
2
votes
1answer
103 views

solar panels: multiple roof surfaces on one inverter string?

Notice below part of electric scheme as designed by solar company: On the left you can see inverter used - Delta Solivia 7.6 TL (see Operation and Installation Manual for details) which supports up ...
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0answers
13 views

Connection of Solar Array in Series in Matlab Simulink environment

I need to simulate a solar photovoltaic feed induction motor system. I need to connect 12 solar array/module connected in series to increase open circuit voltage. I have modeled a solar array of 36 ...
2
votes
1answer
315 views

How to efficiently charge 48V battery-motor system with solar panels

I'm wondering how to efficiently charge and use the following system with standard 18V solar panels: 48V lead-acid battery 1kW electric motor To charge the battery with either PWM or MPPT, the solar ...
0
votes
1answer
28 views

How to do high switched current from small solar

I am working on a small, solar-powered application that makes use of RF and a few higher-power sensors. Those will only be on for a fraction of the time, but might consume 1A-2A at 3.3V. The ...
0
votes
3answers
75 views

Will lower voltage power source supplement/charge higher voltage power source?

I would like to add a 4.5V 1.5W solar panel to supplement an existing electrical setup in my vehicle. My current setup is an Arduino and other electronics wired up to an "add a fuse" in the car fuse ...