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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65 views

Advice for a Solar Charger and Battery Project

I am a high school robotics teacher (no formal engineering training) and I am taking a group of students to Kenya this summer to work with high school students there. The organization we are ...
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114 views

DIY UPS for Home Automation/Energy Management system

OK, the original post asked too many questions and I was asked to rewrite the post question. So after reviewing the old post and rethinking the project here it is. So, as requested, I will ask 1 ...
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1answer
63 views

Effect of Rapid Switching between Charge/Discharge of Lithium Batteries

I have made a DIY offgrid solar generator that utilizes an arduino to determine when to dump excess energy to a water heating load. I have programmed the arduino to activate the load circuit when the ...
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1answer
48 views

Solar panel and power bank

I would like to charge a 20,000mAh power bank with a 18V 20W solar panel. The power bank has 8*18650 batteries in parallel. I came out with 3 options. The first one is to use a buck DC-DC converter ...
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2answers
83 views

Trickle charging 10NiMh in series with ~1W solar panel

I have been put onto a project that needs to be powered by a small (1-2W) solar panel trickle charging a battery pack. The product will be located on rooftops. We have reviewed similar products and ...
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0answers
412 views

Solar charging a lipo battery with ESP8266 as a battery load

I am trying to add solar harvesting capability to my IoT device based on esp8266. I am using linear charge controller (MCP 73831) with solar input to charge a 500maH lipo battery. An observation when ...
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1answer
182 views

Problems when powering a circuit directly from Solar Panel

Am working on a project which uses Solar panel to power the project. I have a 12v 5w Solar panel to use for this purpose. And am thinking to remove the battery from this project since I feel that ...
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1answer
994 views

Power produced and internal resistance of solar cell vs distance from light source

Solar cell can be modeled (rudimentally) as a DC voltage generator \$Vp\$ with internal resistance \$Rp\$. Consider a solar cell at a distance \$d\$ from a (constant) light source. What kind of ...
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126 views

Using an automotive stereo capacitor for other uses

I am looking into using a capacitor to buffer voltage drops for a 12V solar power system. Since it seems I need a pretty big Farad number to give at least half a second of buffer time for my load, I ...
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0answers
457 views

Equivalent circuit for solar cell

I have a question regarding the equivalent circuit for a solar cell. The circuit includes a diode to model the p-n junction of the cell. When some part of the photo-generated current flows through ...
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0answers
5k views

LTSpice Solar / photovoltaic simulation

I've been trying to simulate a solar cell with LTSpice to generate an I-V curve. The model I've been using is the simplified equivalent circuit model with a current source in parallel with a diode. ...
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1answer
54 views

Electrical calculation

I'm need to calculate the how long it will take to charge a battery using a solar cell. I am not taking any charge curves into account, I just want to get a close answer before I run the experiment. I ...
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2answers
40 views

Recharging a 11volt rechargeable battery using multiple 5volt solar panels (Size: 53*30*3mm)

I want to make a circuit using solar panels. I want to recharge e 11Volt 1200mAh rechargeable battery with my solar circuit. The solar panel I will be using is 5volt, 30mAh. So my question is, how ...
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1answer
51 views

By pass diode in PV cells

hope you all are well The bypass diode is usually connected in parallel with PV cell to avoid hot spot and prevent more PV output power losses. The bypass diode is connected in opposite direction to ...
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1answer
31 views

The best way to test a solar panel generation

Is there any way to test how much a solar panel on a given position can generate for let say a day or few days. Like a multimeter that can automatically test the wattage days example? Or create a ...
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1answer
76 views

Does the load at where Pmp of a solar panel is oberved change with temperature?

After reading up on solar panels, I know that the max power that a Solar panel can supply (\$P_{mp}\$) will drop as the temperature increases. The \$V_{oc}\$ will decrease a lot more than \$I_{sc}\$ ...
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28 views

Solar Cell Formula - I/V from Load Resistance

Background: I have the following simplified formula in a VisualBasic program that gives me current output (Icell) from variable input Volts (cellVoc) for a simple PV cell simulation. By varying ...
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0answers
35 views

Protecting Copper Anode in 12V DC System

Getting to grips with cathodic protection here. If someone had a 12, 24 or 48VDC system, say solar PV and batteries, and the battery negative is earthed, this means the earth is the cathode, and the ...
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3answers
157 views

Off grid LED solar lighting without batteries

I have 2 COB LEDs (12-14V DC, 50W, I think with 3,75 A in data sheet). I need to run them with a solar panel, it should only run when there is sunlight no batteries needed. Using a 270W panel (open ...
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2answers
230 views

Low-power solar cell source using capacitors

I am designing a circuit using AtTiny10 to supply a downstream microcontroller with power using only capacitors and a small solar cell. Would the following design work ? The basic idea is that the ...
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0answers
608 views

LiFePO4 solar charging problems (amateur question)

My application is primarily portable ham radio operation. I chose a self-balancing, 4.5 Ah, 12.8V, 4s3p LiFePO4 battery pack, a 28W panel and an MPPT solar charge controller with extremely limited ...
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0answers
207 views

solar panel model as constant current source + initial values

I have created a simple solar panel model in Matlab, using the diode equivalent model. The basic equation is as follows: ...
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0answers
119 views

Full time vacuum pump/powered by solar array and battery

I am putting together a vapor extraction system consisting of a small 12 volt (500 mA to 1 A) 6-10 Watt, rotary vane vacuum pump, powered by a solar array with controllers and battery. My goal would ...
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273 views

LM2596: input voltage varies with output voltage?

I have a 12V solar panel connected to a LM2596 (the one that has one pot for changing output voltage) that gives me a nice 5V output. However, when I check the voltage at the input pins, the voltage ...
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1answer
2k views

MPPT (LT3652) + Solar Panel Voltage

We are trying to charge a 3.7V LiPo 150mAh battery with a 30W 12V Solar Panel. The circuit we're using is a simple derivative the of the MPPT Solar Charger for Sparkfun's Sunny Buddy: Our circuit is ...
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1answer
72 views

Correctly wiring batteries for solar charging

Can I charge a standard crank 12v car battery in parallel with two 6v 225ah batteries that have been wired in series using a solar charger.
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4k views

Li-Po Battery Balance Charging Circuit

I work on a solar tracking project and in this project I have to charge my Li-Po battery to store power and use this power for supplying the system. For this problem, I searched for the li-po battery ...
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262 views

How to synchronize current from an AC and DC current

I'm trying to make a battery less solar grid in which energy from the solar panel will be directly given to home appliances and will be complemented by current from the grid. I'm thinking of passing ...
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0answers
74 views

Solar Cell Performance With Varying Incident Angle

I am trying to calculate the power generated from solar panels placed on the Moon. I have an equation for power generated at the beginning and end of life and have hit a snag in my brain. If the solar ...
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0answers
67 views

How do you know if a decentralized solar PV is connected in series or in parallel?

I'm using a decentralized solar PV system(4 nos). I want to know that are they connected in series or in parallel ? The output current of each of my converter connected to solar panel is 4.4A. So ...
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0answers
380 views

modelling of solar cell: offset in short-circuit current

I am trying to simulate the IV curve of a solar cell in reverse and forward bias. I have used bishop equation that you can see in the following picture. The mathermatical model is in good accordance ...
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0answers
327 views

Designing a 3 mode smart solar battery charger with MPPT

I'm trying to design a solar charger with MPPT feature that runs in 3 modes (bulk, absorption and float) depending on the state of the battery. The logic is implemented in a fast micro controller and ...
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0answers
1k views

L7805C/L7812C Voltage Regulator with 22V Solar Panel Not Outputting a Constant Voltage

First, here is my solar panel: http://www.amazon.com/Instapark%C2%AE-Black-Mono-crystalline-Charge-Controller/dp/B005LR9IOG And the regulator: http://users.ece.utexas.edu/~valvano/Datasheets/L7805....
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1k views

Characterizing Solar Panel Efficiency Based On Lumen Input

I'm new to the solar power field. I am trying to mathematically determine the output of a PV system based on the amount of lumens being directed onto the system. I have a lux meter which I plan to ...
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1answer
27 views

Dual power sources (PV cell and battery)

I have a small IoT project with a 280 mAh Li-ion battery. My intention is to plug in the device and charge the battery when it dies, but I wanted to extend the battery life and have been thinking ...
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35 views

Questions about tapping a normally 60V solar panel at 3 different places

I have a PV solar panel that is 96 cell, about 60 volts open circuited, and it seems to be divided in 3 subregions which are vertical. The cells are arranged in 8 columns, 12 cells high. The panel ...
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18 views

400VDC LiFePo4 charger?

I have a solar electric system from many years ago. The setup runs on 400 to 480VDC from a string of solar panels. I have a unit that converts 250 to 600VDC to 48VDC for charging lead acid ...
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1answer
19 views

Recharging of Inverter Batteries

Is it possible for some reason I can be able to safely connect two charge controllers (who draw their solar power from the same solar panel array) to charge separate/independent batteries? (It is to ...
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1answer
38 views

one solar panel is getting more power than another panel connected in parallel

what if one solar panel is getting more power than another panel connected in parallel? say if you have two 500w solar panels and one is getting 100% solar radiation and the other due to a angle is ...
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1answer
30 views

An IC to manage Solar, USB and Battery supplies

I've been looking for an IC to manage my Solar and USB input to charge my LiPo and power my circuit and I found this IC. It seems to be able to automatically switch between USB and Vin to charge the ...
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13 views

Fail to reboot after recharge, ESP32/ESP8266 using a MPPT and 18650 battery

I try to build a solar energy operated project. I'm using an ESP32 to wake up every 45 minutes, measure bat's voltage using board's ADC, and send it to an excel sheet on Google drive. The part of ...
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27 views

Help modifying solar cell to include water cooling on simulink?

Hi, for my honours project at university i am basically doing an analysis of how water cooling a solar panel improves efficiency by decreasing the temperature of a solar cell. Part of my thesis ...
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55 views

Using Solar Charge Controller with AC Power instead of Panels

I'm working on a project here which needs to have a small SLA backup battery. I have a cheap PWM solar charge controller already and I want to use plugged into an AC power supply (48V DC out) in ...
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1answer
30 views

Solar car ventilation system

I am a mechanical engineering student and for my final project I am designing a solar car ventilation system so I need to know how much power the air conditioner of a car (Mazda Lantis 323 2001) fan ...
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1answer
18 views

Using solar to recharge a Li-po battery

I'm looking for help determining what size of solar (PV) I should use to recharge my Li-po battery after discharged. Battery Characteristics :Capacity:1600mAh Nominal Voltage: 3.7V Charging ...
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0answers
33 views

2 NICE tubular motor connections with wind sensor

Hi, I have 2 NICE Era Mat T tubular motors, working togheter with the TTBUS RS232 protocol ( Cable (1) + Cable (3) GND ). Now I have installed the 4 buttons to open/close the blinds. Without the ...
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21 views

Modeling PV + Battery Storage for Frequency Regulation + Energy Arbitrage

I have developed a PV-BESS dispatch model in Python for operation in frequency regulation market while also performing energy arbitrage. The problem I am encountering is that in some hours during the ...
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49 views

Solar Panel not producing current

I am a total electronics noob trying to start out, so I purchased a small solar panel, of 110x80 mm, of 5V and 200mA. However, when I tried it this morning and connected it to my multimeter, I only ...
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29 views

Voltage sweep circuit for non-linear voltage source

I am in a need of a simple circuit for sweeping a voltage of a solar cell and measuring the current. I started with a simple voltage regulator, such as this one: and adjusted it so it would work ...
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64 views

Need a circuit that turns on when above 4V and turns back off below 2V

I’m looking for a simple circuit design for my solar powered GPS tracker, that will keep the tracker powered off until charge reaches 4V, and power the unit back off when voltage drops below 2V, and ...