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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4 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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50 views

How can I switch solar panels on and off with a microcontroller?

I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.) My charger doesn't have an option to monitor individual cell voltages. ...
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77 views

CN3791 not charging battery?

I have a CN3791 module wired up to a 18650 cell and that is powered up by a 18v 10W solar panel. I don’t know why, but the battery is barely charging (0,1V in three hours). Can someone tell me if they ...
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25 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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1answer
58 views

Are bypass diodes in low voltage solar panels with parallel cells really needed?

I have 5 solar cells, ~3W ~3.3v 900mA each, a total ~15W, connected in parallel. Considering the low voltage and current involved, do I still need a diode attached to each cell? Will I still risk ...
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51 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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147 views

Why is it desired to divert the surplus PV power into a resistive load?

From wikipedia/Maximum_power_point_tracking: When the batteries in an off-grid system are fully charged and PV production exceeds local loads, an MPPT can no ...
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1answer
86 views

I'd like to make a Led that lights up by solar panel [closed]

I'd like to make a solar panel that lights up an LED, not by charging a battery to power the LED, just live energy it is getting from the sun. I'm a real noob and need some advice. What panels should ...
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55 views

Big photovoltaic current

A photovoltaic cell is just a photodiode connected to a resistor.Now if simulate this circuit – Schematic created using CircuitLab I put many photodiodes in series , this would create a bigger ...
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113 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
45 views

Can I connect an inverter supply and AC mains supply in parallel? [closed]

Consider a solar panel is used to charge a battery and the battery supply is fed to an inverter. When the mains AC supply goes off then the backup battery supply kicks in. Suppose I want to reduce my ...
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48 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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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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59 views

What will happened to the electric/electronic equipment if we supply with different Cos Phi?

In some part of our country, the cos phi is 0.9 while in some other is still 0.8. The higher the cos phi the better. The power is belong to government (say the name is MAINS). Different cos phi is ...
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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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1answer
77 views

Solar battery draining too fast

So I have a Bosch L5077 180A 12v deep cycle sealed Pb battery for my solar setup. I bought it recently (2 weeks ago) but since the weather was rainy the last 2 weeks and the solar panels didn't ...
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1answer
17 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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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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36 views

Solar Module Voltage when bypass diode activate?

What happen to the voltage level when a solar module is shaded and one of its bypass diode is activated? Assuming this solar module has 3 bypass diodes. I have been reading and can't seem to ...
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1answer
67 views

How to reduce to 10 V from a 44 V, 18 A solar panel supply?

I get 44 volts, 18 amps and 700 watts from two solar panels. I want to reduce approx 10 volts to run my inverter directly on solar panels instead of batteries during the daytime.
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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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1answer
47 views

How does a solar cell its relative thermal coefficient “alpha” expressed in 1/K relate to %/K?

Some times I see the relative thermal coefficient of solar cells Isc (called "alpha" or α) written as 1/K, other times as %/K. ...
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56 views

Why solar panel voltage remains rather constant while current increases?

Did an experiment and found that when the light intensity shinning onto the solar panel increases, the measured current increases while the measured voltage remains more or less constant with very ...
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1answer
73 views

DIY solar tracking system without any sensors

I'm building a tracking system for my university project. We will use two solar panels, one without tracking system and other one with tracking system and see the results if it's worthed or not. But ...
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1answer
37 views

Cable length and voltage drop in offgrid solar installation

I have connected my Lithium-ion battery pack(11.1v 100ah ) with my Epever MPPT charge controller using 5M length of 8 AWG cable. when i put load which consume around 12A , the charger controller shows ...
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1answer
70 views

Storing solar panels in direct sun

What is the best way to store solar panels when not hooked to a charge controller in direct sun? I was thinking about hooking each panels pos and neg mc4 connectors to itself so it will not be ...
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1answer
62 views

21v solar panel safety issues, and how to get a consistent 12v from it

We just bought a 50w 12v solar panel but it's actually getting 21v in full sun. Are there any safety issues we should take into consideration with this getting producing almost double what it's ...
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2answers
39 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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48 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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28 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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1answer
46 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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1answer
49 views

Power-supply made of battery+solar cell, ultra low power

In various scientific calculators, we can see that they have "twin" power, basically a mixture of a solar cell and a battery. I would like someone to tell me what kind of circuit usually takes both ...
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43 views

Small solar panel and diodes

I am planning to use this small solar panels to charge a 18650 cell with this charger module and power a low power project with it. I've never worked with solar cells, although I have read a lot from ...
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2answers
221 views

IV curve on this solar panel datasheet

The IV curve of this solar panel looks okay, but the axes values don't seem to match up with the tabulated values. Datasheet states that 6.70 V, 36.6 mA at mpp. Can anyone tell me the relation between ...
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1answer
111 views

Problem with Proteus Simulation of Buck Boost Converter - please help

I built the attach circuit, I was simulating a solar panel buck boost voltage regulator to regulate the output voltage. The problem is that while it works and shows the appropriate output. It doesnt't ...
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2answers
70 views

How does Solar Cell efficiency relate to Band Gap/ Isc/ Voc?

I am trying to understand how does the band gap Eg relating to the solar cell efficiency. Efficiency is defined as VocIscFF/ Input power. if we have the same Voc * Isc product , that will translate to ...
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1answer
75 views

How can I determine how much power my solar panel outputs during winter?

Hi I have a circular shape 7cm in diameter solar panel rated at 5.5V 80mA = 440mW. My question is how much power would it output on average during the winter when there is about 8 hours of day light? ...
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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 ...
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1answer
92 views

CPU fan connected to solar panel will run but wont start

I'm trying to run a 12V 0.09A CPU fan directly off a 5W solar panel (not ideal, I know). The panel runs the fan fine, even in morning and evening sun. However, the fan will not restart without a push ...
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1answer
50 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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66 views

MPPT controller with battery management system

I'm trying to create a little solar charger with backup battery for my Arduino. I would like to use a MPPT controller for the solar panels. I found a few solutions like the IC CN3722, but all of these ...
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2answers
87 views

How to connect solar panel to boost converter

Here I design a boost converter with 5 V input and 19.37 V output and it is working very well when the source is DC battery but when the source is a solar panel with also 5 V output I ...
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5answers
99 views

How Can I connect My Solar Power System? [closed]

I brought this 50A Solar Controller now I want to connect an inverter to it and they said to connect the inverter directly to the battery. I also brought a 100W Solar Panel and MC4 Wires, etc What ...
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276 views

Solar power to USB C PD

I want to convert direct sunlight energy into usb c pd. USB C Pd then will be used to charge a powerbank. The bank can be charged via USB C. The actual solar panel is this: https://www.amazon.de/...
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3answers
206 views

How can I trickle charge NiMH batteries as part of an IOT controller?

I have built an IOT motor controller board that's powered by 4 AA NiMH batteries in series. I want to use a solar panel to trickle charge the batteries, but the voltage slowly decreases even when the ...
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0answers
85 views

TP4056 - Li-lon Battery Charger enable pin not working

I designed a small lithium battery charger with the IC TP4056 but apparently the enable pin (CE) is not working. My setup is depicted in the following block diagram: Basically the input voltage (...
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1answer
28 views

DC current surge suppression

How can I reduce or supress the in-rush current for an inverter? I have a pair of 100 watt solar panels feeding into a solar regulator (TPS 1230) which is connected to a 12v 100 Ah lead acid battery ...
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1answer
183 views

How to repair solar panels without being able to source an exact replacement diode

How can I repair a solar panel (replace the blocking diodes) without access to the exact same components? I have a 100 watt 20volt semi-flexible solar panel marked PV-XC502 on the junction box, ...
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1answer
32 views

Two power sources into appliance (12Vdc)

I am creating powering board for LED strips inside the cacti glass house. It consume 12V DC around 2 amps. I would like to power them up from battery (charged by solar, lead-acid battery 20Ah), but if ...
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1answer
62 views

How to power a 10-watt electric circuit without grid connection in cold countries? [closed]

What options do we have for powering electric circuits without access to electric grid? For instance, to power a 10 watt LED lighting at night? The motivation to the project is to add some lighting in ...