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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21 views

Connecting CN3722 to Load AND Battery

Like the title says, can I do this? I got two schematics in mind about how to wire these up, which one is the correct one? This one is straightforward, but will it actually work if connected to load? ...
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33 views

Help troubleshooting my 1st hobby project using small solar panel [closed]

Since I am very much a newbie with electronics, please bear with me if I miss any important details or have inaccuracies in my description of the problem. I have a 10W solar panel, which under my ...
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12 views

How to disable battery charging in an inverter?

I installed solar retrofit to an already existing inverter battery setup. Now during daytime,inverter will be in battery discharge mode by converting DC from battery to AC for appliances use.While ...
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34 views

Small FM transmitter hooked to solar panel for constant power to battery

I am trying to figure out the best battery and solar panel to use with a small transmitter I have to pick up the animal sounds in the back yard (Birds,etc) This is what I have as far as specs Output ...
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1answer
31 views

Lightest possible USB solar charger with 5V 2A to 3A output?

I'm doing a lot of wilderness expeditions an needs the lightest gear possible. I want to make a solar charger (for my nitecore nb10000) that is as light as possible and has a USB output 5V and between ...
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52 views

Solar cell understanding of current vs applied voltage

I've been reading about the theory of solar cells, and doing some circuit simulations using the idealized model of solar cells. But I still feel like I have some problems understanding how the solar ...
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1answer
50 views

How do solar powered cars use the energy generated by the solar panels?

I want to know how companies who use solar panels on their cars utilise the energy generated by the solar panels. Do they charge the traction batteries with the solar power or do they power the ...
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17 views

How to stop inverter from charging battery using grid power and charge battery using only solar panels? [migrated]

I recently installed solar charge controller and solar panels to the inverter battery system. Here inverter also contains battery charger and other components. So now instead of connecting inverter ...
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43 views

Is there a possibility of repairing this garden solar led lamp?

I bought several solar lamps that look like this: They have a flame effect. Like all other such solar garden lamps the solar panel is too weak. When there is little sun in two days they are empty. ...
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142 views

My daughter's science project is to charge AA batteries with a solar panel

We bought a 0.5 watt solar panel with 4.5 V, a 4 AA battery holder and a 15 ampere Schottky diode 45V , and 4 lithium ion rechargeable batteries. We connected the red positive solar wire to the diode. ...
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16 views

Specific solar circuit setup recommendation?

For a setup which uses: a 100Ah 12V battery (Absorbed gel mat Lead acid), with an MPPT solar charge controller, a 12V 12-55A DC electric motor as the primary load, additionally some 12V LED lights and ...
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1answer
40 views

Low current cut off

As you know, with solar panels, current lags voltage by a lot. I want to run a DC pump straight from a solar panel. Simple, easy to maintain, low cost setup (relay, SS relay, diodes, etc.) In the ...
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46 views

Confusion regarding the I-V characteristics of a solar cell

We know that I-V characteristics of a solar cell are described through the following equation : This equation can be translated graphically to the following (ideal) circuit : Now according to the ...
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30 views

N-array of monitored old lead acid batteries with solar panels

I would like to build a system of a arbitrary number of old and different specs. lead acid batteries (recycled) working with a solar regulator (mppt or pwm, doesn't matter). The initial idea was to ...
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2answers
25 views

Voltage drop when connecting DC-DC booster XL6009 to my solar panel generating 10V constant

I have connected my solar panel (rated 6 V 3 W,) but it is generating approximately 10V. This 10V is fed to an XL6009 to generate ~15-166, which is further fed to a 4S BMS to charge. I checked that ...
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25 views

Naming the circuit of a PV-cell

I've recently been attending a solar-engineering module at university, however, I'm not on an engineering course so this module is completely new to me. This was shown on a lecture slide, however, the ...
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1answer
43 views

Solar powered iPhone for remote monitoring

I want to find a way to use a solar panel to power an old iPhone running a single app to continuously collect temperature and humidity data in remotely located beehives. The iPhone must be ...
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1answer
80 views

Can you prove that electricity was generated by a photovoltaic cell?

I am wondering if it would be possible to build a photovoltaic cell that kept track of the electricity it generated (perhaps with a built-in meter), such that you could not trick the meter without ...
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32 views

MPPT charge controllers in series to handle high voltages

If I have 500v of solar power can I run 10 mppt charge controllers in series? So each mppt would only see 50v because I'd be using 10 cheap mppt controllers in series. From there it'd be charging a ...
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1answer
45 views

Connecting lead-acid battery in parallel with lead-calcium battery

So I have a 12 V solar system (panels produce 20 V but batteries are 12 V. I also have a set of 5 batteries. One of these batteries is a marine deep cycle battery and the other is a group of five lead ...
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1answer
59 views

Solar panel specification

I am planning to buy a small solar panel where it is specified that it produces 6V and 100mAh. So does this means that the solar panel will produce 100mA in 1 hour or will it produce 100mA straight ...
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53 views

MOSFET as bypass diodes in series of solar cells

I am building a small solar system of 5 solar cells in series (each about 5V 500mA in full load, total 25V 500mA) and want to maximize efficiency in case one cell is shaded. Traditionally there are ...
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27 views

Combine DC voltages from solar panel and grid

I have a large number of DC-powered devices: most of them can operate off 8-23V. I currently run them off a mains 12V power supply. What is the most efficient way to power them off the solar panels ...
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1answer
34 views

Solar power AC DC power conversion [closed]

I am getting quote for solar power. Two quotes say I need approximate a 6400 kW system. One said I needed 5760 kW system. When I asked why the difference, this was the reply. "The 5760 is not ...
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3answers
347 views

Solar panel voltage drops when connected with load

I have a 100 watt solar panel with the specifications: Optimum operating voltage = 18.1 V Optimum operating current = 5.52 A Voc = 22.1 V Isc = 5.86 A. I connected this solar panel directly to a 100 ...
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82 views

Do I need a charge controller with BMS on 18650?

I have a 40W 22V solar panel, and 4S 18650 with a charge controller connected to them. When I connect my panels directly to the BMS I get 2A and my voltage drops to 15~16 volts. Question is, do I ...
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1answer
66 views

Measure power of solar cell with an esp8266

Scenario I plan to buy some bigger solar cells (together around 500 W) and use them to make my electricity bill cheaper. But in order to find the perfect location on my roof before the purchase, I ...
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1answer
87 views

Representation of Photovoltaic cell and BESS in Microgrid by first order transfer function

I am working in the are of frequency control of Microgrid and have come across many publications (For example: https://www.sciencedirect.com/science/article/abs/pii/S0142061515005220 (Pg 3,5)), ...
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48 views

Household inverter/battery array to supplement generator

I live in an area that's prone to occasional power outages (e.g., ice bringing down trees in the winter, hay landing on and blowing out transformers in the summer). Last summer we had a standby ...
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80 views

What is the black two-leg sensor?

This is part of the Auto Sun Tracking Pump. It is attached to the agriculture solar system but damaged and I want to replace it. I don't know the black two-leg sensor.
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42 views

Is it ok to connect the output of a solar controller to a fused outlet on a fuse panel?

The fuse panel is breakered to a battery and is used to power other low amp equipment. The model is the 6 gang blue sea panel with blade type fuses. Since the fuse panel is just a couple pieces of ...
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42 views

Noob Question, 74HC240 and Solar Cells

My idea is to start soldering and I would start with something quite simple. I chose the project (https://cdn.makezine.com/make/08/pummer.pdf), a pummer with solar cell charging up a supercapacitor ...
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34 views

Getting most power from low voltage solar powers, each different angle

I have a specific problem. I have 10 small solar panels, each max 5.5V and 100mW power. Each one is at a different angle. I want to get the most power out of it. Cost is not really a problem, but I do ...
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2answers
97 views

Effect of shading on solar panel

TLDR: Please share your experience on how much shading can affect electric current produced by a solar panel. I got some time to spend with my parents, due to this Corona situation. So, I went to our ...
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2answers
327 views

I have a solar panel with below specifications. I have some questions

As in picture Vmp = 17.40V and Imp = 0.58A implies Power = 17.40*0.58 ≈ 10W. Does it provide 0.833A (10/12) at 12 volts? What does "Max. System Voltage 800VDC" mean in the picture ?
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27 views

Monitoring PWM Solar System

I want to try and make a power monitoring system for an off-grid solar system using a micro-controller (esp8266). I started by monitoring the battery voltage (using a voltage divider and an ADS1115) ...
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1answer
36 views

Increase runtime: batteries in parallel -> buck || batteries in series -> boost

I have 18650 batteries, I created 4S packs with 6P in each. I have a 12 V 2 A solar panel and I want to use this panel to charge them ( i know I need a charge controller and I must balance charge them ...
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3answers
147 views

Solar panel not charging LiPo Batteries

I am a totally beginner in electronics and I am facing a big problem with my prototype. I am trying to create an autonomous circuit that runs an Arduino powered by a 3.7 LiPo battery. The problem that ...
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2answers
69 views

Can a large charge controller damage or explode a battery?

I have a 12V 200Ah/20Hour battery and a 60A MPPT Charge Controller. Currently, I only have 200W of solar power to charge my system (planning to upgrade to larger system soon when my proof of concept ...
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1answer
40 views

Charging Battery via solar panel to power a push action solenoid

This is my first project ever, I'm running into some problems with the power supply stage, I hope you could help! I want to power a solenoid (12v/2A), which will get its voltage from a battery (12V/...
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43 views

Would this silary battery shield work? [duplicate]

I am making an open source solar battery shield for the Arduino Uno, would this circuit work? It's pretty basic but I think it would do the trick. Also,the power from the solar cell will come into the ...
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1answer
54 views

Question about setting the MPPT on BQ24650

I have a question about the MPPT in BQ24650 chip. It has the MPPTSET pin that need to get 1.2v because the inside comparator. According to the datasheet, on ...
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1answer
23 views

Solar PV - STC, Irradiation, Air Mass

Let's assume that a panel has an efficiency of 15%. What will be the output at STC, will it be - P = 15% * 1000 W/m2 = 150 W/m2 or will there be an adjustment for the air mass of 1.5? Basically, does ...
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36 views

How to use a Simpson 262 model 2 to measure voltage and milliamperage of solar cells

In cleaning out my dad's garage after his death I found a Simpson 262 Model 2 meter. As a hobby, I fix and upgrade garden and pathway solar powered LED lights. I have a box of miscellaneous solar ...
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1answer
400 views

Why are PIN junctions better for solar cells than PN junctions?

In lecture today my professor mentioned that PIN junction make better solar cells than PN junctions. Why is this true? The PIN junction will have a wider depletion region which means it'll have a ...
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2answers
38 views

Combining DC power input from multiple erratic sources (solar / wind turbine)

My understanding level: I'm reasonably familiar with simple electrics and electronics - volts, amps, watts, simple circuits etc. I'm thinking my question is either really simple, or complicated - but ...
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44 views

Would this battery/solar powered esp32 weather station work?

I am trying to design a circuit that runs an esp32 with a dh11 sensor but i am unsure if it would work. On the top left is a mcp73831-5-OT li ion battery charging chip (the random wire on the left is ...
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1answer
47 views

Drawing energy from a 3.7V LiPo battery while simultaneously charging with a solar panel

I have a 200mAh 3.7V (0.7W) LiPo battery that I am looking to use as an energy source for a large model airship. I also have a 7.2V 100mA (0.72W) solar panel that I would like to use as a means of ...
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1answer
156 views

How to use Voltage Supervisor and MOSFET to switch off ESP32 supply?

I am planning a solar project using following components: Solar cells 18650 battery TP4056 MCP1700-3302E TC54VN2902EZB Voltage Supervisor IRLZ44N and an ESP32 I have only seen a block diagram for ...
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35 views

Simple through-hole voltage supervisor

I'm trying to power a microcontroller (ESP8266) from a solar cell and a supercapacitor. It might or might not make sense, but it's a hobby project. The thing is - ESP8266 doesn't boot if the voltage ...

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