Questions tagged [solar-cell]

Solid state electrical device that converts the energy of light directly into electricity by the photovoltaic effect.

Filter by
Sorted by
Tagged with
-3 votes
1 answer
62 views

DC-DC Converter voltage drop on load [closed]

I bought a DC-DC converter to charge my devices with the 20V 1Amp current of my solar panel. I set it so it would convert to 5V but when I connect to load the voltage drops to 4.7V or less depending ...
user avatar
0 votes
0 answers
4 views

Automatic Timer Solar Cutoff [migrated]

My inverter insists on trying to get the last few rays, even when the inverter is really seeing 0A. With the lithium battery things are worse, in that the custom "back to grid" settings are ...
user avatar
0 votes
2 answers
56 views

Determine voltage and current for given I-V curve

Excuse me for my noob question, I'm new with solar panels. I'm trying to understand what value of current\voltage a charge controller gets in a given moment. Lets say that on given temperature and ...
user avatar
0 votes
0 answers
19 views

Solar charge controller

I have a question related to pwm charge controller .If I have 120W,22V PV pannel and i have to charge a 12.8V ,54Ah battery,which solar controller to use, pwm or MPPT?
user avatar
0 votes
1 answer
45 views

Matching Solar Panel to TP4056 Charge Controller

I would like to match solar panel (6 V\1000 mA) to charge controller based TP4056 in order to charge 18650 battery around 3200 ...
user avatar
0 votes
0 answers
31 views

Using negative supply rail instead of ground in SMPS IC

I'm working on a solar power inverter I noticed that all PWM ICs using negative 12 rail as a gnd... As an example a PWM IC SG3524 which is used to convert batteries voltage to high dc bus voltage used ...
user avatar
0 votes
1 answer
47 views

Boost converting 0.5V PV output to charge a super capacitor

I want to charge three 2.5V 700F super capacitors in series (7.5V total) to a precise 6V so that I avoid overcharging a single capacitor in the string. (Conservative 80% voltage to avoid having to ...
user avatar
  • 211
0 votes
2 answers
38 views

If we change the PV panel, should we also change the MPPT controller block?

I have 6kw PV panel, in case of partial shading it's capacity reduces to 3kw. But, the MPPT tracker I designed it specifically for that 6kw rating, now because of partial shading the same MPPT tracker ...
user avatar
0 votes
0 answers
46 views

When I connect a battery, the system fails

I have a standalone PV system with boost converter using perturb and observe (P&O) as the MPP algorithm. The values of input, output capacitors, inductor are calculated correctly based upon a ...
user avatar
0 votes
0 answers
36 views

How to asses the performance of an MPPT algorithm?

I have a standalone pv system with PV Panel rating 6820W, a buck converter, 12V battery , DC resistance (load) of 8 ohm with Perturb and observe (P&O) as the control algorithm. Upon simulating, ...
user avatar
0 votes
2 answers
49 views

Can anyone explain the role of some of these blocks in this PV inverter system?

I get the role of following blocks: 1)MPPT controller (is a matlab function code of Perturb and observe) 2)boost converter 3)H-bridge inverter and its PI controller. I don't get the role and working ...
user avatar
0 votes
0 answers
35 views

How to calculate the maximum load that a standalone PV system can handle?

I have a 6820W pv panel, a boost converter, a H-bridge inverter, a 48V 540Ah LI-ion battery, a 100ohm dc and a 100ohm ac load in my system. My question is what is the maximum load that this system can ...
user avatar
0 votes
2 answers
63 views

IV curve has non zero current in open circuit condition

I have an IV measurement program running in LabVIEW, where I measure the IV curve of a photovoltaic module using a programmable electronic load from a quick backward sweep (from Voc to Isc.) I have a ...
user avatar
  • 1
0 votes
0 answers
38 views

How to model solar photovoltaic array in spice?

This is the circuit I need to simulate in KiCad and ngspice. simulate this circuit – Schematic created using CircuitLab Can I encapsulate the above circuit into a variable in ngspice so that ...
user avatar
-1 votes
1 answer
222 views

Do razor blades work as solar panels?

I want to know if there is any scientific background to the use of razor blades as solar panels. Would someone please explain how this composition of blades will generate electricity when put in ...
user avatar
2 votes
2 answers
79 views

Is there a way to measure potential power output of photovoltaic panels?

Is there a way to measure the current power output of solar panels? I know how to measure voltage and current with an Arduino. What I don't know is how to measure the "unused potential power"...
user avatar
  • 159
0 votes
1 answer
58 views

Solar cell outputting voltage but 0 current

I recently acquired some small solar cells. When I go to measure the voltage, I get a clear reading, between 190 - 300 mV but hen I try measure the amperage, I get 0 amps, even with the multimeter set ...
user avatar
4 votes
1 answer
77 views

Solar panel for 6 V, 1100 Wh battery

I have a sensor in a remote area that draws 15 mA @ 6 V for 16 hours each day, powered by a 6 V, 1100 Wh low discharge battery. I'm trying to achieve around 2 years of autonomy. Daily consumption is 1....
user avatar
0 votes
1 answer
60 views

How to limit voltage to equal or less than 6 volts for MCP1826 Vin?

Voltage from solar panel could exceed the 6 volt maximum Vin specification of the MCP1826-3302 LDO. How can voltage be kept below Vin maximum specification? MCP1826 datasheet How should the PWRGD pin ...
user avatar
0 votes
0 answers
16 views

If composite transparent materials thermal and electrical conductivity can be adjusted t what would be benefit?

Will it be provided less thermal and electrical gradient to support less dissipative system development for opto-electronics and related technologies? For thermoelectric design how it cold be ...
user avatar
0 votes
1 answer
72 views

When use Zener Diode and when use Voltage Regulator IC in regulating voltage?

This question maybe general question, but I have my own case like below. I'm planning to make solar cell phone charger. I found 1 solar cell with this specification as follows: ...
user avatar
1 vote
0 answers
50 views

How to connect a 20 V/0.6 A solar panel to a 3.7v/4000mAh battery and 1amp load

I have a 10 W solar panel, which I can see outputs approx 20 V in bright sunshine and is rated at approx 0.6 A. I have a 3.7 V 4000 mAh (14.8 Wh) li-ion battery. I want the panel and battery to form ...
user avatar
  • 131
1 vote
1 answer
43 views

Solar panel battery charger

I am looking for a way to power my webcam without having to use a long extension cord outside. I have come up with this circuit. Will it work? Can I improve it? Thanks in advance for the help!
user avatar
  • 13
0 votes
0 answers
33 views

MPPT solar buck charger - how does it sense when to change charge stage/regime

I have a well-engineered MPPT buck solar charger that I am looking to repair; the schematic is unavailable. The charger is unstable, and randomly changes what charge regime it's in. Does anyone know (...
user avatar
2 votes
1 answer
43 views

Can I use 10A solar controller with one 445 watt panel

I am wondering if I can use 10A PWM controller with 445 watt or 625 watt solar panel.
user avatar
  • 121
4 votes
4 answers
192 views

Are solar panels ever used to remove energy?

Solar panels convert energy from the sun into electrical energy. Following the first law of thermodynamics, this means they remove some of the solar energy that would otherwise most likely be absorbed ...
user avatar
2 votes
3 answers
388 views

Why doesn't the voltmeter show the charging voltage when connected to a solar controller's battery connection?

My understanding is, for charging to occur, a solar charge controller needs to output at a higher voltage than the battery's voltage. If so, why, when you test the battery connection of a solar charge ...
user avatar
2 votes
3 answers
2k views

Why does this solar panel powered dc motor not spin?

I am a complete beginner at electronics and am encountering this problem with connecting a solar panel to a dc motor: According to some demonstration videos, the dc motor starts spinning right after ...
user avatar
0 votes
3 answers
123 views

Why does solar voltage drop under load

I have a floating solar pump with panels putting out 30 volts and 360 watts. The meter shows 30 volts at the pump end but as soon as I connect the 24 volt pump it drops to 3 volts and obviously doesn’...
user avatar
  • 9
0 votes
0 answers
37 views

How to do a solar charging circuit and a discharging circuit to a single battery?

I have a solar charge circuit with 6v solar input and a 5 V, 1 A USB output and connected to a 3.7V LiPo battery. Since I needed battery % display 5 V, 2 A USB output I needed to add a circuit for ...
user avatar
0 votes
1 answer
46 views

Can I charge eight 3.7V 2600mAh Li-Ion batteries with a ~5W solar panel without problems?

I'm thinking about using a solar panel to extend the life of an IoT device. However, I'm questioning if this will give me good results or if it will only be an expense that wouldn't give any benefits. ...
user avatar
0 votes
2 answers
124 views

Loading a solar panel when PCB is without power

I need to be able to load some solar cells even when the PCB is without power. The basic set up is as follows: When the PCB is without power, the load on the solar cell should be R3 and the switch to ...
user avatar
0 votes
1 answer
101 views

Why are low band gap semiconductors (like silicon) not ideal for most solar cells? Are their atoms ionized by higher-energy photons?

Most sources on the web say that 1.3 eV or 1.4 eV is 'ideal' for most solar cells... What happens to lower-gap, gapless or overlap materials (conductors)? Are they ionized, rather than sending their ...
user avatar
0 votes
0 answers
73 views

Solar charger with load sharing

I'm looking to upgrade my TP4056 with load sharing charger for my weather station that is working on li-ion batteries. I'm looking for a simple solution without complicated parts, since I'm not very ...
user avatar
  • 101
0 votes
0 answers
76 views

How does solar PV modules array Power, Voltage in Series/Parallel affect maximum power efficiency

I have been struggling with my homework on my course (Solar PV Panels) today. Edit : PV Module parameters are below. These are for STC. In our case, it's 650 W/m^2 and 55°C. I have calculated IL and ...
user avatar
0 votes
0 answers
40 views

Component protection and charge optimisation for Solar + Supercapacitors

What are the best protective practices for solar cells and supercapacitors when they are used for small outdoor projects? Moreover, are there any way of widening the useable voltage output range of a ...
user avatar
  • 456
2 votes
1 answer
45 views

Ultra-low power solar cell help

I need your help… Scenario: Use case aside, I have an ultra-low power source (1.5v solar cell) and it is charging a 10uF cap. The solar cell is in a highly controlled low light environment with well-...
user avatar
1 vote
1 answer
50 views

Multiplexer behaviour with no power?

I am using the ISL84781 8-to-1 Analog Multiplexer. The use case is that the multiplexer is going to go on a cubesat for testing power output from some experimental solar cells. I am not quite sure I ...
user avatar
-1 votes
1 answer
64 views

Efficiency of a solar cell

I am from Colombia where recently was opened a solar park with a power of 61 MW link to news I consulted the Solar radiation in the area and has a value of 5 kWh/m², the solar cell efficiency is 20%, ...
user avatar
  • 5
1 vote
1 answer
224 views

Parallel-series connection of an odd number of solar cells

I plan on having the following array in my system: Vmpp voltage at max. power point for each cell is 1.67 V Impp current at max. power point is 18.4 mA As the number of cells in the right "...
user avatar
1 vote
3 answers
62 views

How do you charge a LiPo and manage system load (using solar power)

I am designing a wireless sensor node and want to implement a solar power charging circuit. From my research, I'm aware you shouldn't use a LiPo to power your system load while it's being charged. ...
user avatar
  • 283
1 vote
0 answers
90 views

USB-C power delivery, how to power 20V pd device from "dirty" +20V source?

I want to charge my laptop from a solar pv panel. It charges via USB-C and so I bought a cheapo usb solar panel off ebay and a "power bank". Turns out, the "power bank" is only for ...
user avatar
  • 111
0 votes
2 answers
85 views

Best way to charge 12V AGM battery from 36V lithium ion battery cluster in solar car?

I have about 10KW of lithium ion 36V hoverboard batteries that I want to connect to my 12V AGM battery in my Prius. I am placing several 18V solar panels in parallel instead of series on the roof of ...
user avatar
1 vote
0 answers
63 views

Solar panel to USB conversion

I have a 12V 10W solar panel that I'd like to use to charge a power bank (USB input). Here are the stated characteristics: V(max power) = 19.5V, I(max power) = 520mA, V(open-circuit) = 22.5V, I(short-...
user avatar
2 votes
2 answers
60 views

Power loss during 12v to 6/3 volt

Does power loss happens while converting 12 volt DC to 6 volt or 3 volt with any method like using resistor, buck converter, divider Which Wil give best efficiency running a dc light with 12 volt or ...
user avatar
-2 votes
3 answers
169 views

How much power can a 10W solar panel produce under ideal but achievable conditions? [closed]

How much power can a 10W solar panel produce? Can it go beyond 10W?
user avatar
  • 157
0 votes
1 answer
34 views

Supercapacitor Solar Cell Locking Device

I am trying to use a solar cell to power a locking device. The solar cell being used is a custom 10W 9V. It charges a lithium ion battery which is used to power an MCU and a couple of other things (...
user avatar
4 votes
3 answers
1k views

Solar panel operating point?

I have a project to power a 12V well pump from a solar panel, no battery. My plan is to use a 270W panel and a 12V DC-to-DC converter. Under reasonable illumination the solar panel is overkill ...
user avatar
  • 49
1 vote
1 answer
33 views

PV operation points due to load changes

I couldn't find anywhere what happens to the operation point of a PV cell, when, a resistance (load) connected straight up its output, changes (step) from one value to another. With other words, ...
user avatar
  • 11
0 votes
1 answer
67 views

Need help on solar light auto on off dawn to dusk

I have 36 Ah battery. I will charge it through solar change controller or through inverter. I want to connect this battery to two 9 watt DC LED garden lights which will turn on and off automatically ...
user avatar

1
2 3 4 5
22