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

learn more… | top users | synonyms (1)

0
votes
1answer
56 views

Solar energy system design and calculations to power a computer

I have a computer that uses a 500-Watt power supply. Note that this is a 500-watt power supply. How much power the computer actually uses, I don't know. 500-watt supplies are pretty typical. I think ...
0
votes
1answer
17 views

Charging starter and domestic battery with solar panel

I have two 12v domestic batteries connected in parallel and one 12v starter battery. Starter and domestic batteries are connected via negative pin to main switch which then connects to engine and ...
0
votes
0answers
37 views

Running a fan off minimal solar power [on hold]

I need a little help. It has been over 30 years since I last was in a high school electronics class. I have forgotten much. I have a solar panel. I found that in low light levels I can use it to ...
0
votes
0answers
32 views

Why does charging my phone slow/stop midway when not using the national grid like with a mobile power source like a solar cell? [closed]

I recently bought a polycristalline solar cell which is built for charging smartphones, tablets and e-book-readers while camping but I want to use it for normal charging at home too. I tried it ...
0
votes
1answer
71 views

Is it possible to damage phone battery when charging with a current source?

Is it possible to damage a phone battery when charging with a current source? Situation: I am currently busy with a project where we want to use 200 watt solar panel to charge as many phones as ...
-1
votes
1answer
70 views

Combining Solar Panels Safely

I have a solar panels, with 5v with a 200ma output, I have it so this goes to a charge module which allows 3.7v lithium batteries to charge without exploding on me. If i hook another solar panel, same ...
-2
votes
0answers
51 views

Solar powered battery/USB charger

I am trying to build a solar powered battery pack, 3 x AA batteries and then use that to charge my USB device all in one little box. I've done my research and hope that what I have will work but that'...
0
votes
0answers
27 views

YX805 Datasheet Translation

The YX905 T0-94 package accepts a solar cell, charges a 1.5V AA battery and lights up an LED when it is dark. I don't know how the light detection functionality works -- maybe it is when the voltage ...
0
votes
3answers
72 views

Power a 12 volt water pump from a 110 watt solar PV panel

I have a 12 volt DC 9 amp water pump that I would like to power from a 110 watt 12 volt (17.2 volt at peak) 6.4 amp solar PV panel. I only want to run the pump when the sun is out, it's circulating ...
-1
votes
0answers
28 views

Solar battery trouble

I have an off grid solar energy system that is connected via a charge regulator to a battery bank consisting of 6 2v batteries. At the moment I have noticed the regulator going on to float really ...
0
votes
1answer
65 views

What is the correct way to hook up a second battery and solar panel to a vehicle? [closed]

I'm looking to install an aux battery in my van and hook it up to a small solar array ( 200w ). I would also like to be able to charge the second battery from the alternator when the van is running. I'...
0
votes
2answers
45 views

Can you use different Voltage and Amps to a charge phone? [duplicate]

If I buy a solar panel that outputs 18 Volts and between 250-300 mili-Amps will it charge my phone? I looked at the charger output for my phone and it is 5 Volts and 1 Amp. I know that Power (units ...
1
vote
3answers
99 views

Using capacitor as a rechargeable battery

As part of my learning of electronics, I'm currently trying to develop my own network of sensors. So far, I've managed to make myself a satisfying small setup : A few nodes, built with an ...
0
votes
1answer
59 views

How to use supply voltage for a small circuit from a huge variable power supply?

I have a 300 watt solar panel whose voltage and current need to be monitored by installing a device there. There is no source of power supply that I can use for this monitoring device but the solar ...
1
vote
1answer
45 views

Different voltage between the solar charge controller and the battery

I have a solar "box" project with a 10 W, 12 V panel and I noticed something when I was testing the battery voltage (two 12 V battery in parallel). When I measure the battery voltage directly from ...
0
votes
3answers
76 views

Solar panel without diodes

I have a 200 watt 12 volt solar panel. It has 3 diodes mounted on the back. Can you take the diodes out and the panel still operate normally in the day time?
0
votes
0answers
69 views

How to design a direct solar charger for 5v devices?

I'm searching high and low how to design a solar charger that charges directly small +5v devices. What I think that I need is: A boost converter (because I only have room for two uncut solar cells ...
2
votes
2answers
48 views

Estimate current produced by an IR photodiode on a typical sunny day

How can I estimate or calculate the current which would be generated by an infra-red photodiode (eg. Osram BPW 34 FAS) on a typical sunny day ?
6
votes
2answers
134 views

LEDs inside of solar-powered calculators

Why do a lot of solar-powered calculators contain red or infrared LEDs that are hidden from the user? So far I have only seen this in Texas Instruments calculators. Here are some examples of this in ...
3
votes
1answer
44 views

switching between solar input and 5V supply

I am designing an energy harvesting system from a low power solar panel. I am using the output of the solar panel to power a high efficiency boost converter which charges a single cell Lithium battery ...
-1
votes
0answers
8 views

Charging a single cell LiFePO4 with a 6V solar cell

I'm working on a project in which I'd like to charge a single cell LiFePO4 battery as well as be able to run a load simultaneously using a 6V ~4W solar panel. I'd like this to be done in the most ...
0
votes
2answers
30 views

Solar Cell to trigger Solenoid

I would like to set up something where I use a miniature solar cell (like this) to power a push solenoid (something like this), so that when light hits the cell, the solenoid pushes. I know basically ...
1
vote
3answers
87 views

Detecting a break in continuity where no voltage drop occurs

I have a solar charger on a vehicle which I need to protect: Schematic is down there... The charger connects to the main battery, and the solar panel, but the manual specifically states that you MUST ...
0
votes
1answer
53 views

Solar panel charging circuit

Like so many else trying to charge a power bank from a solar panel: I've got a solar panel claiming 18V and 280 mA, so 5W and a 2800 mAh power bank expecting USB in so 5V 1A. The simple "circuit" I'...
0
votes
1answer
48 views

Divert excess PV energy to floor heating in off-grid cabin?

I'm building an off-grid summer cabin with a solar PV system. I'm planning on using this equipment: 3 kWp PV panels BlueSolar 150W/70A MPPT charge controller Victron Multiplus 3000W inverter 4 x 303 ...
0
votes
1answer
66 views

Can you explain how the following garden solar light circuit works?

I found the following circuit in a solar garden light. The cut off white and black wires are from the solar panel. What does the 4 pin transistor do?
0
votes
0answers
25 views

Simulink how to convert Duty Cycle to reference voltage signals(Uref)

In Simulink I am creating a DC-DC buck converter using Average-model based VSC Universal. But one input of VSC is in Uref. For this case I need to convert Duty Cycle (D) into Uref for Input. Because ...
0
votes
2answers
82 views

Why is my solar panel short circuit rating much higher than in reality?

I have two 6 volt 100mA solar panels. I have connected them in parallel and was expecting to see a maximum of 200ma when I short circuit it. As expected, I got 6 volts, but only 65ma. Does this always ...
0
votes
1answer
38 views

In a solar power system, when the panel is off, does the battery determine the wattage?

I am considering putting together a solar system to power my wireless router when the power goes out. I just have one question that I cannot find the answer to: Does the wattage of the solar panel ...
0
votes
2answers
68 views

Why a diode is in parallel with the current source in the equivalent circuit of a solar cell?

The model of a solar cell has a diode in parallel to the current source: (source) Why is the diode in parallel and not in series with the current source?
1
vote
1answer
21 views

PV array project

I am working on a PV array on simulink and I just need help on a math question. On the article I'm basing the model on, the model voltage equation is Vm = VmT - (5- G/0.2) for the voltage to vary ...
0
votes
1answer
59 views

Should I connect solar panels in series or parallel for my charger?

I am making a solar charger for 3 AA batteries. I have two 6 volt 100mah solar panels. Will it be more beneficial to connect them in parallel to have more current or in series to increase the voltage? ...
1
vote
0answers
20 views

Theoretically simulating photo-voltaic solar panels using math/code

I'd like to simulate the behavior of PV solar panels and model how various parameters affect their performance. For example the effects of irradiance, temperature, and series and shunt resistors. I ...
0
votes
1answer
50 views

DC Bus for Solar Charge Controller Battery

I am just learning the set up for a back up power. I am just wondering whether the DC output from the charge controller or the battery can be used for multiple loads. For example, I want to power my ...
1
vote
1answer
33 views

Solar cell charging and battery chemistry for low power 2.4-3V supply?

I've recently been looking into the possibility of using an amorphous silicon solar cell (like they have in calculators) to supplement my very low power BLE system's current consumption to extend the ...
0
votes
0answers
18 views

Wire size for solar panel-Buck-Boost Converter

A DC-DC buck-boost converter supplies a constant 14V to a load that draws 2A of current. The measured efficiency of the converter is 80%. Consider a solar panel with Voc of 21V and Vmp of 18V . ...
0
votes
1answer
70 views

DIY 18650 charge pack questions

I've tried searching through existing topics but haven't found an answer. I'm a beginner enthusiast. I have a couple of questions that I would appreciate input for. My plan is to make a battery ...
0
votes
0answers
23 views

amh needed from solar panel to run and charge

So I am making a small solar powered circuit to run a pond water pump (a 6v pump 333ma) I initially bought a 6v 333mah panel (in hindsight I have realised this is wrong as not enough juice will be ...
0
votes
4answers
83 views

What should be the watts of solar panel and battery size

I want to light one 70watt bulb for 12 hours at night time. I want to know what should be the Watts of the solar panel and how much Ah battery will I require? I searched many of the questions here ...
0
votes
1answer
45 views

Charge CR927 battery with small solar cell? [closed]

I am developing a Bluetooth tracking device that uses a single CR2032 battery. Would it be worth using instead a rechargeable CR927 (40mA) battery and a small solar cell, the size they put in watches? ...
0
votes
0answers
66 views

How to connect these two led strings?

I've recently bought myself 2 sets of leds. Each set has 10 leds in a row powered by a solar panel which charges 2x 1.2V batteries. My question is what do I have to do when I want to have all of the ...
0
votes
0answers
34 views

Are you at Maximum Power when you have an MPPT circuit that outputs the Vmpp?

Iam currently simulating the maximum power of a pv cell and wants to get the MPP using the constant voltage method, though I was just wondering if it is enough that I got the Vmpp since I am only ...
2
votes
3answers
80 views

Enable grid-tied solar array power output during grid outage

I am getting close to investing in a micro-inverter (Enphase M250) based grid-tie solar array for my home, but am concerned I won't be able to use the solar power during grid outages. I found a ...
-1
votes
1answer
86 views

Automatic adjusting output into automatic adjusting input [closed]

I have a solar panel with a built-in 6-18v auto adjusting output (based on draw) and a step up/down 1.5-24v DC-DC converter with an auto adjusting input. I was thinking of using them in conjunction ...
0
votes
0answers
44 views

Solar Powered Lantern - Year 9 Project Idea

I am a Year 9 engineering teacher and I want to revise one of my current projects to be better but I need some help. The project idea is using a 1.5v Solar Panel (from a solar garden light) to charge ...
0
votes
2answers
41 views

What charge controller would be required to charge a 12v battery with 40w solar panel? [closed]

I am looking to setup a 40w (or similar) solar panel on my SUV to charge a 12v deep cycle (AGM) battery for use when we're camping and that sort of situation. I am unsure as to what sort of charge ...
6
votes
1answer
93 views

A naive solar panel maximum power point control circuit

I am fooling around with a solar panel, just to try stuff and learn in the process (not trying to produce something I would actually use). Its placement is very far from optimal - vertically behind ...
0
votes
1answer
49 views

Which battery to use to charge from 12v solar and supply raspberry pi [closed]

I'd like to run my raspberry pi via solar energy. I have a 12v 20w solar panel with the following charge controller: https://www.amazon.co.uk/gp/product/B0197ZNWLM/ref=oh_aui_detailpage_o00_s00?ie=...
0
votes
0answers
34 views

Voltage stepdown spikes in solar power system during night time

Intro: I have a personal weather station out in the mountains, so going out everyday to fix things is difficult, and it runs on solar power. I have a pro star charge controller, which has low and high ...
1
vote
3answers
92 views

solar panels in parallel

I am connecting 7 solar cells, the data or info shown below - simulate this circuit – Schematic created using CircuitLab The above schematic is how I am rigging up my solar cells. ...