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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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1answer
30 views

12 V 3.8 A water pump to 12 V 625CCA battery

Wanting to use car battery to power pump. Pump says it's 12 V 3.8 A, uses a 8 A fuse. Trying to sort out possible solar input needed to run pump but the numbers don't make sense. What size solar panel ...
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1answer
23 views

Designing an effective extensible solar cell + car battery setup

I've got a cabin that I visit on weekends and because I need to charge my computer and tools there, I decided to bring an old car battery and bought a solar panel to charge it. Right now I use a cheap ...
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31 views

Solar variation tolerance for a solar panel

How to estimate average variation of input solar radiation that would be tolerable for a given solar panel? On what parameters will it depend?
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30 views

Solar panel Efficiency Calculation

To find ideal conversion efficiency of solar panel, one must know incident radiation flux. [Max wattage/(flux(W/m sq)*area of panel] x100. At most of the places the flux is measured or calculated ...
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37 views

12v 10w solar panel to charge 10ah battery bank [closed]

I'm trying to charge a 10000 mAh power bank (li-ion battery bank) from a 12 V 10 W solar panel. The peak voltage according to the panels ratings is 23 V, but when I checked it is about 20 V To supply ...
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17 views

Bypassing solar charge controller using trickle charge voltage?

In an effort to simplify a small solar system and to keep the cost down, I am wondering what (if any) drawbacks there are to having the Vmp (voltage at maximum power) in a solar panel setup, at 12.5% ...
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30 views

Parallel DC sources with varying voltages

I have different DC sources which i want to hook up to a 24v battery pack. - Solar controller output - AC/DC charger - truck alternator Can i connect these in parallel? I've been told that because ...
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23 views

Dual axis solar tracker design

I am developing a homebrew dual axis solar tracker with 9 solar panels and I am trying to figure out the right set of electrical components for the tracking control I would like to control two linear ...
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2answers
89 views

How can I use an LED driver (QX5252) to light up 3 different color LEDs (Green, Yellow, Purple)?

I am trying to light up 6 LEDs with the common garden light circuit (2v Solar panel and 1.2V battery). The problem is that I want to light up 2 yellow LEDs, 2 green LEDs, and 2 purple LEDs ...
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1answer
48 views

What is this solar power RC circuit doing?

I am a CSE student working on a project. We are using a solar powered microcontroller. The solar panel's power goes through a fuse and an RC circuit with a varistor to the charging system. What ...
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2answers
33 views

How do 24v or 48v solar/battery inverters provide power for houses that rely on 110v?

I've been learning about solar systems and I keep seeing that the systems feed power in to batteries, which is then fed in to the house via an inverter, typically 24v or 48v. However, most houshold ...
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18 views

Solar Power Panels How to DIY Books

Are they any books you can recommend for learning about Solar Power Panels and how to connect them? I want to connect - 2-3 180 Watts Solar Panels as an experiment to reduce the electricity ...
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1answer
66 views

DC converters for solar cell

As we know, the voltage level of a solar cell is lower than what a rechargable battery needs, and thus a DC converter is placed in between.( With feedback control for optimum V-I curve) This just ...
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1answer
30 views

How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse?

simulate this circuit – Schematic created using CircuitLab How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse ? if no load => solar cells ...
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1answer
44 views

Connecting a Solar Panel and Power Supply in parallel, in order to power up a load

I am using a Solar Module to charge a LiPo battery. The current supplied by the solar module goes into a battery charger IC and from there to the battery. This works fine. Now I want to add an ...
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1answer
30 views

Necessary voltage to charge NiMH using Solar Panel

I'm trying to understand which voltage I need to charge my NiMH batteries so I can purchase the components to do this. Actually I have 2x AA Ni-MH 1.2 V 1900 mAh and 4x Solar Panel 2 V ...
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2answers
40 views

Powering 3 identical laptops using a solar panel

I have 3 identical laptops rated at 45W and 20V. The combined wattage of all 3 is 135W. I want to charge these laptops via a solar cell. Do I go for a solar cell rated 135W 20V or one rated 45W 20V?
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1answer
35 views

Battery sizing for motor?

I have a question regarding battery sizing and solar panel sizing ,I am not from an engineering background that's why i might need some help with this. I want to run a 24vdc gear motor 180W 11.5 amps ...
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1answer
58 views

How to charge 4 NiMh AA batteries with solar cell

I have a nice 6V solar panel and I was thinking to use it to recharge a 4xAA NiMh battery pack (nominal voltage 4.8). Is it enough to put a series diode (0.7v) to drop the voltage, or do I have to ...
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2answers
74 views

Mini solar panel not working

I have a very basic though unsolvable issue so far, I bought a (shitty) mini solar panel, outputting up to 6V and 1W (166mA), and I cant get it to work with the equipment I have or even measure any ...
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2answers
38 views

Solar panel with broken glass produces designated Voc but far less Isc Amperage

I have quite several 72 cells solar panels with cracked glass taking punch during the handling. The designated Voc is a little over 45V and almost all of the cracked solar panels (20pcs) generates Voc ...
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3answers
157 views

Best battery to power a Microcontroller outdoors [closed]

I live in a place where the temperatures can range from -20°C to +40°C in different seasons. I need to power a small micro-controller that uses very low energy with a solar panel and a battery. Which ...
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0answers
37 views

PV Device, IV chart approximations

I have this PV device and IV values shown. I am not sure if my thinking is correct for the following problems. Over what range of voltages can I approximate a ideal current? I thought that it would ...
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1answer
38 views

Solar cell failure

I am a student in high school, and I am working on a project. I got a Solarbotics Marble Machine, and I could not get the solar cell to transfer power to the motor. I talked to my Robotics teacher and ...
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1answer
34 views

Li-Ion Battery Solar powered circuit

I am currently working on a Solar powered project but I am having a hard time making it work: I have a PCB with an Arduino and a sensor, this circuit consumes 250mA for around 2 seconds every 10 ...
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2answers
171 views

How to charge lithium ion battery in series and parallel?

I want to use TP4056 in my solar power bank project to charge a lithium-ion battery (3.7 V, 2000mAh each one), but I don't know how to use it when I want to charge more than one battery. Is those ...
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0answers
67 views

New DIY project try to understand MPPT [closed]

I got used battery MODULE with the next specs "40V 18.4AH 736WH build of ninety six A123-26650 LITHIUM LIFEPO4 cell " Cell specs: Nominal Capacity: 2300mAh Voltage(nominal,V): 3.3V Internal ...
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1answer
100 views

What motor do i use to rotate a tumbler at low RPM and high torque which run by a battery charged by solar?

I am gonna run the motor to turn a tumbler of 50-85 kg @ 5 rpm MAX. The motor will be powered by a battery which will be charged by solar. So should i go for a DC or AC motor? Single phase or 3 ...
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0answers
34 views

What are the technical challenges in developing a battery-less off-grid solar PV system (solar panel + DC-DC converter with MPPT + Inverter + Load)? [duplicate]

I am trying to develop a battery-less off-grid power system. I know the obvious reasons for not deploying such a system; no backup at night etc. Also, I understand that current MPPT charge controller ...
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0answers
33 views

Transistor for high power application in photovoltaics

I have the following situation, where there is a need for a switch with low conduction losses and controllable variable resistance, to cut-off photovoltaic (PV) panel. The PV panel is in series with ...
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1answer
62 views

what size battery storage is needed to provide 10A at 115v for 5 continuous hours

I have a two part question: What size battery storage is needed to provide 10A at 115v (I meant 115v AC) for 5 continuous hours? what size solar array (assuming proper alignment, etc.) would be ...
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4answers
171 views

How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
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1answer
73 views

Apply voltage to a solar cell

I was thinking about a power circuit in which the power can be supplied on the same rail through a solar panel or an ac adapter. I automatically thought to add diodes in series to form an OR gate, so ...
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1answer
39 views

3.5v solar panel Li-Ion battery charger

I am planning on recycling some cheap low voltage solar panels that came out of a gardening light. I have two of these modules, that soldered in series provide a voltage of around 3.5v (on direct ...
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0answers
65 views

Charging 12 V battery from solar panel

I just bought a rav power 24 w portable solar charger. It perfectly charges my phone, power bank etc. I intend to do a little bit of hack and use it charge my 12 volt battery and motorola battery. My ...
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2answers
60 views

Solar powered LED via capacitor?

I am building a large garden peice in wood, which I hope to illumine from within, powered by a small, (perhaps 90x65, 6v, 0.6w 100mA as space is limited) solar panel. After testing, I noticed that ...
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1answer
40 views

Dual axis solar tracker with singlr LDR

I'm working on dual axis solar tracker project, but the task I was given was to make a solar tracker work with a single LDR (Light Dependent Resistor). The LDR would be placed in a pipe which is ...
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1answer
77 views

How does voltage output of a solar cell increase/decrease?

I am confused on how voltage and current work in a solar cell. I know that current is affected by the amount of sunlight the cell receives from the sun, and the voltage of the cell is based on the ...
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1answer
92 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
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1answer
50 views

Wrong output on solar inverter

I have started working on proteus two days ago for my college project and I’m having some problem in the solar inverter. Diagram which I refered for making this inverter: And I tried to recreate ...
2
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1answer
88 views

solar panels: multiple roof surfaces on one inverter string?

Notice below part of electric scheme as designed by solar company: On the left you can see inverter used - Delta Solivia 7.6 TL (see Operation and Installation Manual for details) which supports up ...
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0answers
11 views

Connection of Solar Array in Series in Matlab Simulink environment

I need to simulate a solar photovoltaic feed induction motor system. I need to connect 12 solar array/module connected in series to increase open circuit voltage. I have modeled a solar array of 36 ...
2
votes
1answer
173 views

How to efficiently charge 48V battery-motor system with solar panels

I'm wondering how to efficiently charge and use the following system with standard 18V solar panels: 48V lead-acid battery 1kW electric motor To charge the battery with either PWM or MPPT, the solar ...
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1answer
27 views

How to do high switched current from small solar

I am working on a small, solar-powered application that makes use of RF and a few higher-power sensors. Those will only be on for a fraction of the time, but might consume 1A-2A at 3.3V. The ...
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3answers
42 views

Will lower voltage power source supplement/charge higher voltage power source?

I would like to add a 4.5V 1.5W solar panel to supplement an existing electrical setup in my vehicle. My current setup is an Arduino and other electronics wired up to an "add a fuse" in the car fuse ...
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2answers
230 views

Chicken coop door opener circuit

I'm designing a circuit that will open a chicken coop when the sun comes up. I've attached a bungee cord to the door which opens the door when a pin is released. This pin is released by a car door ...
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1answer
32 views

What kind of setup can take portable solar USB power & charge a AA battery charger that is usually designed to plug into a wall? [closed]

I have a portable solar panel that generates 21w of power, seen here: enter link description here . It has a USB connection wired into it that will accept a USB cord to charge small devices via USB. ...
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1answer
102 views

Solar Power with Battery Backup Circuit

As a disclaimer, I'm a novice when it comes to electrical engineering and I am looking for assistance in order to complete my endeavor. I have spent the past few weeks teaching myself concepts and ...
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1answer
73 views

Slow-start lead-acid charge - good or bad?

I have a 300Ah battery which is near-dead (Abused in the past, around 5 years old) and want to replace it with 4-6 new 100Ah. The current method of charging is with a 30A MPPT solar controller. As ...
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1answer
76 views

Use solar cell to power and communicate with chip in IR

I have a slightly movable (torsional (freely for infinite degrees around the z-axis) and translational (+- 40mm in the xy plane)) microcontroller in communication with a fixed one. I'd like to use it ...