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

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-3
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0answers
24 views

Variable/Unstable PWM output in MPPT algorithm

I am trying to implement MPPT algorithm but seems to me I'm unable to generate a stable (fixed) duty cycle at a particular value of ADC. The code I'm using is as follows : ...
0
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1answer
32 views

Calculating minimum trickle charge power requirements

I'm looking to buy a solar panel to trickle charge my phone + other devices while out and about. Obviously I don't want a panel that is excessively large/heavy but also I want something that won't ...
0
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1answer
21 views

ICSwitching between solar panel and batteries

I would like to charge the NiMH batteries, when there is excess power from the solar power and use the power stored in the batteries, when I need it (to drive a motor and at night). I have the ...
1
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3answers
68 views

Prevent voltage to drop under threshold in solar panel

This is a solar charger for my smartphone built with two panels wich I want to keep attached all day long with the phone turned on. When the sun is going away, voltage output starts to go under 5V and ...
0
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1answer
42 views

Solar Charge Battery Low Voltage Disconnecting

I have a 4.2V 120mA max solar panel and 3.7V 1200mAh battery. I'm trying to make a solar power system for my arduino. I search through battery management IC's and generally understand the charge ...
0
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0answers
17 views

Will this Solar Charger Controller Fry my Arduino Mega? [duplicate]

I recently bought this solar charger controller: http://www.amazon.com/Instapark-SS1203-Solar-Charge-Controller/forum/-/-/1?_encoding=UTF8&asin=B004XCZN5S It outputs 12V at 3A to a load. Can ...
0
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0answers
46 views

L7805 Not Outputting Current from Solar Panel

This question goes with a question I had a week or so ago here if anyone is interested. L7805C/L7812C Voltage Regulator with 22V Solar Panel Not Outputting a Constant Voltage Anyway, here are the ...
0
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1answer
88 views

24 Hr A Day Powered Aquatic Pump

I am looking to install a DC 12V 6W submersible aquatic pool pump for use in a small scale hydroponic setup. The location of the beds will be too far away from mains electrical, and I would like to ...
0
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1answer
60 views

Solar panel and little computer fan

OK here is the spec: Solar Panel 4"x6" 200mA 7.2v Fan small : 20x10mm, 12vdc, 60mA, 2.17cfm medium : 40x20mm 12vdc, 140ma, 8.28cfm What I'd like to do, is to be able to run the fan hook to ...
1
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0answers
77 views

L7805C/L7812C Voltage Regulator with 22V Solar Panel Not Outputting a Constant Voltage

First, here is my solar panel: http://www.amazon.com/Instapark%C2%AE-Black-Mono-crystalline-Charge-Controller/dp/B005LR9IOG And the regulator: ...
0
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0answers
35 views

Discharge limit on a 12V 9800mAh Lithium-ion Battery

I am running a 12V solar system that powers a 5050 LED light bar of 7.4W. Powered by a 25W mono PV and has a total 12V storage of: 1x 6800mAh 1x 9800mAh (Lithium-ion batteries in series) The ...
0
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0answers
61 views

Solar cell powered supercapacitor charger with strange output voltage regulator problem

I have a strange problem in a low power circuit design. I designed a buck-boost converter as a maximum power point tracking circuit (control the output of solar cell within a small voltage range ...
1
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1answer
116 views

Using a Zener to protect devices from solar overvoltage

I am making some pretty crude devices that are directly powered from solar panels. The instability is not an issue, but I want to avoid over-voltage. I am using two 100W panels in series and want to ...
0
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2answers
120 views

Single inductor buck-boost idea for MPPT (maximum power point tracking)

Basically my inspiration is this guy's work. A buck converter that provides MPPT as long as the solar voltage is higher than the battery voltage. But I want to extract power to the battery even at low ...
0
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1answer
48 views

How does physical damage affect the performance of photovoltaic cells?

I am working with an array of monocrystalline solar cells. The array consists of a number of modules, each containing several individual cells wired in series. Unfortunately, the encapsulation on the ...
0
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1answer
84 views

Input voltage of LM317 drops when lead acid battery is connected on output

I have built a voltage regular circuit with LM317. Its input is connected to my solar panel. As in many circuit examples, there is a voltage divider to bias the adjust pin. Also, I have connected a ...
2
votes
2answers
71 views

In-Flight LiPo Charging via Solar Cells

I am attempting to use thin, flexible solar panels to charge a battery on a plane (RC) for a school project. After fully charged, I will begin flying the plane, and the panels will hopefully extend ...
0
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3answers
63 views

Converting variable voltage to constant voltage / variable current

I'm using solar panels + a micro wind turbine to charge a decent sized LiPo battery using this circuit - http://www.adafruit.com/products/390. The problem is that the solar/wind stuff will produce a ...
0
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1answer
90 views

Powering circuit from 12V with stand-by battery + solar charger

I did some research but I haven't been able to find the information that I really want. I am building a home made security system consisting of several IP cameras. Brownouts are very frequent so I ...
0
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2answers
48 views

Is it realistic to power a Raspberry Pi & Canoscan 9000f scanner off a solar array/battery bank in an off-grid setup?

The scanner would be scanning for 15 minutes each hour, and the raspberry pi would be always on or could be turned off between scans. What specs would I be looking for in a solar array? Canoscan max ...
1
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1answer
63 views

solar panels connected in series and parallel

Can I get 500 kW from solar panels using series and parallel operation? If I connect 18 panels each of 250 watts 24 volts in series to get 415 volt direct current and 116 panels in parallel to get ...
2
votes
1answer
134 views

Solar and battery for small usb camera

As the title suggests, I'd like to power a Dropcam without laying new wire in our community garden (code enforcement makes wiring a headache). When I wired my Raspberry Pi to work off solar power it ...
0
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2answers
146 views

Can I run this motor off of this solar panel?

I am trying to build a solar powered boat, and I have decided upon this 5V, 500mA panel. I can buy 3 or 4 of them to get up to the necessary voltage and amperage. The problem I have is that I can't ...
0
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1answer
45 views

Using a solar car battery charger to power a solar boat? [closed]

I am participating in a contest in which I need to build a solar boat (it has to fit into a 1.5' wide by 2' long by 1' high box and draw less than 2"). I currently have a 12V solar panel made for ...
3
votes
1answer
106 views

Circuit for charging RC car battery with solar

For my high school engineering course I have to make a project that involves solar panels. I have chosen to convert an RC car to recharge the battery while driving with solar panels, because I realize ...
0
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1answer
53 views

Rate of Laptop Battery Charging

Assuming I have a working solar panel system, all the things such as inverter, charge controller and battery are in place. The state of battery will obviously change, some times it will fully charged ...
0
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1answer
229 views

Arduino Project powered by Solar or Battery

After searching quite a bit on this topic I'm a little lost. I am new to the electronics side and am constantly learning more as I go along. I have a project where I'd like to power an Arduino Uno by ...
1
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1answer
71 views

Equation for a capacitor charged by a decaying current source (solar cell)?

I have a solar cell charging a capacitor. I want to find the amount of time it'd take for the capacitor to be charged to, say, within 0.01% of the final value (the open circuit voltage). I'm trying to ...
1
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0answers
60 views

Equivalent circuit for solar cell

I have a question regarding the equivalent circuit for a solar cell. The circuit includes a diode to model the p-n junction of the cell. When some part of the photo-generated current flows through ...
1
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1answer
44 views

Looking for some solar panels to go with this project

I've been looking around for some solar panels for a little homemade solar phone charger project. I recently found a portable phone charger project from a student at Cal Poly which I'm hoping I can ...
0
votes
1answer
126 views

Converting Short circuit solar cell (5v to 50mA)

How to convert solar cell short circuit current to Voltage. Because i need to display it to a 10bit micro controller. The voltage must within 0-5V. I'm using a 3V 50mA (max output) solar cell. ...
1
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1answer
93 views

Measuring Voltage and Curent Simultaneously with Probe?

I have very little experience with electricity, but I am doing a project in which I need to measure power output of solar cells. I am currently using this: ...
0
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1answer
59 views

Solar power charge controler

I have a gizmo im trying to build and am running into some problems. I need to power a time punch clock 24 hrs a day drawing 1.2 Amps. I am trying to run this from a deep cycle agm battery with a ...
1
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0answers
47 views

Characterizing Solar Panel Efficiency Based On Lumen Input

I'm new to the solar power field. I am trying to mathematically determine the output of a PV system based on the amount of lumens being directed onto the system. I have a lux meter which I plan to ...
1
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1answer
79 views

Solar charge controller low wattage panels

Do I need a solar charge controller for low watt/low battery voltage situations? This site says that they are generally not needed: http://www.solar-electric.com/solar-charge-controller-basics.html ...
3
votes
1answer
300 views

MPPT Boost Converter - Output Voltage

I am working on design of a MPPT for charging batteries via solar panels. After doing some reasearch, I am a little confused as to how the boost converter can output a constant voltage, as well as ...
0
votes
1answer
128 views

Charging lithium batteries with solar panels

Let's say I have a battery pack made from 3 lithium-ion cells connected in a series (making a battery with around 12 volts). That battery pack has a PCB with balancing function and also protects the ...
1
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1answer
427 views

Building a low-power solar/wind buck-boost converter

Using a 18V(max) solar panel, I'd like to charge a 12V lead-acid battery. I'm working from the basic inverting buck-boost circuit. My main question is, being a relatively low-power circuit, can I ...
3
votes
2answers
97 views

How to tell monocrystalline from polycrystalline solar panels

This is a very simple question, but I haven't found the answer yet. It seems to me that monocrystalline panels are always black (though I have seen some dark blue ones), and polycrystalline panels are ...
0
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0answers
56 views

Solar panel behind a dot matrix screen

I'm wondering if there is any kind of dot matrix screen (LCD, Eink, etc) that doesn't use a backlight (it's ambient-lit like wristwatch LCDs) and has a built-in PV panel behind the screen. I realize ...
0
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0answers
38 views

To use several regulators or one when using different solarpanels in parallel

What is the most efficient solar panel setup for a 12V vehicle system when using MPPT (multi-power-point-tracking) regulator(s) using PWM (pulse width modulating) regulator(s) In the following ...
1
vote
1answer
75 views

Solar with dual battery setup - keeping both charged?

My setup in my motorhome is 240W solar panels connected to 200Amp Hour house battery through an MPPT solar controller. The starting battery in the cab has a constant current draw around 200mA, ...
0
votes
0answers
86 views

Is reduction of amperage necessary in a battery charger?

I am quite a newbie when it comes to electronics; I am trying to make some of my garden lights use solar power. I have bought two small solar panels and one solar controller and I already have a ...
3
votes
1answer
139 views

Reasonable CPU power usage for solar panel powered system with battery

I am building a system using an embedded board that appears to use about 1/4 to 1/3 AMP according to my bench power supply. Is this low enough power consumption for this system to be run off of some ...
6
votes
2answers
238 views

Is electricity wasted when energy generated by power plant is not in immediate demand?

After my second series physics course I have begin to wonder how power plants control energy production to match the usage of a city. There are several possible answers in my mind listed below: ...
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1answer
204 views

How to convert a 10-Watt solar panel into 3v & 3 amp?

The device I use requires about 3V and 3 amps. Based on my Google research, I found out that in order to get 3V and 3 amps from a solar panel, the solar panel needs to be at least 9 watts. So let's ...
1
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1answer
137 views

How to use a solar panel that has 'watts' to power a battery charger that requires: 3v & 2.8 amps?

I have a battery charger that charges small batteries ( AAA & AA ). It uses an adapter that gives it 3V and 2.8 amps. I want to remove the adapter and give it solar energy instead. There are ...
0
votes
0answers
100 views

Can I connect a plug-in 12V battery charger to a battery in a solar charging system while the battery is connected to the solar controller?

I have put together a small solar post light system with a 35W panel, a sealed lead acid battery and an LED load. I attempted to size the system appropriately, calculating draw , average charging ...
0
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1answer
263 views

Different voltage solar panels in parallel

I'm using a solar panel to power an Arduino + a LiPo battery charger. I'd like to increase the amount of current at the same voltage, so would like to wire up a second solar panel in parallel to the ...
3
votes
1answer
510 views

Charging 12v batteries with direct connection to 20v solar panels

I want to charge a 12v Sealed Lead Acid car battery off of a solar panel (20v) and then draw about 10-20W of power from it via an inverter (the load). I'm wondering if its okay to connect it ...