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
0answers
27 views

Automatically changing currently used and charged deep cycle batteries, any problem?

I don't know the internals of commercial solar deep cycle battery chargers, though mostly what I see in home made ones is that a regulator circuit is connected to battery, and when you want to use the ...
0
votes
0answers
32 views

Disconnect PV string from inverter and connect to charge controller on grid failure

I'm designing a PV system where a string of panels is connected to a normal grid tied inverter, but when the grid fails, I want to switch the string to feed a charge controller that will top off a ...
1
vote
2answers
46 views

Solar array not charging batteries

I just installed a solar array to charge an existing battery system. Even with full sun my charge controller is not receiving enough voltage to go into charge mode. All the system info is below. ...
0
votes
2answers
89 views

What wattage solar panel required for AC 1000 watts

If my house load is 1000 Watts AC/220V, then 1000 Watts DC/12V solar panels is not enough. What wattage solar panel would be required for AC 1000 watts?
0
votes
0answers
21 views

Solar charger under rapidly varying conditions/impendance

My solar equipment consists of: Solar panel capable of: 20V Peak / 3.6A Peak Li-Ion Battery pack: 8.7V, 9Ah, (2S3P setup) My solar charger setup consists of: 5A DC-DC BUCK converter (XL4015) ...
1
vote
3answers
447 views

How many Watts DC are equivalent to 1,000 Watts AC? [duplicate]

How many Watts DC are equivalent to 1,000 Watts AC? For instance, my load in AC is 1,000 Watts 220V. Then, how much DC watts would an equivalent load dissipate in 12V or 24V DC system?
1
vote
2answers
97 views

How can I seamlessly switch power supplies?

Quick question, I am not very good with my electrical circuit terminology so I'm not sure what to call what I'm trying to do. When I try to Google "How to switch power supplies" I got inundated with ...
0
votes
0answers
26 views

Designing an Automated Switching System for Solar Battery Charging Station

I am trying to design an Automated Switching System for my Solar Battery Charging Station project. In the project a 48V battery rail is charged with two 200W panels connected in series through a PWM ...
0
votes
2answers
53 views

Solar panel calculation

I have a small solar panel of the following, Area = 0.0078 square meter Rated Power = 1 W Now, I am interested to calculated the total energy this solar panel can harvest over a day. I am taking ...
6
votes
5answers
854 views

Extract 5W low voltage power from 3000W high voltage source

I have a solarpanel array that generates 600V, 5A (3kW). I want to create a small electronic unit to measure the DC current and voltage and transmit this wireless. For this I have an electronic board ...
1
vote
2answers
81 views

Watts in Solar Panels

How does the amount of watts affect a solar array? The solar array I found is 14 W, so what would I encounter if I purchased an lower/higher wattage? I'm going to purchase an array to charge my ...
-1
votes
0answers
48 views

Would this be too inefficient to be viable (inductive charging)

So I wound up with a handful of miniature solar cells from a botched project and I was playing around with them. I happened to notice that three put side by side fit almost perfectly into an indention ...
0
votes
1answer
64 views

How can I modify the charging circuit of the solar powered system using super-capacitor with or without battery (diagram is attached)?

I 'm working on a device which according to the below diagram, has a solar panel witch gives at most 10v voltage and 30mA current (average 9v and 20mA) and also it has a 6v lead acid dry battery with ...
0
votes
1answer
51 views

Solar panel & battery math verification

I'm looking for confirmation to see if this battery and this solar panel will cover my needs for a remote timelapse project I'm setting up. The timelapse will run 6 days a week for 9 hours. My area ...
1
vote
1answer
57 views

Efficient power utilization by MPPT battery charger

I am designing an MPPT solar charge controller to get more efficiency out of my system. At the moment I am at the conceptual stage and I have some questions about MPPT battery charging in general. ...
1
vote
1answer
42 views

How to monitor produced energy?

I want to monitor energy produced by 250W solar panel. But I need some hints. Does anyone knows something? Is it possible using ACS758 chip or better I have to use current transformator? Finally I ...
0
votes
0answers
23 views

Battery Charge Regulation Application

I'm building a switched mode power supply unit to take electrical energy generated by solar panels and store it inside a Lithium Ion battery pack. Some specifications: 1. The solar panel open circuit ...
2
votes
1answer
197 views

Can a low current (low power) solar panel charge a battery?

I have a solar panel that provides max 7V and average 5.5V under the sun. But it cannot produce enough current even for a little 3V DC motor. Can this solar panel charge a 3V battery? Or maybe two 3V ...
1
vote
2answers
77 views

AAA batteries solar charging help needed

I have a project running on 2 regular AAA batteries, I'd like to convert it to NiMH or NiCd rechargable batteries using solar power. I wanna use a panel like this: ...
0
votes
1answer
50 views

How to set up a LiPo battery to be able to charge and discharge from the same circuit

I am new to using rechargeable batteries in electronics projects. To give some background on the context of the project, I'm trying to build a solar charger/power pack for a cell phone. My problem is ...
2
votes
1answer
73 views

What kind of solar panel is required to keep a mobile alive forever?

I want to build a webcam from an old mobile and I want it to be solar powered. The phone use a 3.7V lithium-ion battery of 1500mAh capacity. The phone last 24h hours on one charge. So if I'm right, ...
2
votes
2answers
127 views

Effects of continous slow charge on a battery?

If you connect a solar panel to a phone battery, but the solar panel provides about 1/4 (or 25%) of charge (mA) compared to the battery's original charger. Will this slow power charge the battery ...
0
votes
3answers
102 views

12V fan does not work when in parallel but does in series

I am building a food cooler for camping this summer. My plan is to build a thermoelectric cooler that is solar powered. My cooler is looking much like this: including a CPU fan on the hot side and ...
0
votes
4answers
74 views

Calculation of PV daily energy yield

How can you calculate how much energy a PV panel (known size and wattage) produces in a day given the exact insolation in kWh/m2/day?
1
vote
0answers
58 views

DIY buck-boost converter clarifications and research review

I want to make my own buck-boost converter! After watching this video, I got a basic understanding on how it works, and I made some analysis on this scheme: simulate this circuit – ...
0
votes
0answers
47 views

Photovoltaic Panel Power On a PC Fan

I've built a simple circuit with a 3V solar panel, an LT 1301 to step up the 3V of the solar panel to the 12V needed to start my 8cm PC fan and obviously, the 8cm fan. Everything works fine, but in ...
2
votes
2answers
138 views

Considerations for solar powered thermoelectric cooler with fan

I am building a food cooler for camping this summer. My plan is to build a thermoelectric cooler that is solar powered. My cooler is looking much like this: including a CPU fan on the hot side ...
0
votes
2answers
76 views

Regarding miniature solar panels

I am a bit confused. I want to buy a miniature solar panel like this. The problem is that all the miniature solar panels online in their specifications they give the peak voltage and peak current. ...
1
vote
3answers
63 views

Standard doping concentrations for Si and GaAs Solar Cell (as well as other standard values)

I am doing a MATLAB project where I need to plot the current of a Silicon and GaAs Solar Cell under Air Mass 0 and Air Mass 1 conditions. I have used solar irradiance data to calculate their ...
1
vote
0answers
49 views

Rechargeable battery with a photovoltaic switch

I did some searching around on the forum but with absolutely no electrical background, I have exhausted my searching and hope I can explain my issue. What am I trying to do? I have a solar panel and ...
5
votes
2answers
274 views

Why don't solar cells produce visible light when supplied with electricity?

... A cursory Google search didn't reveal an answer... Is the energy conversion a one-way process?
0
votes
1answer
47 views

Connecting solar panel and batteries of different voltages in series

Will this work? What I want to do is connect a 12v alternator to a battery to charge it which would then be wired in series with a 24v solar panel, but hopefully isolating the voltage. Will this work? ...
1
vote
1answer
70 views

Are disconnected PV panels damaged when exposed to sunlight?

Can PV solar panels be exposed to sun without being connected to controller and batteries? Have fixed panels on RV, and would like ability to switch (at controller input) to moveable panels on ground ...
0
votes
1answer
59 views

Efficient high amplitude current regulation, so I don't end up being sad

I have an unstable power source 0-10V (I don't actually know if it can drop to 0) from solar panels and I want to boost and stabilize it to charge 19V 2.1A laptop and a 12V 12Ah battery. I've already ...
0
votes
1answer
82 views

Trying to figure out how to solar power an embedded device

I have an Arndale octa board which itself needs 5V 3A power supply. Then I have four (4x) DC 5V motors and a 5V servo, and a number of other peripheals. So I think 5V 5A is safe to assume? I want ...
2
votes
1answer
57 views

Question about current output of a DC-DC stepdown converter

If we have a solar panel of 5V and we want to keep voltage on the output to 3V, what current we are getting on the output? The same as in the input? Or a different one?
0
votes
4answers
266 views

Why does my DIY “solar panel circuit” show battery voltage and not solar panel voltage?

I've got two solar panels set up in series as shown on the below schema. I connect positive on panel A to positive on battery, and negative on panel B to negative on battery. The two panels produce 9V ...
0
votes
3answers
88 views

How do I connect two solar panels in series?

I've got two solar panels which each provide 9V. I need them to provide 18V, and according to different sources (such as this forum thread) that should simply be a matter of connecting them in series. ...
2
votes
2answers
110 views

How to store the electric energy produced by solar panels properly?

I am building some solar panels from 6" cells (4W, 0.5V, 8A). At the moment I have two 1x2 panels and one 2x2 panel. So there are 8 cells in all panels and the added voltage is up to 4V. Now I want ...
0
votes
0answers
50 views

How hard would it be to make this? “Solar powered heater monitor”

I have a pump in a small underground opening, in winter it gets too cold for the pump to pump (frozen water). So I want to put a solar panel, a electric heating coil, a battery, a thermometer, and a ...
0
votes
2answers
58 views

Ordering Custom Solar Panel Size

I am currently involved in a photovoltaic systems engineering project at the University of Calgary and I am interested in purchasing around 30 solar panels of an irregular rhombus size: Does anyone ...
0
votes
3answers
86 views

Calculating Solar Requirements for a Refrigerator

I am attempting to run a refrigerator on solar power, it's "Energy Guide" says 410 kWh/year, so I assumed that it uses 46 W each hour (410 kWh / number of hours per year = 410 kWh / 8760 = 46 W), I ...
0
votes
1answer
63 views

Calculating Battery required for solar powered motor

I have a 220v/50Hz/420w motor, I'm planning to use the simple design Solar Panel --> Charge Controller --> Inverter --> Motor and i calculate battery requirements as follows: P = I * V, 420 = I * ...
2
votes
1answer
66 views

Options for solar rechargeable battery powering LEDs?

As part of my practice I make paintings and drawings with embedded LEDs controlled by an Arduino clone and LED driver. I showed 10 new pieces during an exhibit recently and had great feedback but ...
1
vote
2answers
80 views

Charging 12V SLA from Single Solar Cell

I'm interested in charging a 12V Sealed Lead-Acid battery from a single monocrystalline solar cell. The solar cell's voltage is only 0.5V at maximum power point, but it supplies 8A. I will need a 32X ...
4
votes
2answers
605 views

Reducing 12V to 5V

DISCLAIMER: I know nothing of electrical engineering I just seen this as the best fit category for my question. I have a solar panel that is being run to a controller switch (for lack of a better ...
3
votes
2answers
383 views

How do I avoid overcharging a battery?

I've got a solar panel (12V, 330mA, 2W) which I will use to charge a (12V 5Ah) lead acid battery. I'll put a voltage regulator and shottky diode in between the two. However, could overcharging become ...
0
votes
0answers
23 views

Can bad Bypass diodes in solar panels cause drop in amperage? [duplicate]

I had 6 panels at home they worked well for a few days but today the amperage dropped suddenly the voltage is proper but can't get the right amperage from cells can a bad bypass diode cause this ...
0
votes
3answers
153 views

Solar Panel used in Conjunction with a DC to DC Step Up

Good morning all, I am trying to put a little project together where I used a 1 watt, 6v solar panel in conjunction with a 0.9V - 5V to 5V DC to DC boost converter. I hooked up the solar panel to a ...
0
votes
2answers
101 views

How do I get 12V 260mAh from 4x 6V 130mAh solar cell panels?

I'm trying to figure out how to build a DIY micro irrigation system for my small greenhouse. A part of that task is to figure out how I can charge 8 AA batteries using solar panels. I've found a set ...