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

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1answer
26 views

How to pick a rechargeable battery?

I need a rechargeable battery that can produce about 10 Wh per day. In a day this battery/ies should produce 281 mA for about 15 s, 265 mA for about 30 min, and about 131 mA for the rest of the day. ...
0
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1answer
39 views

Differences Between Buck-Converter and Linear Current Booster

Thinking through a design that interfaces a solar panel to a 12V diaphragm pump, and considering the interfacing options. I've come across the term "Linear Current Booster", and wanted to explore ...
2
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0answers
49 views

Design a circuit for rechargeable batteries supplied by a solar panel and generator?

I want to design a circuit for a rechargeable battery (or batteries) that can be charged by both a solar panel and a generator. I am working on the same project as described here, but my focus is on ...
0
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0answers
53 views

Concerns About Solar Charging Tree House Lights

I'm Building a lighting system for my tree house with 4 LED work lights I picked up at the hardware store. I want it to have solar charging and be operable via one switch. Theres alot of background so ...
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2answers
86 views

Power-Supply “Combination”: Solar for voltage + Battery for current

I'm rather new to circuits & DIY electronics, but am thoroughly enjoying tinkering with my new RaspberryPi and assorted components. I'm trying to power the device using a few simple solar panels I ...
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0answers
33 views

Dual power sources to 12V batteries in MPPT solar setup? [closed]

I have 12V batteries charged by a 1KW 60V solar panel array. The system uses an 80Amp MPPT solar charge controller. I would like to add a secondary power source - possibly a 12V peltier based ...
0
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1answer
45 views

Solar panel charging battery loss over night from leakage current

I am setting up a solar panel to charge a 12 VDC lead/acid battery to run a trolling motor for my dinghy. Does anyone have an idea as to how much leakage current there is through a 12VDC 8.5W panel ...
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2answers
68 views

using a capacitor for an off-grid system

New to the side and have very little knowledge on electrical systems. I'm trying to come up with a good off-grid system for my small house and have the idea of a PV array with a battery bank, charge ...
0
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2answers
57 views

Solar panels at night without diodes - short circuit or source of power dissipation?

So the title pretty much sums it up. I have a circuit that has a solar panel and some other power sources and I am to do a circuit analysis when there is no sun and show how it affects the system. ...
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0answers
53 views

Solar project design - solar-panel, battery bank and charge controller

For a project that has following requirements, can someone please explain how I can arrive at the size of solar panel and battery bank that meets the requirement: Scenario-1: 5VDC, 4A continuous ...
0
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1answer
95 views

Capacitor Charging

Just a quick question, because i want to know if its possible. My son asked me if a kind of light harvesting robot could be made. That roams around, finds light, then charges, then runs around ...
0
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1answer
61 views

Adafruit Trinket Solar Power

I'm curious if anyone has experience with getting a simple board like the Adafruit Trinket or DigiSpark or any of the other ATTiny based clone boards running on solar power. E.g. with a solar panel ...
0
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1answer
42 views

What is the theoretical minimum size of solar cells on wrist watches? [closed]

I was wondering what is the theoretical minimum amount of surface area in solar cells one would need to power an analog display wrist watch assuming the following scenario: The watch's face has a ...
0
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1answer
77 views

Powering a rechargeable battery with a solar cell

just a short question. I have a solar cell that outputs 7V. I want it to charge a 9V battery source. Is there anything I should be worried about or take note if I try to do this?
0
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1answer
36 views

“Ultimate” Surge Protector with Solar Cells

I've had an idea that I was wondering if it would be possible. I came up with this idea when thinking about local computer backups. Companies such as IoSafe make hard drives which are water & ...
1
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2answers
42 views

Solar panels for a DC solar pool pump

Ok - total newbie question here. I'm trying to work out the size or number of solar panels required to run a DC pump for use as a solar heating system for a swimming pool. I've located what looks ...
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1answer
92 views

Photovoltaic cell used in calculators

I wish to make a PV powered (and battery backed) LCD clock. From what I understand my requirement may be served by a PV (photovoltaic) cell that provides similar or superior functionality to those ...
2
votes
2answers
63 views

Solar charging circuit question

Here we have a limiter circuit, pinned to 2.75V. There are 2 AAA batteries on the right and a 5V solar panel on the left. There is a sensor to determine when the circuit is on or off at P0.6 ...
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0answers
52 views

Taking a 3V solar panel to charge a 3.8V LiPo Battery using step up converter

I am trying to make a self sustaining system that uses a solar panel and LiPo battery. The LiPo battery is a standard 3.8V battery with recommended charging at 4.2V. I have a solar panel that has ...
0
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1answer
69 views

SIM908 Li-Ion charging with 6V solar panel

So, I want to know if I can hook up a 6V 2 watt solar panel to the Vchg pin on a SIM908 gsm/gps module and trickle charge my 6Ah LiPo battery that way. A little background... So, I have completed ...
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2answers
43 views

How much power is generated from a typical solar-powered watch?

I have an ABC watch from Casio that is also an altimeter, barometer, and compass. I'm fascinated that all these features are powered by solar, which makes me curious: How much power is generated from ...
4
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1answer
111 views

How does this DC/DC converter work

I've got my hands on a bunch of old garden lights with solar panels, and of course I disassembled them and found that they use just one 1.5V accumulator cell to light up the LED. Just for ...
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0answers
46 views

Will the shading of Solar panels affects the output voltage?

Let's say many solar panels are connected in series and parallel. If a part of the solar array is shaded (due to a tree or a wall) it affects the output power of the cells. Given that it affects the ...
0
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1answer
137 views

How does battery charging work

I want to charge a 7.2V-2000mAh NiMH battery. I have many solar panels and a voltage regulator but I do not know what voltage is required to charge it. I've heard people say that as long as it is any ...
2
votes
2answers
436 views

How does a solar garden LED work with just 1 AAA battery?

I am converting some solar LED garden lights to emit infrared light for a raspberry pi critter camera to see what kind of wildlife trifles through my garbage at night. I just have one question. ...
0
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1answer
35 views

Replace a Solar Panel with a charging brick

I have a small solar lamp with a messed up solar panel. Now i want to replace the solar panel with a charging brick in order to charge my lamp. The question is what specification of charging brick ...
0
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1answer
48 views

Dropped Bluetooth Connection While Charging through Solar

  I am trying to charge a device (not of my own invention) with a solar panel. Sorry for the lack of name, but I’d like to keep my project my project. The panel is rated for 4.8v at 100 mA, and the ...
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1answer
39 views

Solar cells, current limited by smallest cell?

I've read on a bunch of different sites that: "You also do not want to mix different sized cells together because the current or AMPS of your solar panel will be limited by the smallest cell in the ...
0
votes
1answer
59 views

How to improve the current when the voltage is high in solar cell?

I am doing research on the fabrication of natural dye sensitized solar cells. The electrodes were imported . The dye was prepared from fruits and leaves using DMSO as solvent and KI and I2 in ...
3
votes
3answers
117 views

Is this the proper way to fuse a DC/DC Converter?

I am designing a solar power system for camping. I'll use a couple different DC/DC converters to provide DC voltages for the specific items I want to power. I want to properly fuse the various ...
0
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2answers
77 views

Solar Panel Cellphone Charger - Not Enough Current?

The Materials : 1) 3 X 1.5W 6V Monocrystalline panels @ 320mA 2) DC-DC Variable Voltage regulator 3) 3 X 1N4001 Diodes The Problem : - I have connected the panels (which give about 203 mA ...
0
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0answers
44 views

Designing a Solar Diorama with Motor and LED Indicator

I'm trying to design a Solar Diorama that uses Solar PV panels to power a small spinning motor and an LED indicator light that will show the current amount of power. Motor: 12 Volt DC, 2.1 Amps, 25.2 ...
0
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0answers
72 views

440AH 12V Lead Acid batteries discharging too quickly?

I've got 4 x 110AH 12V Orange Juice Trust brand Lead acid batteries connected in parallel to 1000 Watts of solar panels. The batteries are about 6 months old. According to the readings on my MPPT ...
0
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1answer
84 views

Running a load off a solar panel connected to 2x 12V batteries.

I am having trouble figuring out what relay I should be using for my solar panel set up. I have a solar panel running to a solar charge controller. I then have the controller running into a relay. ...
0
votes
1answer
96 views

lm2596 fixed 5 volts(usb) from 12v 10W solar panel

I have got a 10 Watt solar panel & a 10000 mha Battery bank. I plan to use the panel to charge the battery bank. I have a LM2596(variable configuration with pot), I plan to use it to charge my ...
0
votes
1answer
79 views

Questions concerning Solar MPPT tracker

I am building a solar MPPT tracker. First of all: what I understood from MPPT is that MPPT units transfer the maximum power available from a solar panel at that time to the load. This can be done by ...
1
vote
1answer
130 views

About a solar cell phone charger

I recently made a solar charger. The output energy of solar cell is 2 Watts. The voltage is around 20 volts. I used 7805 IC voltage regulator so i could get around 5V. I used a female USB and ...
0
votes
1answer
79 views

Am I misunderstanding the specs of this solar panel or electric motor?

I've been trying to figure this out, but the answers I've come up with thus far have been counter-intuitive. The solar panel's specs are as follows: ...
0
votes
1answer
421 views

Solar panel and 120mm Computer fan

Just before I start description my question, I would like to let you know that I am new at this. I am working on a solar air heater for one of my window. I've been researching and reading up on a lot ...
1
vote
2answers
130 views

Determining a solar panel, is this correct?

I want to power this device, which is a tplink wr703n. It is a small travel router. When I looked at the specs, it says that it uses 100mA for wifi, and 85mA to run it. This is incredibly low. Now, ...
0
votes
2answers
106 views

Solar inverter with mains backup [closed]

I'm looking for a way to partially power an applicance (a fridge freezer for argument's sake) using solar/renewable energy. I don't expect the couple of hundred watts of solar power to be sufficient ...
0
votes
1answer
105 views

Is it okay to put a solar cell and battery into resin?

I was thinking about making a simple circuit with LED, solar cell and battery and put it in resin mold to make it weather proof. I wonder is there anything wrong (chemically) with putting a battery ...
-1
votes
2answers
121 views

Issue charging a 12V battery using solar charger

I bought a 12V solar charger for vehicle batteries, because I am usually using wall chargers and I wanted to give green technology a try. When I connect the solar charger to my battery, it shows 10V, ...
0
votes
1answer
72 views

Power supply for Raspberry Pi

Before you tell me that the question has already been asked, only similar things have been asked. I need to power a Raspberry Pi with some electrical equipment attached to it. The Pi needs to run ...
0
votes
1answer
95 views

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

I have six solar panels but each are different from one another. The first is 4.5V. The second is 6V. And the last four are all equal up to 6V. It all adds up to 16.5V in series or on a good sunny ...
0
votes
1answer
61 views

Battery recharging via solar panel

I am trying to use rechargeable batteries. If I recharge two of the below batteries via the solar panel below, how many hours will it need to recharge to 100%? Likewise, what if I recharge four ...
1
vote
1answer
84 views

Will this be able to run 24/7? [closed]

I'm trying to find out if I can run an appliance of mine can off the grid, completely on solar power and a battery. The appliance uses 4.91 amps and uses 110 volts on the power cord. The solar panel ...
0
votes
2answers
238 views

DIY 5v Solar Panels

In a nutshell : What is a good way to power a 5V project with one-two 0.5 V solar cells? The motivation is as follows: My project needs about 2.5-5 Watts from the solar panel. Also, this project ...
0
votes
2answers
85 views

Solar panel system with as minimal reliance on the grid

I am not sure if this is the best place to ask, but I am trying to make a solar panel system which will charge batteries with excess energy and will be connected to the mains (i am going to try the ...
2
votes
2answers
344 views

Solar power monitoring with Raspberry Pi

I want to measure the current and voltage from a set of small solar panels (about 10V and 100mA but not settled yet) using a Raspberry Pi. There will be between 4 and 6 panels. This project will ...