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

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29 views

Questions on RC Truck/Arduino/Endurance [on hold]

I've googled, and searched - nothing too related to my question. I appreciate any help. I want to get an RC Truck (1/18 scale) or something to use as a Chassis - and control via Arduino/Bluetooth. My ...
1
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3answers
54 views

Switching between two sources of power to a battery?

This is the simplified system: a battery (3.6 V, 2450 mAH, NiMH) a solar panel (max 5.2 V, 157 mA) a wall charger (5 V, 2100 mA). The battery is constantly being drained, but very slowly (85 mWh ...
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1answer
33 views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
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1answer
35 views

IC for Trickle Charging vs. Fast Charging a NiMH rechargeable battery using solar and wall charger?

I want to use a solar panel to extend the use time of 3 NiMH AA's in series to power a microcontroller. The solar panel is rated at 1 W with a max load voltage of 6.4 V and the product page is here. ...
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1answer
21 views

Appropriate fuse for 12V battery - solar power controller connection

I'm a biologist tracking migratory bats and need to build a bunch of antenna towers to listen for pulses from tagged bats flying nearby. These are off-grid, so we'll have 55W solar panels charging ...
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3answers
70 views

Open circuit volts and short circuit amps

I am looking to buy a few solar cells to mess around and learn with and I don't understand what exactly this part in the description is telling me: "...offering 4.5V (open circuit) and 18mA (short ...
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0answers
46 views

Solar panel - voltage regulator

I am contemplating the possibility to run a trolling motor (to push my canoe) with a 250W solar panel. Electrical Specifications: Peak power: 250 W (minus 0, plus 5W Tolerance!) Optimum operating ...
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1answer
38 views

Current output of a solar panel when connected to battery and load

I am trying to build a microgrid (final year project) where a 100-250 W 48V solar array will charge a 24V battery bank and a couple of 24V loads (40W lights, 60W fan). Batteries used (7 of this in ...
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1answer
36 views

Shared Voltmeter for 2 DC Circuits at Different Voltages (battery & solar)

I want to use one panel mount voltmeter (Powerwerx PanelDVM) for measuring both my 12VDC Battery output and the input voltage from a Solar panel ,which has a higher DC Voltage. This all is hooked to a ...
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1answer
55 views

12v lead acid battery charged directly by 17v solar panel

I don't have a charge controller, I wanna know if I can directly connect the solar panel (17v max when directly hit by sun light 1.5W) to the 12v battery? Someone in arduino group on facebook said ...
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2answers
83 views

How do I combine multiple A/C and D/C power sources into one electrical system? [closed]

I'm looking to design an off-grid power system for my house. I'm a complete novice at this point but I'm willing to do a lot of reading to complete the project. There is a lot I still don't yet know ...
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2answers
52 views

create a interruption-proof power

I need to create a interruption-proof power for a project of mine, very similar to the design of this link. My problem is that I need to adjust the current delivered of the solar panel (21V, 1.2A) to ...
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1answer
140 views

Solar controller with BJT transistor and PIC24 microcontroller to charge 3.6V NiMH batteries

I'm designing a solar controller circuit and am having some confusion about how to switch the BJT on and off. I have a single solar panel charging a battery. The BJT is there to prevent over-charging ...
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3answers
112 views

How to autoregulate a TP4056 for maximum solar power extraction

I'm using a solar panel (6V - 600mA at peak power) to charge a Li-Ion (3.7V) battery using a TP4065. The TP4065 I'm using has this configuration: Where the value of the resistor Rprog determines ...
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1answer
85 views

How long will my battery last under this load and with this source?

I need to calculate how long my battery will last until it is completely discharged. I have a load that will draw 154 uA at 1.8 V for a power of 277.2 mW. Assuming that this is running indefinitely ...
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2answers
79 views

Charging a battery with two sources, should I put them in series or parallel?

I would like to charge a battery using two sources (solar and a generator), should I put the two sources in series or parallel before the battery? The battery is actually 3 batteries in series. Each ...
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0answers
77 views

Solar charge controller circuit for LiFePO4 (or possibly NiMH batteries)

Would someone happen to know of a circuit board for charging LiFePO4 batteries from solar panels. Or alternatively a simple circuit schematic for building one? I would like to use 2 LiFePO4 ...
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0answers
21 views

solar charge while driving on alternator

Can a MPPT solar regulator effect a cars computer or alternator while driving? My scenario is this. - 2xAGM batts in a 4x4 with a smart VSR (voltage sensing relay) isolator (which closes at 13.2V ...
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1answer
36 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
58 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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1answer
102 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 ...
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0answers
67 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
109 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 ...
0
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1answer
53 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
79 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 ...
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2answers
59 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
75 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
105 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 ...
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1answer
83 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
47 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 ...
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1answer
82 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?
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1answer
39 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 & ...
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2answers
51 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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votes
1answer
96 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
71 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
82 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
110 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
47 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
votes
1answer
115 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
51 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
151 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
487 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
51 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 ...
0
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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
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1answer
60 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
125 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
85 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 ...
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0answers
46 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
95 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 ...