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

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32 views

Convert 3v solar cell to 1.5v

I recently bought a solar cell rated at 3v and 200mA dc to power a 1.5v dc motor that is used as an air pump for my aquarium.All the 1.5v solar cells available here have low ampere like 50mA or so. ...
0
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1answer
14 views

Current and voltage from PV ( LTS25NP , LV 25-P)

So in my design I am going to sense two PV panels in series ( Both voltage and current) to extract the Maximum power point (MPPT by arduino) so the input of both sensors will be the PV output and the ...
0
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1answer
43 views

Usb input current requirements for a power bank

My project is to take solar power from a 6w/6v panel, run it through a buck circuit tuned to 5v and charge one of the LiPo power banks. I perceive a buck circuit would do better at efficiency than a ...
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1answer
40 views

Solar charging using or not using a dummy (dump) load

I'm in the process of designing a small solar regulator / charger (no more than 5A) for sealed lead acid batteries. I have put a working prototype together and all seems to be working. However, ...
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0answers
13 views

Solar charging voltage [closed]

I need to get a portable solar panel for few of my devices while camping. The problems is that with this variety of needs I'm not sure which one to choose. Here is what I need to charge: marine ...
1
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1answer
70 views

What do I need to trickle charge rechargable batteries with a solar panel

Hi I have a chicken coop door opener that is battery operated. The batteries tend to run down every other month even though the thing is basically just a digital alarm clock with a stepper motor ...
0
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1answer
18 views

battery charging on solar panel

I have a single solar panel of 40 amps and I want to charge 12 volt 40 amp battery. How many such batteries can I charge on this single solar panel, and should I connect more batteries in parallel or ...
4
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2answers
67 views

Heating a li-ion battery for use in sub-zero temperatures

I have a design that I'm working on that is to be outdoors year round, with a 1 watt solar panel trickle charging a 6 Ah li-ion battery during the day. I expect there to be about 3 to 4 months of ...
0
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1answer
26 views

Computing Power Requirement For Solar Setup

In relation to this question: Solar power wattage requirement I'm trying to get to the math of understanding my wattage for my plan solar-setup. I would like anyone here who knew can correct me on my ...
0
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1answer
29 views

Solar: Reason For Joining Batteries/Solar Panels in Series

I understand the concept of what happens when you do, but I do not understand the reason behind why some set-up require to double the voltage on the batteries, since the point is to store as much AH ...
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2answers
28 views

Understanding Battery Controller

I'm thinking of doing a small-scale Solar off-grid setup 1-2 80 Watt panels with a 12v 40Ah Deep Cycle battery. I have questions for those parts in another thread, but for now, my question is about ...
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2answers
32 views

How could I power flexible oled screens with wearable power source and could I transmit data onto it with bluetooth via app [closed]

How could I power flexible oled screens with solar power and could I transmit data onto it with bluetooth via app? Would this be possible? please can you help thank you
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2answers
83 views

How to keep solar panel voltage at 24V?

I purchased a "24v" solar panel thinking it would output only at 24v, or less if there wasn't enough light. Immediately tested it, in indirect light it's producing 38V. Checked the label on the back ...
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0answers
46 views

Running my camper on solar [migrated]

I would lIke to run my camper fully on solar and I'm unsure what I would need to do it right. It would be for heavy use, lights, appliances, tv, ect... I have a 2014 camper that has a 50 amp plug on ...
0
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1answer
41 views

USB charger with power bank charged from solar panel and peltiers

I would like to charge some batteries (maybe 1 lipo?) from either a 12V solar panel (about 300mA) or 2 peltiers (also about 200-300mA) in series (about 4V, but it’s really unstable and voltage changes ...
1
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1answer
42 views

MP3-25 flexible solar panel providing low current

I am working on a project where I need about 20 mA to come from a particular solar panel I am in possession of. The solar panel is an MP3-25 panel, I actually have 2 which I am trying to get to work. ...
0
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1answer
41 views

how to calculate solar panel size needed to run circuit

Iam doing a project and want to calculate what size solar panel to use to run my circuit. the only thing is that I have some size constraints involved cant be bigger and \$5\times5\$ in. I have a ...
0
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1answer
48 views

DIY power 230v filament bulb off grid [closed]

I need to power a 230v bulb off the grid via solar power. Typically, I would have solar panels that charges some 12v dry/wet cells. These cells will have to supply an inverter that would power the ...
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3answers
64 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
54 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 ...
0
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1answer
60 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
41 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
73 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
53 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 ...
0
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1answer
60 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
50 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
102 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 ...
5
votes
2answers
112 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 ...
0
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2answers
56 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 ...
1
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1answer
184 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 ...
1
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3answers
233 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 ...
0
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1answer
127 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 ...
0
votes
2answers
128 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 ...
0
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0answers
130 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 ...
1
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0answers
26 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 ...
0
votes
1answer
38 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
75 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
votes
1answer
154 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
75 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 ...
1
vote
2answers
127 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
votes
1answer
64 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 ...
1
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3answers
106 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
votes
2answers
63 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. ...
0
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0answers
94 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
votes
1answer
121 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
109 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
54 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
83 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
43 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
65 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 ...