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

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1
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1answer
35 views

Which battery to use to charge from 12v solar and supply raspberry pi [on hold]

I'd like to run my raspberry pi via solar energy. I have a 12v 20w solar panel with the following charge controller: ...
0
votes
0answers
25 views

Voltage stepdown spikes in solar power system during night time

Intro: I have a personal weather station out in the mountains, so going out everyday to fix things is difficult, and it runs on solar power. I have a pro star charge controller, which has low and high ...
0
votes
0answers
16 views

How to decrease the absorption voltage in the case of an MPPT with fixed settings

I have an MPPT solar charge controller which doesn't have any option to input the custom settings. Though it works fine for new batteries but as my battery, Flooded Lead Acid 150AH, is little old and ...
1
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3answers
86 views

solar panels in parallel

I am connecting 7 solar cells, the data or info shown below - simulate this circuit – Schematic created using CircuitLab The above schematic is how I am rigging up my solar cells. ...
0
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1answer
40 views

One battery discharges faster than the other in my solar power system

So, I have solar power system and it is as follows: 2 AGM batteries each 100 Ah 2 solar panels 24-Volt , 250 Watts each a controller an inverter the batteries are connected in series to give a ...
1
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2answers
46 views

charge 5v battery with 12v solar panel

I've a 5v 2200mAH battery and a 12v solar panel and charge controller. Is there any danger in charger my battery from the 12v panel/controller? The batter will then power my raspberry pi zero ...
0
votes
4answers
81 views

Why aren't there electric cars with solar cells built on top of them? [closed]

I think it would be nice if leaving the car outside on a sunny day would charge up the batteries. It would make possible long-range weekend trips to the countryside because during the 2-3 days of ...
0
votes
1answer
53 views

Router WiFi with solar energy

I want to create a backup system for my WiFi router (photo). I've purchased a solar panel (12V, 80W) and a battery (12V, 30Ah). How long should my router last with a full battery? Is it possible ...
0
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0answers
21 views

How to prevent load over-voltage in a 12V solar charging system

I'm putting together a portable, 12V, 2A max, LiFePO4 power system for backpacking. The issue that I'm facing is that my solar charge controller of choice, which has panel, battery and load terminals, ...
3
votes
1answer
186 views

Key differences between solar-cells used for terrestrial and space applications

I'm looking for some of the key differences in materials for solar panels used in terrestrial vs. space-based applications. I have read the GaAs is common for space applications due to its relatively ...
0
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0answers
35 views

How to boost a small solar panel by a few volts?

I have a 4v solar panel, and I have load that takes 5v. So, how can I just increase the solar panel by 1 volt? Thanks.
-1
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1answer
33 views

How to reduce VOC of solar panels to match the MPPT of inverter

I will have an off grid solar panel system to run my deep well 5,5 Hp water pump. I already got 24 of 250Wp 36,3 Voc panels and 3 phase Delta VFD C2000 inverter/driver. for this system I need to wire ...
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votes
1answer
29 views

Voltage regulator needed for charging rechargeable battery via solar panel? [closed]

I want to charge a 12V rechargeable battery (3Ah) with my solar panel - link to eBay site. Do I need to add a voltage regulator to charge the battery? Would it destroy the battery without one?
0
votes
1answer
26 views

Solar MPPT charging circuit

I'm new to this solar stuff. I bought an 20W solar panel. I'm planning to upgrade to 100W. But the problem is I've searched about mppt systems and get bit of confused. So please correct me if I'm ...
1
vote
1answer
48 views

Power Arduino / Magnet valve with 12V solar panel

I bought the following solar panel: Link to eBay it has the following data: Max. Power: 10 W Open circuit voltage: 21 V Ideal operating voltage: 18 V Ideal operating current: 0,56 A Short-circuit ...
-2
votes
1answer
34 views

Which better charge method for 12v 10w solar panel to 2x 6v 4.5ah battery?

i have 12v 10w solar panel and 2 x 6v/4.5ah battery. Im planning to build control that charge 12v battery (in this i series 2x6v battery) and after i read this Do batteries in series equalize charge ...
1
vote
1answer
38 views

Charging series connected batteries independently

Just want to make sure this charging configuration will work. Basically we have two solar panels and two solar charge controllers independently charging one of the two series connected batteries ...
0
votes
1answer
38 views

Solar Cell functioning [closed]

I am confused about the operation of solar cell. Maybe its because i still did not quite understand the effect about the voltage drop across a solid state device. We operate in quadrant 4 where ...
0
votes
1answer
37 views

Low RPM, Low Power, Low Torque Motor (to be solar powered)

I am trying to build a small contraption/artwork to be mounted on a wall indoors. Ideally it will solely solar powered from a small solar panel (10cmx10cm). It needs to spin slowly anywhere between ...
0
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0answers
8 views

6v charge controller maximum input voltage and current

is it possible to calculate the maximum input voltage and current for a 6v 4.5AH battery charge controller, the source of power is a 6v 3w solar panel.
0
votes
1answer
35 views

charging batteries

I need some advice, I have 8 older Gould 3ETC7 (6V) batteries 22.5 amp 8 hrs, they have completely discharges but were kept in a basement. I have 200 w of solar 12v, and a 3000w inverter to be used ...
0
votes
2answers
78 views

Solar powered Arduino project

I have some ideas for Arduino Nano projects I'm throwing around that I would like to power only with a solar panel and I'm wondering if I am going about it the right way. I have: A 7.2V 100mA solar ...
1
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1answer
55 views

Difficulty in understanding charge controller for solar and wind energy

I am having difficulty in understanding one control box which is used to charge the battery using solar and wind energy as well as power the load at the same time. I have attached the picture below ...
0
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2answers
52 views

why does the negative lead to a solar panel go black,oxidise.?

I have an 40watt solar panel connected to a 12v battery via 6A twin flex. After 3 yrs the neg lead has gone from bright copper to black tarnished. Can anyone explain why this should be, cheers.
0
votes
1answer
59 views

Solar Motor Circuit Design

Trying to build a simple circuit to power a small pump while the sun is out. Here are the specifics: Solar Panel (60 cell mono panel) Open circuit voltage 36.4V DC, Short circuit current 7.96A. Pump ...
0
votes
0answers
20 views

solar power back to electric meter

I'm looking for a solar or turbine solution at home since ages, I'm only a tenant, though, so don't want to make massive investment and let it here when to move out. Probably not the right forum ...
1
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4answers
51 views

Should I multiply by time to determine Watt-hours?

I have done an experiment with solar panels over the course of the day to determine the total power output in Wh. I measured voltage and current through my solar panel circuit using a multimeter every ...
-4
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1answer
38 views

Recycling light using photovoltaic cell [closed]

Can you recycle light emitted via mobile using photovoltaic cell and feed it to the mobile.?
0
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2answers
30 views

Solar Irradiance levels for PV system [closed]

I have designed a PV system which like conventional systems has a Boost converter followed by an inverter. The output of 230V (AC) is achieved for irradiance of 1000 W/m2 to 600 W/m2. However, after ...
6
votes
8answers
1k views

Solving problem of long DC wires

DC current through a very long wire losses its first current, because the wire work as a resistor. This is the biggest problem when using DC appliances in solar home systems, because there is a very ...
0
votes
1answer
42 views

How to measure the voltage an appliance is actually drawing when connected to a solar panel?

Sine June last year I've been using a solar panel which claims to have a built in voltage regulator capping output at 18 volts DC, to charge Lithium-Polymer batteries that have an input range of 15V ...
0
votes
1answer
58 views

The “Miller” 1381 solar engine circuit problem

I was following the instructions on this page: solarbotics.net/library/circuits/se_t1_mse.html to try to build a "Miller" solar engine, using a solar panel generating ~4V to drive a small DC motor. ...
0
votes
1answer
160 views

Diagnosing potential damage to garden solar light

I'm just getting started with electronics and so for a simple project I tried to desolder the LED from a garden solar light in order to attach a female header (I trimmed it to 2 pins). My intention ...
3
votes
2answers
94 views

Different ways to detect seals? [closed]

I would like to build an underwater mammal detector to take videos of seals when they get in and out of their cave (the entrance of their cave is underwater). It will be a waterproof sealed box with ...
0
votes
1answer
37 views

Use a solar battery charging system to power day/night security camera?

I have in mind a wireless security camera but it still needs an AC adaper for power. I wish to supply this power from a 8 x 1.5v supply of 2,500 mAh batteries that are charged in daytime with 12 volt ...
0
votes
1answer
25 views

MPPT for fixed DC use, or charging multiple independant batteries at once?

I've got a set of small deep discharge lead acid batteries (7ah @ 12v) and a few larger ones that I use for running electronics in remote areas for hobby use. I don't use them evenly throughout the ...
0
votes
2answers
102 views

How to vary the voltage of a battery

Essentially, what I need to do is vary the output voltage of a battery between say 2V - 5V. This is to mimic the voltage output properties of a solar panel under different sunlight intensities. The ...
0
votes
2answers
82 views

Current amplifier for a solar panel

After performing some tests on a small sized solar panel, I have been able to determine that the panel outputs on average, around 6v (Open source voltage) 300mA (Short circuit current) with no load. ...
0
votes
1answer
62 views

Will this Solar-Electric hybrid circuit work?

Would the circuit above works? I'm trying to build a self sustaining solar powered Arduino controlled plant watering system. Since I'm using an electronic valve and not a pump, I'll assume it ...
0
votes
1answer
41 views

mixing two different types of solar panels with different wattage

I have two solar panels (( Poly-100w(5.6A) - Mono-50w(2.6A) )) both have a voltage PmaX of 17-18v. I want to connect the both of them in parallel and then insert them into a 10A solar charger. Will ...
0
votes
1answer
85 views

What will be the output/discharge current of a capacitor? [duplicate]

I am planning on doing an experiment where I want to connect a 2V 500mA solar panel to a 25F 2.7V super capacitor and then I will connect it to a 5V output boost converter. I know the capacitor output ...
0
votes
2answers
38 views

Solar cells with 5v regulator: would it supply more current than available?

I recently bought online three solar panels rated 6v x 500 mA for some circuits I had in mind. What I got instead were 12v cells, and I am certain they are rated 250mA, since the seller had those too. ...
1
vote
2answers
94 views

Can solar panel charging slow down the draining of phone battery? [closed]

I have made a solar panel charger, it consists of a 1.2 watt panel connected to a buck converter, then to the phone. Now, when I connect it, it charges the phone and in the battery settings it shows ...
0
votes
2answers
59 views

Solar cell driven transistors - circuit explanation

Question: what is the purpose of resistor R23 with value 1Mohm? Schematic of solar cell driven circuit is below. Circuit works as follows: When solar cell voltage is higher than 0.7V , LED is OFF ...
1
vote
1answer
85 views

Solar/battery powered LEDs circuit - Arduino controlled

First the battery is not connected directly but over protection IC logic. Question: Current circuit works as follows: When solar cell voltage is higher than 0.7V , LED is OFF (sort off ...
0
votes
2answers
52 views

How to determine the Solar-panel power requirement battery

I'm having a problem calculating the rated power requirement for my solar panel project. The panel will charge a battery that will power a 'micro' water pump. The power requirement for the pump is ...
0
votes
2answers
119 views

Switching between a solar cell and battery?

What would be the best method of switching between a solar cell and a battery, I'm currently implementing a system that is functional so long as the solar cell outputs a voltage between around 2V to ...
0
votes
2answers
53 views

solar augmented powersupply

I am considering to augment the power from my solar cell with a dc adapter whom will take up the slack when the sun can not provide, and feed it to my solar charger/regulator and led-acid setup. Will ...
0
votes
2answers
41 views

What is a suitable material to cover photo voltaic panels?

I'm building a small, portable, modular solar panel array to charge 5V power banks, phones, etc. I got most of the electronics down, the Step-Up converter, by-pass diodes, blocking diodes, as well as ...
0
votes
1answer
39 views

How to classify devices into photodiodes, photodetectors and photocells?

Is there a clear differentiation between the three? For example in terms of efficiency (induced current/incident power)?