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

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-10
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0answers
55 views

Greetings from Goa! [on hold]

I have a 20watt panel (for starters) and want to help the shack owner to provide lighting and internet in the evenig when the power often fails. I have brought 1. LMS 2430 controller 2. Bestek 600 ...
0
votes
2answers
35 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
36 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)?
-1
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0answers
50 views

Powering an always-on Arduino

I need help designing a circuit to power my Arduino. The Arduino has to always be on(or on as much as possible), and my plan is to use a solar panel and two 3.7v rechargeable batteries to power it. ...
-2
votes
0answers
38 views

how to connect solar panel , [on hold]

I have two similar solar panels, 24 V, 250 W, with max out put 8 amp and I have two other similar panels 12 V, 200 W, with max output 10 amp. I want to connect all four panels to supply my solar ...
1
vote
1answer
51 views

band pass filter on solar cell to detect laser

my target is detecting a laser generated with 1k frequency using a solar cell, i'm using this idea which is using a band pass filter on the solar cell to block the dc sun light and let me detect the ...
-5
votes
0answers
19 views

aa rechargable batteries for solar string leds [closed]

hi i have recently got some sets of 200 standard solar string leds the batt in the chargers is 800ma aa ive ordered some 3000ma ones rechargable, will these last longer on a days good sun charge? as ...
2
votes
3answers
95 views

solar power ESP8266 microprocessor circuit to turn off when low voltage

I intend to run an esp8266 microprocessor on only solar panels so it is on during the day and off/disabled during low light conditions that do not supply sufficient power. Is there a circuit that ...
0
votes
3answers
76 views

detecting laser using solar cell and band pass filter

I need to detect a laser signal using a solar cell. My first problem is that all I get is a current generated from the solar cell that will vary (as I understand and correct me if I'm wrong) in it's ...
-2
votes
0answers
36 views

What happens if I put two MPPTs after each other?

What if I buy a used solar panel with built in MPPT which I'm anaware of, and I put anoher MPPT behind that one?
-1
votes
1answer
53 views

What happens if I connect a solar panel and an AC/DC PSU in series?

I'm thinking about connecting the DC12V output of an ATX PSU with a solar panel in series. I want an always-on power source with as much power coming from the Sun as possible.
0
votes
2answers
96 views

Grid is capacitive in the evening

what does this term mean? "the grid in the evening is capacitive"? I work at a company and we are working on integrating a battery storage system on a utility scale for peak shaving of solar. When we ...
0
votes
3answers
86 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...
2
votes
1answer
32 views

Solar Power Watts/Volts/Amps

I have a 12v battery that is rated at 220ah. I have solar panels rated at 500 watts total. I'm using a MPPT charge controller rated for 12/24 volts I only have a rudimentary understanding of ...
0
votes
1answer
66 views

Solar panel subsystem project

I am trying to build a subsystem for a project that I am undertaking in university. An overview of the subsystem can be seen in the attached image. The only difference from my subsystem and the one ...
0
votes
3answers
48 views

Circuit for solar panel

I have done with a solar panel powered mobile charger. This is how it is now Solar Panel(5W,8V(max),0.59A(max)) -> 7806(5.4V normally) -> Female USB -> Mobile Since 78XX just reduces the ...
0
votes
2answers
72 views

What limit the current of a Solar Panel system?

I've a two solar panels (CS6C-150P). And each produces: 8,3A (Imp) 18,1V (Vmp) 150W (Pmax) Charge Controller: EP Solar - LandStar B - LS3024B They are parallel connected, then produces a total ...
0
votes
2answers
24 views

Help connecting solar cells to be 12 V

I just purchased a lot of 40 solar cells each with 1.8 W, 0.5 V, and 3.6 A. This gives a total of 72 W. Ideally, I would like to connect the cells in a manner to yield 12 V. I know I can connect two ...
0
votes
1answer
50 views

How small should I make my shunt resistor?

I have a small multi-junction solar cell that I will be taking measurements of short-circuit current and open-circuit voltage periodically in order to approximate an IV curve for the cell. I have ...
0
votes
2answers
87 views

Building a solar phone charger, how does a solar panel charge batteries and what voltage should the panel and the batteries be?

I am new to electronics, please don't mind mistakes Right now i have a 5v solar panel, and a 3.7v battery,and i plan on buying step up converter from 0-9-5v to 5v. I have an iphone 6 with the new ...
0
votes
1answer
44 views

Large load connected to small solar panel and battery

I have a smaller solar panel (say 12v, 0.5 amp and therefore 6 watts) connected to a 12v car battery (assume lead-acid) directly though with the included blocking diode, there is no charge IC ...
1
vote
2answers
170 views

controller circuit for charging 12V 7AH Lead Acid battery from main source and Solar source

I need to have a controller for charging a 12V 7AH battery and provide uninterrupted supply. The source for charging would be 12VDC from a PSU or if there is a failure in that from a solar panel. I ...
11
votes
3answers
411 views

Measuring output of solar panels for science fair project

I am in 7th grade and doing a science fair project using different solar panel arrays. I have 3 different configurations with 6 mini panels connected. For each configuration, I have all the positive ...
0
votes
2answers
51 views

Charging two 12V lead-acid series batteries separately with one 12V solar panel

I am working on a senior design project and just wanted to ensure the following charge configuration would work. I have a 12V solar panel that I plan to run its' output to TWO separate PWM solar ...
0
votes
3answers
89 views

Does a boost converter lower the source current of a solar panel?

I am trying to build a solar powered phone charger using small size solar panels. I have two solar panel connected in series, each of them are 4 V and 50 mAmps. When I connect the solar panels to the ...
0
votes
1answer
50 views

Overcharge Lithium-Ion when using charge controller + Arduino Load

I'm trying to determine if I need to rethink my circuit for a solar + Li-Ion powered Arduino. Basically a solar powered module with 3.7V Li-Ion backup for night / clouds (to be charged during the ...
4
votes
2answers
326 views

How do I charge a 6V, Lead Acid, 4.5 Ah battery using a 3W solar panel?

I have a solar panel with ratings: Vmp=8.8V and Imp=0.3A Using this i have to charge a 6V Lead Acid battery whose capacity is 4500mAh. I have searched the internet a lot and tried many circuits but ...
1
vote
1answer
83 views

Solar Battery Charging

I have a 3-AA battery holder and I am looking to build a solar battery charging circuit. I am planning on using 3 AA NiMh 1.2V batteries to be placed in the battery holder. I am planning to use a ...
1
vote
0answers
52 views

Designing a 3 mode smart solar battery charger with MPPT

I'm trying to design a solar charger with MPPT feature that runs in 3 modes (bulk, absorption and float) depending on the state of the battery. The logic is implemented in a fast micro controller and ...
0
votes
1answer
91 views

Connecting 3 12v batteries for a 24v system

I currently have two 100AH 12v batteries connected to two 240 watt solar panels, I'm planning to buy an additional battery, how do I connect it to the other two?
0
votes
1answer
26 views

What determines Charge Controller PV input limits?

What determines how much PV wattage a charge controller can accept? For instance - I am looking at a 50 amp charge controller with a max input voltage of 150v. In the specs it lists max PV input as ...
-3
votes
1answer
62 views

How to use solar panels in a electric go kart?

I am entering a electric go kart competition. Below are the electrical specification of my go kart. 1hp DC Motor. Normal batteries used in motor bikes (48 volts in total) And solar panels And i am ...
0
votes
2answers
62 views

Help using transistor in active mode as a current limiter

Brief context: I have a small solar panel, nominal properties are 0.6W, 6V, 100mA. In given conditions I want to measure the maximum power it can produce - I do not want to do anything with this ...
0
votes
2answers
123 views

voltage regulator prevent back flow of current?

I have solar cell with peak volt=9V and I=300mA. I want to charge 6V acid lead battery 4.5Ah. I'm thinking to put L7809 voltage regulator to prevent spike in voltage of solar cell and at night time ...
1
vote
1answer
59 views

What would happen if you connect a solar panel to a buck-boost converter?

What would happen if you connect a solar panel with the following characteristics: Max Power:3.5W Voltage: 6V Open Voltage: 7.2V To a buck-boost converter that convert an input voltage in the ...
0
votes
1answer
60 views

Calculation of solar panel and battery

I have a system that consumes 0.497 Ah, with a voltage of 5V. I did the calculations to feed the system with solar enegeria: Watt = 5 * 0.497 = 2.485W Hours = 48 hours of system use Total = 149.1W ...
0
votes
0answers
45 views

MPPT: Solar + SMPS intelligent charging

I want to extend my current MPPT solar changing with following requirements Requirement: 1) System can change both from Solar Panel(200W) and SMPS(16V, 10A) 2) Microcontroller or some other method ...
0
votes
0answers
64 views

help needed analysing my battery charging algorithm

I have developed a rough charging algorithm which i plan to use in my new solar charger which charges 8 lead acid batteries in series(96v),with a 1KW solar panel setup(4 x 24v,250mW panels in series). ...
0
votes
0answers
42 views

Effect of shade on solar panels

So some frieds and I are building a robot that is powered by solar panels. I am using a 3v 155mAh solar panel. What would be the effects of shade on the current and voltage output? Like, does the ...
2
votes
2answers
100 views

Brushed or Brush-less DC motor

We are trying to build a small Solar car the car's dimensions (Length :100CM, Width 60CM) the car mass is not going to exceed 2KG The car speed can be up to 2.5 or 3 m/s We`ll be using PV modules ...
3
votes
2answers
98 views

Confusion about solar cells and MPPT

Pardon the potentially silly question. I have been reading about photovoltaic (PV) cells and max power point tracking (MPPT). From what I understand, a MPPT module can use a DC-DC converter to change ...
0
votes
0answers
48 views

Solar cells/Photodiodes connected in series (opposing) - simulation

I would like to simulate a pseudo-IV curve of 2 solar junctions (exact parameters are not specified for now) conected in series (actually 1st junction is modeled by 2 diodes connected in parallel, in ...
-2
votes
2answers
75 views

Solar station gives almost no energy [closed]

I have a solar station on my roof which I use for a raspberry pi. I also have a battery which seems very big for me - it looks like a car battery. The solar cell powers the battery and then the power ...
0
votes
2answers
97 views

solar panel: how much energy has been charged?

first time here and still learning. I have just ordered a 100W solar panel with these specs: V:21.61V I:5.73A I am aware that to calculate the power output i can multiply V x I. However the ...
0
votes
1answer
71 views

Does the lm7805 have a minimum current requirement?

​I'm running into an issue when I tried to build this: http://www.instructables.com/id/20-minutes-USB-solar-charger/. I'm using a 9v solar panel. As soon as I connect the ground from the lm7805 to the ...
2
votes
1answer
46 views

Setting manual thermal voltage for a diode in LTSPICE

I want to simulate some series and parallel connected solar cells with the same reference temperature but different operation temperature for each cell. To do so, I need to configure the thermal ...
1
vote
2answers
108 views

12v battery banks and amp hours

So I'm new to the battery banks. One bank is (6) cells made of (2) 6v, 12 amp hour sealed lead batteries each. Wired parallel to make a 12v, 144 amp hour bank. Is that correct? Next I have a smaller ...
4
votes
1answer
65 views

When do we need blocking diodes?

At what point do we no longer need a diode in series with a solar panel to prevent discharge of a battery through the panel? Is it x amount of volts difference between peak power voltage and cell ...
1
vote
1answer
46 views

Is it possible to power a solar MPPT charge controller from a backup DC power supply?

I have a solar setup for some computing equipment that is working pretty well for me (most of the time), however it doesn't have quite enough juice to make it through the night on very overcast winter ...
3
votes
1answer
129 views

Building a Solar Inverter circuit

Recently, I have undertaken a Solar sun tracker project with the soul purpose of learning in mind. The basic operation of the project is to implement a dual axis solar sun tracker, this is done by ...