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

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0
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2answers
16 views

Why a diode is in parallel with the current source in the equivalent circuit of a solar cell?

The model of a solar cell has a diode in parallel to the current source: (source) Why is the diode in parallel and not in series with the current source?
1
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1answer
14 views

PV array project

I am working on a PV array on simulink and I just need help on a math question. On the article I'm basing the model on, the model voltage equation is Vm = VmT - (5- G/0.2) for the voltage to vary ...
0
votes
1answer
48 views

Should I connect solar panels in series or parallel for my charger?

I am making a solar charger for 3 AA batteries. I have two 6 volt 100mah solar panels. Will it be more beneficial to connect them in parallel to have more current or in series to increase the voltage? ...
1
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0answers
16 views

Theoretically simulating photo-voltaic solar panels using math/code

I'd like to simulate the behavior of PV solar panels and model how various parameters affect their performance. For example the effects of irradiance, temperature, and series and shunt resistors. I ...
-2
votes
1answer
60 views

How much power could a 5 x 3 cm turbine and a 5 x 5cm solar panel generate? [closed]

I would like to make a project and generate a few power using a combination of a small wind wheel (let´s say 5 x 3 cm wheel) and a small 5 x 5 solar panel. I am not sure what the median wind speed is ...
0
votes
1answer
47 views

DC Bus for Solar Charge Controller Battery

I am just learning the set up for a back up power. I am just wondering whether the DC output from the charge controller or the battery can be used for multiple loads. For example, I want to power my ...
1
vote
1answer
29 views

Solar cell charging and battery chemistry for low power 2.4-3V supply?

I've recently been looking into the possibility of using an amorphous silicon solar cell (like they have in calculators) to supplement my very low power BLE system's current consumption to extend the ...
0
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0answers
17 views

Wire size for solar panel-Buck-Boost Converter

A DC-DC buck-boost converter supplies a constant 14V to a load that draws 2A of current. The measured efficiency of the converter is 80%. Consider a solar panel with Voc of 21V and Vmp of 18V . ...
0
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1answer
44 views

DIY 18650 charge pack questions

I've tried searching through existing topics but haven't found an answer. I'm a beginner enthusiast. I have a couple of questions that I would appreciate input for. My plan is to make a battery ...
0
votes
0answers
19 views

amh needed from solar panel to run and charge

So I am making a small solar powered circuit to run a pond water pump (a 6v pump 333ma) I initially bought a 6v 333mah panel (in hindsight I have realised this is wrong as not enough juice will be ...
0
votes
4answers
71 views

What should be the watts of solar panel and battery size

I want to light one 70watt bulb for 12 hours at night time. I want to know what should be the Watts of the solar panel and how much Ah battery will I require? I searched many of the questions here ...
0
votes
1answer
40 views

Charge CR927 battery with small solar cell? [closed]

I am developing a Bluetooth tracking device that uses a single CR2032 battery. Would it be worth using instead a rechargeable CR927 (40mA) battery and a small solar cell, the size they put in watches? ...
0
votes
0answers
65 views

How to connect these two led strings?

I've recently bought myself 2 sets of leds. Each set has 10 leds in a row powered by a solar panel which charges 2x 1.2V batteries. My question is what do I have to do when I want to have all of the ...
0
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0answers
31 views

Are you at Maximum Power when you have an MPPT circuit that outputs the Vmpp?

Iam currently simulating the maximum power of a pv cell and wants to get the MPP using the constant voltage method, though I was just wondering if it is enough that I got the Vmpp since I am only ...
2
votes
3answers
73 views

Enable grid-tied solar array power output during grid outage

I am getting close to investing in a micro-inverter (Enphase M250) based grid-tie solar array for my home, but am concerned I won't be able to use the solar power during grid outages. I found a ...
-1
votes
1answer
80 views

Automatic adjusting output into automatic adjusting input [closed]

I have a solar panel with a built-in 6-18v auto adjusting output (based on draw) and a step up/down 1.5-24v DC-DC converter with an auto adjusting input. I was thinking of using them in conjunction ...
0
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0answers
26 views

Switch (safely!) between running/charging status with li-ion batteries (18650) in series

I am building a solar robot/car which is going to be solar charged (or alternatively usb, I can't detach batteries to charge with an external charger). I am using inexpensive parts such as TP4056 ...
0
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0answers
43 views

Solar Powered Lantern - Year 9 Project Idea

I am a Year 9 engineering teacher and I want to revise one of my current projects to be better but I need some help. The project idea is using a 1.5v Solar Panel (from a solar garden light) to charge ...
0
votes
2answers
25 views

What charge controller would be required to charge a 12v battery with 40w solar panel? [closed]

I am looking to setup a 40w (or similar) solar panel on my SUV to charge a 12v deep cycle (AGM) battery for use when we're camping and that sort of situation. I am unsure as to what sort of charge ...
6
votes
1answer
83 views

A naive solar panel maximum power point control circuit

I am fooling around with a solar panel, just to try stuff and learn in the process (not trying to produce something I would actually use). Its placement is very far from optimal - vertically behind ...
0
votes
1answer
45 views

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

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
31 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
vote
3answers
89 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
votes
1answer
47 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
vote
2answers
59 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
54 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
votes
0answers
26 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
192 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
votes
0answers
38 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
votes
1answer
40 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 ...
0
votes
1answer
30 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
51 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
44 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
39 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
39 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
44 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
votes
0answers
9 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
36 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
87 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
vote
1answer
60 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
votes
2answers
54 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
64 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
vote
4answers
52 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
votes
1answer
41 views

Recycling light using photovoltaic cell [closed]

Can you recycle light emitted via mobile using photovoltaic cell and feed it to the mobile.?
0
votes
2answers
31 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
50 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 ...