Questions tagged [solar-energy]

Form of renewable energy emitted by the Sun, coming in two flavours: photovoltaic and thermal. The former, especially, relates closely to electrical engineering since it is traditionally harnessed through semiconductor devices and converted to AC in order to feed the electric grid or individual users' homes.

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1answer
21 views

Issues with hooking up a solar panel to an air pump for a mini-hydroponic School Project

I am new to Solar and but I am a High School Science teacher. My question is in regards to a small scale hydroponic project that runs off solar. I need to get the 6v 2w 350mA solar panel to power up ...
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16 views

Measuring consumption of energy supplied from solar plant

I have solar plants installed across multiple rooftops in my space. The output of the 3 phase inverter in each building is connected to the electrical panel board of the same building. The output of ...
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1answer
19 views

Recharging of Inverter Batteries

Is it possible for some reason I can be able to safely connect two charge controllers (who draw their solar power from the same solar panel array) to charge separate/independent batteries? (It is to ...
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28 views

Is it safe to have two batteries in series on a solar panel system with 14.22v and 14.46v?

I have two batteries in series plugged to a solar panel system. In parallel they used to balance each other perfectly. But now i'm trying to have a 24v system and I have them in series. They ...
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2answers
33 views

PWM disables charging battery after heavy load on inverter

I have 2 batteries 12V 80Ah deep cycle lead in series for a 24V system. I connected an invertor directly to the battery pack. I have ~600W (~44V) of solar panels connected to the PWM charge ...
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1answer
89 views

How to connect a photovoltaic to a heating element directly

I am trying to connect a photovoltaic panel directly to a heating element (coil) without using a battery or an inverter and switch it on or off by using a transistor or a thyristor. I am well aware ...
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32 views

solar PV bypass diode v buck boost v SSR

I have 20 185W panels in two strings each to a ginlong GCI-2k inverter. The panels are W facing 45deg, between two pitches with some chimneys. The prediction for latitude and moderate shading is ...
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13 views

Fail to reboot after recharge, ESP32/ESP8266 using a MPPT and 18650 battery

I try to build a solar energy operated project. I'm using an ESP32 to wake up every 45 minutes, measure bat's voltage using board's ADC, and send it to an excel sheet on Google drive. The part of ...
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1answer
39 views

What is the maximum voltage for MPPT/PWM to charge a X volt battery?

I currently have a PWM 12/24v (auto commute) with ~18V as input and a 12V battery in the output. I wanted to switch to 24V battery and I thought about going ~36v solar panel. (18V * 2) Then I saw ...
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1answer
57 views

How can I switch solar panels on and off with a microcontroller?

I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.) My charger doesn't have an option to monitor individual cell voltages. ...
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1answer
46 views

Charging a big battery with small solar panels very very slowly

I have a 6V, .7amp solar panel that typically puts out 2-5V under normal conditions. I would like to charge a 12V 5 amp hr lead acid battery over a few days to weeks. The device that I want to ...
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28 views

Help modifying solar cell to include water cooling on simulink?

Hi, for my honours project at university i am basically doing an analysis of how water cooling a solar panel improves efficiency by decreasing the temperature of a solar cell. Part of my thesis ...
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1answer
59 views

Are bypass diodes in low voltage solar panels with parallel cells really needed?

I have 5 solar cells, ~3W ~3.3v 900mA each, a total ~15W, connected in parallel. Considering the low voltage and current involved, do I still need a diode attached to each cell? Will I still risk ...
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1answer
78 views

How long will it take to charge my solar battery full?

How long will it take six 100watts solar panels of 12volts each to charge four AGM batteries 200Ahm each, with 30ahm charge controller?
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81 views

How do I best visualize this voltage data for a science project?

I'm helping my son with his 7th grade science project. We've had a good deal of fun with our experiments with Solar Arrays and charging 12 volt UPS batteries! But, I am not sure how to interpret the ...
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1answer
88 views

I'd like to make a Led that lights up by solar panel [closed]

I'd like to make a solar panel that lights up an LED, not by charging a battery to power the LED, just live energy it is getting from the sun. I'm a real noob and need some advice. What panels should ...
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1answer
21 views

solar pv micro-inverter strings [closed]

According to wikipedia; a solar micro-inverter is a plug-and-play device used in photovoltaics, that converts direct current (DC) generated by a single solar module to alternating current (AC). I can ...
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0answers
48 views

Design of a 5kW residential Solar system with battery- need help with electrcial diagram

A design project asks for a design proposal of 5kW solar panel with inverter and battery system for a residential house. I have completed the energy estimation, panel size, orientation, and selected ...
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1answer
48 views

Temperature sensor for solar dryer heat control

I am designing a control system that runs a fan and electric heater based on the temperature measured inside of a hybrid electrical/solar dryer (for fruits and vegetables). Temperatures inside could ...
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1answer
38 views

Solar Module Voltage when bypass diode activate?

What happen to the voltage level when a solar module is shaded and one of its bypass diode is activated? Assuming this solar module has 3 bypass diodes. I have been reading and can't seem to ...
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2answers
114 views

Correct solar panels to pick for drone-mod

After this, I think I will take a course on electrical engineering (fuzzy from school days). I'm trying to add some flexible panels (they were <14g a panel)) to my drone (HS120D), to possibly give ...
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1answer
47 views

How does a solar cell its relative thermal coefficient “alpha” expressed in 1/K relate to %/K?

Some times I see the relative thermal coefficient of solar cells Isc (called "alpha" or α) written as 1/K, other times as %/K. ...
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22 views

Is it necessary to provide an additional protection at bus level in string inverters within a AC Combiner box?

I have drafted a AC combiner box for string inverters. Each string has its own protection (MCCB). So any fault occurring on a particular string will help in islanding the rest of the strings. Is it ...
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2answers
60 views

Why solar panel voltage remains rather constant while current increases?

Did an experiment and found that when the light intensity shinning onto the solar panel increases, the measured current increases while the measured voltage remains more or less constant with very ...
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23 views

Interrupt circuit by voltage - Low Voltage DC

Non EE here, looking for some advice. I have a solar power and battery system in my RV. I am using UpCycled Tesla battery modules for my energy storage. I want to better protect the batteries and ...
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1answer
71 views

Storing solar panels in direct sun

What is the best way to store solar panels when not hooked to a charge controller in direct sun? I was thinking about hooking each panels pos and neg mc4 connectors to itself so it will not be ...
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2answers
40 views

Recharging a 11volt rechargeable battery using multiple 5volt solar panels (Size: 53*30*3mm)

I want to make a circuit using solar panels. I want to recharge e 11Volt 1200mAh rechargeable battery with my solar circuit. The solar panel I will be using is 5volt, 30mAh. So my question is, how ...
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1answer
62 views

Mixed solar and wind farm

Is there any reason why solar and wind farms cannot share the same piece of land? The number of solar arrays that would have to be omitted to make way for the turbines should be relatively few. The ...
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3answers
103 views

Solar power backed circuit to light 1W LED

What I have achieved so far: Referring https://www.instructables.com/id/BUILD-A-NOCTURNAL-SOLAR-LIGHT-BULB/ , I have successfully built the solar garden light circuit to light a 5mm LED using ...
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1answer
62 views

Charging 4 x 12V lead acid battery with solar in series or parallel?

I have a small electric vehicle that currently uses 4 x 12V 8Ah SLA batteries wired in series as its 48V battery packs. I have 2 of these packs. In order to charge the batteries, I unplug all of them,...
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54 views

Using Constant Current Power Supply to control Load Output of a Grid-Tie Inverter

tldr: How do I adjust the power being dumped by my grid tie inverter? Is it possible to use a constant-current power supply to do so? I am planning create a PV system that will help reduce my ...
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3answers
88 views

Problem with a relay decoupling voltage

I made a simple circuit to alternate its output between two inputs: a photovoltaic panel and a 12V DC voltage source. The schematic: The step source represents the photovoltaic panel and the two ...
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1answer
83 views

Is it possible to patch together a DC system with these random materials? [closed]

I have a small collection of random batteries and solar panels, plus two charge controllers. I am hoping to build a system which can charge devices like phone, tablet, portable power banks, etc. (...
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2answers
212 views

What is the best way to limit voltage of a solar panel? [closed]

I am using a 6V 6W solar panel with the Particle Boron microcontroller with a battery pack. I want to ensure that the voltage supplied by the solar panel does not surpass 6.2V, as that is the max ...
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1answer
75 views

How can I determine how much power my solar panel outputs during winter?

Hi I have a circular shape 7cm in diameter solar panel rated at 5.5V 80mA = 440mW. My question is how much power would it output on average during the winter when there is about 8 hours of day light? ...
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2answers
116 views

What to do with the excess of energy from a solar off grid system?

I have an off grid solar system and I'm playing with it with raspberry pi and arduino. I'm looking for an automatic usage of the 12V power produced when the battery is full. (arduino have sensor for ...
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61 views

Could I use my PV inverter at night, feeding it from battery power? What would be needed?

First off, this is pretty much just a thought-experiment! I don't plan on actually going through with this as I'm sure it would void any warranty I have on my installation. Also, I'm totally ...
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5answers
4k views

Why are off grid solar setups only 12, 24, 48 VDC?

I am looking to produce 50kW for an off grid solar project. Ideally, I'd like to have a high voltage DC battery system with a high power battery inverter and charge controller. I have only found a ...
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1answer
55 views

Combining two power outs along with voltage regulator

I have two seperate solar panels with exact same circuitry connections. This is what I have: Solar panel -> Sparkfun Buck boost converter (set on 5v) -> TP4056 -> single 18650 AND + and - Power out ...
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5answers
101 views

How Can I connect My Solar Power System? [closed]

I brought this 50A Solar Controller now I want to connect an inverter to it and they said to connect the inverter directly to the battery. I also brought a 100W Solar Panel and MC4 Wires, etc What ...
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1answer
547 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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4answers
487 views

Is there a minimum amount of electricity that can be fed back into the grid? [closed]

This is not fully related to electrical engineering, but I have been reading lately about Feed-in-Tariffs and solar energy production and I cannot find any information on the amount of energy that can ...
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1answer
70 views

12V - How to activate an electric item if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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209 views

Is is safe to let my PWM charge my 12V battery at 14.8V?

I have a 12V battery linked to my solar panels. In the middle I have a PWM charge controller, that is configured by default to charge the battery if Voltage if lower than 14.8. At night, battery ...
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1answer
87 views

Can a solar inverter be damaged if installed capacity is much larger than demand?

I had a dispute with my fellow. In his opinion, a power inverter can be damaged if the load is much lower (e.g 100W) than installed capacity (e.g. 10kW) of the solar system. I am of the opinion that ...
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1answer
21 views

How are solar spectra simulators used and are they used to test photo-diodes and image sensors?

For example here is link to a Xenon lamp solar spectra simulator Xenon lamp AAA Class Solar Simulator. Two spectra are shown in the plot given in the link, one for the AM1.5G reference an other of ...
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1answer
111 views

How much installed capacity of wind or pv would be required to match the output of a 4GW nuclear power plant

I am trying to understand the challenge of decarbonising the power grid, and the equivalence between different generation technologies. If a nuclear power plant has a capacity of 4GW and a capacity ...
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3answers
92 views

What would be the most efficient way of wiring a solar power bicycle?

I have an electronic bicycle; 350 motor that runs off a 17.5 Ah battery at 36 volts. I've just ordered three 12 volt, 150 watt solar panels, that I'll wire in series to total 450 watts; giving 12.5 ...
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1answer
107 views

What's the benefit of 24V over 12V in solar and charging?

What are all the benefits of 24V solar systems over 12V solar systems in regards to solar panels and battery charging? All I've been able to find is that you can use smaller gauge wire with 24V, ...
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1answer
77 views

Mitigate voltage drops when using a relay

Hi and thank you for reading my question. I have a small experimental solar panel setup which charges a deep-cycle battery using an MPPT converter. I would like to power some garage and garden lights ...

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