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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28 views

Powering a max 360 W Ender 3 Pro with a 300 W inverter

I’m planning on powering the Ender 3 with a 200 W solar panel with a 300 W inverter. I saw on some posts that the Ender 3 draws 500-ish watts whilst starting up but then drops to an average of 150 - ...
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52 views

Solar powered mini water pump: how to turn it on/off automatically

I have acquired a mini water pump (5V 1.0A) and several solar panels (each: 5V 200mA). What I try to achieve is to pump water from a container above a vertical hydroponic system and let it flow down ...
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62 views

It is possible to use a 100W 12V solar panel directly to charge a laptop, using a buck converter for example?

I am planning to go off the grid due to the pandemia, to an isolated village. I am working remotely I am looking for a solar approach to power my laptop ACER A5 515. The charger is rated 40W. I was ...
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29 views

Using a LiPo battery or different battery for outside project

First I am sorry if this is the wrong section to post this, I have been searching for a clear answer and haven't found one yet. I have a project that I want to keep outside. I have a solar panel, ...
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37 views

Solar panel to battery, dc to dc converter question

I need to design an MPPT and the converter that uses it. the thing is: the Solar panel has a max voltage of 40V and the battery that is going to be charged is around 100V, the most easy thing would be ...
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37 views

Systems Engineering Solar Energy Diagrams

I'm currently taking a grad course in Systems Engineering. I'm dreading it a bit as I've taken grad math for the past 3 years and this is my first writing course in a while. We're covering context ...
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51 views

Solar DC circuit: Preventing Buck Converter from Dropping out Due to Motor switching on/off (in Parallel)

I have an off-grid orchard which has a well pump running directly off of a 24v PV array. (27-32v when at full power) Parallel to this direct circuit, I have a buck converter to power a Raspberry pi (...
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28 views

How to deal with “Brown on” slowly increasing voltage/current from solar panel to power mcu

With a solar panel powering an Atsamd21, I have the problem that the mcu will not boot correctly and gets stuck at some point. How can I deal with this? I thought of adding a large enough capacitor ...
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Charging Electric car battery from solar panels using PV cells and Zappi charger

In the UK there is an ev car charger made by myenergi which uses solar panels to charge your car. The link to the product is below https://myenergi.com/product/zappi/ This product allows you to ...
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32 views

Interfacing Arduino for variable power supply

I'm a mechanical engineering student with no knowledge on Arduino microcontroller. I am currently working on a project of using Artificial Neural Network in a hybrid solar heating system. The hybrid ...
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48 views

How to Wire DC Motor to Solar Panel and Battery to Only turn on at Night?

I have tried looking this up on google but can only come across ones that have the motor running all the time from the solar panel and battery, where I need it to run only at night. So anyways, my dad ...
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67 views

Simple circuit to protect 2.7V supercapacitor from exploding

I need advice and help. I am newbie and kind of interested in building things. Please bear with me. Situation: I want to power my wireless modem/router using a solar panel so when there is no ...
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20 views

Alternative ways to wirelessly power a small load

I'm working on a project which needs to power a small DC motor (50-70mA @ 3.3V). It will be placed in a picture frame hanging on the wall, therefore powering (or charging) it with a cable wouldn't be ...
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126 views

Why doesn't light destroy the PN junction voltage gradient in a solar cell?

I understand that a solar cell is, essentially, a P-N junction. A P-N junction, roughly speaking, will do the following: The free electrons on the N-side will flow over to fill holes on the P-side. ...
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32 views

Solar panels sharing two controllers on two separate batteries

Installed a system for a client but it's not working well.two panels each 175watts have 2 bringing in 350watts to a controller of 10amps to charge two different batteries of 100Ahr each total of ...
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60 views

Why does shading a single PV panel in a series string reduce the current output of the whole string?

I would like to understand how shade on just one panel in a series string reduces the current output of the complete string.
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19 views

How to Ground DC 12V Battery, Charge Controller and Solar Panel?

In my shed, i've got a 12V 120AH leisure battery and 30A MPPT solar charge controller, on the shed roof there are three 100w 12V solar panels. I wonder if I need to ground any of those? If yes what ...
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39 views

Formula to calculate power from a solar panel?

I am currently working on a project that works with solar panels on Mars and I am trying to calculate how much power I would get from a solar panel on the surface. I have values such as solar ...
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33 views

Do I need a blocking diode for bulk capacitors connected to solar panels?

I have two 100 uF bulk capacitors connected directly to a solar panel which connects to a BQ24298 charge controller on a Particle ESeries microcontroller. I have them left unpopulated because I don'...
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54 views

Can my solar inverter be significantly driving UP my power consumption or my meter counting excessive production as usage?

I've had a 1.5KWh PV solar system for 3 months now and as any new user I've been monitoring the power generation closely. I've wanted to correlate the power generation to my power usage so I've ...
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32 views

Is the current rating of the buck converter must match the dc load current? [duplicate]

I am designing solar system for 1.2kw, 12vdc load and I want to insert a 48vdc to 12vdc converter between charge controller and load.what are the main things that I have to look at when I select this ...
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39 views

Can I use a 18v solar output to charge a 4s lithium ion battery pack

So I have a couple of LG 18650 of 2200 mAh batteries each and a solar pannel that provides 18v output under load and 21 v under open condition. I'd like to build a 4s battery pack with a balanced bms ...
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96 views

How to convert 240 VAC to 240 VDC [closed]

I have a few questions, namely: I aim to charge a 220 VDC battery pack with solar panels producing 240 VDC when open circuit using an MPPT charger. Where may I get such an MPPT charger? I'd like to ...
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64 views

Can I use 2.5kW solar panels to power 2kW rated grid tie solar inverter?

Can I use 2.5kW solar panels (10x 250 watts) to power a 2kW rated grid tie solar inverter? Will anything blow up? Panels: 10x 250W, 36V panels Inverter: 2kW with max input voltage: 500V Any help is ...
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51 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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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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57 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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96 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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33 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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19 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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48 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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63 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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63 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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29 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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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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82 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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82 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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95 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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24 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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49 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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50 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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45 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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124 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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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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23 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
75 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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24 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
77 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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