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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167 views

Powering refrigerator using solar inverter

I have got a 3 kVA (2400 watt) solar hybrid inverter (pure sine wave) which is connected to a 1280 watt PV array and 2 x 12 volt 150 Ah batteries. It is supposed to switch to utility mode if the ...
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49 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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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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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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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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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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296 views

Different Wattage Solar Panels for Home [different Voltage/Ampere]

My current solar system for home 12V 100W polycrystalline Solar Panel. 12V 75Ah Lead Acid solar tubular Battery. PWM 12V 10A Solar Charge Controller. 12V Input and 200VA Output Inverter. Current ...
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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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765 views

Simple solar panel + supercap powered arduino

Long version (full story, so skip and go direct to questions below if you want to): I have small arduino mini pro board powered by 230mAh Lithium coin battery used as wireless sensor (with NRF24L01 ...
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373 views

Solar Panel Not Powering Toy DC Motor

I made a 15v solar panel from garden lights which supplies 50mA of current in direct sunlight. For some reason it doesn't power a simple dc motor which can run on a 1.5v battery. Why isn't it powering ...
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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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27 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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884 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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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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397 views

Charge lithium ion batteries at -30°C

I see here (Battery University) and here (Electrical Engineering StackExchange) some claims that it is indeed possible to charge lithium ion batteries at -30°C if you do so at a 0.02C rate, but I don'...
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2k views

Using the frame of an RV trailer for the ground

I have an RV travel trailer that I use a 2000W generator to supply power to the 30A incoming power socket. I have also added 2 × 100W solar with battery minder, a 3000W sine wave corrected inverter ...
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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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207 views

Estimating the current consumption of a DC motor

Good day, I am wondering if it's possible to estimate the continuous current consumption of a DC motor vs startup or rated current. I am trying to put together a solar powered aquaponics system. The ...
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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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1answer
119 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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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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2answers
151 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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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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62 views

Solar panel system - figuring out the right specifications

I'm building an off-grid security system, based on a smartphone as a 24/7 security cam and an arduino nano for several sensors. A pretty interesting build in my opinion, maybe I'll post about it ...
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1answer
185 views

Problems when powering a circuit directly from Solar Panel

Am working on a project which uses Solar panel to power the project. I have a 12v 5w Solar panel to use for this purpose. And am thinking to remove the battery from this project since I feel that ...
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1answer
169 views

Mini solar panel to DC motor

I have a mini solar panel 5.5 V 1 W 180 mA and I want to connect it to my DC motor 3-6 V. I tried directly but it didn't work. After some research I found that I needed a inverter. My question is: do ...
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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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331 views

How to model MPPT technique with PID controller

I need to model a MPPT algorithm with a PID controller at Simulink. The model will feed the gates of two mosfets of a push-pull converter. I have to extract max power from PV and have a fixed voltage(...
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56 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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2answers
247 views

Low-power solar cell source using capacitors

I am designing a circuit using AtTiny10 to supply a downstream microcontroller with power using only capacitors and a small solar cell. Would the following design work ? The basic idea is that the ...
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1answer
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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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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1answer
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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