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.

72 questions with no upvoted or accepted answers
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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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109 views

Calculating realistic solar cell output

This past summer I installed a couple of 12 volt 100 watt solar cells on the roof of my caravan. I was never naive enough to actually expect to get 100 watts out of them, but I've still been very ...
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183 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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42 views

Charging solar batteries

I have a few questions about installing solar. 1) I have a 125-Amp panel that I would like to outfit with solar. (from the inverter) what wattage would I need of an inverter? 2) How many 18Ah-...
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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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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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2answers
41 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
63 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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1answer
78 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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92 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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67 views

Battery charging while in use in a bank

I have fifteen 12V 150Ah flooded batteries in series as part of a 10kVA off-grid system. Every once in a while, I test individual battery voltages. I've noticed that a few of them are, regularly, ...
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44 views

How to consider lifecycle in PV power smoothing?

I am planning to size Battery for Solar PV system by smoothing the PV output. Capacity size can be obtained by looking at Max charge/discharge needed to smooth the fluctuation. This should make able ...
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1answer
692 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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2answers
236 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
47 views

How to manage solar panel as backup power source

I have a 12V PC cooling fan (Evercool PWR-1225H12B) that will run on a 12V regulated supply. Said supply is on a 12 hour daily timer. In addition to the timed supply, I want to have a solar panel as a ...
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1answer
75 views

Is there any risk in leaving a Li-ion connected to a solar panel with only step-down converter?

I have a 18V solar panel which is connected to a step-down buck converter, which drops the voltage from 18V to 3.5V. When clouds block the sun, the voltage drops to less than 3.1V. I have added a ...
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278 views

LM2596: input voltage varies with output voltage?

I have a 12V solar panel connected to a LM2596 (the one that has one pot for changing output voltage) that gives me a nice 5V output. However, when I check the voltage at the input pins, the voltage ...
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42 views

current measurement in series-parallel solar panel array

I have a solar panel array wired in series-parallel. I know the voltages in a series network will be the average voltage, and the current in a parallel network will be the smallest contributing ...
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263 views

How to synchronize current from an AC and DC current

I'm trying to make a battery less solar grid in which energy from the solar panel will be directly given to home appliances and will be complemented by current from the grid. I'm thinking of passing ...
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74 views

Solar Cell Performance With Varying Incident Angle

I am trying to calculate the power generated from solar panels placed on the Moon. I have an equation for power generated at the beginning and end of life and have hit a snag in my brain. If the solar ...
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67 views

How do you know if a decentralized solar PV is connected in series or in parallel?

I'm using a decentralized solar PV system(4 nos). I want to know that are they connected in series or in parallel ? The output current of each of my converter connected to solar panel is 4.4A. So ...
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1answer
21 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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32 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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36 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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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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16 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
50 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
49 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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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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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
66 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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61 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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67 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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66 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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1answer
737 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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30 views

Measuring voltage on different grounds PV inverter

I'd like to create a voltage meter that can measure battery voltage and PV panel voltage. The only problem is that the PV input and Battery I/O doesn't share ground. I'm not sure if tying the grounds ...
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1answer
26 views

Using USB to supplement solar panel

I have a solar panel that outputs maximum 1.2W (7V, 0.17A). a 5V 1A USB power supply a 3.5-9V, 1-3W water pump. I'd like to have the water pump running all the time using power from (1) and (2), ...
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52 views

Solar power pump - Design critique and help

Okay so, I have a design that 'works' on the breadboard. But I feel like it could use some improvement. Here is my current design: simulate this circuit – Schematic created using CircuitLab ...
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33 views

Is there a Energy Harvesting Power Management and Battery Charging EVM dev kit (e.g. BQ25504) with easily adjustable voltage thresholds?

I have a BQ25504EVM-674 Energy Harvesting Power Management with Battery Charging (EHM) development board by Texas Instruments. It fulfills my requirement of charging an energy store (e.g. supercap/...
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61 views

Small solar power threatens grid TGFOV?

Can solar power systems under 10 kW, single phase, with micro-inverters pose a threat to grid reliability due to a threat from Transmission Ground Fault Over-Voltage? I have researched this topic ...
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63 views

Why does reactive power change when a secondary source is connected?

When load was varying very little, PV supply was turned ON. Inverters used can give power factor(PF) in the range of [-0.8, -1] and [0.8, 1.0] Table 1 shows power requirement when only grid was ...
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1answer
320 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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1answer
47 views

How to measure available amps? Do i need more load?

My new 200W 18v 11a(max) solar panel reads about 24v 4a 50% efficiency at midday on my MTTP Rich solar controller. I presume this is not great. I was wondering... I have a 48v to 12v stepdown ...
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339 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
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60 views

How to calculate the current produced by a solar panel?

The equation for calculating current when given voltage and temperature is known as the 5-Parameter model ie. \$I = I_{ph} - I_o[\exp(\frac{V + R_sI}{nV_t})-1] - (\frac{V+R_sI}{R_{sh}})\$ Since this ...
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1answer
65 views

Solar Panels: Charge Batteries via MPPT Charge Controller *AND* Power PV-Direct Load At Same Time?

I have two 290 watt panels in series that are currently used to charge a 48V battery bank via a MPPT charge controller. The run from the panels to the charge controller and batteries is about 70', and ...
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1answer
129 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 ...