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
278 views

MPPT solar charger for Lead Acid Battery

I've seen plenty of good MPPT (or similar to MPPT) chargers for solar panels, but they all seem to be made for lithium based batteries. Here's an example of what I've seen: https://www.adafruit.com/...
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1answer
169 views

Selecting a cable for 12V and 24V off-grid solar system [closed]

I have two systems connected to 1500W power inverter. Per case as shown below, what size (4mm, 5mm, 6mm ....) cable should I buy? Note: Based on my researches, the smaller ah output the thinner cable ...
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2answers
4k views

What is the failure mode of a solar panel?

I have understood that solar panels don't last forever. Warranties are typically a couple dozen years, and you can expect your panel to last for perhaps twice the warranty period. But what does ...
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2answers
144 views

Electrical specifications for a solar tube light with rechargeable battery

I was planning on simple project, the goal at hand is to make a tube light which has to run using a battery (max 4 hours during night) however I want the battery to be charged using solar panel, ...
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2answers
4k views

Grounding solar controller

I am wiring up the solar system in my van and I need help with claryfing some things up. I have a Phocos CA08-2.2 controller and in the manual one can read: Be aware that the positive terminals ...
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2answers
519 views

What are the compulsory tasks of a charge controller for a lead acid battery?

Solar charge voltage regulators should coordinate the charging process of a battery. Suppose that I would like to design a very basic charging regulator controller with the following specs: The ...
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2answers
2k views

18V/5W solar panel to trickle charge a 12V car battery?

I'm running a small Arduino project out of an old 12V car battery (that was on my car since 2008 till 2015). I also have a 18V/5W solar panel. Can I connect them together so the solar panel charges ...
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1answer
457 views

Diode oring for solar charger with dual battery isolator?

I want to charge a deep cycle battery with a solar charge controller and dual battery isolator powered by the car alternator. The dual battery isolator will provide the most charging power when ...
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2answers
58 views

Can I get all the energy from a PV system if it is only hooked up to a CC and batteries?

What I mean is that I know a charge controller regulates the voltage and current into your batteries to protect them (and CC's can incorporate MPPT's to extract more from your solar panels), but do ...
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1answer
228 views

Do i need to use capacitors with a 5v voltage regulator?

I am using a solar panel with a regular 12v charge controller but instead of using 12v batteries i am planning to use li-po batteries with a specific charger. I know that the best way to step down ...
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2answers
15k views

Am I supposed to ground the inverter or the battery? Or both? To vehicle chassis

I am setting up a solar system in a vehicle. I have 400W solar panels, a 12V battery bank, and a 2000W inverter. I've looked at the manuals and read online to figure out the wiring diagram below. ...
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1answer
71 views

LDO Regulator TPS737xx, connecting Enable to VIN and avoid damage when removing VIN

I'm designing a PCB that is powered by this solar charger using a 3.7V LiPo battery (maybe I'll have to move up to a 4.2 battery). I want to regulate that voltage to 3.3V for feeding a microcontroller ...
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2answers
216 views

Off-grid solar setup [closed]

I am planning to set up an off-grid solar system for my small home. Based on my research, I now have some level of understanding/clue about the devices used in the system but need clarifications as I ...
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1answer
2k views

CUF v/s PLF of power plants

What is the difference between capacity use factor (CUF) of solar power plant and plant load factor (PLF) of coal based power plant? Can we compare both since they seem analogous?
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1answer
198 views

How to combine 2 Solar panels for double A

Sorry I'm still a rooky in electronics so forgive me if I make obvious mistakes. I have 2 small solar panels. 5v 160mAh. The 5v is alright for my project and I thought I could double the current by ...
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3answers
2k views

Does a Buck-Boost Converter/PWM controller significantly reduce the energy you can get from solar panels?

As a heads up, I edited this question to make more sense based on what I have learned. I think this is okay since no one has answered the previous question yet. So I'm designing a solar system and ...
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1answer
301 views

Battery-less solar generator

I have read a lot about off grid solar systems. Most of the reasons I have seen to not directly attach PV panels to an inverter without a battery are: Under voltage when not enough sunlight. Pulling ...
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2answers
439 views

Solar panel: temperature coefficient of Pmax

I am trying to determine the best solar panel for my needs so I've been looking at the datasheets. But I've noticed that some of the datasheets are lacking the temperature coefficient of Pmax. Is ...
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2answers
252 views

Avoid current spike in buck converter

In image my model to simulate PV array & MPPT with buck converter . The result from this model have two problem: At t=T=1/f occur current spike in diode current and Vpv up above Voc. In battery , ...
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52 views

If not enough current then switch

(Sorry, I am a newbie but here I go..) I have a 5W 12V solar panel stepping down to 5V. The current then goes through a charger that already regulates to the required voltage for the battery. This ...
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3answers
237 views

Help! Regarding solar panel to supercaps to battery charger

I am looking for some advice on how to improve my current system. In brief, I live off grid but am a keen drone enthusiast. As such, I am constantly having to charge these 0.9 amp, 7.4 volt, 2 cell ...
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3answers
142 views

Is MPPT used with very small panels

Say for example an inexpensive solar calculator or other such similar device with what appears to be lets say a single 2.4V 6uA (microwatt) panel? Is an MPPT used to get the most panel rather than ...
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1k views

PWM solar charge controller MOSFET

This diagram is from a PWM solar charge controller datasheet, http://www.epsolarpv.com/en/uploads/news/201310/1382338419195066.pdf I have 2 questions about it: 1-Why they used two MOSFET in series ...
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2answers
501 views

How will it take to charge 36V 4Ah battery using a 5V 2.4A Solar Panel?

I'm an electrical noob (don't know the right formula to use for this calc) I have a 36V 4Ah battery and a mini solar panel that puts out 5V at 2.4A. How long would it take to charge the battery? ...
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1answer
172 views

switch load depending on battery voltage

I have the following set up; simulate this circuit – Schematic created using CircuitLab MPPT charge controller: https://www.sparkfun.com/products/12885 Load: Raspberry Pi Zero Battery is: ...
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3answers
5k views

Do solar panels generate variable current or variable voltage?

Many solar panels are watt-rated. The generated power depends on lighting conditions, so either the current and/or voltage is variable. Which one is it?
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225 views

Solar panels burning down 12 volt appliances

I have two solar panels. One is 310 watt 39 volt 8 amp and 2nd is 250 watt 37 volt 8 amp. The 310 watt one burned down a 12 volt fan, then I bought a 24 volt fan and have operated it on both panels ...
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3answers
1k views

How can keep output voltage constant in pv system with MPPT (FOCV method) and buck converter?

I simulate pv array (P=213 W , Voc=36V , Isc=7.84) with MPPT (fractional open circuit voltage method + PI controller) by using buck converter , and it's work very good with power efficiency 95% with ...
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2answers
153 views

How to partially drive a load with respective impact on my electricity meter?

I want to optimize the use of my photo-voltaic production by redirecting the remaining unused energy to electric heaters in winter, or something else in summer (given that fans are inductive loads and ...
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2answers
943 views

Solar powered mini fan

for a school project I have to do something that needs the environment to work, my plans are to make a solar powered mini fan, now my question. How can I make that the fan ( 6v dc motor) keeps working ...
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1answer
812 views

On-grid solar system - how to control power out from solar system to grid? [closed]

If on-grid solar system is connected in parallel with grid, solar system give power to the grid when local (at house) consume power less than generated power from solar system. The question is: When ...
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1answer
164 views

Solar cell charging circuit

I'm trying to build a very small LED light that runs of solar power. The goal is to have it charging most of the day and maybe get about 15 minutes of "led power" per day (comparable to these solar ...
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1answer
150 views

Voltage measure problem in charge controller

1: I not understand the procedure of measuring SOLAR and BATTERY voltages. The time the MOSFET Q1 ON, the voltage will be nearly the same on solar and Battery side even if we start to charge the ...
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1answer
617 views

Charging Lithium-ion in parallel

I have an Asus Zenpower power bank and originally I had an idea where I was going to connect a solar panel which had voltage regulator to 5volts to the charging input of the power bank but when I was ...
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2answers
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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1answer
30 views

parrallel charging of loads

I have the following setup; 20v solar panel -->> MPPT chagre controller (sparkfun sunny buddy) -->> battery(3.7v 7000mAh & 5v microcontroller in parallel, see diagram below. In full sunlight and ...
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1answer
882 views

Can I use a 12V battery charge controller to “ballance” two batteries?

I have a simple question which drives me crazy and I'm really hesitating to test it, this is why I ask for your opinion. At home I am using a solar system, using solar panels and a battery. The ...
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0answers
44 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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1answer
892 views

How best to recharge 3.6v Lithium Coin Cell batteries safely from small solar panels?

I want to charge 'rechargeable' 3.6v Lithium Coin Cell batteries with one or two 3v 100ma solar panels. Do I need to worry about safety and overcharging the batteries? How can I measure if the ...
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1answer
207 views

Limiting 14V current to 50A [closed]

Given multiple possible powerful charge sources without adequate over-current protection, and a very large (say 500 AH) depleted battery bank, using a very low resistance / high acceptance rate ...
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1answer
59 views

Allowing the energy flow INTO the solar panel (photovoltaic), what happens?

I was watching this video https://www.youtube.com/watch?v=HZf-sm3UXX0&feature=youtu.be&t=3m4s as I was willing to learn how to test my solar array, from 3m4s he's testing the Amps provided by ...
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1answer
46 views

What is the relation between efficiency of solar cella and incident light power \$\eta(P_{inc})\$?

What mathematical relation, if there is one usually valid, describes the variation of efficiency \$\eta\$ of a solar cell (i.e. the ratio of produced electrical power \$P_{el}\$ and incident light ...
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1answer
278 views

Connecting solar panel to breadboard

I apologize if this is foolish question, but I wanted to know how to connect a solar panel(that has no wires) to a breadboard. I wanted to test it out, but I am confused how to do it. Thanks for any ...
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1answer
571 views

Running BLDC motor using Solar Panel [closed]

I have a 1250W 48V BLDC motor Can anyone suggest me what combination of solar panels I should use to best run my BLDC motor . I wanted to run my electric vehicle solely on solar energy . Thank you!
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1answer
1k views

Combine two power sources with higher priority for one source [duplicate]

I have two power sources, one is solar panels (DC), another is from grid (AC). Is it possible to combine these two power sources with solar getting higher priority ? By high priority I mean draw power ...
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1answer
248 views

How to predict the output of a solar panel depending upon weather conditions for real time hardware simulation?

I want to build a system for smart grid which can optimize the grid power, load and battery charging to reduce my costs for grid power. For the optimization problem, I must know the current date to ...
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0answers
235 views

What should I keep instead of this energy harvester breakout for maximum efficiency of the solar and supercaps circuit?

This is my circuit which charges the supercapacitors. The problem with the circuit is the minimum input voltage require to get 3.3 volts output. Once the input voltage goes below the certain level ( i ...
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0answers
97 views

Passive Cell balancing affecting Gas Gauge Coulomb Count

I am designing a solar 7.4V Li battery charger, and want to include gas gauging, and cell balancing. If I use passive cell balancing, I waste power and cause my coulomb counter to lose count. Is there ...
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2answers
1k views

Li-Po/Li-Ion solar charger and 3.3V stabilized output

I'm working on a project with ESP8266 and I want to power it with solar panel and a Li-Ion/Li-Po backup battery. I searched on google and I found a buck/boost regulator is required to stabilize ...
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1answer
68 views

Does this solar panel setup with batteries meet my power needs?

I'm working on a network setup for the middle of no where. I want to try and use solar to run the network hop completely. I have never built anything like this before so I wanted to run it by some ...