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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4answers
142 views

Maximum power point, why do you need to change voltage again? Isn't it simply \$ P = i^2 \cdot R \$?

So I'm reading up on MPP, and I don't get it. Let's say there's solar panel, now there's flow of electrons from solar panel, correct? That's how you get so-called "power" into the battery, right? I ...
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2answers
65 views

How to calculate battery ratings for your solar panel?

If I want to choose a battery for my solar panel which is required to run a load of 5 kWh/day. Then I will be needing a battery with a rating of above 23 ampere hours since 5 kWh/220 V (since 220 V we ...
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3answers
543 views

How can microinverters be as efficient, or more, than power optimizers of solar arrays?

According to Wikipedia: solar panels produce voltages around 30 V. This is too low to be effectively converted into AC to feed to the power grid. To address this, panels are strung together in ...
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3answers
736 views

Weird phenomenon with AGM batteries

I will try to sum everything up and keep it as clear as possible. I have a solar system: inverter: 1500VA 24V system batteries: AGM 100Ah (20 months old daily cycle) controller: semi-MPPT 80A 24V ...
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2answers
132 views

Advantages of chaining another battery to 130Ah AGM deep cycle 12V battery

I have a 130Ah AGM deep cycle 12V battery for camping connected to 2 x 100W solar panels. I have been testing the system out to see whether it will sustain what I require. I think I’ll require around ...
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738 views

Grounding Neutral Off Grid Solar

Is it recommended to ground the neutral line in an off grid solar system? A nonisolated inverter would be by definition wired this way, right? I believe that in home electrical systems neutral is ...
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2answers
61 views

Off grid solar PV system for developing countries [closed]

I am designing an off grid system for developing countries for charging cellular phone, tablets pad and notebook computers. Design aim is to use low cost, simple, mature (slightly older) and mass-...
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2answers
926 views

How do solar panels affect the short circuit fault currents of a network? [closed]

As title suggests, I'm trying to find out how adding PV, both residential and solar farms, have an effect on the short circuit fault current of a network. I wasn't given much info to go off, so I am ...
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3answers
153 views

Feeding energy to the power grid

I am doing a research about the electricity grid and a marketplace where neighbours can trade energy with each other. I found out if your PV cell has excess energy you can with an inverter put it ...
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1answer
66 views

Pedestal fan/refrigerator simulation

I want to simulate my PV system of 750 watts with 2* 100Ah batteries. My load is a pedestal fan and a refrigerator. I am confused as to how I can model a pedestal fan and refrigerator on Proteus/ ...
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1answer
55 views

Battery size/type depending on desired usage

Directly below is the overview of a project that has been working well for around three months. A 6 Watt, 12V LED spotlight powered by a 12V 7Ah sealed lead acid battery, controlled by a timer switch ...
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2k views

Is the power from solar panel redirected to load when battery is full?

When the solar panel attached to a charge controller then to a battery, simply stops the charging when the battery is full or Is the charge controller(MPPT) smart enough to redirect the power directly ...
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2answers
687 views

How do I determine solar panel amperage?

Complete newbie here guys so please bear with my question. I have bought 12W 6.6V solar panel that I will be using as phone charger. Beside that I have bought small USB solar controller which outputs ...
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1answer
133 views

Choosing solar panel - how many watts?

I have one solar related question, but please bare in mind that I am a complete newbie in this field so if my questions are stupid, I apologize. I want to use a solar panel with this USB controller/...
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1answer
66 views

Is connecting a grounding rod to the positive side of a battery wrong?

I have a 12 V battery being charged by a wind generator. The installation instructions show the grounding rod on the negative side. I have been having power issues with the batteries draining to ...
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2answers
106 views

Solar cell power output comparison without MPPT

I am interested in measuring the relative power output of a solar cell when it is placed behind glass and other materials. For example, one might guess that the cell's power output is reduced by 70% ...
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2answers
614 views

How can I run a 12v 19a pump with solar panels without using battery? [duplicate]

I have an water pump of 12v 19a৳ I want to run it with solar panels without using battery৳ I am ready to expend money to buy controller or othre parts৳ Note: At present i use a 12v 25a adaptor to ...
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317 views

Powering a 5v raspberry pi, a 12v motor and a 24v motor using 2 batteries charged with a solar panel

I want to control a 250W 24v motor, as well as a 12v 1W motor using a raspberry pi. It needs to all be powered by 2 lead acid batteries which are being charged when not in use. My plan is to use two ...
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3answers
107 views

Proper inverter VAC output when tied to grid

I live in a US state which encourages home-owners to install their own renewable system and feed the power back into the commercial grid. The inverters take their phase clock from the line and ...
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0answers
282 views

How to design a low voltage astable multivirator

I am currently trying to design a solar powered energy harvester. It requires a DC to DC boost converter to increase the output voltage and keep it regulated. I found that this can be achieved using ...
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1answer
63 views

Is my charge controller working like it's supposed to? [closed]

I have a Coleman 40w solar panel & charge controller to charge a 12v battery. The battery is a group 24 deep cycle with 85Ah lead-acid and works fine. My charge controller always shows "Charging"...
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1answer
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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70 views

Reasons for using separate sets of wires for the solar controller and the loads to the battery vs using a bus-type configuration

This has been discussed a few times, both here and on other sites, but the justifications given are usually very light. Here are a few examples that say that you should run separate sets of wires to ...
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4answers
4k views

Purpose of using diode with solar panel

I have been working on a design based on solar power. While browsing through some circuits on the Internet I came across these designs below In these designs, why was a diode added between the solar ...
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3answers
2k views

IEC 61000 vs IEC 61326? Electromagnetic compatibility(EMC)

I have been working on a product which requires EMC tested based on an IEC Standard. The product application is measurement and monitoring of various Solar String Parameters like voltage, current and ...
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2answers
831 views

How can these GPS/GPRS bike tracking locks be so power saving?

I am really puzzled by how these GPS/GPRS, solar-powered bicycle locks seem to be running on very little power. They are fitted with a tiny solar panel. As you may know, these locks are popular these ...
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1answer
1k views

Power inverter beeping [closed]

I have two batteries 12V/100Ah connected in parallel and a 500W inverter connected to them. The batteries are charged from PV panels through a charge controller. Although I connect a little device ...
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1answer
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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1answer
941 views

What happens if a 12V Thermo-Electric cooler / Peltier Module is supplied with 17-18v?

I'd like to connect a thermo-electric cooler to a power source that's actually being run from a solar panel to a 12V battery, and I'd like to tap the cooler module onto the leads for the solar panel ...
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0answers
276 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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1answer
264 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
166 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
137 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
3k 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
504 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
421 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
203 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
13k 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
214 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
190 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
297 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
436 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
240 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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0answers
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 ...