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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70 views

How much more efficient can solar panels become in the next five years? [closed]

I have been following the efficiency claims of solar panel manufacturers for the last 15 years. It seems it is stuck at around 20%. What is the main reason? What can we expect in next 5-10 years?
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54 views

How to factor roof angles and inverter efficiency in sizing a solar PV system?

I want to install a number of Mission Solar 420 W PV panels (pdf) on my roof. By estimating an average of 5 solar hours per day over the course of the year, I believe I need 9 kW of panels. So by a ...
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5answers
143 views

Can I use 10A multimeter to test 445 watts solar panel

I want to know if I can use a cheap multimeter, model DT-830D, which has a maximum current rating of 10A to test voltage and amperage of a 445 watt solar panel with the following characteristics: <...
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40 views

Can I use 24v solar panel to power 19v laptop

I have: 1 PV 24v/150w and a DC24V to DC19V 10A converter directly connected to the PV, can I use this equipment to charge my ...
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2answers
46 views

CN3722 solar controller does not stop charging

I have this custom PCB witha CN3722 module. I charge two 18650 batteries. Resistors XVR7 and XVR6 are calculated for 8.3 volts. The charger charges the batteries and the "done" LED turns on ...
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26 views

Solar Battery Charging Circuit

I designed this circuit: to charge my 12 V UPS battery from a 40 W, 18 V solar panel. I specifically included an LM317T adjustable voltage regulator to control the output voltage to about 13.4 V as ...
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70 views

How does solar PV modules array Power, Voltage in Series/Parallel affect maximum power efficiency

I have been struggling with my homework on my course (Solar PV Panels) today. Edit : PV Module parameters are below. These are for STC. In our case, it's 650 W/m^2 and 55°C. I have calculated IL and ...
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29 views

Grid-tied micro-inverters and lightning risk

Consider a roof-top solar generation plant. Usually here, a bunch of panels are connected in series to a "string" inverter. So, DC voltage goes up to hundreds of volts. I gather that this ...
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34 views

How do DC solar optimizers work in series?

Tigo and SolarEdge both have solar DC power optimizers. These have MPPT built in and optimize the panel. That is, the panel gis connected to them, then the optimizers are hooked up in series to each ...
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61 views

Switching large batteries between 12 V and 48 V connections

I have four 200 Ah batteries that I am using to drive two separate really high current loads. The first load is 12 V at around 400 A and the second is 48 V at around 120 A. I was wondering if I could ...
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37 views

Measuring voltage on different ground reference – PV

I have a small solar power installation and I want to monitor all the data from it. My only problem left is that the solar panel input doesn't have common ground with batteries (or atleast there isn't ...
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2answers
94 views

Wiring different amp hour batteries in parallel

Can I wire 2 lithium batteries of the same make but different amp hours in parallel? I need 300 Ah in my battery bank. Can I wire a 12 V 200 Ah lithium battery and a 12 V 100 Ah lithium battery in ...
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1answer
52 views

Running load directly off solar panels (bypassing charge controller) - Silicone heater

I am working on a solar setup that is powered by a Li-ion batteries. However, Li-Ion batteries can't be charged below 0 deg C, and thus if it dies in the winter, it will need to be warm before it can ...
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1answer
62 views

Efficiency of a solar cell

I am from Colombia where recently was opened a solar park with a power of 61 MW link to news I consulted the Solar radiation in the area and has a value of 5 kWh/m², the solar cell efficiency is 20%, ...
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2answers
74 views

Is it possible to setup a grid tied solar only PV system? [closed]

Is it possible to set up a grid tied solar only PV system? I can't have battery storage system because of budgetary reason. I have a school which have around 5kW load and I want to add an on-grid ...
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1answer
116 views

Parallel-series connection of an odd number of solar cells

I plan on having the following array in my system: Vmpp voltage at max. power point for each cell is 1.67 V Impp current at max. power point is 18.4 mA As the number of cells in the right "...
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2answers
80 views

How to combine three different DC voltages from solar arrays with voltages up to 360 V into one DC voltage for input into an inverter?

Possible solution: Convert each DC input into high frequency AC. Connect each AC voltage onto a separate primary winding of a toroidal transformer with one secondary winding. Supply to each primary ...
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42 views

Solar charging an Ebike

I would like to charge an Ebike battery (48 V) with solar panels (12 V out). I would prefer not to use inverter to 240 V (which current charger requires). Can I connect MPPT directly to EBike battery? ...
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3answers
173 views

Benefits of having one 12V 200Ah battery vs six 2V 200Ah batteries connected together since you're getting the same energy output?

Why would one choose to have 6 batteries of 2 V 200 Ah connected together in a series connection instead of a single 12 V 200 Ah battery or the other way round? From my calculations they all give you ...
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0answers
51 views

Building a hybrid ultra-capacitor and battery bank

I have a project that I need input on. Is it possible to build a hybrid bank out of ultra-capacitors (UC) and batteries? The generalized flow of the system I'm thinking is from solar (48V) to UCs (48V,...
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4answers
878 views

Using 500W to power a 4kW electric heating element

I have a 120 liter water heater powered by a 4kW heating element. I own two 350W solar panels totalling ~700W out of which I expect to reliably draw ~500W of power. I am looking for a way to take the ...
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1answer
61 views

12V power point socket keeps burning out, apparently from power surge

I have a simple solar power setup: 40 watt panel with built-in charge controller (https://www.canadiantire.ca/en/pdp/coleman-40w-folding-solar-panel-0112043p.0112043.html) 12V marine battery (https://...
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1answer
42 views

Solar MPPT, 24v deep-cycle battery wiring (Parallel and Series combined)

I'm asking here in case any of you can offer some insight, I have 4 x 110AH 12v Leisure deep-cycle lead-acid batteries; wires in series and parallel to bring the array voltage to 24v. I have 200w PV (...
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1answer
135 views

What diode do I use when charging 2 batteries in parallel?

I am a rank amateur in electronics, so please assist. I have a solar system (PV) charging 2 x 12v / 100Ah Lead Acid batteries for emergency lighting in my house (Max charge 13.8v). I also have an ...
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1answer
67 views

PV voltage spike causing charge power to drop randomly

Need some help with an issue. I have a MUST 5 kW hybrid inverter (this is probably a Voltronic white labelled inverter) and its MPPT range is 64-130 V, 9 x 375 W Fivestar solar panels connected with 3 ...
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2answers
57 views

Is it a good idea to charge multiple Li-Ion batteries using a single buck converter?

I am trying to implement a DIY MPPT into my solar tracker project and I wanted to know if it was possible to charge all of the three li-ion 3.7v batteries in series with just one feedback buck ...
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1answer
31 views

PV operation points due to load changes

I couldn't find anywhere what happens to the operation point of a PV cell, when, a resistance (load) connected straight up its output, changes (step) from one value to another. With other words, ...
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8answers
3k views

Do solar inverters dump excess generated energy as heat?

I have a off-grid solar system and it got me curious, how is my inverter able to know how much excess energy is being produced? I could not show the actual graph from the app but it's really close to ...
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2answers
629 views

Can I use a 10W solar panel to charge a 6V battery?

I got a 10W 17.5V 0.58A solar panel which I intend to charge a 6V battery to power up my components. I was thinking of using the panel to charge a 6V 4AH battery. I read online saying that to charge , ...
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40 views

Solar System Grounding

Solar panels and structure should be grounded to DC or AC? Inverter chassis/body should be grounded to AC or DC?
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1answer
34 views

SolarPanel Calcuation For Laptop

I am having some trouble understanding if I am doing my calculations correctly when trying to calculate the battery size / solar panel wattage for our RV. I started off small by just calculating for ...
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1answer
45 views

How to calculate energy added to grid using active and reactive power?

I have recently installed solar system that adds energy to the grid. My utility company has installed bi-directional meter at my place to record energy consumed as well as energy added to the grid. ...
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1answer
57 views

If I had 2xUSBA @2.4A/ea. but only 4A max output from 21W solar panel, would joining the usb cable leads together give me one safe a 5v/4A output?

Mission-Solar fast charge? If I had a 21W solar panel with 2 USBA/2.4A or 4A max outs, could I simply strip and match leads to form one USBC input to a USBC input on a Poweradd PD 30W Power bank and ...
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1answer
46 views

Solar tracking using a helicopter blade control [closed]

I've been trying to build a dual-axis solar tracker but the ones I saw needed linear actuators. I'm thinking how about using SG100 servos with the concept of blade control in helicopters to build the ...
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1answer
104 views

Off-grid solar panel setup for estimated 15kWh daily consumption

I am planning to setup an off-grid solar panel system. I've read Off-grid solar setup, but I am looking for clarification on my understanding on how to go about it in the most cost-efficient way. I ...
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2answers
170 views

Solar inverter shuts down when refrigerator is connected and utilities shut down

I'm not an electric engineer so apologize if the description is incorrect. So we recently got solar panels set up (1680 W, 280x6) with two 12 V 130 Ah batteries and a 2.5 kW inverter. The system ...
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1answer
177 views

Is there a linear relationship between energy production and global horizontal irradiance?

I'm an apprentice in data science. I am currently working in a company that produces and installs energy storage systems. One of the clients of this company wants to estimate the loss due to the ...
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1answer
91 views

Solar cell DIY with monocrystalline silicon wafer

I would like to make my own solar cell- From a quick search on youtube, these 2 videos are apparently always the #1 result for "solar cell diy" keyword or similar: Video 1 Video 2 The ...
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1answer
80 views

How bad of an idea is it In an emergency to use my PV solar and propane generator together?

Set the stage: Say there is a massive grid disruption like what happened to Puerto Rico after Hurricane Maria. I live somewhere were air conditioning may be needed for some groups to remain healthy. I ...
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50 views

solar charging lithium batteries in cold environment

I'm trying to devise a strategy to allow my system to run off lithium batteries. From what I understand charging a lithium in freezing temperatures is a big no-no, and my project will face these ...
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1answer
26 views

connecting PV cells for different applications

PV cells are connected either in series, parallel or a combination of the two. There are some obvious reasons as to why this might be done for example to achieve different currents, voltages and shade ...
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106 views

Have I missed anything? Will this end in flames?

Hoping to get some eyes over my wiring diagram for my transit minibus conversion. It's a 2015 Transit and i'm about to start running some cables. Electrics are new to me and i've spent a fair while ...
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1answer
47 views

Is there a measurable increase in the output of solar panels during the solar maximum?

During the solar maximum do solar panels benefit from a measurable increase in power output? Clouds and weather conditions certainly contribute to ups and downs in power output, but on average do we ...
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1answer
75 views

Review this solar-powered weather station schematic?

It's my first time designing a schematic in EDA (or at all really) and I'd love a review of this schematic to point out any silly general circuit mistakes I might be making. Not looking to dive into ...
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75 views

Solar Inverter makes 15kHz noise at ~70dB when running

I have a solar power setup with an array of panels running to an inverter, which is connected to a set of batteries and to two other devices for monitoring the net metering, power output, and so on. ...
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40 views

Separating DC Cables and Communication Cables in the same trunking (Solar Installation)

There is an upcoming project which requires me to install the communication cables together with the DC cables for the PV modules. Each of the PV modules will have an additional communication device ...
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1answer
41 views

Relay Switching On and Off Rapidly During High Current Draw

I am building a solar pool heater using a solar panel to power bilge pumps that push water through irrigation pipes. When there's enough sun to get the panels to its typical voltage (~21.6V 6.16A) but ...
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1answer
47 views

Solar system design: Inverter keep tripping problem [closed]

What is the problem when my 2kW pressure washer can only use for 3 to 5 minutes? The inverter drop to 50v and then tripped. My solar system consist of 48v 200Ah battery bank with 3000w inverter (48v ...
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53 views

Are PV panels convenient without incentives?

I finally finished a project in which I designed a 55 kW of PV system for a 50 kW load and I finally calculate costs and revenues over 20 years. I found that with a 25% of incentives for the cost of ...
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1answer
48 views

Power consumption of an inverter

I want to calculate the consumption of a PV inverter connected to a 50 kW PV plant. In the datasheet of the inverter it is written that the consumption of the inverter is: < 0.24% of Pac,r. I ...

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