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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54 views

Solar Cell DIY with Monocrystalline Silicon Wafer

I have recently interested in making my own solar cell Quick search on youtube, These 2 video apparently always be in #1 result for "solar cell diy" keyword or similar, https://www.youtube....
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78 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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44 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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21 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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44 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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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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36 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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28 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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36 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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45 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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52 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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44 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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25 views

Efficiency of the PV inverter

I'm doing a little university project in which I'm projecting a small PV plant of 50 kW. When I produce more power than my load need, I want to store the solar power inside the battery. Should I ...
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26 views

Solar not producing 24V all the time [duplicate]

We live in a moderately sunny place. We do get some cloudy days frequently. I have seen the output to go above 24V(like25V) on a fully sunny day middle of the day which means lots of days the solar ...
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60 views

Solar panel does not charge after lipo battery is low

I am trying to run arduino with solar panel, I have a project for farming so electrcity is problem. I need to use a independent energy. I bought Solar Power Manager 5V SKU DFR0559 and a 2000 mAh LiPo ...
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74 views

Solar panel output about 22 - 24V not charging batteries connected in series

I have an eco worthy 4 solar panels (2 * 12 connected in series and 2 * 24 connected in parallel). I can confirm that on a good sunny day output voltage from panels (measured on the red and black ...
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53 views

How to calculate energy from power I receive every 5 minutes

I have to calculate energy from power measurements, which I receive every 5 minutes. The values are summed and assigned to measurements, then monthly measurements and finally yearly measurements. ...
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1answer
42 views

Dividing current between inverter and relay

I want to make DIY ATS. My power supply is from 120Ah 12V battery. I have a 12V to 220 inverter and a relay circuit. My problem is the inverter doesn't supply 220V when it is in parallel with the ...
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1answer
48 views

Solar charger behind heat-reflecting windscreen

I am looking for help as my knowledge of solar charging (and apparently physics) is limited. I have a solar charger that plugs into the 12 V socket in the car. It's intended placement is on the ...
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49 views

Charging 40V battery with solar panels

I'm pretty new to solar panels and basically, I'm trying to charge a 40V 4Ahr lithium ion lawn mower battery using solar panels. 40V solar panels aren't nearly as common of a size as 12V so I'm ...
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1answer
44 views

Protect small DC motor from too much solar power

I'm setting up a hobby project where I have a DC motor running from a small solar panel. I've tested connecting the panel directly too the motor and it works great. The problem is that in bright light ...
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2answers
86 views

Safely measuring voltage from solar panels in an experimental research field

(Note: I asked this on https://engineering.stackexchange.com/ but I was told I should ask this here, so this is what I'm doing.) I'm installing solar panels (not connected to the grid) in units out in ...
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35 views

Solar charging a 18650 Battery ( MPPT vs TP4065 )

Most my solar project which includes ESP8266, a sensor and solar+ battery + MPPT charging module. In some tutorials I saw a use of TP4065 as in this tutorial While MPPT optimizes charge for varying ...
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35 views

12V Mobile Power Setup -

I am looking for feedback and experienced insight as I'm new to this world. I have a 12V 18Ah AGM battery connected to a 300W 110V pure sine wave inverter with the intention of running a 140W speaker ...
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33 views

reduce voltage for inverter in solar system

I have a solar system (solar panel, controller, battery and inverter). Battery have standby use 13.6-13.8V, cycle use 14.5-15V. I set the charging voltage to 13.8V. The problem is that inverter to 230 ...
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46 views

How to calculate how much current is available from Buck regulated Solar Panel

I'm trying to work out how much current my solar circuit could sustain under normal conditions. I have an monocrystalline solar panel claiming 5W @ 12V (17.8V Vmp, 5Wp) based on their data sheet. The ...
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1answer
50 views

What surge/lightning protection is needed for an elevated off-grid solar security system?

I have a semi-urban hunting location that I would like to monitor remotely. I have an elevated (~20ft) box blind I am installing off-grid solar system (specs below) in. The purpose is to power a small ...
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2answers
93 views

Powering a power bank with solar panels

Excuse my ignorance in electrical engineering, I am not familiar with the field. I am trying to power a power bank using solar power. I have settled on the following components: 4x 18V 2.5W Mini ...
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1answer
260 views

What happens to electricity generated in solar panel when no load is connected?

What happens to electricity generated in solar panel when no load is connected? How does it get dissipated?
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47 views

What is the main reason why solar inverters fail?

As I understand electrolytic capacitors fail eventually after some years of use. Is there something else that breaks down too? Because changing inverter just because its capacitors are gone is really ...
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31 views

Solar charging “12” volt nimh battery pack

So, I have 3 parallel 8-battery packs of nimh batteries wired in series - a total of 24 AA batteries. One battery is 1300 mah so I assume this should give me a total of 3900 mah. This gives me 9.6 ...
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70 views

Input Protection for a Solar powered Microcontroller project

We have a PV-powered remote sensing project that has not been as reliable as we had hoped. Servicing the device is a hassle, and most of the problems have been around the power supply. The present ...
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2answers
103 views

What should a 12v solar battery read while in use?

I have a 12v solar system with 2 12v batteries (One marine, other a car battery). My inverter has a minimum voltage input of 11.0v and peak of 15.0v, but when I'm running it under load, I get a ...
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48 views

How to disable battery charging in an inverter?

I installed solar retrofit to an already existing inverter battery setup. Now during daytime,inverter will be in battery discharge mode by converting DC from battery to AC for appliances use.While ...
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1answer
55 views

How do solar powered cars use the energy generated by the solar panels?

I want to know how companies who use solar panels on their cars utilise the energy generated by the solar panels. Do they charge the traction batteries with the solar power or do they power the ...
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1answer
45 views

Constant or variable current when using a solar charger?

I am looking at the CN3083 chip to charge a LiPo battery using a small solar panel (5V 0.15W). To set the charging current, the pin ISET is used with a fixed resistor, to set the constant charge ...
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1answer
53 views

PWM and MPPT charge controller on same solar panels

I have two identical solar panels in series that are connected to an MPPT controller (EPEver Tracer 1210A), which is currently charging two SLA batteries connected in parallel meant to power some ...
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2answers
102 views

PCB design, where to start? [closed]

I am working on a project that requires a power management board. I use a solar panel (or a wind turbine,) a battery and a Raspberry Pi that uses a 4G hat. I need a board that manages the power source,...
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24 views

How to measure inrush DC current in PV solar system?

I need to measure inrush DC current in PV solar system. Can I do that with a clamp meter?
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16 views

Specific solar circuit setup recommendation?

For a setup which uses: a 100Ah 12V battery (Absorbed gel mat Lead acid), with an MPPT solar charge controller, a 12V 12-55A DC electric motor as the primary load, additionally some 12V LED lights and ...
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93 views

Force voltage to 5V or 0V from solar panel

How can I ensure that a circuit powered with a solar panel will always receive 5V or 0V, but not something in between that would damage the circuit ? I have a linear voltage regulator that ensures the ...
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2answers
93 views

Using a KA75330ZTA voltage detector

I'm using a voltage detector for a solar powered ESP8266 project. Its purpose is to make sure that if for some reason the battery goes below a certain value (around 2.7v) then the MCU goes into "...
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2answers
59 views

Losses in solar electric system?

In a typical, simple solar power collector system (solar panels > battery > electric motor), what losses can be expected for a rated wattage of the panels to the charging of the battery? If a ...
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2answers
1k views

how to convert/calculate \$\text{kJ}/\text{m}^2\$ to \$\text{W}/\text{m}^2\$

I have some solar radiation data that comes in \$\text{kJ}/\text{m}^2\$. These data were formerly available for download in \$\text{W}/\text{m}^2\$. I tried to find some ways to do the conversion from ...
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6answers
4k views

Do power plants supply their own electricity?

I tried looking it up but there's no answer for this. This is mainly concerning nuclear power plants or natural gas plants, where they would have other buildings attached on site to operate the plants....
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80 views

Can you prove that electricity was generated by a photovoltaic cell?

I am wondering if it would be possible to build a photovoltaic cell that kept track of the electricity it generated (perhaps with a built-in meter), such that you could not trick the meter without ...
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85 views

Can I charge a 16V 16.6F supercapacitor with an 18V solar panel?

I'm working on my calculus project (I recently started college) and my topic is using solar panels and supercapacitors to help mitigate the lack of energy/electricity in the rural areas in my region. ...
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2answers
95 views

Need to limit current to maximum 1.6A

I need to build a current limiting circuit in order to protect a circuit board. It is for a solar power application. Currently the circuit board only can handle 1.6 amperes but the solar panels that ...
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1answer
49 views

Question regarding inductor peak voltage

I am trying to modulate an LED to simultaneously power a circuit and communicate with a small solar cell, but I have a question regarding a specific part of the circuit. I have simpified the problem ...

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