# 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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466 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 ...
248 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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### 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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### 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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### Drawing energy from a 3.7V LiPo battery while simultaneously charging with a solar panel

I have a 200mAh 3.7V (0.7W) LiPo battery that I am looking to use as an energy source for a large model airship. I also have a 7.2V 100mA (0.72W) solar panel that I would like to use as a means of ...
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### 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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### 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 "...
1 vote
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### 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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### 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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### 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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### 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 ...
1 vote
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### 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 ...
1 vote
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### 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 ...
1 vote
54 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 ...
1 vote
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### How does a 90 watt fan consume power from a 500 watt solar panel?

I have a ceiling fan that consumes 90-watt energy. If I have a solar panel that generates 500-watt energy, then how does a 90-watt fan consumes only what it requires from a 500-watt solar panel.?
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### Connection question for Renology - order and possible converter needed?

I bought a Renology 100w solar panel with charge controller - and I see in the controller instructions booklet, "Never connect the solar panel array to the controller without a battery. Battery ...
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### Unexpected wattage into charge controller (solar panels)

I'm building a solar system w/ battery for my camper van. Two identical 110W panels wired in parallel, going into an MPPT charge controller and battery (a Yeti 1000 by Goal Zero, 96.8Ah (10.8V) ...
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### Designing split-phase grid-tie solar system

I'm in the process of designing and building a grid-tied solar power system, and had I'm having trouble finding a solar inverter that isn't MASSIVE (the smallest one I can find that meets my use cases ...
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### 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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### 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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### 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 ...
1 vote
77 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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### 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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### 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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### 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 ...
1 vote
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### 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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### 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 ...
1 vote
402 views

### How to model MPPT technique with PID controller

I need to model a MPPT algorithm with a PID controller at Simulink. The model will feed the gates of two mosfets of a push-pull converter. I have to extract max power from PV and have a fixed voltage(...
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### Outdoor versus indoor amourphous silicon solar cells

I've read in a few articles that amorphous silicon (a-Si) based solar cells have a greater spectral response for indoor light conditions here. If this is the case, then why manufacturers emphasize ...
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### 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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### 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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### 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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### 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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### 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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### 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 ...
1 vote
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### 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 ...
1 vote
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### 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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### 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 ...
1 vote
445 views

### How does the photovoltaic inverter synchronize with the grid?

My question is somewhat related to this one. Most of the 3 phase inverters used for photovoktaic (PV) on grid installations can work only if there is AC voltage present. After the AC voltage ...
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### Systems Engineering Solar Energy Diagrams

I'm currently taking a grad course in Systems Engineering. I'm dreading it a bit as I've taken grad math for the past 3 years and this is my first writing course in a while. We're covering context ...
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### Small vs large inverter efficiencies

I want to run a 60W device 24/7 through an inverter as efficiently as possible. I see that inverters become very inefficient at low loads relative to their capacity. Is this only because of factoring ...
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### Charging batteries with both an inverter and solar panels

I have an inverter, a battery bank, a PWM solar controller, and some solar panels. The inverter also supports charging the batteries from the mains power. So if I just plug the inverter into a wall ...
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### How to model solar photovoltaic array in spice?

This is the circuit I need to simulate in KiCad and ngspice. simulate this circuit – Schematic created using CircuitLab Can I encapsulate the above circuit into a variable in ngspice so that ...
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### Using an existing MPPT charge controller and solar panels with new battery pack

I have an off-grid setup at the moment to power most of my DC devices (bulb, router, NAS, NVR, etc.) I'm planning to upgrade my setup to a more powerful AC off-grid system to power my entire house. My ...
48 views

### Clear my confusion on PV or PQ nodes of power system with renewables?

A solar PV is connected to a node of the power system through a converter circuit. Is it possible to understand that the solar operating at maximum power point(MPP) be considered as a PQ node? or a PV ...
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### Using 210 V DC to a 220 V AC heater: is it going to work?

I'm considering building an off-grid solar system piece by piece. I can afford a couple of solar panels, after that an inverter, and finally batteries. I was thinking about finding a practical ...
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### 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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### 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 ...