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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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43 views

Is it possible to power an electric appliance (e.g. Electric fan) by mutual inductance? [on hold]

In our research project we proposed if we connect a 12 V solar panel that is connected to a 12/220 V inverter so it would give us 220 V which is then connected to a transmitter to transmit power ...
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1answer
35 views

Using solar power on a dual inverter setup simultaneously, that share different parts of a series battery bank

I had an idea and wanted to present it here and ask if anyone foresees any problems with doing this... I have both a 48VDC input inverter and a 24VDC input inverter that I want to run from a 72V ...
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1answer
15 views

Solar Panels: Charge Batteries via MPPT Charge Controller *AND* Power PV-Direct Load At Same Time?

I have two 290 watt panels in series that are currently used to charge a 48V battery bank via a MPPT charge controller. The run from the panels to the charge controller and batteries is about 70', and ...
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2answers
71 views

How has solar panel power density improved recently

Im interested in how watt per kg has advanced over the past 10-20 years for consumer solar panels. Can anyone shed some light on this? A table would be great.
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0answers
38 views

Mini solar panel to DC motor

I have a mini solar panel 5.5 V 1 W 180 mA and I want to connect it to my DC motor 3-6 V. I tried directly but it didn't work. After some research I found that I needed a inverter. My question is: do ...
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1answer
31 views

Operating Voltage and Current of solar PV panel connected directly to a battery

Let's assume we have a 60 cell 260W PV panel with the following STC characteristics: Voc= 38.1V Isc=8.98A Vmpp=31.1V Impp=8.37A The panel is exposed to direct sun light and standard conditions are ...
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1answer
30 views

Is it necessary to cut off PV from grid before measuring its power output?

I need data of Power output from PV in one day. I was told to cut off the connection from PV to the grid also because the measurement is from the inverter, I also need to change the phase into 1 ...
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0answers
29 views

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 ...
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0answers
18 views

Bypassing solar charge controller using trickle charge voltage?

In an effort to simplify a small solar system and to keep the cost down, I am wondering what (if any) drawbacks there are to having the Vmp (voltage at maximum power) in a solar panel setup, at 12.5% ...
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1answer
57 views

Outdoor proximity sensor, triggering siren, powered by solar

My dog keeps jumping into our flower boxes and digging in them, destroying what we're trying to grow. After trying different things, my conclusion is that I need to scare her every time she jumps in ...
2
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0answers
62 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 ...
2
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1answer
167 views

Why Peukert's law is always ignored in battery(lead Acid) guides available on Internet?

I am doing battery calculations for off-grid solar panel. I don't get that why battery guides on Internet always ignore Peukert's Law for batteries of solar panel. I want to have good approximations ...
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1answer
26 views

Tapping power from series of solar panels

I'm developing a device that runs off 24V DC. I'll be installing it at a client's site who has arrays of solar panel, with 24 panels in series, making it a 1000V system. Can I tap one panel from the ...
1
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2answers
75 views

Mini solar panel not working

I have a very basic though unsolvable issue so far, I bought a (shitty) mini solar panel, outputting up to 6V and 1W (166mA), and I cant get it to work with the equipment I have or even measure any ...
0
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2answers
39 views

Solar panel with broken glass produces designated Voc but far less Isc Amperage

I have quite several 72 cells solar panels with cracked glass taking punch during the handling. The designated Voc is a little over 45V and almost all of the cracked solar panels (20pcs) generates Voc ...
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1answer
170 views

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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2answers
182 views

Battery bank system for a load of 1600 Watts

How many batteries of 12 V x 125 Ah needed to continuously run a load of 1600 Watts using an inverter of 24 VDC x 120 VAC that uses a battery bank as primary source? For a load of 1600 W , at least ...
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0answers
34 views

DC-DC boost converter to step up 120VDC to 300VDC to run Variable frequency drive

I have 4 numbers 300-watt solar panels whose open circuit voltage is 45vdc and max module voltage is 30vdc and max power current is 8.3A. now if we connect these 4 panels in series obviously we are ...
2
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2answers
56 views

Home solar system - COB LED Drive

Recently, I have installed an off-grid solar system - MPPT charge controller, batteries and solar panels. Overall the system provides a DC 12/24/36/48v power (60A Max). The main load I want to drive ...
2
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4answers
302 views

How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
5
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6answers
422 views

Can I use DC to drive underfloor heating wire?

I'm in the early phases of designing a new underfloor heating controller for retrofitting solar panels to locations with existing underfloor heating cables, which now take their power from the grid. ...
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0answers
34 views

Solar Power drops

I Have 8 Solar panels of Maximum Power: 300W, Working Current: 5.71A, Working Voltage: 36V. They are connected into series for 4 pair of two series. It used to be okay over months, but since last two ...
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2answers
96 views

Micro Watt Meter in Extreme Low Temperature [closed]

I'm using a solar panel in the Arctic and I want to measure the power it delivers to the associated sensors. Is there any recommendation on a watt meter for this environment? The temperature is ...
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1answer
77 views

Solutions for cooling solar panels [closed]

If someone wants to use solar energy in hot places, temperature is a problem. So, what's the solution for cooling the solar panel?
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1answer
72 views

Estimating the current consumption of a DC motor

Good day, I am wondering if it's possible to estimate the continuous current consumption of a DC motor vs startup or rated current. I am trying to put together a solar powered aquaponics system. The ...
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2answers
62 views

Cheap and simple way so switch on and off based on voltage, with hysteresis

I'm playing a lot with solar powered systems using ultracaps for energy storage. I'm also powering some small ~3.3V systems directly from LiFePO4 cells, charged by solar power. In both cases I'd like ...
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1answer
31 views

Recharging multiple batteries with solar panel

I have 1 solar panel: 7v, 1.5watt and 1.2v Ni-Mh batteries, 3000maH I am planning to use it to recharge my 1.2v batteries, I am not sure if i can charge 5 x 1.2v batteries using this solar panel. ...
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1answer
127 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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3answers
385 views

Resistor to limit maximum voltage of solar panels

I have two 20W solar panels (each Voc = 22.3, Isc = 1.22) in series connected directly to an axial fan driven by an EC motor (rated voltage 48V). Here the maximum operating voltage when very sunny has ...
0
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1answer
46 views

I have a 9v battery that is only needed to output power during night time/when the sun is down, how can i do this?

My main question is, am I able to use a solar panel to only allow power flow when it is dark outside?/When the Solar panel isn't receiving any light? What would the circuit for that look like? In the ...
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3answers
57 views

What could be the transmission loss per metre of using DC current for a low voltage solar system?

I think that it shouldn't be much but I wanted to get a ballpark numerical figure. We've installed a 2kW solar power unit at our home, which is installed on our rooftop. To convert the DC current ...
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2answers
109 views

Charge 5,4V supercap with 12V solar panel

I'm building a circuit to charge a series of two supercap (500F, 2.7V each) with a solar panel (wich outputs, not sc, 18V@1.5A with direct sunlight at 12pm). Those supercap will then power an esp8266 ...
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1answer
35 views

Can I combine the power of 2 solar panels with 12V dc barrel jacks?

I have two solar panels that both output to a 12V DC barrel jacks. I want to feed them into a power bank that has a female jack. Is there some way to feed the power of both panels to the input? ...
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2answers
64 views

Can I put batteries as checkpoints?

I'd like to make sure the voltage along a DC system of a building keeps stable. Consider I have the main power station with solar input current and main batteries. Can I put batteries in parallel ...
0
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1answer
43 views

Solar panel system - figuring out the right specifications

I'm building an off-grid security system, based on a smartphone as a 24/7 security cam and an arduino nano for several sensors. A pretty interesting build in my opinion, maybe I'll post about it ...
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2answers
110 views

How much energy is required to charge a battery to 50% vs 100%?

When I go hiking, I only recharge my phone to about 80% from my backup supply because I know it gets harder and harder to push more energy into a battery the closer it gets to full capacity. So I am ...
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1answer
42 views

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 ...
0
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1answer
38 views

Photovoltaic/solar power supply for Raspberry Pi [closed]

I want to build a power supply for my Raspberry Pi zero. It needs 5V and 2.5A (2A also working but only if 2.5A is not possible). I want to use solar cells to get the 5V and 2.5A. I have already ...
23
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2answers
4k views

Why does inverter synchronization with the grid take 5 minutes?

We had some solar panels & an inverter installed recently. Every time the inverter is turned on (after maintenance or with the first light of the day) it has to synchronize its generation phase ...
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2answers
139 views

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 ...
0
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1answer
46 views

Getting multiple Voltages from PV array

Sorry for the crude drawing I hope it explains the situation. Basically I have 12 pieces of 24v panels connected in 3 strings of 4 serial connected panels. My Open Circuit Voltage is 150V and I can ...
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2answers
349 views

Emitter-follower as regulator with low voltage difference

I'm trying to figure out emitter-follower voltage regulator for my solar panel. Panel outputs almost 7V on open circuit and 1.2A at short circuit. I want to use it as phone/powerbank charger -> 5V ...
0
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1answer
34 views

3-axis solar tracker design

Is it possible to design a 3-axis solar tracker using three stepper motors just like dual-axis solar tracker in which we use two stepper motors one for elevation and one for azimuth?
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2answers
70 views

Difference between monthly, daily and hourly solar radiation

I am currently modeling a solar tracker in MATLAB. But I am confuse about solar irradiance. Actually what is the difference between monthly, daily and hourly solar radiation? Which one is more ...
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3answers
204 views

Communication between BMS and PC via CAN/RS485 — where to start?

I am about to obtain BYD B-Box LV Residential battery for my off-grid solar system. The inverter I have is not on the list of compatible ones, which means (according to my local battery supplier) that ...
0
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1answer
88 views

Why solar cells have a wind speed meter?

I saw some solar cells in rooftop of a governmental office that were there for providing 220V Ac current for the office's lights and low consuming electrical devices. one of the cells had a wind speed ...
2
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1answer
107 views

Is there any technical/safety reason to ground off-grid solar?

Unlike this similar unanswered question I will keep this question here focused and specific. Imagine an off-grid solar system: panels, charge controller, battery, inverter, AC and DC appliances. ...
1
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1answer
40 views

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 ...
5
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3answers
163 views

Is it safe to run a PC fan with power low enough to stall it?

I have a "6V 4.5W" solar panel (Generic) and a 12V PC cooling fan (Evercool PWR-1225H12B) that consumes 450mA at 12V full speed. Running the fan directly from the solar panel in full sun works ...
1
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2answers
66 views

Maximum Power Point Tracking for multiple sources

I know there are several commercial products for maximum power point tracking for a single power source (solar cells for example). But does anyone know any solution for the case where there are ...