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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 ...

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48 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 ...
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0answers
55 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 ...
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1answer
144 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
23 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 ...
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0answers
22 views

Solar PV inverter: Impact of an open circuit on other strings

I'm looking at the DC current data from a number of combiner boxes that are connected to the recombiner of a large inverter at a utility scale solar facility. I believe that I have a blown fuse in the ...
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2answers
73 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 ...
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2answers
38 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
128 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
172 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
27 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 ...
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2answers
51 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 ...
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0answers
33 views

What are the technical challenges in developing a battery-less off-grid solar PV system (solar panel + DC-DC converter with MPPT + Inverter + Load)? [duplicate]

I am trying to develop a battery-less off-grid power system. I know the obvious reasons for not deploying such a system; no backup at night etc. Also, I understand that current MPPT charge controller ...
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4answers
140 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 ...
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6answers
358 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
95 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
76 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
66 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
55 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
96 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
256 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 ...
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1answer
44 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
93 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
34 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
63 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 ...
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1answer
42 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
92 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 ...
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1answer
33 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 ...
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2answers
3k 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
124 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 ...
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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
244 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 ...
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1answer
30 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
68 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
163 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 ...
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1answer
74 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 ...
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1answer
94 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. ...
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1answer
39 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 ...
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3answers
150 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 ...
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0answers
27 views

Battery Pack Considerations for a backpack

I'm quite a newbie when it comes to hardware in general, so you've been warned :P I am trying to build a "modular battery pack" for my backpack, the rough idea is to be able to carry enough modules ...
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2answers
64 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 ...
3
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1answer
400 views

12V battery is now 10.5V but still producing a lot of power

I'd appreciate if someone can advise and give me an idea about the condition of my battery and my overall set-up. I set-up off grid solar system about 2 years ago, for my parents in my hometown ...
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0answers
27 views

How can I make an MPPT charge controller with database to get information about changing irradiance levels and the best V for each state

New to programming, I'm working on an MPPT project. I want to use the P&O algorithm but the issue of instability bothers me. I believe if the controller can be made smart, it'll be able to pick ...
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0answers
41 views

Harvesting energy from solar and “USB”

I'm designing circuit based on a microcontroller, powered by a solar cell. As an experiment, I wanted to add an energy harvesting IC (bq25504). When programming, I'd like to be able to charge the ...
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1answer
157 views

Does Solar powered ventilation systems for parked cars really work? [closed]

Do anyone have experience with the efficiency of air ventilation cooling systems for idle parked cars? I know some cars in the more expensive range (Mercs, and BMW's and some Toyota's) have a built ...
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1answer
41 views

Solar panel selection

I have a project being setup in my garden for an aeroponics system its basic components are: 1. Esp8266 2. Single channel relay board 3. Temperature & humidity sensor 4. 12v 3a - 100psi pump 5. 2 ...
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1answer
286 views

Can't Tesla Powerwall 2 draw DC from solar panels directly?

As one may know, Tesla Powerwall 2 comes in two versions: AC (with internal inverter) and DC. This question is about the DC version which comes with this coupling diagram: We know that solar panels ...