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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1answer
63 views

Storing solar panels in direct sun

What is the best way to store solar panels when not hooked to a charge controller in direct sun? I was thinking about hooking each panels pos and neg mc4 connectors to itself so it will not be ...
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34 views

Solar charger diy - question about voltage

Goodmorning everyone. I've recently made a usb solar charger, connecting a 10W 12V solar panel to a voltage regulator and then to a female usb cable. (The panel already has a blocking diode built in, ...
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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 ...
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1answer
58 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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3answers
82 views

Solar power backed circuit to light 1W LED

What I have achieved so far: Referring https://www.instructables.com/id/BUILD-A-NOCTURNAL-SOLAR-LIGHT-BULB/ , I have successfully built the solar garden light circuit to light a 5mm LED using ...
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1answer
50 views

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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42 views

Using Constant Current Power Supply to control Load Output of a Grid-Tie Inverter

tldr: How do I adjust the power being dumped by my grid tie inverter? Is it possible to use a constant-current power supply to do so? I am planning create a PV system that will help reduce my ...
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3answers
72 views

Problem with a relay decoupling voltage

I made a simple circuit to alternate its output between two inputs: a photovoltaic panel and a 12V DC voltage source. The schematic: The step source represents the photovoltaic panel and the two ...
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1answer
81 views

Is it possible to patch together a DC system with these random materials? [closed]

I have a small collection of random batteries and solar panels, plus two charge controllers. I am hoping to build a system which can charge devices like phone, tablet, portable power banks, etc. (...
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2answers
167 views

What is the best way to limit voltage of a solar panel? [closed]

I am using a 6V 6W solar panel with the Particle Boron microcontroller with a battery pack. I want to ensure that the voltage supplied by the solar panel does not surpass 6.2V, as that is the max ...
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72 views

How can I determine how much power my solar panel outputs during winter?

Hi I have a circular shape 7cm in diameter solar panel rated at 5.5V 80mA = 440mW. My question is how much power would it output on average during the winter when there is about 8 hours of day light? ...
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1answer
75 views

What to do with the excess of energy from a solar off grid system?

I have an off grid solar system and I'm playing with it with raspberry pi and arduino. I'm looking for an automatic usage of the 12V power produced when the battery is full. (arduino have sensor for ...
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45 views

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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4k views

Why are off grid solar setups only 12, 24, 48 VDC?

I am looking to produce 50kW for an off grid solar project. Ideally, I'd like to have a high voltage DC battery system with a high power battery inverter and charge controller. I have only found a ...
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1answer
29 views

Combining two power outs along with voltage regulator

I have two seperate solar panels with exact same circuitry connections. This is what I have: Solar panel -> Sparkfun Buck boost converter (set on 5v) -> TP4056 -> single 18650 AND + and - Power out ...
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5answers
90 views

How Can I connect My Solar Power System? [closed]

I brought this 50A Solar Controller now I want to connect an inverter to it and they said to connect the inverter directly to the battery. I also brought a 100W Solar Panel and MC4 Wires, etc What ...
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1answer
154 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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4answers
477 views

Is there a minimum amount of electricity that can be fed back into the grid? [closed]

This is not fully related to electrical engineering, but I have been reading lately about Feed-in-Tariffs and solar energy production and I cannot find any information on the amount of energy that can ...
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1answer
64 views

12V - How to activate an electric item if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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99 views

Is is safe to let my PWM charge my 12V battery at 14.8V?

I have a 12V battery linked to my solar panels. In the middle I have a PWM charge controller, that is configured by default to charge the battery if Voltage if lower than 14.8. At night, battery ...
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1answer
79 views

Can a solar inverter be damaged if installed capacity is much larger than demand?

I had a dispute with my fellow. In his opinion, a power inverter can be damaged if the load is much lower (e.g 100W) than installed capacity (e.g. 10kW) of the solar system. I am of the opinion that ...
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1answer
17 views

How are solar spectra simulators used and are they used to test photo-diodes and image sensors?

For example here is link to a Xenon lamp solar spectra simulator Xenon lamp AAA Class Solar Simulator. Two spectra are shown in the plot given in the link, one for the AM1.5G reference an other of ...
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1answer
106 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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3answers
90 views

What would be the most efficient way of wiring a solar power bicycle?

I have an electronic bicycle; 350 motor that runs off a 17.5 Ah battery at 36 volts. I've just ordered three 12 volt, 150 watt solar panels, that I'll wire in series to total 450 watts; giving 12.5 ...
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1answer
70 views

What's the benefit of 24V over 12V in solar and charging?

What are all the benefits of 24V solar systems over 12V solar systems in regards to solar panels and battery charging? All I've been able to find is that you can use smaller gauge wire with 24V, ...
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1answer
72 views

Mitigate voltage drops when using a relay

Hi and thank you for reading my question. I have a small experimental solar panel setup which charges a deep-cycle battery using an MPPT converter. I would like to power some garage and garden lights ...
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2answers
100 views

Please check my solar outlay for Lithium ion battery

I'm in the processes of 'solarising' my electric bike, and would appreciate a more experienced opinion on how I intend to do it. The motor is a 350W running off a 36 volt battery. I intend to get ...
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4answers
86 views

Solar cell outputs full voltage but barely any amps

So I've asked a similar question in the past, but I'm still curious about something. On a fully sunny day, the solar panel tops out at 5.5v @ 260 mA. On overcast or cloudy days, the voltage stays ...
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26 views

Measuring voltage on different grounds PV inverter

I'd like to create a voltage meter that can measure battery voltage and PV panel voltage. The only problem is that the PV input and Battery I/O doesn't share ground. I'm not sure if tying the grounds ...
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1answer
23 views

Using USB to supplement solar panel

I have a solar panel that outputs maximum 1.2W (7V, 0.17A). a 5V 1A USB power supply a 3.5-9V, 1-3W water pump. I'd like to have the water pump running all the time using power from (1) and (2), ...
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1answer
49 views

Solar panel and mppt / battery system advice

I got a free solar panel with specifications: Voc: 62.00 V Vmpp: 43.00 V Impp: 1.17 A My question is can I hook-up a 12V / 24V mppt charger and charge a 12V battery pack with no effort? If not, ...
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2answers
58 views

Off-grid solar system design

I saw many off-grid solar system designs are like this: ...
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5answers
379 views

Diode type with lowest drop voltage [duplicate]

I make a small solar energy harvester. I'm searching for the type of diode with lowest drop voltage. Any suggestion for the type of diode for me ? Thank you
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1answer
60 views

DC-DC converter not simulating correctly

I am trying to design a solar charge controller to charge a 12V battery, my solar panel is made of 9 cells that are 5W and 0.5V per-cell. I would like to make a booster circuit to get the voltage up ...
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1answer
31 views

Drawin max power out of solar panel by keeping its voltage constant

I wanna build a simple MPPT that keeps voltage on output of the solar panel constant. According to documentation, maximum power is drawn, when output voltage is about 4.2V. My way of reasoning is like ...
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48 views

Solar power pump - Design critique and help

Okay so, I have a design that 'works' on the breadboard. But I feel like it could use some improvement. Here is my current design: simulate this circuit – Schematic created using CircuitLab ...
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1answer
42 views

How can I combine 10 amp current from solar panel with power from the national grid?

I want 10 amp current into my load. I want my solar panel to provide as much as it can, but the remaining should come from national grid. How can I combine these two currents into one unified 10 amp ...
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1answer
37 views

PV Jacket Project [closed]

I was hoping to get some guidance on a project I am working. I am building a jacket which will have PV panels on it which will be used to power different types of loads. At the moment, I am lost with ...
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1answer
60 views

Solar panel array interference with DVB-T reception [closed]

We are looking to get solar panels installed, and also currently use DVB-T to get TV via antennas in our attic space. The solar company has suggested that the EMF from the panels/cabling will make ...
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24 views

Is there a Energy Harvesting Power Management and Battery Charging EVM dev kit (e.g. BQ25504) with easily adjustable voltage thresholds?

I have a BQ25504EVM-674 Energy Harvesting Power Management with Battery Charging (EHM) development board by Texas Instruments. It fulfills my requirement of charging an energy store (e.g. supercap/...
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57 views

Small solar power threatens grid TGFOV?

Can solar power systems under 10 kW, single phase, with micro-inverters pose a threat to grid reliability due to a threat from Transmission Ground Fault Over-Voltage? I have researched this topic ...
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1answer
98 views

Different Wattage Solar Panels for Home [different Voltage/Ampere]

My current solar system for home 12V 100W polycrystalline Solar Panel. 12V 75Ah Lead Acid solar tubular Battery. PWM 12V 10A Solar Charge Controller. 12V Input and 200VA Output Inverter. Current ...
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1answer
44 views

EV Car's battery voltage and charging with solar panel

How much is the voltage of electric car's batteries? I was thinking about a DIY electric van (Mercedes Sprinter) with 3x200 watts solar panels on the roof. I'm not sure but let's say the EV batteries ...
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2answers
47 views

Difference between Net metering, Feed-in tariff and power purchase agreement [closed]

I have been reading on wikipedia about the 3 different kinds of compensations, when it comes to renewable energy, however, the 3 types of compensation seem identical to me. If I have produced excess ...
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61 views

Why does reactive power change when a secondary source is connected?

When load was varying very little, PV supply was turned ON. Inverters used can give power factor(PF) in the range of [-0.8, -1] and [0.8, 1.0] Table 1 shows power requirement when only grid was ...
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4answers
234 views

Best practice: Should I charge a battery while also pulling load?

I have an off-grid solar panel setup. The solar panels send current to an MPPT charge controller. The charge controller controls current to a lead acid battery. On these same battery terminals I have ...
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2answers
42 views

Price and process of rewiring a bus to run from solar power? [closed]

I want to rewire an omnibus from running off of gasoline to running off of solar panels. Not my field. What are some things that would have to be done? Specifically, what would it entail to ...
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0answers
193 views

Is the duck (curve) still a duck? [closed]

In 2013 the California Independent System Operator (CAISO) published this image, dubbed it "the duck curve", and took the internet by storm (or, at least the part of the internet that tracks trends in ...
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1answer
271 views

Does a common neutral between solar inverter and utility affect current measurement?

I have solar hybrid inverter at home that's connected to the mains using both, the line and neutral wires. However, to save the costs, I've connected the load to it using a common neutral i.e. I've ...
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1answer
114 views

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 ...