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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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29 views

Off grid System using on grid inverter [on hold]

Hello everyone can I use an ongrid inverter without grid using a microgrid? Also I want to know if there is access power then how would system handle it?
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1answer
24 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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43 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
40 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
36 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
58 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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0answers
23 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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0answers
37 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
41 views

Can I charge a Lithium ion call pack using solar panel? [on hold]

If I use a 10 watt - 12 volt solar panel (link), with a 10A solar charge controller (like this), can I charge a lithium battery pack? The lithium battery pack has total 6 batteries (each 3300mah) in ...
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0answers
25 views

Matlab off grid system

I am designing a solar standalone system. I have 2 PV connected conncted in parallel 270 watts for each. I need to convert the voltage coming from the 2 PV to 220-volt ac. In the output, The power ...
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1answer
67 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
42 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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19 views

Array Azimuth and Tilt Angle in solar system?

I got confused about these two angles. For my understanding the Array Azimuth is the angle of the array face that is measured from the north (clockwise ). I have a project on HelioScope which is ...
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2answers
42 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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0answers
57 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
130 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
38 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
175 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
58 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
54 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 ...
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1answer
56 views

Is MPPT of PV array possible if only converters are used and the connected load is a battery?

I am currently working on a project to harvest energy from solar PV panels. There are some difficulties that i am facing. I was able to achieve mppt using a constant resistive load with a converter. ...
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0answers
37 views

Powering refrigerator using solar inverter

I have got a 3 kVA (2400 watt) solar hybrid inverter (pure sine wave) which is connected to a 1280 watt PV array and 2 x 12 volt 150 Ah batteries. It is supposed to switch to utility mode if the ...
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1answer
45 views

How to measure available amps? Do i need more load?

My new 200W 18v 11a(max) solar panel reads about 24v 4a 50% efficiency at midday on my MTTP Rich solar controller. I presume this is not great. I was wondering... I have a 48v to 12v stepdown ...
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3answers
173 views

Lithium-ion battery charger circuit design [closed]

For my project I need to charge a 2s, 7.4V LiPo battery pack from an 18V 10W solar panel. This would not be an issue if I was able to use ICs such as the BQ2057WTS, but I am required to do design a ...
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0answers
16 views

Three disparate solar panels, two disparate charge controllers, one battery; can it be unified?

I have three disparate solar panels with the following properties (listed on panels or from instructions): 'Tall' panel: max power voltage 17.6V, max power current 1.14 A, max power 20W p +- 3% (...
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1answer
55 views

Battery Power Source for Wireless Router & Modem? [closed]

I only have access to electrical power via a generator for now, and need to continue to power the wireless router & cable modem even when the generator is out for a good part of the day or night. ...
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0answers
36 views

What is the 'right' way for a 3-Phase Watt Meter to determine import-export Watt-hours?

What is the correct way for a 3 Phase Watt-Hour meter to measure total import/export watt-hours? I ask because I have seen this done in 2 different ways both in 'approved' meters: Assume that: Red ...
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2answers
55 views

Van with Solar power but no auxillary battery and only on sunny days. Do I need switches and isolators?

I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator. Sitting on top of the battery I have a 1200 Watt pure sine 110v inverter connected ...
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0answers
62 views

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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1answer
36 views

Mixing wire gauge questions

I am putting a 50W 3.4A max 12V solar panel on my camper van. I want the option of removing it from my roof racks & mounting it remotely (so I can park in shade, but still have the panel in the ...
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2answers
772 views

How many solar panels would one need to carry to fully charge Tesla model S or S in 20 minutes?

Some would say carrying solar panels to charge a Tesla would be inefficient, and would take up all the space, however towing a trailer would. Solar panels plus inverter are also not that heavy. ...
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2answers
88 views

Solar panel as day/night switch for a load

I'm using off-the-shelf components to power a buck/boost LED driver and charge a battery from a 6V solar panel. To power the LED driver from the battery at dusk only, would I have to use a MOSFET ...
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0answers
24 views

Solar Panel Peak Power Tracking

I have a solar loader circuit where I only know that it handles "17 V Peak Power Tracking". Is this comparable with Maximum Power Point Tracking? Which voltage should the solar panel deliver?
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0answers
90 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
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0answers
51 views

How to calculate the current produced by a solar panel?

The equation for calculating current when given voltage and temperature is known as the 5-Parameter model ie. \$I = I_{ph} - I_o[\exp(\frac{V + R_sI}{nV_t})-1] - (\frac{V+R_sI}{R_{sh}})\$ Since this ...
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1answer
54 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
30 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
75 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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1answer
57 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
42 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
35 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
43 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
34 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
69 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
72 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
207 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
31 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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2answers
78 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
54 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
292 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 ...