Questions tagged [solar-cell]
Solid state electrical device that converts the energy of light directly into electricity by the photovoltaic effect.
-9
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0answers
39 views
Does solar pannel develop current [on hold]
I would like to know weather solar pannels and battery generate current the same way.
I am trying to replace the solar array with a battery bank will it fry the inverter electronics.The inverter ...
-1
votes
0answers
34 views
Failed to find LOD voltage regulator for IR2110 for driving two IRF540 mosfets :( [on hold]
I searched the entire internet for a LOD voltage regulator up to 1A for Vin 6V-37V coming from the solar panel and fixed output 15V for VCC and 5V for VDD. I have two IRF540 mosfets to be derived by ...
0
votes
0answers
48 views
12 battery with stepper to 30 or 30v battery [on hold]
I have 2, 50w COB LED they work 1.5A@30v
I'm thinking to go solar with them but i have a dilemma.
Should i invest in 12v batteries and panels and step up the voltage to 30v and have some waste or ...
-3
votes
1answer
60 views
I want to know how to charge my 48volt battery park
I have built a solar car by myself, but I can't let my battery get fully charged. I use four 12V batteries as a 48V battery, and I use 3 solar panels. Each have 19V, 18V at early morning and dusk, and ...
-2
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0answers
21 views
Hot water consumption data to make load profiles in excel [on hold]
I need data to make load profiles for hot water consumption for domestic purposes in excel(in Tasmania, Australia). The graph should be energy usage(KW) vs time(hourly, yearly). Also, I need a CSV ...
1
vote
0answers
20 views
Solar Cell Formula - I/V from Load Resistance
Background: I have the following simplified formula in a VisualBasic program that gives me current output (Icell) from variable input Volts (cellVoc) for a simple PV cell simulation.
By varying ...
1
vote
0answers
30 views
Protecting Copper Anode in 12V DC System
Getting to grips with cathodic protection here.
If someone had a 12, 24 or 48VDC system, say solar PV and batteries, and the battery negative is earthed, this means the earth is the cathode, and the ...
0
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0answers
13 views
Does MP2617H power management IC need an external regulator to supply “Vin” using a 12V solar panel?
I'm designing a LiPo battery charger using MP2617 power management IC. When I referred to the datasheet it tells that these ICs have an internally integrated voltage regulator for the battery charging....
0
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1answer
41 views
Correct way to ground components for solar panel measurement
I'm currently doing a project where I'm supposed to measure the current and the voltage from a solar panel and am unsure of how I should ground all the components in the circuit (since electrical ...
4
votes
1answer
47 views
Preventing overcharge of a SLA battery in a solar electric fence charger
I recently purchased a solar electric fence energizer, specifically the Patriot PS5. After it had been sitting in the sun a while, I noticed the battery was making a "gurgling" noise, which according ...
0
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0answers
39 views
connecting solar panels cells with copper adhesive foil
i have purchased some cheap solar panel cells , as am bad it soldering , so i was wondering that Is it good practice to connect solar panels with copper adhesive foil or bad , because with copper ...
2
votes
2answers
53 views
Trickle charging 10NiMh in series with ~1W solar panel
I have been put onto a project that needs to be powered by a small (1-2W) solar panel trickle charging a battery pack. The product will be located on rooftops. We have reviewed similar products and ...
2
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0answers
28 views
Advice for a Solar Charger and Battery Project
I am a high school robotics teacher (no formal engineering training) and I am taking a group of students to Kenya this summer to work with high school students there. The organization we are ...
0
votes
1answer
47 views
Can I charge this li-ion battery with this solar panel setup? [closed]
Since a couple years I've been messing around with a raspi and some motors. Building random stuff with dc-motors and such. I now want to power a self driving boat-robot with some solar power. For this ...
-1
votes
0answers
23 views
i want create a 9w solar panel bulb battery system
I have 6 pics 1.5 w solar panels.I want create a mini battary bulb system using them.what battary,led and charge controller i use?
please help me.Sorry for my bad english
1
vote
1answer
58 views
Floating DC power supply (solar panels) - do I need double-pole breakers and why?
I am in the process of building a small off-grid solar setup.
There will be 4 parallel strings of panels in this setup, and I understand that for 3 or more strings, you need some sort of over-current ...
2
votes
1answer
41 views
Using Diode As a Solar/Lightbulb Cell
...hi :)
a few days back I saw this Instructables..
https://www.instructables.com/id/Using-Diode-As-a-Solar-Cell/
...so I started to experiment how this can be used to charge a cellphone or a ...
0
votes
1answer
49 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 ...
0
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0answers
29 views
solar tracker slew drive end stop
I am designing a solar tracker and using a slew drive to rotate the panels from from east to west every day.
Now, I would like to install a sensor that can be used to determine and calibrate the ...
0
votes
1answer
47 views
Can I use a MPPT Solar Controller to charge my auxillary 12V AGM Battery from the car battery/alternator?
I have a RedArc solenoid and a Victron 75/15 Smart Solar Controller. Can I use the combination of these two units to charge an 12V AGM Deep Cycle auxiliary battery from the car battery/alternator ...
0
votes
0answers
27 views
Effect of solar PV leftover power on transformer? Will that power step up the transformer from secondary side?
I am trying to connect an ongrid inverter through a microgrid but that inverter takes a split phase supply due to which i have to develop split phase supply using transformers. Now my question is that ...
1
vote
3answers
125 views
Off grid LED solar lighting without batteries
I have 2 COB LEDs (12-14V DC, 50W, I think with 3,75 A in data sheet). I need to run them with a solar panel, it should only run when there is sunlight no batteries needed. Using a 270W panel (open ...
0
votes
1answer
37 views
Powering a microcontroller with a small solar cell and a capacitor
I'd like to power a microcontroller with a small solar cell. The idea is for the solar cell to charge a capacitor, and when a given voltage is reached, do some clever things to discharge the capacitor ...
2
votes
1answer
68 views
Strange voltage reading on ungrounded system
On a small scale off-grid PV project I received a strange voltage reading and I am hoping that some folks here could possibly shed some more light on what exactly was going on and why. Here is the ...
5
votes
4answers
501 views
Achieving MPPT of a solar panel with LM2596
im having some trouble with DC converters in a solar system.
I have a solar panel of 21V (Voc) and 1.33 (Isc).
I have studied that with a DC buck converter with input regulation (Feedback loop taken ...
3
votes
1answer
99 views
Minimum current for charging a battery
Recently I bought a 12V 200Ah battery for my solar system with 500W 18v (27A) solar panels. I find a label on the battery which is notice that the minimum charging current is 10% of the battery ...
0
votes
1answer
43 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 ...
1
vote
3answers
157 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 ...
0
votes
1answer
42 views
Prevent current backfeed without power loss
I have a solar panel and an external power source feeding into a DC converter (U10) that are both used to feed a battery charger (U2):
In a previous design I used 2 schottki diodes to prevent back ...
3
votes
1answer
69 views
Creating a temperature-dependent solar cell in LTSpice (using varistors)
I'm currently working on my master thesis and therefore need to simulate a solar cell in LTSpice.
I've already modeled and simulated some examples with constant values. But for a more accurate model, ...
0
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0answers
29 views
Temperature coefficient of GaAs cell
How can i find open circuit voltage/temperature coefficient and short circuit current/temperature coefficient of GaAs cell
0
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1answer
66 views
DIY Use 18650 in place of 18500
I got a (relatively inexpensive) SmartYard LED Solar Spotlight as a gift, and have been playing around with ideas to extend the battery life. It uses a 3"x5" solar panel, and comes with a 3.7V, ...
0
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0answers
49 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 ...
1
vote
1answer
43 views
Explanation of 5 Parameter Model for Solar Cells
I am having a hard time understanding this equation, the 5 Parameter model for photovoltaic cells.
\$I = I_{ph} - I_o[\exp(\frac{V + R_sI}{nV_t})-1] - (\frac{V+R_sI}{R_{sh}})\$
My goal is to apply a ...
0
votes
0answers
32 views
How does using PWM generator to control inverter work in Simulink?
I am trying to model a PV system connected to the grid and use PWM generator to synchronize the inverter output with the voltage condition on Grid.
I figure I need to use Three phase PWM Generator ...
0
votes
1answer
63 views
Extract AC current from AC/DC current generated by a solar module [closed]
I have a solar module with capacitance in nF range. There is an AC and DC current coming out from the module due to the incident DC and AC light. I would like to treat this like an AC/DC current ...
1
vote
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.
0
votes
1answer
47 views
Solar Powered Green House
I'm thinking of making a RaspberryPi solar powered smart "green house", with LED lights, water pumps and a few sensors. I would like to point out the "green house" would be about 6ftx2ftx2ft - more of ...
0
votes
1answer
208 views
DIY Solar lamp circuits with 5252F explained?
I have a bunch of solar panels, rechargeable batteries, 5252F circuits, inductors and LEDs and while reading https://artists.scitoys.com/three_volts that seems to be enough to make my own solar-...
0
votes
0answers
129 views
Solar Charge Controller with SMPS Power Supply
Hi,
I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
0
votes
1answer
58 views
9V instead of 3.7V 8.14WH
I have a solar charger which has a battery of 3.7V 8.14WH which is rechargeable. The battery was rechargeable but died. The charger wasn't working with the battery inside it, so I removed the battery ...
0
votes
1answer
39 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 ...
0
votes
1answer
106 views
12 V 3.8 A water pump to 12 V 625CCA battery
Wanting to use car battery to power pump. Pump says it's 12 V 3.8 A, uses a 8 A fuse. Trying to sort out possible solar input needed to run pump but the numbers don't make sense. What size solar panel ...
0
votes
1answer
26 views
Designing an effective extensible solar cell + car battery setup [closed]
I've got a cabin that I visit on weekends and because I need to charge my computer and tools there, I decided to bring an old car battery and bought a solar panel to charge it. Right now I use a cheap ...
0
votes
1answer
39 views
Solar variation tolerance for a solar panel
How to estimate average variation of input solar radiation that would be tolerable for a given solar panel? On what parameters will it depend?
0
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0answers
29 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% ...
0
votes
2answers
301 views
How can I use an LED driver (QX5252) to light up 3 different color LEDs (Green, Yellow, Purple)?
I am trying to light up 6 LEDs with the common garden light circuit (2v Solar panel and 1.2V battery). The problem is that I want to light up 2 yellow LEDs, 2 green LEDs, and 2 purple LEDs ...
0
votes
1answer
65 views
What is this solar power RC circuit doing?
I am a CSE student working on a project.
We are using a solar powered microcontroller. The solar panel's power goes through a fuse and an RC circuit with a varistor to the charging system.
What ...
0
votes
2answers
61 views
How do 24v or 48v solar/battery inverters provide power for houses that rely on 110v?
I've been learning about solar systems and I keep seeing that the systems feed power in to batteries, which is then fed in to the house via an inverter, typically 24v or 48v.
However, most houshold ...
0
votes
1answer
106 views
DC converters for solar cell
As we know, the voltage level of a solar cell is lower than what a rechargable battery needs, and thus a DC converter is placed in between.( With feedback control for optimum V-I curve)
This just ...
