Questions tagged [solar-cell]

Solid state electrical device that converts the energy of light directly into electricity by the photovoltaic effect.

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34 views

Solar charging problem [closed]

Ever since the batteries of a PWM 3 kW solar system were changed, charging remains on utility mains only and change-over to solar does not take place. What could be the problem?
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29 views

Keep running circuit while solar charging [closed]

I would like to build a simple automatic irrigation system with Raspberry Pi zero, the thing is that I don't have access to electricity outside. I thought to ...
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2answers
74 views

Solar-powered DC motor for mini fountain

I'm working on a small water fountain that's powered by solar panels, and I would love some help identifying a root cause for a water pump dying. This is my build so far: Water pump Solar panels I ...
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30 views

High Current SEPIC Converter (100 Amps, 800 Watts) [closed]

As I understand it, SEPIC converters are a possible means to connect a solar generator to an array of paralelly connected lead acid batteries. However, the peak current of the system is around 40 Amps ...
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36 views

Reduce Solar Panel Current

The specifiation of my solar panel are: Power = 80W Voltage = 5V Current = 16A How can I reduce the current to 8A by using resistor, what must be the value of my ...
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18 views

APFC C.T.Position [duplicate]

We installed on grid solar plant. Before installation P. F. was always maintained to 0.99 by capacitor banks(APFC panel). But after solar connection is varies and goes down up to 0.16. APFC panel CT ...
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33 views

Connect multiple MPPT charge controllers to a single solar panel?

I have a small 18V/80W solar panel and some old lead-acid UPS batteries (that I got for free). About half of them are one brand and the other half are another, so I don't want to connect them all in ...
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28 views

Need help with creating a schematic. LED off when charging, on when battery use

I'm new to the electric world and was wondering if someone with a bit of knowledge could help me out with a design. I'm trying to make a circuit that will have 2 LEDs on each side of the board. When a ...
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50 views

dead car battery charged using solar panel?

I have 12v calcuim+ battery was on my car but now it is almost dead (8.9v) I bough solar panel and charge controller to charge it. i put it in the sun for two days and now it is 10.5 volts but still ...
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45 views

Given a fixed area on a solar panel, at what point does adding cells in parallel not increase voltage?

Given a fixed space on a solar panel, all else equal, adding multiple cells in series increases the voltage (while current remains the same). For example, two cells equals 0.5v + 0.5v = 1v total ...
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2answers
26 views

Is there a difference in voltage/current between a solar panel with 36 individual cells or one big cell?

When wiring solar cells in parallel, the current is additive but the voltage remains the same. On the other hand, when wiring solar cells in series the voltage is additive, but the current remains the ...
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2answers
39 views

Whats the difference between a grid tie dc ac inverter and a normal dc ac inverter for 12 v or 24 v batteries?

what are technically the differences between a grid tie solar inverter, which takes as much power from the connected solar cells as possible, on the dc side, to convert it into 230v ac power and a ...
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20 views

Indoor / outdoor solar cell (Amorton): maximum light conditions

I am currently searching for a proper solar cell to power an IoT device (just a simple logging device). Although it is just for my own usage, the sensor should be properly engineered. My main ...
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43 views

Low voltage (self-oscillating) boost for solar powered pond pump

Long story shortened: I am currently designing a small filter for my pond using a small pump (6V-12V, upto 540mA) with UV-C LEDs parallel to it. Currently, it is battery powered (9V, 6x1.5V AA cells) ...
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1answer
54 views

Converting low volt (2.7), high amperage, (6) to a higher voltage at 90%+ efficiency

I have a solar panel set up which produces 2.7v at 6 amps and I want to increase that voltage to around 5-10 volts with reduced amperage at around a 90+% efficiency. The problem is that the voltage is ...
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1answer
26 views

Issue with my solar charger using LM2596

I am using a 20W solar panel, maximum voltage 21V & maximum current 1.23 A. I am using LM2596 to dtep-down to 5V to charge my powerbank, hich will later power my Nodemcu (ESP8266 board.) Issue in ...
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3answers
142 views

Which Source of Energy Comes First?

When there are multiple sources of power, how is it determined which one is used? or are they all split? Easy example is a grid tied solar system. If you have grid power in a breaker box and also ...
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30 views

Powering a max 360 W Ender 3 Pro with a 300 W inverter

I’m planning on powering the Ender 3 with a 200 W solar panel with a 300 W inverter. I saw on some posts that the Ender 3 draws 500-ish watts whilst starting up but then drops to an average of 150 - ...
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30 views

Can I cascade boost converters?

Can I cascade the boost converters, each converter input connected to input solar panel (48 Voc and 9A Isc), and the converter output is 110 V? What should I do to connect them in cascade?
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1answer
47 views

Solar Panel-Photocell Wiring

I am trying to help my dad with a project of his where were trying to build a lighthouse powered by solar panel in which it spins a motor at night and charges battery during the day. This is a DC ...
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15 views

unusually low power output on solar cell circuit setup

I am trying to trouble shoot a problem with a setup for a project I am trying to make. I would be grateful for any help. The circuit right now consists of just 8 solar cells, rated at 5V 1.1W (110*...
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1answer
67 views

12v wiring regulations (UK)?

What regulations (if any) do I need to follow if wiring a 12 volt system (in the UK). I was planning to wire up a garden shed / summer house to the 220v mains. I'm confident I could wire it safely ...
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5answers
70 views

120v Inverter and GFCI

I have a 48vdc to 120vac inverter with a 3 wire output (hot, neutral and ground). I installed a GFCI outlet using those output wires. I tried putting a resistor (I tested with 1k 100 and 22 ohm values)...
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45 views

Solar Li-Ion Charging with load-sharing

I need some help regarding my project. I have made a dog feeder with Arduino Uno, which is powered with a 3000mAh Li-Ion battery. I want the system to be charged with a solar panel (more solar panels ...
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1answer
69 views

DC converter use in solar cell MPPT

According to this project I saw many design use same principle by using MPPT to adjust PWM of buck converter. I totally get MPPT algorithms except the DC to DC converter part. Let's call solar panel ...
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1answer
35 views

Does solar cell absorb sub-bandgap photons?

My understanding is that although we are taught that solar cells only absorb photons of energy higher than the bandgap of the material, some of the sub-bandgap photons still gets absorbed, which is ...
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52 views

Solar powered TP4056 Lipo Charger burning

My project is to build a porch light which will run on a 3.7V Lipo battery, which is charged via 5V solar panel during the day. It has a PIR sensor and has a set timer to light a large LED once a ...
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2answers
64 views

DIY Computer UPS - Smoothing DPDT Relay 80ms Cutover

I was shopping for a small UPS for my home networking lab closet; total load under 300w at 120v. But then realized I have a spare AGM car battery, 12v solar panel maintainer and 12-120v sine wave ...
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1answer
43 views

How can I connect the mosfet driver?

I am trying to connect this mosfet driver: To this circuit with 2 Mosfet (I can't use IGBTs): I tried, but I don't know how to do it. I am doing the circuit with PSIM and I have to create all ...
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1answer
42 views

How can this high-side IGBT drive work without exceeding maximum Vg-e

I was reading an article that creates a device that model the I-V curve using on capacitive loads. In the article they using IGBTs to charge and discharge the capacitor. This is the circtuit that ...
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3answers
107 views

Can I use a mosfet to discharge quickly a capacitor without resistor?

I have to monitor a PV cell with a capacitor and to discharge I was thinking about using a mosfet whithout resistor to do it, whithout time constant. This, produce a short circuit when the discharge ...
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36 views

Improvements on a circuit that charges a battery from a solar cell

I am working on the circuit in the picture below. This circuit represents how to power a battery from a solar cell. I understand the logic behind the diagram but I was thinking what improvements to ...
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1answer
62 views

Wire Two 12v Batteries Together in Parallel With Solar Panel and Raspberry Pi

Please excuse my circuit below. I am a high school robotics teacher, self taught in electronics, so I may have used some incorrect symbols and configurations. I have a Raspberry Pi 3 that has a ...
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2answers
130 views

Why doesn't light destroy the PN junction voltage gradient in a solar cell?

I understand that a solar cell is, essentially, a P-N junction. A P-N junction, roughly speaking, will do the following: The free electrons on the N-side will flow over to fill holes on the P-side. ...
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1answer
62 views

how long will a 12V 5W solar panel take to charge a 12V 1.3Ah `lead acid battery

i wanted to know how long will it take for the 12V 5W solar panel to charge a 12V 1.3Ah battery. and also whats the maximum voltage that the panel can produce
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1answer
56 views

How do I work out the Inductor value on my a digitally controlled conventional boost converter

I’m trying to build a digitally controlled conventional boost converter and implementing a basic Maximum Power Point Tracking (MPPT) algorithm to extract the maximum possible power from the panel ...
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1answer
63 views

Why does shading a single PV panel in a series string reduce the current output of the whole string?

I would like to understand how shade on just one panel in a series string reduces the current output of the complete string.
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3answers
86 views

Solar panel voltage drop [closed]

I'm having a problem with my solar panels. I'm running a gecko 57l fridge out of a 100ah deep cycle battery with an 160w portable solar panels. The system works fine and it outputs 13.7v to charge the ...
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3answers
88 views

Ohms law in solar panel

When 2 solar panels are connected in series, the output voltage is sum of both panels but the output current (measured by short circuiting) is the same as single panel. What I dont understand is that ...
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1answer
44 views

Using small solar panels together, worth it?

I am messing around with some solar landscape lights to improve their capabilities. I have gutted their internal workings and replaced them with small neopixel light boards and connected them all ...
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1answer
46 views

Low voltage MPPT boost converter IC, constant input voltage

Following scenario: I have a bunch of Sunpower C50 unprocessed single solar cells. I'm trying to make a panel out of them for hiking. According to the datasheet each cell has 0.574 Vmpp an 5.65 Impp ...
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1answer
58 views

Can my solar inverter be significantly driving UP my power consumption or my meter counting excessive production as usage?

I've had a 1.5KWh PV solar system for 3 months now and as any new user I've been monitoring the power generation closely. I've wanted to correlate the power generation to my power usage so I've ...
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1answer
39 views

Solar -> Supercapacitor efficiency considerations

So, basically, using high voltage series solar-solar panel arrangements and a buck-converter to step down to 2.7V for a supercap array. Vs Using a parallel solarpanel arra with a voltage close to a ...
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1answer
73 views

Charge 12 V, 1.3 Ah lead acid battery via 12 V, 5 watt solar panel

Can someone explain me the below circuit which is used to charge 12 V 1.3 Ah lead acid battery via 12 V, 5 watt solar panel? The circuit is shown below I need to know what is happening in this ...
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2answers
46 views

Simultaneously Charge and Discharge a LiPo

I have what seems to be a rather common problem, a circuit in which i wish to be able to simultaneously charge and discharge (use) a LiPo battery. The "charge" going "into" the ...
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1answer
84 views

Grounding in a new solar setup

Currently I'm building the electric part in my converted RV. I got all components that I need and want to start to wire them now. But my biggest lack of understanding is the grounding part. The power ...
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31 views

Any suggestions on a small hydroponic system using a NiMH AAA rechargeable battery to run a pump & small PV cell to trickle charge battery?

Let me start off by saying I am in no way an engineer or electronics pro; merely an amateur/DIY-er and High School Physics & Biology teacher. I enjoy building things in my off time to both bring ...
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1answer
54 views

Why do solar panels need to be the same voltages when in parallel?

I have an off grid solar system which I reciently upgraded from 12v to 24v. I have two 12v solar panels which I put into series to boost the voltage to 24v (I will refer to this as a single 24v panel ...
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1answer
57 views

MPPT buck converter vs Ordinary buck converter?

I’m building a small arduino project which is going to be powered using a small solar panel setup with a battery as it’s UPS for power backup during the dark. The setup is going to be like Solar ...
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63 views

Need help with setting up Li-ion battery parameters in a Solar Charge Controller?

I am trying to set up the parameters for a LiFePO4 battery bank for a solar charge controller. I have tried to search the internet for understanding the parameters listed in the charge controller, but ...

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