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

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1answer
30 views

24v vs 48v solar inverter

I have 4 batteries of 150AH each. Earlier these were connected as series to 48v solar inverter of 3000 Watts, now as that old inverter is dead and I need to replace it with new one. I want to know ...
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0answers
36 views

Charging Nissan Leaf with Solar Panels? [on hold]

How Long will take charging Nissan Leaf If I Will Cover It with Solar Panels?
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0answers
32 views

Is this design with Linear's LT3652 an efficient solution?

Related question I'm designing a solar charger with Linear's LT3652. Specifically, I chose this open source board from Sparkfun, that has a fine documentation. The IC starts from Vin ≧ 7,50V so I ...
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6answers
80 views

capacitor with fridge

I have a tricky question for you. I'm trying to operate a 100w fridge using solar power, a car battery and an inverter. The inverter says that it's 2000w but it most likely seems that its a 700w but ...
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0answers
15 views

1-2kW solar voltage regulator cca 28.9V to 24V DC stable [on hold]

I've got several solar panels simillar to these http://www.solardesigntool.com/components/module-panel-solar/BP/984/BP3220T/specification-data-sheet.html Each panel is rated 28.9V 7.26A (max 210W) ...
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1answer
36 views

How is solar power consumed before grid power

This one has been on my mind for a while now... I recently installed rooftop solar panels with micro-inverters. While I was informed I would be using the solar power first, and any remaining needs ...
2
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0answers
33 views

PWM Solar Battery Charger for 192V battery

I bought a solar controller for my 192V solar system that did not work as advertised (instead of MPPT, works with ON-OFF cycles - Chinese ripoff - but that is offtopic).I want to redesign the control ...
2
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0answers
57 views

Using an automotive stereo capacitor for other uses

I am looking into using a capacitor to buffer voltage drops for a 12V solar power system. Since it seems I need a pretty big Farad number to give at least half a second of buffer time for my load, I ...
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0answers
37 views

SOLAR PANEL TO POWER EXTRACTOR FAN [on hold]

can I use the following to power a 12 watt extractor fan for my garage? This solar kit http://www.ebay.co.uk/itm/Portable-20W-Epoxy-Solar-Panel-Kit-W-PWM-10A-Controller-for-12V-Battery-Charge-/...
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0answers
30 views

modelling of solar cell: offset in short-circuit current

I am trying to simulate the IV curve of a solar cell in reverse and forward bias. I have used bishop equation that you can see in the following picture. The mathermatical model is in good ...
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2answers
42 views

Stepping up voltage from solar for a power brick (5V to 15V) possible?

i have a 28mAh power brick capable of charging my laptop when charged. I bought a 28W solar panel which outputs 5V over usb capable of charging ipads etc, however when i connected it to power brick's ...
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2answers
57 views

Small solar panel + ultracapacitor + zener

I am buliding a very small and low power "intermittent" sensor, powered by a tiny solar panel and an ultracapacitor. It works with a voltage from 1.9V to 3.3V, but the transmitted radio range greatly ...
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1answer
118 views

Can I just add cells to a solar panel to prevent voltage drop?

I have a solar panel which should be putting out 12.5v and 30 amps which has 100 solar cells, but I recently discovered it needs to be 17v or so because the voltage will drop. If I add 11 0.5 volt ...
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1answer
20 views

12v solar panel li-ion charger

I'm planning to use two 6v 0.6W solar panel in series to supply a cheap tp4056 module with builtin cell protection in order to charge a single li-ion battery. In order to regulate the voltage to 5v ...
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1answer
54 views

How to design a small solar panel and the respective li-ion battery charger IC?

I'm designing a small solar charger with these characteristics: Solar panel with 19% monocrystalline cells Voc = 7,50V Vmp = 6,00V (Voc -20%) Isc = 1,07A Wp = 6,42W IC Microchip MCP73871 linear ...
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0answers
27 views

Solar PV output

Having a solar panel rated 120W, 21.5V nominal open circuit voltage, 7.45A nominal short circuit current, 16.9V nominal maximum output voltage, 7.10A nominal maximum output current. When one wants to ...
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0answers
74 views

Can a solar charge controller prevent voltage drop?

I have a solar panel that is putting out 14 volts in direct sunlight. Whenever I apply a load the voltage drops to below 11 volts. Will adding a solar charge control keep the voltage at a continuous ...
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0answers
15 views

Arduino Robot motors disabled when analogInput is connected [migrated]

I have attached a solar panel to the Arduino Robot, connecting the - to the TK3 Input GND, and the + to the TK3 Input Analog Pin....
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0answers
26 views

How can I connect a phone charger circuit to a solar panel settup? (Pictures included)

Sorry if this question seems obvious, I'm new to electronics like many with this project. So I built a solar panel phone charger. I tried charging my phone and it seemed to stop the battery and phone,...
2
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1answer
74 views

Photodiode - Modes of Operation, Currents and Voltages

Problem Statement Consider a pin-Photodiode, whose depletion region, space charge profile and electric field profile can be visualized as follows (screenshot of the Semiconductor Applet Service by ...
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1answer
59 views

Why to use a Schottky diode instead of a normal diode on a solar panel?

I see all forums recommending using a Schottky diode instead of a "normal" 1N4007 diode on parallel with each solar panel cell. Why a Schottky? You don't need speed here. And the voltage drop is about ...
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0answers
36 views

How best to convert 47V/3A solar source to 5 V 0.5 A output for USB?

What's the best way to charge a USB battery pack (5 V, 0.5 A) from a 47 V, 3 A solar panel? Just a simple PWM or MPPT charge controller?
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0answers
16 views

PV array on simulink

So I'm working on a PV array project and I keep running into road blocks no matter what I do. I would like to be the last one I work one before making another one again. Here are the images im basing ...
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0answers
28 views

DC-DC step up and step down converter for a solar panel

I have a 1W solar panel that will output about from 0 to 7V (7V in full sun). I want to power up a small USB gadget with it. I need a device that is a step up converter when panel's voltage is under ...
0
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1answer
81 views

Solar energy system design and calculations to power a computer

I have a computer that uses a 500-Watt power supply. Note that this is a 500-watt power supply. How much power the computer actually uses, I don't know. 500-watt supplies are pretty typical. I think ...
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1answer
19 views

Charging starter and domestic battery with solar panel

I have two 12v domestic batteries connected in parallel and one 12v starter battery. Starter and domestic batteries are connected via negative pin to main switch which then connects to engine and ...
0
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1answer
75 views

Is it possible to damage phone battery when charging with a current source?

Is it possible to damage a phone battery when charging with a current source? Situation: I am currently busy with a project where we want to use 200 watt solar panel to charge as many phones as ...
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votes
1answer
72 views

Combining Solar Panels Safely

I have a solar panels, with 5v with a 200ma output, I have it so this goes to a charge module which allows 3.7v lithium batteries to charge without exploding on me. If i hook another solar panel, same ...
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0answers
51 views

YX805 Datasheet Translation

The YX905 T0-94 package accepts a solar cell, charges a 1.5V AA battery and lights up an LED when it is dark. I don't know how the light detection functionality works -- maybe it is when the voltage ...
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3answers
83 views

Power a 12 volt water pump from a 110 watt solar PV panel

I have a 12 volt DC 9 amp water pump that I would like to power from a 110 watt 12 volt (17.2 volt at peak) 6.4 amp solar PV panel. I only want to run the pump when the sun is out, it's circulating ...
0
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2answers
56 views

Can you use different Voltage and Amps to a charge phone? [duplicate]

If I buy a solar panel that outputs 18 Volts and between 250-300 mili-Amps will it charge my phone? I looked at the charger output for my phone and it is 5 Volts and 1 Amp. I know that Power (units ...
1
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3answers
108 views

Using capacitor as a rechargeable battery

As part of my learning of electronics, I'm currently trying to develop my own network of sensors. So far, I've managed to make myself a satisfying small setup : A few nodes, built with an ...
0
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1answer
59 views

How to use supply voltage for a small circuit from a huge variable power supply?

I have a 300 watt solar panel whose voltage and current need to be monitored by installing a device there. There is no source of power supply that I can use for this monitoring device but the solar ...
1
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1answer
49 views

Different voltage between the solar charge controller and the battery

I have a solar "box" project with a 10 W, 12 V panel and I noticed something when I was testing the battery voltage (two 12 V battery in parallel). When I measure the battery voltage directly from ...
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3answers
91 views

Solar panel without diodes

I have a 200 watt 12 volt solar panel. It has 3 diodes mounted on the back. Can you take the diodes out and the panel still operate normally in the day time?
0
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0answers
74 views

How to design a direct solar charger for 5v devices?

I'm searching high and low how to design a solar charger that charges directly small +5v devices. What I think that I need is: A boost converter (because I only have room for two uncut solar cells ...
2
votes
2answers
51 views

Estimate current produced by an IR photodiode on a typical sunny day

How can I estimate or calculate the current which would be generated by an infra-red photodiode (eg. Osram BPW 34 FAS) on a typical sunny day ?
6
votes
2answers
139 views

LEDs inside of solar-powered calculators

Why do a lot of solar-powered calculators contain red or infrared LEDs that are hidden from the user? So far I have only seen this in Texas Instruments calculators. Here are some examples of this in ...
3
votes
1answer
44 views

switching between solar input and 5V supply

I am designing an energy harvesting system from a low power solar panel. I am using the output of the solar panel to power a high efficiency boost converter which charges a single cell Lithium battery ...
0
votes
2answers
32 views

Solar Cell to trigger Solenoid

I would like to set up something where I use a miniature solar cell (like this) to power a push solenoid (something like this), so that when light hits the cell, the solenoid pushes. I know basically ...
1
vote
3answers
91 views

Detecting a break in continuity where no voltage drop occurs

I have a solar charger on a vehicle which I need to protect: Schematic is down there... The charger connects to the main battery, and the solar panel, but the manual specifically states that you MUST ...
0
votes
1answer
66 views

Solar panel charging circuit

Like so many else trying to charge a power bank from a solar panel: I've got a solar panel claiming 18V and 280 mA, so 5W and a 2800 mAh power bank expecting USB in so 5V 1A. The simple "circuit" I'...
0
votes
1answer
53 views

Divert excess PV energy to floor heating in off-grid cabin?

I'm building an off-grid summer cabin with a solar PV system. I'm planning on using this equipment: 3 kWp PV panels BlueSolar 150W/70A MPPT charge controller Victron Multiplus 3000W inverter 4 x 303 ...
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1answer
76 views

Can you explain how the following garden solar light circuit works?

I found the following circuit in a solar garden light. The cut off white and black wires are from the solar panel. What does the 4 pin transistor do?
0
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0answers
34 views

Simulink how to convert Duty Cycle to reference voltage signals(Uref)

In Simulink I am creating a DC-DC buck converter using Average-model based VSC Universal. But one input of VSC is in Uref. For this case I need to convert Duty Cycle (D) into Uref for Input. Because ...
0
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2answers
86 views

Why is my solar panel short circuit rating much higher than in reality?

I have two 6 volt 100mA solar panels. I have connected them in parallel and was expecting to see a maximum of 200ma when I short circuit it. As expected, I got 6 volts, but only 65ma. Does this always ...
0
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1answer
41 views

In a solar power system, when the panel is off, does the battery determine the wattage?

I am considering putting together a solar system to power my wireless router when the power goes out. I just have one question that I cannot find the answer to: Does the wattage of the solar panel ...
0
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2answers
73 views

Why a diode is in parallel with the current source in the equivalent circuit of a solar cell?

The model of a solar cell has a diode in parallel to the current source: (source) Why is the diode in parallel and not in series with the current source?
1
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1answer
24 views

PV array project

I am working on a PV array on simulink and I just need help on a math question. On the article I'm basing the model on, the model voltage equation is Vm = VmT - (5- G/0.2) for the voltage to vary ...
0
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1answer
61 views

Should I connect solar panels in series or parallel for my charger?

I am making a solar charger for 3 AA batteries. I have two 6 volt 100mah solar panels. Will it be more beneficial to connect them in parallel to have more current or in series to increase the voltage? ...