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

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3answers
67 views

Producing electricity from heat on a small scale?

Using a small solar panel like in the following picture we can produce around 0.935W of power with a peak voltage of 5.5V and current of 170mA under good sunny conditions Does a similar type of ...
0
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1answer
40 views

Safe LiPo Charging

When charging a lipo: Is there a max current you should recharge at? Does the protection circuit on the lipo correct for the amount of current that should be going into the battery? I'm looking at ...
0
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1answer
42 views

solar panel tilt depending on latitude

I'm attempting to calculate optimum solar panel tilts, and the best way to do this seems to be by latitude. However all i can find is calculators, i wish to be able to calculate this myself, is there ...
3
votes
1answer
32 views

Multiple charge controllers on the same solar panel

I have two 12v lead acid batteries on my boat. One at the front for the trolling motor (~80 AH) and 2 smaller batteries in parallel at the rear for electronics (~30-35 AH combined). I want to put a ...
0
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2answers
39 views

Can I charge two small batteries of different voltage using one solar panel and two diodes?

If I use diodes to direct power to each of two small batteries (old NiMH laptop packs), will both charge properly from a single solar panel at the same time if one pack is 11 Volt (9 NiMH cells in ...
0
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2answers
42 views

Solar Panel + Controller + Diode to float LiPos

I have a few solar panels I wanted to play around with and charge some 18650s till I get a little more comfortable that I won’t blow something up. My main goal is to understand how to charge ...
1
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1answer
75 views

How to calculate solar panel setup?

I have an equipment which draws 550W at a constant level, no peaks. I want to power this unit with solar cells only during the day when there is light using a simple car battery. Because I don't want ...
3
votes
0answers
34 views

Increasing 12V Rail current on power supply for mobile computing

I am building a miro-itx slimline pc for my mobile home that is powered by solar. I have selected a GPU with a rated TDP of 120 Watts and a CPU with a TDP of 53 Watts.I purchased a DC-DC buck ...
1
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1answer
52 views

Solar cell electrical model from datasheet

I would like to build an electrical model for a solar cell based on its datasheet specifications. As an example, I retrieved one from Digi-Key: ...
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0answers
6 views

Question about Solar Panel and Lithium charging board

I have a 6V 4.5W solar panel which I would like to use to charge my Lithium-Ion batteries. The battery chargin board accepts 4.5-5.5V. Would it still be safe to use it with 6V? If not, should I just ...
0
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1answer
28 views

PV cell output calculation, when a charging limiter is involved

I need to the charging rate of a battery connected to a 20w PV panel. Due to the regulator on the board though the maximum rate the battery can be charge at is 1A, 12V , due to how this is setup, ...
0
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0answers
35 views

Does connecting different solar panels in parallel affect total current? Are there any dangers? [duplicate]

I've posted this question on another forum as well but got no usable replies. I've done a lot of research but only found info about batteries in parallel, which says higher voltage will charge lower ...
1
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0answers
60 views

Can AC/DC conversion losses from solar panels be avoided with a Tesla Powerwall?

(background: I'm just playing with numbers, trying to estimate how many solar panels would be needed to fully supply the energy for a home and 2 Tesla cars) I've been reading up on solar panels and ...
0
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2answers
43 views

Arduino remove power if battery voltage is too low

I want to power my Arduino using a Lithium-Ion battery. When the battery is below 3.0V, the power to the Arduino should be disconnected, and when it rises high enough again is should be reconnected ...
2
votes
2answers
95 views

Preventing Arduino from getting lightning strikes and protecting it

I want to use an Arduino as a weather station and I want to put it high up in a tree. It should be independent and powered by solar panels. This is where the problem starts. Lightning strikes occur ...
0
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2answers
51 views

How to add solar DC output, Wind DC output and Fuel cell DC output to create a DC bus

How to add solar DC output, Wind DC output and Fuel cell DC output to create a DC bus. My doubt is, Is it possible to connect the outputs of different type of power sources(considering the DC voltage ...
0
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0answers
61 views

Building a solar powered USB charger

Can some one please help me ! I'm new to electronics and I have been building my own basic ones, but I have decided to step it up a little and design this. Could you tell me if it would work ? If ...
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votes
1answer
49 views

What tests, if any, can I execute to determine whether a PV panel has deteriorated?

So I'm possessed of an aged Photo-voltaic panel (around 15years) that came with a night-lamp. When placed in the sun here (21.17, 79.09) - on a sunny day the multimeter shows me as much as 11V from ...
-1
votes
3answers
62 views

Electricity needed to maintain power for camera [closed]

I am not an electrical engineer by any means and do not even know the terms I should use to ask this question but basically I am trying to determine which solar panel I can use to power my camera. ...
-1
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0answers
16 views

solar charging controller with main electricity charger [closed]

Should Solar charger controller (mppt or pwm) be switched off while charging batteries from main electricity? If Yes why? And how we manage this to be automatically and cheaply done?
0
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1answer
48 views

Charge Lithium-Ion batteries using a solar panel in parallel

I want to charge some Lithium-Ion batteries using a solar panel with this loading circuit found on ebay here. Apparently it works fine with just one Li-Ion battery, but I would like to extend the ...
0
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0answers
30 views

Using Lithium-Ion batteries for arduino

I want to know a couple of question regarding my upcoming project of powering a arduino using solar power. I want to use 2 5.5V 2.5W solar panels which charge Lithium Ion batteries. On this site here ...
0
votes
1answer
53 views

Build a solar panel nimh charger

Today I found this tutorial on how to build a battery/solar power supply for an arduino here. The tutorial explains on how to use NIMH or Lithium-Ion batteries for this. Step 4 explains how to use ...
2
votes
1answer
62 views

Solar powered single cell LiFePo4 charger circuit

As a follow-up to this question I've come up with this schematic for a solar powered battery charger: Subcircuits, from left to right: Solar cell (just a voltage source), 12V, 10W. Buck regulator ...
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0answers
33 views

Combining multiple solar chargers to increase output current?

Im looking to power an outdoor solar project that needs to power a 12v led light bulb @ 750 ma. I have a 12v step up regulator already, and was wondering if I could combine two of these inexpensive ...
0
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3answers
36 views

Hardware for testing MPPT algorithms

I have been working on an MPPT algorithm and I simulated on MATLAB , now I wish to test it practically.Can anyone suggest hardware or programmable MPPT charge controllers to which I can apply my ...
1
vote
1answer
105 views

Automatic Solar light far too dim, help with increasing brightness

simulate this circuit – Schematic created using CircuitLab I've built a simple circuit that uses a transistor to switch from charging 2AA batteries during the day to discharging the ...
2
votes
1answer
61 views

Solar powered charger circuit for a single LiFe cell

I'm looking for a solar powered charger circuit for a single LiFePo cell. The load is a low power MCU with some sensors attached, and when sufficient solar power is available, it should be used to ...
-1
votes
2answers
64 views

how long charge li- ion battery [closed]

I have \$3.7V\$ Li-ion battery \$3800mAh\$ and Solar panel \$U=5.5V, I_{max}=290mA\$. Battery will supply arduino with sensors taking \$100mA\$ current. How long will it take to charge the battery ...
0
votes
0answers
44 views

Handmade usb charger

I am a mechanical engineer and I don't have so many knowledge on electronics. I tried to make a solar charger . I had a 12v12ah battery,a solar panel 20w, a battery charger and a dc-dc converter ...
1
vote
3answers
80 views

How to power a 12V fan simply using a PV panel?

I am an electronics noob and I'd like to create some air circulation through my friends cellar using a salvaged 12V 0,8A brushless DC computer fan and a suitable PV panel. I have searched Ebay for 12V ...
0
votes
0answers
50 views

Could somebody check this circuit/components and size the resistors?

simulate this circuit – Schematic created using CircuitLab Could somebody please check this circuit/components and size the resistors for me? I'm trying to produce a variation of this: ...
0
votes
2answers
88 views

Trouble with Transistor Switch (2n3906)

simulate this circuit – Schematic created using CircuitLab I'm replicating a circuit found on evilmadscientist.com: the "detecting darkness" ...
1
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1answer
50 views

How to estimate solar panel output as a function of solar radiation

Apparently, according to EarthScience.SE, the measurement of how "bright" a given day is, is measured in units of kWh/m^2, known simply as "solar radiation". ...
0
votes
1answer
21 views

Sizing Photovolatic cells based on solar load

I'm designing a Photovolatic system to power up a certain electrical load (around 1000 Watts). I've just finished my solar calculations determining the optimum tilt angle and the optimum surface ...
0
votes
1answer
56 views

Need advice on my simple solar powered lighting system

I'm building a simple circuit in which a solar panel will charge a 12 V battery during the day and then switch over to battery power during at night to light up a few bulbs. I'm using an LDR which ...
0
votes
0answers
28 views

charge controller not disconnecting at full

When testing batteries and charge controllers I stumbled into something, this is what I found: 12V 100A battery charged using solar system with a charge controller in between, at 13.4V or ...
2
votes
1answer
139 views

Is the intensity of light shone onto a solar panel proportional to its power output?

Is there a linear relationship between the two? I ask because I'm investigating the effect of a different variable on the power output of a solar panel, and intensity is meant to be one of my control ...
1
vote
2answers
102 views

Capacitor Configuration

The block diagram below is for a simple use of a solar array in conjunction with a battery, in a battery tied bus format. The diagram is simple and straightforward excepting the capacitor ...
1
vote
1answer
35 views

Two voltage rails from one photovoltaic system

I'm working on designing a photovoltaic well water pumping system. I will have two 12V 120W PV panels connected in series, for a 24V 240W output (during full sunlight). Is it possible to connect a ...
0
votes
1answer
48 views

Simultaneous operation of inverter and diesel generator in a solar system

I have a problem at one of my on-grid solar system project. There is a problem which lets the solar inverter on, when the grid is off and the diesel generator is on. As you know that, the solar ...
0
votes
2answers
196 views

what size capacitor do i need to replace 4 3.7v 2400mah batteries?

I have a 5v 2amp external usb battery back that dis/charges 4 18650 vape style batteries. Each is 3.7v 2400mah. I took out the batteries and placed a 35v max 4700 capacitor in its place.. charges in 5 ...
0
votes
0answers
25 views

Help with solar panel/battery & load calculations

First solar project and I've been researching for a couple of days but still struggling with some basics. Trying to set up a simple 12v system, maintained by a solar panel. Solar Panel> Charge ...
0
votes
1answer
52 views

Charging a 36V battery set with a 255W solar panel

I have directly connected a 255W solar panel (with Vmpp of 49.5V but can peak at 56V in full sun at mid-day) to the 36V battery set of my golf cart. This seems to have been working fine for months, ...
0
votes
3answers
119 views

Batteries for solar application, why C10 only? [closed]

Some Solar PV system integrators in India are insisting on using C10 batteries only, which they have named solar batteries. In my view the selection of battery depends on charging source , ...
-1
votes
1answer
116 views

Can I run a 110v battery charger/maintainer off a solar panel?

I have a Batt Cat II battery charger/maintainer hooked up to the batteries on my boat. I keep it at a storage yard that doesn't have 110v outlets available. I was wondering if it is possible or ...
0
votes
1answer
100 views

pulse charging lead acid battries effects and side effects

I am developing a solar charger which charges lead acid batteries.I would like to clear a few of doubts on this issue. I am using IR2110 gate driver for driving 2 n-channel mosfets in an half bridge ...
0
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1answer
146 views

Charging two batteries with one solar panel

I have two batteries connected in series. However, I'm using it to separately get +12V supply and -12V supply. I have a 24V rated solar panel, and was wondering if it's possible to charge the two ...
0
votes
1answer
86 views

Solar Panel Charging with Arduino

I built a solar panel charge controller from instructables with an easy to read schematic and for some reason my battery charges up to a certain point and then loses charge again. That leads me to ask ...
0
votes
1answer
82 views

How to connect 3x200AH Batteries in my 24V System

I have the following components in my system: 1- a 24V inventer 2- 2x130w 12V PV connected in Series 3- 1x310w 24V PV Connected in parallel to make a 24V system 4- a 30A PWM Charge controller. ...