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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2 answers
28 views

How to find the C rating for a solar battery bank

I have 6 6 volt Intimidator 8AGC2M Group GC2 AGM batteries in series-parallel to make one battery bank that is ~13volts at 570ah. I'm using a Pico One battery monitor and it wants to know what the C5, ...
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2 answers
54 views

Directly powering a 3 VDC motor with a small solar panel

I am trying to power a DC motor directly using a solar panel. I measured the output DC voltage of the solar panel. It is well above 3 V in ambient light (3.8 to 4.5 VDC), but when I connect it to the ...
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35 views

Can I charge lead-acid batteries with more current than their rating?

I have a solar charge controller with these specs: Type: PWM-Type Solar Charge Controller, 30A, 12V/24V Battery type: DC 12V/24V (auto-detect) Charge current: 30A Discharge current: 30A USB output: ...
1 vote
1 answer
49 views

Why do I see a spike in this transient?

I'm trying to measure the V/I curve of a solar panel by recording a capacitor charge curve. Here is the circuit: The DC source and R4 simulate the solar panel (I know it's not an accurate model). An ...
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Solar IC BQ25798 battery charger

I am intending to implement a solar system that works on a single li-ion battery. I want my li-ion battery to power my device and the solar system to charge my Li-ion battery. Can I achieve this ...
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1 answer
73 views

INA219 load voltage stuck at 1 V

I’m using an INA219 and I’m trying to take a reading of voltage and current. When I’m looking at the current reading, it looks perfectly fine, however, the load voltage remains the same and it is ...
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Solar charging- battery overcharging due to resistance of path voltage drop

I am trying to implement Solar charging for cells using LT3652, as mentioned by one of their modal circuit The circuit works for multi-cell chemistry while charging till the VFB voltage reaches a ...
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2 answers
47 views

Boost converter and solar cells

I have a solar cell with 0.5 V and 3.5 A output. Will a boost converter lower the current and raise the voltage? I would like to lower the current to max. 1 A and raise the voltage to max. 22 V.
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2 answers
307 views

24 V solar panel gives half the current of a 12 V panel [closed]

I look at solar panels for sale and notice that a 12v 250w panel gives 13.9amps while a 24v 250w gives only 6.6amp. which is why I asked if the 24v would charge my batteries as efficiently as the 12v. ...
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1 answer
70 views

Maximize heat from a 12 V, 100 W solar panel and 26 AWG nichrome wire

I am heating a nonconducting material. The power source is connected directly to 12 guage copper wire. One 30 inch strand of 26 AWG nichrome 80 wire runs between the copper wire posts. Since sunlight ...
2 votes
1 answer
73 views

Testing solar charger board with a bench power supply

I have a solar charger wired up to charge a battery that powers an inverter, all on one board. I want to test the board before connecting it to the solar array that I have. I bought a bench supply ...
2 votes
0 answers
48 views

How can I modify this PCB "Solar lamp Mosquito Zapper"?

simulate this circuit – Schematic created using CircuitLab This is the PCB. This is a little schema The function is the solar cell charging the battery (2 x 1.2 V NiMH in parallel), and when ...
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0 answers
80 views

Are blocking diodes really needed for solar panels in parallel?

If one connects two technically identical solar panels in parallel (to increase current), many sources suggest to put each of the panels in series with a Schottky diode before joining these branches ...
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2 votes
2 answers
176 views

Very simple solar lithium charger (18650)

I need a very simple charger for 18650 LiPos (2.6Ah.) Since the solarcell (6V/150mA) will not be over the CC of the battery, I think only a precise 4.2V CV limiter will be sufficient. Has anybody ...
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60 views

Charging and discharging Li-ion cell dynamically

I intend to use an EBL 6F22 5400 mWh, 9 V Li-ion block as buffer for an USB-level solar charging station. It comes with a micro-USB charging slot and necessary voltage regulation. Not much can be ...
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1 answer
98 views

Is it dangerous to charge gadgets at less than 5 V?

I'm using a solar panel, which gives me unstable current (from 0 to 9 V approximately), then I use a step-up converter to increase te voltage a little (my goal is to keep it between 7 and 12 V in ...
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1 vote
1 answer
56 views

Powering Pico and stepper motor though solar panels

The main question: Should I power the motor and Pico with a separate set of solar panels or is it solvable in one circuit? Explanation: I am not a total beginner, but did not do electronics for about ...
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33 views

CN3065 - if VIN > 4.2V - stops charging?

I'm a noob working on a small project where I have the following setup: Small Solar Panel (1 W) <---> CN3065-based battery charger <---> 2 Ah Li-ion cell. The voltage of the solar panel ...
1 vote
1 answer
94 views

Can you connect a 12 V transformer and a 12 V solar cell in parallel?

I have a circuit that needs 12 V. I power it from a 12 V wall transformer. Could I save energy by connecting a 12 V solar cell in parallel, or would the transformer feed the solar cell when the sun is ...
0 votes
1 answer
80 views

Get 12 V stable output from solar connected 12 V battery

I have a 12 V monitor on my sailboat that only accepts a 5% voltage difference, so it needs between 11.4 V and 12.6 V input. Max draw is 1.5 amp according to spec. Here is a link to the user manual: ...
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1 answer
37 views

How to account for additional series resistance of SMU for characterising solar cells?

I have been building a source-measure unit based on a design similar to the DC2591A. I unfortunately cannot share the design, but largely it replicates the DC2591A using slightly different components ...
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1 answer
67 views

MPPT solar charge controller - battery charge current at MPP

I am currently planning to design an MPPT solar charge controller and I am trying to follow a reference design from TI - TIDA 010042. I am planning to use arduino as the microcontroller for this ...
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34 views

MPPT current limitation

I started to work on an MPPT project a couple of months ago. I have the first HW prototype (synchronous buck converter, current/voltage measurement, STM32 uC) and I am still fiddling with the SW side. ...
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2 answers
44 views

Photovoltaic solar cell attached to load device

I am new to the field of power electronics so please bear with me. From what I understand, photovoltaic cells are often connected to a DC/DC converter and a MPPT power system that allows for (1) ...
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1 answer
35 views

Is the total current of a solar cell the sum of the busbars?

I have many 5x5 inch solar cells with two busbars which I've attached tabbing wires to. This is my first attempt which is pretty poor I know (flux everywhere etc.) I'm measuring the short current ...
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2 answers
187 views

Can I use mains as backup for off-grid solar system?

I want to run 6 freezers/fridges (10kWh/day) with a 4kW array of solar panels, 4x 300Ah 12v LiFePO4 batteries, and a 2kW 12V Projecta Intelli-Wave Pure Sine Inverter. Instead of using a generator as ...
1 vote
2 answers
82 views

What is this solar path light component?

Just for fun and curiosity, I decided to reverse engineer an old, cheap solar path light. It's a fairly simple circuit, but there's a component I can't find any information on. It has transistor-style ...
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2 votes
1 answer
124 views

How to run a small water pump using a solar panel?

I have a solar panel: Output power 10 watts Operating voltage 12 volt I want to run a small water pump maybe 3W small submersible pump. How can I connect the pump with the solar panel? Someone said ...
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58 views

12V boat lead acid battery suddenly failed

Battery on boat and powered by solar panels started acting really weird suddenly exactly a week ago. App shows voltage went from minimum 12.3V to min 6V in a day. On board voltmeter showing 11.9-12.2 ...
1 vote
1 answer
89 views

MPPT input current measurement

I am currently working on building an MPPT, in a synchronous buck configuration. The HW side is almost done, I am still figuring out the current measurement and doing some tests to see how current ...
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1 answer
59 views

Combine DC sweep with time analysis?

I am working on LTSpice on a project which consists in transferring energy from a PV panel to a load through a transformer, using a controlled bridge at the primary and a diode rectifier at the ...
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1 vote
1 answer
83 views

If an IGBT's collector-emitter max voltage is 600 V, Do I need 1 kV rated capacitors on the output side?

I'm fixing this solar PV diverter (pictures attached at the bottom of this post), other than the traces it has a blown IGBT and 2 capacitors. The datasheet for the IGBT (model FGH40T65SPD) is here:  ...
5 votes
2 answers
155 views

Overvoltage Protection

I just destroyed my $1,500.00 wind turbine's battery charging module. I think I need a surge & overvoltage arrestor to add to my system to protect its replacement. We have a small family farm in ...
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Solar charger module for two NiMH in series

I have two 2450mAh NiMH batteries to be used to power an IOT project outdoors. I would like to charge the batteries with a solar panel, 5V, 1W. I have come across this module for which specs for 2 ...
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3 answers
145 views

Measuring voltages with different ground reference

Background I am working on a project where I have a solar panel connected to two battery chargers. One battery charger looks after an old car battery which powers some lights in my garage and a small ...
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-3 votes
1 answer
138 views

DC-DC Converter voltage drop on load [closed]

I bought a DC-DC converter to charge my devices with the 20V 1Amp current of my solar panel. I set it so it would convert to 5V but when I connect to load the voltage drops to 4.7V or less depending ...
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2 answers
107 views

Determine voltage and current for given I-V curve

Excuse me for my noob question, I'm new with solar panels. I'm trying to understand what value of current\voltage a charge controller gets in a given moment. Lets say that on given temperature and ...
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21 views

Solar charge controller

I have a question related to pwm charge controller .If I have 120W,22V PV pannel and i have to charge a 12.8V ,54Ah battery,which solar controller to use, pwm or MPPT?
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1 answer
92 views

Matching Solar Panel to TP4056 Charge Controller

I would like to match solar panel (6 V\1000 mA) to charge controller based TP4056 in order to charge 18650 battery around 3200 ...
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37 views

Using negative supply rail instead of ground in SMPS IC

I'm working on a solar power inverter I noticed that all PWM ICs using negative 12 rail as a gnd... As an example a PWM IC SG3524 which is used to convert batteries voltage to high dc bus voltage used ...
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1 answer
62 views

Boost converting 0.5V PV output to charge a super capacitor

I want to charge three 2.5V 700F super capacitors in series (7.5V total) to a precise 6V so that I avoid overcharging a single capacitor in the string. (Conservative 80% voltage to avoid having to ...
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2 answers
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If we change the PV panel, should we also change the MPPT controller block?

I have 6kw PV panel, in case of partial shading it's capacity reduces to 3kw. But, the MPPT tracker I designed it specifically for that 6kw rating, now because of partial shading the same MPPT tracker ...
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49 views

When I connect a battery, the system fails

I have a standalone PV system with boost converter using perturb and observe (P&O) as the MPP algorithm. The values of input, output capacitors, inductor are calculated correctly based upon a ...
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48 views

How to asses the performance of an MPPT algorithm?

I have a standalone pv system with PV Panel rating 6820W, a buck converter, 12V battery , DC resistance (load) of 8 ohm with Perturb and observe (P&O) as the control algorithm. Upon simulating, ...
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2 answers
54 views

Can anyone explain the role of some of these blocks in this PV inverter system?

I get the role of following blocks: 1)MPPT controller (is a matlab function code of Perturb and observe) 2)boost converter 3)H-bridge inverter and its PI controller. I don't get the role and working ...
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42 views

How to calculate the maximum load that a standalone PV system can handle?

I have a 6820W pv panel, a boost converter, a H-bridge inverter, a 48V 540Ah LI-ion battery, a 100ohm dc and a 100ohm ac load in my system. My question is what is the maximum load that this system can ...
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2 answers
80 views

IV curve has non zero current in open circuit condition

I have an IV measurement program running in LabVIEW, where I measure the IV curve of a photovoltaic module using a programmable electronic load from a quick backward sweep (from Voc to Isc.) I have a ...
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How to model solar photovoltaic array in spice?

This is the circuit I need to simulate in KiCad and ngspice. simulate this circuit – Schematic created using CircuitLab Can I encapsulate the above circuit into a variable in ngspice so that ...
-1 votes
1 answer
668 views

Do razor blades work as solar panels?

I want to know if there is any scientific background to the use of razor blades as solar panels. Would someone please explain how this composition of blades will generate electricity when put in ...
2 votes
2 answers
93 views

Is there a way to measure potential power output of photovoltaic panels?

Is there a way to measure the current power output of solar panels? I know how to measure voltage and current with an Arduino. What I don't know is how to measure the "unused potential power"...
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