Questions tagged [solar-charge-controller]

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Limiting the battery charging current / voltage using PWM or MPPT charge controller

I have a 12V, 200Ah lead acid tubular battery which I charge with solar panels using a PWM or MPPT charge controller. PV array specs are: ...
Irfan Latif's user avatar
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32 views

Victron Charge Controller with Amperage limit

I'm looking into charge controllers that have features to limit the charge rate of a battery. I've got a small battery bank, and only want to charge at say 10Amps max. It looks like many of the ...
2b77bee6-5445-4c77-b1eb-4df3e5's user avatar
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Repurpose APC UPS with Solar Panel as DC-AC Inverter, what changes needed

Firstly I have these items lying around, 330W 24V Solar Panel, APC Back-UPS Pro 1000VA/600W with dead battery Wanted to see if I can repurpose this UPS circuitry to utilize solar panel during day time ...
ezio16's user avatar
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Battery charging algorithm

I have designed my MPPT battery charger to a state and I have been able to generate the 14.4V charging voltage, with the 40Ah battery charged upto 14.4V during bulk charging stage and absorption mode ...
Peace's user avatar
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Is a charge controller supposed to first generate a voltage of 14.4V, before the battery is connected to start charging?

I am trying to design an MPPT charge controller based on an interleaved buck converter. Per my design, I use the present panel voltage to compute the duty cycle that first outputs 14.4 V which is ...
Peace's user avatar
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Solar system: 40 A DC AND fuses. What is the difference between Audio and Solar version of this fuse?

So, I've purchased some 40A ANL fuses and holders for my solar controllers and I'm hooking them up tonight after the sun goes down. Due to a comment from a neighbor, I went back and reviewed my ...
boatcoder's user avatar
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Where to place an LED to indicate the charging of a battery via a solar panel?

See the attached circuit diagram and PCB design. All I'd like to do is have a very small LED turn on when the panel is charging the battery. Circuit description: Q1, a PNP transistor ensures that when ...
Andrew Earl's user avatar
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Understanding the circuit 15 Ampere Solar Charge Controller without Microcontroller [closed]

I have a mini project I'm supposed to be doing for university. I've decided to build a charge controller. We aren't allowed to use micro-controllers, so I'm grateful I could find exactly what I need. ...
Olalekan Adekanmbi's user avatar
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27 views

Layout of a LiFePo battery pack with serial and parallel cells

Due to space I need to build a LiFePo battery pack with 8 individual cells. Each individual cell has 12V and 50 Ah, and the pack has to have 24V and 200 Ah. This would be the specific cell I plan on ...
Claudiu's user avatar
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1 answer
94 views

The complete circuit of this project [closed]

This circuit is a solar charge controller module Can you help me get the schematic and PCB of this circuit?
david olma's user avatar
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Why don't the panels backfeed the circuit in this 555 charge controller?

Source: Michael Davis Publishing (Mike's World) - A New & Improved Charge Controller Based on the 555 Chip In this circuit, the positive of the batteries and solar cells are shorted together when ...
Bren's user avatar
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Solar Powered Bilge Pump for Pool Heater

I am planning to build a swimming pool heater, using a solar panel to drive a bilge pump which circulates pool water through 1/2" x (2 x 60) m poly irrigation tube to heat swimming pool. Solar ...
Leon's user avatar
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2 votes
1 answer
138 views

Running a TV Using Only Solar Panel, Without a Battery

Objective I would like to power single 49 inch TV (LG 49LF6300) using only solar panel without a battery. I am aware that this will only keep the TV running for a few hours each day but this is not an ...
Chris Aung's user avatar
2 votes
2 answers
516 views

How much charging ripple voltage is allowed while charging a LiFePO4 battery?

We are designing a buck controller to charge a LiFePO4 battery (4 series 9 parallel cells, each of 3.2 V). Hence, we would like to charge the battery pack with 13.90 V but the buck output has got a ...
Vishal Jha's user avatar
1 vote
1 answer
50 views

Connecting a Pb battery back with a LiPo pack to combine maximum output power

I am working on my mountain cabin and am wiring it with some new electricity. In the long run, I want to switch to only LiPo based batteries but for now I still want to keep my old Pb batteries as a ...
h_uat's user avatar
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How can I control DC current into a battery charger using a microcontroller?

Apologies for the long question. Background I have a grid-tie solar setup at home with no battery. It exports unused power between 1-1000W at 250VAC when the sun is shining and we are not using all of ...
ThatDude's user avatar
1 vote
1 answer
113 views

Ender 3 with a battery powered backup

I wish to develop a battery powered power supply to provide uninterrupted power supply for long duration 3D prints in an environment where mains power is unreliable. A regular ups power supply would ...
Lampshades's user avatar
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1 answer
57 views

Low Power Lithium-ion Charge Protection

I have ~100 mAh 6 V solar cell that I want to use to charge 18650 lithium-ion battery. Purpose is to use a PIR sensor to turn on light when someone passes by, I am not very confident about the ...
asim's user avatar
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103 views

Lithium Ion Solar Battery Charger with current measurement

I have designed battery operated device. The current consumption is around 4ma. The battery which I use , is shown in following fig. the following schematic I have used to cutoff solar panel when ...
inventionClass's user avatar
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1 answer
164 views

My MPPT controller has same voltage in solar input and battery output [closed]

When I measure voltage in the solar input of my MPPT controller, it shows about the same voltage as the voltage of the battery output (about 12.3 V). Is this normal? The solar panels if not connected ...
maalls's user avatar
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How to wire 2 different sets of panels to the same battery bank

My question is how do I add 2 different sets of panels to the same battery bank? I'm currently trying to design a solar array that will fit my tiny RV. Ive worked out how to fit 790w on my lil rig ...
JT Tucker's user avatar
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0 answers
29 views

Charge one powerbank from multiple sources

I am in need of more power while traveling and for this purpose I will create a setup with one dynamo hub, one larger solar panel (30W) on the back of the bike and a smaller (10W) solar panel in front....
dobre dani's user avatar
2 votes
1 answer
107 views

Battery thermal protection circuit

I'm trying to design a circuit to be used with some 12V LiFePO4 battery packs which don't have an integrated heater, so I can add thermal protection. The circuit would sit between a 65W solar charge ...
davegravy's user avatar
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1 answer
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Buck converter - what to do with the rest of the duty cycle

I am looking into making a MPPT charge controller for some solar panels - I understand that it works on the basis of using buck converters to get the most efficient voltage to current ratio for the ...
Bren's user avatar
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126 views

Should the DC-DC and solar charging go through the main fuse or dedicated fuse?

I am planning a 12V dual battery setup to be used in a car. The aux battery is a LiFePo4 battery and it will be charged via a combined DC-DC and solar charger (50A, fuse 65A). I want to add a fuse and ...
Alex's user avatar
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1 answer
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Why won't my LT3652 circuit charge my Li-Ion battery pack?

This is a revision of a post from a few days ago. I'm currently working on designing a solar charge controller using the LT3652 chip that takes a solar panel input, charges a battery pack, and also ...
John G.'s user avatar
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0 votes
4 answers
220 views

What does it mean that an appliance has a power of 170W?

I would like to drive an appliance of 170W and 12V with a 12V 3W solar panel using an arduino nano. Given the a difference in the power of these 2 devices (170W and 3W), I don't know if this is ...
S.E.K.'s user avatar
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0 answers
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PV panel power logger

I am working on installing a solar panel to charge a battery, and would like to create a power logger for testing the output from the charging circuit. I have seen resources on the internet for using ...
nikola's user avatar
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1 vote
1 answer
83 views

Help with CR8F103K3 chip identification and datasheet

Recently I purchased a very cheap Chinese 10A 12/24v PWM solar charge controller to experiment with. From what I understand the PCB inside these devices are changing often and I've included more ...
Jonas's user avatar
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CV state lead-acid battery charge from solar panel

I simulate the charging of a lead-acid battery, using MPPT algorithms, Buck converter, a PID regulator and a solar panel. In the CC stage everything is perfect. The battery is charged up to 14.4V, so ...
vsa's user avatar
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0 votes
1 answer
36 views

Different load on series connected solar panels

I have a setup consisting of three solar panels connected in series, which supply power to a variable frequency drive (VFD) that runs a three-phase motor. I am planning to incorporate an MPPT (Maximum ...
Bilal Khan's user avatar
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1 answer
34 views

Are there MPPT solar chargers that can also do coulomb counting/current measuring or is that a separate function? (for NiMH)

Are there any MPPT solar chargers that can also do coulomb counting, or do you need a separate fuel gauge IC for that? I have been looking for a while and there is no proof that an IC even exists that ...
Matthew3302's user avatar
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0 answers
56 views

PWM Charge Controllers: Common types and example schematics?

I started on this quest because I needed to connect my programmable supply (KD3005P) 30V-5A to the PV input of a Landstar 1024B PWM Charge controller to test out the charging functionality of the ...
Zachary Anderson's user avatar
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1 answer
95 views

Charging batteries with multiple chargers

I have a 24v battery bank that has a 120v battery charger connected to it that runs when I run a generator. There's also solar panels connected to the output of the charger to help the batteries stay ...
joshua0823's user avatar
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1 answer
117 views

Alternate way to AC charge LiFePO4 pack

Firstly, I am aware that a similar question exists. That being said, I have built a portable power station comprised of a 24V 25Ah LiFePO4 battery in an 8S1P configuration. From this I am able to run ...
Shalan's user avatar
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0 answers
49 views

The most minimalistic solar charge controller possible: will it work?

I want to build a solar panels device that can supply power to my doorbell, which is installed over a gate with no access to wires or power. The gate has a "bar" on top where I can install ...
Filippo Possenti's user avatar
1 vote
1 answer
66 views

Looking for ways to combine the power outputs of different renewable energy sources

I've been researching ways of combining the outputs of different renewable energy sources (e.g. solar panels and DC rectified wind turbines) to provide a single output that could then be connected to ...
formerlolz's user avatar
2 votes
1 answer
124 views

Simple solar charger for SLA with Zener diodes

My electric fence unit stopped working, but it is a nice case with integrated solar panel and battery holder. I figured I could repurpose it as a rechargeable general purpose 6 V power supply. The ...
RogerParkinson's user avatar
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1 answer
61 views

Are these components safe to use together?

I am hoping that someone has some time to help me double check to make sure these components are safe to use together? Everything seems like it checks out, but I would really like to get a second ...
Wastelandbogeyman's user avatar
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1 answer
152 views

MPPT bulk charge voltage vs sealed lead acid battery fully charged voltage

I could do with some help making sure I understand some MPPT battery charging fundamentals. Been reading up on this but can't find anything that has made it 100% clear for me. An unloaded, fully ...
formerlolz's user avatar
2 votes
1 answer
265 views

Issues with voltage spikes on buck converter design

I am building a buck converter that I eventually plan on using in an MPPT charger. I have not taken any power electronics courses. Below is the spice model I’ve been using. The issue is that point A ...
restless_resistor's user avatar
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1 answer
158 views

Solar charge controller for lithium batteries

My project is a solar powered RC car with the ESP32. Currently, I´m looking for a solar charge controller. I have two solar panels that deliver 3,5W at 6V. I want to charge Li-Ion or LiPo batterys. I ...
NurDerFch1846's user avatar
0 votes
2 answers
400 views

Why does a sudden voltage drop happen when I connect a solar panel to a TP4506 module?

I am integrating a solar energy system to my smart greenhouse. The energy system will operate two 12 V, 0.2 A case fans (they draw a maximum of 0.5 A for maximum rpm) and a 5 V, 0.5 A mist maker. I’m ...
Belal Bahaa's user avatar
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1 answer
95 views

How can I use my two 33v solar panels to charge my two 12v trailer batteries while at same time providing 12v power to trailer?

Is it possible to have at least one battery connected to our trailer circuits while both batteries in series (ie. 24v) are being charged by our two 33v solar panels? Will solution require a "...
Doug Null's user avatar
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0 answers
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RCD in hybrid solar systems

Considering a hybrid solar systems that consists of: a hybrid inverter/charger that is also connected to the power grid batteries pv panels load. I would like to ask about RCDs. First of we should ...
Yiannis S.'s user avatar
4 votes
5 answers
1k views

Trouble with powering DC motors from solar panels and large capacitor

I'm working with a bunch of mechanical engineers on an electrical engineering project and we're totally stumped. The main problem is to drive a small robot chassis using the power generated from solar ...
Drew Fernandez's user avatar
2 votes
1 answer
168 views

Generic PWM solar charge controller signal flow - not as expected/assumed

I bought a cheap, generic PWM solar charge controller to test some solar panel and wind turbine ideas and decided to pull it out of its case so I could look at the PCB. I'd assumed the solar panel ...
formerlolz's user avatar
1 vote
2 answers
174 views

Low-voltage cut-off of solar panel supply

Context: I am developing a weather station to be deployed in 4 different remote locations. It is going to be powered off of 2 18650 cells in series. Currently, my power management module is comprised ...
Mário Ghio Neto's user avatar
2 votes
1 answer
125 views

Why does the MOSFET drain potential show this strong turn-off overshoot? How to fix it?

I am trying to build a PV charger (PWM), which I guess is kind of a buck converter. Below is a first LTSpice simulation. V1 are the PV modules, V3 is the battery. V2 is the microcontroller's supply ...
oliver's user avatar
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2 votes
1 answer
167 views

What happens when a CC/CV charger fails to give the required output voltage during CV charging and instead provides a lower constant voltage?

Lets say that I have a CC/CV charger based on buck topology and it is charging a 12V lead-acid battery through a solar panel. The lead acid-battery is being charged in CV (Constant Voltage) mode and ...
xrosaber's user avatar
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