Questions tagged [solar-charge-controller]

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81 views

Question about setting the MPPT on BQ24650

I have a question about the MPPT in BQ24650 chip. It has the MPPTSET pin that need to get 1.2v because the inside comparator. According to the datasheet, on ...
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1answer
80 views

Is off grid solar setup limited by battery charging current?

This question is strictly regarding off grid solar power setup, using PV panel, MPPT Charge controller, battery and an inverter to convert DC to AC. Am I limited by the input charging current a lead ...
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1answer
48 views

Drawing energy from a 3.7V LiPo battery while simultaneously charging with a solar panel

I have a 200mAh 3.7V (0.7W) LiPo battery that I am looking to use as an energy source for a large model airship. I also have a 7.2V 100mA (0.72W) solar panel that I would like to use as a means of ...
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2answers
80 views

MPPT power balance constraints [closed]

I am implementing an MPPT controller with a battery charging controller to charge a lead acid battery. The question has to do with my understanding of how MPPT works. From what I understand is that ...
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0answers
44 views

Wiring an automatic solar light for a tiny library

I want to add a light that comes on when you open the door to my tiny library that's powered by a small solar panel. I'm no electrical expert but I do know basics enough to make simple circuits. My ...
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18 views

Can I run a charger and inverter in parallel on solar?

Currently I have about 4.5kw in solar running to an inverter. The inverter is energy saving only, so when the grid goes out (it does frequently) I have no power. I just want to keep some basic ...
1
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1answer
105 views

Lead acid battery charging @ 0.2C

I am charging a 26 Ah battery with a solar charge controller. The battery's manufacturer recommends charging with 0.1C. Which charges the battery at 2.6A during bulk mode. That is what I was going to ...
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2answers
96 views

Matching solar panel to charging controller

I hope its not a silly question but ill ask any way :) I would like to connect a 9v solar panel to charging controller. The input range according to it's data sheet is 7.5v to 28v. The output of the ...
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2answers
94 views

Can I use the same electrical ground for everything in a van?

I have the following setup in my van . BAT1 is the battery in the front of the van which was build in. It is being charged by the alternator while the car engine is running. This also turns on the 12V ...
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0answers
23 views

Arc observing while connecting battery to charge controller

I have a solar system as shown below diagram. When I am trying to connect the battery terminals to charge controller, immediately a spark/arc is observing. Does this because of some capacitor getting ...
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4answers
491 views

Understanding working of MPPT charger

I am trying to understand working of MPPT charger for LiPo battery (3.7V nominal) and 6V 2W solar ‎panel so that I can select right charger for my project. After searching and reading lot of related ...
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1answer
94 views

Some questions about the CN3722 solar charging IC and its MPPT setting

I'm currently working on a project, where I have to charge batteries by solar. For this reason I chose the CN3722 IC. Since I want to create my own PCB with all the necessary parts I had to read the ...
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1answer
76 views

Unexpected wattage into charge controller (solar panels)

I'm building a solar system w/ battery for my camper van. Two identical 110W panels wired in parallel, going into an MPPT charge controller and battery (a Yeti 1000 by Goal Zero, 96.8Ah (10.8V) ...
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2answers
261 views

Can I charge a super capacitor with a MPPT?

I already did some testing. I have a 220mW solar panel that charges a 3V supercap (takes a long time) which eventually powers my wifi module that needs ~1.5W (1.5 J/s) for 1 second then ~90mW (0.09 J/...
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0answers
65 views

Max Charging Current for AGM batteries in parallel

I have 3 identical 125ah AGM deep-cycle batteries, all purchased at the same time. They will be charged with solar, through a charge controller. I have them connected together in parallel. They are ...
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1answer
382 views

Using Buck Converter as Solar Charge Controller ? (see pic)

Can I charge Li-Ion safely by connecting PV Panels to a CC CV Buck Converter then through BMS to a 3S3P batteries? This is basically a plan for a very small solar powered device that takes in solar ...
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2answers
85 views

Best way to create a daylight charging station and for a laptop of 135W consumption with solar energy and lower battery capacity posible

I want to create a charging station and for a laptop of 135W consumption with solar energy, because in my area electricity outages are normal (5 hours per day or more), but I need some help? I want ...
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0answers
190 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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0answers
17 views

Solar Low Current Disconnect Options

I've built a system which allows me to remotely control a well pump which is directly connected to 24v solar array. There is a regulated battery bank/inverter, but it's farther away, and the pump is ...
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1answer
216 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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1answer
97 views

Maximum Power Point Tracker (MPPT) charge controller - what drives the weight?

I'm having trouble finding any literature paper that studies this problem. What drives the weight of an MPPT charge controller? How would I go about reducing that weight if I had to design a custom ...
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1answer
31 views

Wiring solar panels and battery bank [closed]

I have 4 12v batteries, and 2 mppt charge controllers. I want to run the batteries in a series to get 48v. The two charge controllers are 12/24v output. Is it possible to charge 2 batteries with each ...
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0answers
60 views

Gate drive circuit for 1500VDC two switch flyback converter

I am designing two switch flyback converter for 1500VDC input solar application. I am little bit confused while selecting gate driver circuit, specially for high side gate drive. I didn't find any ...
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1answer
66 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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2answers
56 views

using 12v battery charging by 20w solar pannel, can i use 12 v directly plug in to my 12v 1A router without its adepter? [duplicate]

In my home i have installed solar pannel in 9 years ago. (20W pannel, 12V Solar Battry 35 A, 20Hr). Where my battry is almost dead but still it is working.we can use its 8w load to max 3hrs. But in ...
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1answer
304 views

It is possible to use a 100W 12V solar panel directly to charge a laptop, using a buck converter for example?

I am planning to go off the grid due to the pandemia, to an isolated village. I am working remotely I am looking for a solar approach to power my laptop ACER A5 515. The charger is rated 40W. I was ...
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1answer
114 views

Solar panel to battery, dc to dc converter question

I need to design an MPPT and the converter that uses it. the thing is: the Solar panel has a max voltage of 40V and the battery that is going to be charged is around 100V, the most easy thing would be ...
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1answer
168 views

How to Wire DC Motor to Solar Panel and Battery to Only turn on at Night?

I have tried looking this up on google but can only come across ones that have the motor running all the time from the solar panel and battery, where I need it to run only at night. So anyways, my dad ...
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0answers
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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0answers
40 views

Adding a bike generator to a solar panel system

I have a 12V solar panel setup currently and would like to add a bike generator to it. I've created the bike generator and have it also producing 12V direct current. I've seen some other post where a ...
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1answer
289 views

How to Ground DC 12V Battery, Charge Controller and Solar Panel?

In my shed, i've got a 12V 120AH leisure battery and 30A MPPT solar charge controller, on the shed roof there are three 100w 12V solar panels. I wonder if I need to ground any of those? If yes what ...
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1answer
46 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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2answers
225 views

parallel connecting 24v 1500mah NIMH battery packs and how to charge

After several of searches on the internet for information about charging NIMH batteriers, i feel the need for some clarification. I've gotten my hands on a bunch of battery packs. Each battery pack is ...
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1answer
110 views

Can I run 12V camper van fridge whilst 'trickle charging' the battery in van?

I am running the following setup in my camper van and would like to know if there is a simple solution or device that would be effective in allowing me to run my 12V fridge whilst the leisure battery ...
1
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1answer
50 views

Full charged 12V battery with AC converter “empty” within one second - voltage drops, converter beeps

I have the following setup for solar power, which worked well until recently: solar panel <--> solar charge controller <--> small (car) battery <--> converter: 12V DC to 220V AC <--> my ...
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1answer
76 views

'Invert' a logic low and logic high signal from a FM60 controller [closed]

We have an Outback FM60 controller which outputs 0 or 12V as a command, 0 for logic high, and 12 for logic low. I need to invert that for our solid state relay to output 12 for high and 0 for low. ...
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2answers
574 views

How to fix dc 12 led lights that burn out due to excess voltage or current

How to limit the output DC voltage to dc 12V if the input voltage is greater than DC 12v, and it outputs same voltage if voltage is below 12 V like 11.5 V or 10.5 V? Scenario: I have solar setup at ...
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1answer
166 views

MPPT Reads Negative Amps

I have MPPSolar PCM5048 MPPT which is connected between the solar panels and the batteries. It was working well until yesterday as a sudden it reads negative amps on the battery current. it keeps ...
0
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1answer
22 views

Recharging of Inverter Batteries

Is it possible for some reason I can be able to safely connect two charge controllers (who draw their solar power from the same solar panel array) to charge separate/independent batteries? (It is to ...
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0answers
32 views

Is it safe to have two batteries in series on a solar panel system with 14.22v and 14.46v?

I have two batteries in series plugged to a solar panel system. In parallel they used to balance each other perfectly. But now i'm trying to have a 24v system and I have them in series. They ...
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1answer
36 views

How is power generation computed in a circuit?

I have made a simple circuit of by attaching a 10 ohm resistor in series with an LED and then attaching it to the solar panel. I use an AVR Microcontroller to measure voltage across the resistor ...
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1answer
147 views

What is the maximum voltage for MPPT/PWM to charge a X volt battery?

I currently have a PWM 12/24v (auto commute) with ~18V as input and a 12V battery in the output. I wanted to switch to 24V battery and I thought about going ~36v solar panel. (18V * 2) Then I saw ...
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1answer
125 views

How can I switch solar panels on and off with a microcontroller?

I have built a li-ion 18650 7S pack as my solar backup. It is being charged by 3*250W solar panels in series (about 105V 8A.) My charger doesn't have an option to monitor individual cell voltages. ...
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2answers
82 views

Charging a big battery with small solar panels very very slowly

I have a 6V, .7amp solar panel that typically puts out 2-5V under normal conditions. I would like to charge a 12V 5 amp hr lead acid battery over a few days to weeks. The device that I want to ...
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1answer
197 views
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1answer
52 views

External diodes for Solar panels in parallel

I have two solar panels, same brand same model and same voltage and current characteristics. I wish to connect them in parallel. Must I use an external diode? I have checked, they have two diodes ...
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4answers
1k views

Solar charge controller with input from a laptop charger efficiency

Instead of connecting a solar panel to my 12v 30a PWM solar charge controller, I want to connect a laptop charger to make a DIY UPS. Will the solar charge controller constantly draw the maximum ...
0
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1answer
51 views

what is the equivalent circuit for battery in charging process?

OK I know a little bit about battery discharging process that is, I know that the open circuit voltage of battery decreases as SOC goes down, and the voltage is less than the Voc when connected to a ...
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1answer
54 views

Power limiter for 1 kW hydro turbine

I have a question about designing a solar-hydro energy system, as we ran into a problem in the implementation phase. We have 1 kW pv plant connected directly to a charge controller, and the 1 kW hydro ...
1
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2answers
218 views

RS-485 to USB converters (cable conversion)

I am working on a project that involves a Solar Charge Controller. The device ships with an Ethernet RS-485 communication interface as well as a RS-485 to USB cable, which is said to be able to ...