Questions tagged [solar-charge-controller]

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Solar controller efficiency

To my understanding, most solar controllers use some form of PWM to output a desired current/voltage combination. These seem to often do some sort of DC-DC conversion. This seems to be wasteful and ...
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26 views

Solar not producing 24V all the time [duplicate]

We live in a moderately sunny place. We do get some cloudy days frequently. I have seen the output to go above 24V(like25V) on a fully sunny day middle of the day which means lots of days the solar ...
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60 views

Solar panel does not charge after lipo battery is low

I am trying to run arduino with solar panel, I have a project for farming so electrcity is problem. I need to use a independent energy. I bought Solar Power Manager 5V SKU DFR0559 and a 2000 mAh LiPo ...
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66 views

Is grounding 12v 100W solar panel to a lightning rod necessary?

My plan is to put a solar panel on my greenhouse to run a 150 W 12 V heater for 20 minutes max and turned on depending the low temperature is detected by a sensor, automation controller and a grow ...
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1answer
58 views

Solar load sharing for an MCU

I understand P Channel MOSFET operation and was reading this question which shows this circuit: but I wasn't sure whether this can be used to load share with an MCU such as Arduino or ESP32 which ...
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22 views

Can I connect two charge controllers, one controller to lithium ion battery and the other controller to AGM battery. One 400 watt PV

Can I connect two 12 volt charge controllers to my 400 watt solar array? I presently have a 12 volt 40 amp MPPT controller connected to a 12 volt 200 Ah lithium ion battery. I would like to connect a ...
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33 views

reduce voltage for inverter in solar system

I have a solar system (solar panel, controller, battery and inverter). Battery have standby use 13.6-13.8V, cycle use 14.5-15V. I set the charging voltage to 13.8V. The problem is that inverter to 230 ...
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19 views

LTC3106 solar harvester over-voltage at output during recharge

I'm using an LTC3106 in the configuration of the attached schematic: It works fine from battery and from Vin inputs, delivering the expected 3,3 V at Vout. Problems arise when, with Vin present, the ...
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20 views

Regulate low quality battery charger output through solar charge controller

I have a remote P2P internet relay station that has had just had it's solar panel stolen. In order for me to go service it requires 400L of fuel in a speed boat; so I would like to put off going there ...
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53 views

14500 vs 18650 charge circuit

General question: Is the charge circuit/protection circuit the same for a 14500 and 18650 cell? (I assume so because of the same nominal voltage, but wanted to make sure) My specific case: https://www....
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2answers
70 views

How do I match a battery pack voltage to my solar panels?

We're building an autonomous boat which should be powered by solar panels. We want to put two 100W solar panels on it. Most panels I see are 18V and for redundancy we want to link them in parallel. ...
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74 views

Solar panel charging issue [closed]

I have a 160W solar panel that has a built in regulator that I have hooked up to a 100Ah 4 cell Lithium Ferro Phosphate battery. When I connect them the panel starts charging anywhere between 5 - 7 ...
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1answer
96 views

Paralleling of battery chargers [duplicate]

Can we parallel the bbattery chargers suppose buck controllers.Two buck controllers taking power supply from the same power bus. The output of each controller will charge the batteries connected at ...
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47 views

Should I connect 4 solar panels (3.6v 900/1A) in parallel, in series or independently to the PCB to gain better power outcome?

Good morning, I have 4 solar panels with 3.6v 900/1A each, ~3.4W. I would like to connect them using a PCB to be able to charge an internal lipo battery, a smartphone or other devices. My question is: ...
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1answer
44 views

What size of fuse do you put between 330w 9.08 solar and 12/24 auto charge controler [closed]

Please help me with my question. I have a 330w solar panel and how do i know the correct fuse size to put between the solar and the charge controller. Also fuse size between the charge controller and ...
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2answers
47 views

What is the main reason why solar inverters fail?

As I understand electrolytic capacitors fail eventually after some years of use. Is there something else that breaks down too? Because changing inverter just because its capacitors are gone is really ...
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1answer
28 views

Connecting CN3722 to Load AND Battery

Like the title says, can I do this? I got two schematics in mind about how to wire these up, which one is the correct one? This one is straightforward, but will it actually work if connected to load? ...
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46 views

How to disable battery charging in an inverter?

I installed solar retrofit to an already existing inverter battery setup. Now during daytime,inverter will be in battery discharge mode by converting DC from battery to AC for appliances use.While ...
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39 views

Transformer with diode to provide a battery backup

I have a small solar setup running with a low capacity battery plus a 100w solar pannel and i have 3 raspberry pi's getting juice from it. The thing is that sometimes with a cloudy day i can have my ...
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55 views

Is there a possibility of repairing this garden solar led lamp?

I bought several solar lamps that look like this: They have a flame effect. Like all other such solar garden lamps the solar panel is too weak. When there is little sun in two days they are empty. ...
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61 views

Using 3.7V li ion batteries in series

I'm working on a solar powered project which requires two voltage levels - 3.2v-4v @ 2A for one element an 6v-12v @ 500mA for another. My initial plan was to use a 12v lead acid battery with a solar ...
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1answer
45 views

Constant or variable current when using a solar charger?

I am looking at the CN3083 chip to charge a LiPo battery using a small solar panel (5V 0.15W). To set the charging current, the pin ISET is used with a fixed resistor, to set the constant charge ...
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24 views

Trying to figure out an RC Plane Solar Charger

So for a project I am looking at making a solar charge controller for a 3S Li-Ion battery system used in an RC Plane. The issue I am running into now is that I am unsure how to go about designing the ...
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1answer
51 views

PWM and MPPT charge controller on same solar panels

I have two identical solar panels in series that are connected to an MPPT controller (EPEver Tracer 1210A), which is currently charging two SLA batteries connected in parallel meant to power some ...
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16 views

Specific solar circuit setup recommendation?

For a setup which uses: a 100Ah 12V battery (Absorbed gel mat Lead acid), with an MPPT solar charge controller, a 12V 12-55A DC electric motor as the primary load, additionally some 12V LED lights and ...
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20 views

Automatic power selection circuit with solar panel

I am working on a design which includes a power regulator , Lipo Battery and battery charger circuit. If V_USB power the battery gets charged and the MCU gets power, if no power is feed to the usb ...
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1answer
80 views

Can you prove that electricity was generated by a photovoltaic cell?

I am wondering if it would be possible to build a photovoltaic cell that kept track of the electricity it generated (perhaps with a built-in meter), such that you could not trick the meter without ...
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33 views

5MM Blinking (Candle) LED replacing a White 5mm LED in a Solar Garden Light

I'm looking to replace the standard white LEDs I have in my solar powered garden lights with the same size yellow blinking (candle) LEDs. My garden lights use the ANA618. I know the blinking LEDS ...
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2answers
177 views

Can a 12 volt voltage regulator be used to charge a 12 volt battery system using solar panels

I have a 3 X 18650 battery set with bms. I would like this to be charged using a 12 volt solar panel which outputs anywhere from 15 to 20 volts. the BMS has a max voltage rating of 12.8 volts. I was ...
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44 views

Solar cell input for LTspice

I am trying to send a solar input into the LT8390 in LTspice. I am having trouble finding example circuits in LTspice that I can implement. Any direction or LTspice model files would be very helpful.
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1answer
203 views

Connecting BMS to charge controller and load

Im trying to design a circuit that the load will get power from solar panel or a battery (in case the solar panel will not deliver enough current\voltage) Also wanted to mention that this is a hobby, ...
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1answer
136 views

Will 14.4 volts from my solar charge controller damage my 12v equipment?

My charge controller is set to recharge my battery bank and begin a float charge at 14.4 volts. If I use some of my 12 volt components during the day while the batteries are charging, will this high ...
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1answer
133 views

How to Increase Solar Charge Controller Output Amps

I am new to solar panel system set ups, and I'm trying to make an off-grid DC-DC solar panel system where in I will be running a bunch of 12v loads which are mainly DC Pumps cause its gonna be ...
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44 views

Is it ok to connect the output of a solar controller to a fused outlet on a fuse panel?

The fuse panel is breakered to a battery and is used to power other low amp equipment. The model is the 6 gang blue sea panel with blade type fuses. Since the fuse panel is just a couple pieces of ...
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340 views

I have a solar panel with below specifications. I have some questions

As in picture Vmp = 17.40V and Imp = 0.58A implies Power = 17.40*0.58 ≈ 10W. Does it provide 0.833A (10/12) at 12 volts? What does "Max. System Voltage 800VDC" mean in the picture ?
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101 views

Can I connect an inverter and a solar charge controller together in parallel with battery terminals?

I have an inverter works on AC mains and has battery charger inbuilt. I have solar panels with a charge controller. Can I connect both power sources wires to battery terminals in parallel. So In case ...
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190 views

CN3722 solar charging IC not working properly

I'm currently working on a custom PCB where I have a microcontroller hooked up to 3 LiIon batteries which are meant to get charged by a CN3722 IC. However, when I connect a solar panel to the circuit ...
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1answer
190 views

Can anyone please identify this 6 pin SMD integrated circuit

Can anyone please identify this 6 pin SMD integrated circuit or what it does? I could not find it by the code written on it. It is from a solar charger controller and I need to replace it.
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123 views

Can a large charge controller damage or explode a battery?

I have a 12V 200Ah/20Hour battery and a 60A MPPT Charge Controller. Currently, I only have 200W of solar power to charge my system (planning to upgrade to larger system soon when my proof of concept ...
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1answer
71 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
77 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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72 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
42 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 ...
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1answer
97 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
91 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
92 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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22 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
459 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 ...