Questions tagged [solar-charge-controller]

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2answers
34 views

Operating a solar panel at lower than MPP

The power curve for a solar panel drops off slowly to the left of MPP (lower voltage) and more rapidly to the right of MPP (higher voltage). Observing my MPPT CC, when it needs to "throttle"...
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1answer
78 views

Switching solar power off through mosfet

I have got the following situation: ESP32 powered through a LIPO Battery 5V (1W) solar panel LIPO Battery charger (through the solar panel) voltage divider to sense current flowing through the solar ...
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2answers
44 views

Is it a good idea to charge multiple Li-Ion batteries using a single buck converter?

I am trying to implement a DIY MPPT into my solar tracker project and I wanted to know if it was possible to charge all of the three li-ion 3.7v batteries in series with just one feedback buck ...
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5answers
5k views

Why are off grid solar setups only 12, 24, 48 VDC?

I am looking to produce 50kW for an off grid solar project. Ideally, I'd like to have a high voltage DC battery system with a high power battery inverter and charge controller. I have only found a ...
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1answer
29 views

Generator Charger Grounding

A while back I sketched up a small charge control circuit that can be used with either a wind or solar generator scenario. This is only meant for smaller 12V 10-30W /hobbyist/home made generators and ...
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1answer
368 views

Solar charge set up damaging battery?

I've installed a 12V 80W solar panel plus controller and attached it to a 12V 105Ah leisure battery. At first it (appeared to?) work. The charge status on the solar charge controller was at max and it ...
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1answer
217 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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2answers
70 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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1answer
52 views

How to attach a relay or any circuit to make a solar inverter work as UPS

I just purchased a new 2.5kW solar inverter. It has following out put functions When solar power is available it will give AC power from it if solar power is low it will get power from battery and ...
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0answers
66 views

Charger CN3722 does not terminate charging

Update: R7 is fix inserted by the manufacturer and is always 14k. R6 has to be changed according to the manufacturer to 5.76K if a 2 cell Li-Ion is charged at 8.4V. The manufacturer even supplies the ...
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2answers
51 views

Trying to measure solution's color intensity. Is there any way to stop voltage variations?

I am trying to build a spectrometer to measure the color intensity of a solution. By chemistry I can make up a solution that has exactly 1 mg of gold in it and another that has 5 mg of gold in it. If ...
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1answer
41 views

Buck- Boost converter failed on surge at 500volts

Basic Technical Details The driver is basically a DC solar charge controller, it's used in solar street lights, it requires a battery and panel. This driver uses the Buck-Boost Topology. At night it ...
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1answer
167 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 ...
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1answer
79 views

Solar cell DIY with monocrystalline silicon wafer

I would like to make my own solar cell- From a quick search on youtube, these 2 videos are apparently always the #1 result for "solar cell diy" keyword or similar: Video 1 Video 2 The ...
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1answer
40 views

super capacitor's maximum charge current

I am designing a backup system based on a supercap and an LTC4041. The calculations by the guidlines in the datasheet brought me to the folowing parameters: Capacity:2.4F Charge current: 1A charge ...
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1answer
160 views

Charging 4 x 12V lead acid battery with solar in series or parallel?

I have a small electric vehicle that currently uses 4 x 12V 8Ah SLA batteries wired in series as its 48V battery packs. I have 2 of these packs. In order to charge the batteries, I unplug all of them,...
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119 views

Will this schematic work for my custom LifePo4 BMS and power MOSFET control?

I have designed the following schematic which I plan on using as a raspberry pi hat to monitor the individual lifepo4 battery cells wired in series (16s - 48v) and to toggle on or off 2 different ...
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1answer
306 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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2answers
264 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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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
1k views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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0answers
27 views

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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0answers
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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2answers
69 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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1answer
233 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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2answers
146 views

Measuring battery voltage in PV scenario with MPPT charge controller with inverter

So I'm doing a PV project with wifi enabled statistics. I'd like to see the watts coming in and out and the battery charge level, estimated battery charge and discharge time. I'm designing PCB to ...
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0answers
68 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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4answers
5k views

How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
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1answer
64 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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2answers
3k views

Is the power from solar panel redirected to load when battery is full?

When the solar panel attached to a charge controller then to a battery, simply stops the charging when the battery is full or Is the charge controller(MPPT) smart enough to redirect the power directly ...
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0answers
41 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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1answer
36 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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0answers
20 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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0answers
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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2answers
56 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
87 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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1answer
98 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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1answer
75 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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2answers
48 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
45 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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1answer
2k views

Difficulty in understanding charge controller for solar and wind energy

I am having difficulty in understanding one control box which is used to charge the battery using solar and wind energy as well as power the load at the same time. I have attached the picture below ...
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2answers
49 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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0answers
45 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 ...
1
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1answer
384 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 ...
0
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1answer
36 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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0answers
67 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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0answers
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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0answers
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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0answers
62 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 ...
2
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1answer
49 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 ...