Questions tagged [solar-charge-controller]

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Explaining Solar Panel Circuits to a Beginner (me)

I'm very new to solar power, and whilst I have been doing my own research on it, there seem to be a lot of conflicting opinions, so I thought I'd ask here as a certain level on knowledge is expected ...
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43 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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44 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
25 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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14 views

can Powerwall 2 be installed as DC coupled system to store extra power generate from solar panel? [closed]

My house has an existing solar panel system that connect to grid through inverter. But, at peak time, my solar panel generate more energy than the inverter can convert. So, I wonder if I can install a ...
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28 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
25 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
45 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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68 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
44 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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54 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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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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30 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
22 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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39 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
29 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
34 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 ...
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42 views

Can I use a 18v solar output to charge a 4s lithium ion battery pack

So I have a couple of LG 18650 of 2200 mAh batteries each and a solar pannel that provides 18v output under load and 21 v under open condition. I'd like to build a 4s battery pack with a balanced bms ...
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1answer
48 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
39 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
113 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
50 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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19 views

Help in using a const Voltage, const Current MPPT

I've bought this MPPT with a 12V solat panel & battery, to use in various outputs/ loads ( mainly ESP8266 projects ). Unfortunately very little documentation for this item. Found a more ...
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1answer
19 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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28 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
51 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
67 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
65 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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40 views
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70 views

Fitting a BQ24650 based MPPT charge controller to a permanent magnet generator wind turbine

I am investigating MPPT charge controllers modules for wind turbines. I came to the conclusion that my MPPT controller design investigations are more fitted to wind turbine MPPT than solar. I need ...
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1answer
47 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
444 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 ...
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1answer
40 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
52 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 ...
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2answers
132 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 ...
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1answer
33 views

Simple Solar Circuit

I had a very cheap solar panel + controller where the controller died. To cheaply replace it I was going to build my own using some parts I had laying around and use a step-down (LM2596) to limit ...
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1answer
48 views

Solar LiPo battery charger: revision and improvement of the reverse voltage protection circuit for the battery

I am designing a solar charger with MPPT for a 1-cell lithium polymer battery of approximately 6000 mAh. The solar panel is 10W and 21 Voc. I am trying to ensure that the charger has protection ...
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3answers
122 views

Solar power backed circuit to light 1W LED

What I have achieved so far: Referring https://www.instructables.com/id/BUILD-A-NOCTURNAL-SOLAR-LIGHT-BULB/ , I have successfully built the solar garden light circuit to light a 5mm LED using ...
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1answer
82 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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1answer
70 views

Can I use an h-bridge as a changeover circuit?

I have solar controller which outputs battery voltage when available. I also have a switching psu as backup. What I would like to do: Use an h-bridge, connecting its battery negative terminal to my ...
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1answer
62 views

PV with Arduino and 12Volt Sealed Lead Acid battery

I have bought this solar charger (Epsolar-LS0512E): https://www.manualslib.com/manual/970886/Epsolar-Ls0512.html#manual a 12 Volt Sealed Lead Acid battery, and I use this solar panel: Voltage: 12V ...
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39 views

Draw power evenly from two 12v battery banks, 24v solar system

I am currently running a small 24v emergency power solar system. I have a 40a MPPT charge controller with (4) 12v flooded lead-acid batteries in a 2S-2P configuration. I have a need for both 24v and ...
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2answers
247 views

How does a solar PV inverter throttle the input power

I have a solar power system (SMA Sunny Boy with 2 strings of panels). When the battery is nearing full charge or the inverter maximum output is reached and excess solar power is available the system ...
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5answers
4k 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
134 views

Connecting Grid Tie Inverter to Solar charge controller

I've got simple solar panel - PWM charge controller with 10A max load output - 12V battery setup. I've ordered MPTT 600WATT grid tie inverter. My question is - if I connect higher load than 10A to ...
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5answers
103 views

How Can I connect My Solar Power System? [closed]

I brought this 50A Solar Controller now I want to connect an inverter to it and they said to connect the inverter directly to the battery. I also brought a 100W Solar Panel and MC4 Wires, etc What ...
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1answer
943 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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1answer
73 views

12V - How to activate an electric item if battery is full

I have a solar system 12V connected to a PWM controller 20A and a lead-acid battery 80Ah deep cycle. What kind of setup should I make to activate a pump (12V) if the battery is full ( >13.8V ) ?
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491 views

Is is safe to let my PWM charge my 12V battery at 14.8V?

I have a 12V battery linked to my solar panels. In the middle I have a PWM charge controller, that is configured by default to charge the battery if Voltage if lower than 14.8. At night, battery ...