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Questions tagged [solar-charge-controller]

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76 questions with no upvoted or accepted answers
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54 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
120 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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50 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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1answer
2k 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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91 views

Current and voltage increasing with duty cycle from buck- converter

I am designing a 2s Li-ion battery charger using a buck converter from a 10W (18V, 0.55A) solar panel. So I understand that the duty cycle controls the ratio of the input power vs output power and ...
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1answer
93 views

EV Car's battery voltage and charging with solar panel

How much is the voltage of electric car's batteries? I was thinking about a DIY electric van (Mercedes Sprinter) with 3x200 watts solar panels on the roof. I'm not sure but let's say the EV batteries ...
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1answer
50 views

How to measure available amps? Do i need more load?

My new 200W 18v 11a(max) solar panel reads about 24v 4a 50% efficiency at midday on my MTTP Rich solar controller. I presume this is not great. I was wondering... I have a 48v to 12v stepdown ...
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537 views

Battery float voltage of CN3722

I want to charge a 2-cell Li-ion battery with CN3722 charging IC. According to my circuit design, the float voltage at the battery terminal should be 8.4V. But, the float voltage is measured as 13.44V ...
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21 views

Using SLA in place of LFP to test an LFP charging device

I'm testing a solar charge controller for LiFePO4 that uses absorption and float stages. By design, power-on initiates the absorption stage, and a timer terminates absorption and initiates the float ...
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0answers
54 views

What happens inside a battery connected in parallel to a load and MPPT solar charger?

This seems like a common configuration: connecting solar panels + MPPT charger to lead-acid batteries which are also connected in parallel to an inverter. Assume that, momentarily, the battery has ...
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447 views

Solar Charge Controller with SMPS Power Supply

Hi, I want to charge a 2-Cell Li-ion battery (7.4 V) using CN3722 Solar Charge controller and a SMPS power supply (instead of using solar supply). I have designed my circuit to charge with maximum 1A ...
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99 views

Bypassing solar charge controller using trickle charge voltage?

In an effort to simplify a small solar system and to keep the cost down, I am wondering what (if any) drawbacks there are to having the Vmp (voltage at maximum power) in a solar panel setup, at 12.5% ...
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2answers
148 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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1answer
60 views

How do I re-wire my Airstream Fusebox so as to follow best practices?

I was not sure if this was better suited for Automotive Stack Exchange, but here goes. I'm tying to redo the fuse panel in my Airstream and I have some questions about the best way to wire it. The ...
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1answer
74 views

Solar panel system - figuring out the right specifications

I'm building an off-grid security system, based on a smartphone as a 24/7 security cam and an arduino nano for several sensors. A pretty interesting build in my opinion, maybe I'll post about it ...
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1answer
55 views

3-axis solar tracker design

Is it possible to design a 3-axis solar tracker using three stepper motors just like dual-axis solar tracker in which we use two stepper motors one for elevation and one for azimuth?
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59 views

Harvesting energy from solar and "USB"

I'm designing circuit based on a microcontroller, powered by a solar cell. As an experiment, I wanted to add an energy harvesting IC (bq25504). When programming, I'd like to be able to charge the ...
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84 views

charge controller question: disconnect pv with mppt from full battery

I'm creating a battery charging model with pv and a buck converter controlled via a P&O mppt algorithm. My charge controller currently disconnects the pv panel from the battery as the latter ...
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1answer
79 views

Simple Solar Setup question

I have recently purchased a 10W polycrystalline solar panel with 30A battery clips, a 20A solar charge controller (intelligent regulator with 12V/24V USB display) and a 12V 7Amp lead acid rechargeable ...
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1answer
171 views

Solar panel Voc

Open circuit voltage is high in solar panels,when feeding the same voltage to any charge controller IC which has Operating voltage range which is far less than the Open circuit voltage, will that ...
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2answers
306 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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3answers
189 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
200 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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1answer
73 views

How should a load be connected in a configuration of a MPPT solar charger and a LiPo battery?

I am designing a circuit for MPPT solar charger SPV1040 which could charge a single-cell LiPo battery. I am using AN3319 and AN4050 application notes for reference. I also want to connect a load ...
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1answer
2k views

Power bank charging using a solar panel

I'm trying to charge a power bank of 5V, 5000mAh, using a solar panel 6V, 14W. I have made the connection from the solar panel to a DC-DC convertor (specification: 3-37V, 3A) which steps down to a ...
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1answer
172 views

How can I design a boost converter for a maximum power point tracking problem in a stand alone solar PV system?

Boost converter (or any dc-dc converter) connects PV array with load. MPPT algorithm modifies the duty ratio (of this converter) such that PV array is operated at voltage (or current) corresponding to ...

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