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Questions tagged [solar-charge-controller]

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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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1answer
15 views

Solar Panels: Charge Batteries via MPPT Charge Controller *AND* Power PV-Direct Load At Same Time?

I have two 290 watt panels in series that are currently used to charge a 48V battery bank via a MPPT charge controller. The run from the panels to the charge controller and batteries is about 70', and ...
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17 views

MAX17205 battery pack fuel gauge configuration

I am working on the fuel gauge by MAX17205 for my project. https://www.maximintegrated.com/en/products/power/battery-management/MAX17205.html I am able to communicate with the chip using I2C protocol ...
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16 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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44 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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1answer
14 views

Combining solar panel strings with different azimuth

When combining strings with a different azimuth in an off grid system, lets say NNE facing with North Facing and NNW facing (Southern Hemisphere), you catch the morning and evening sun better, this is ...
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1answer
23 views

Designing an effective extensible solar cell + car battery setup [closed]

I've got a cabin that I visit on weekends and because I need to charge my computer and tools there, I decided to bring an old car battery and bought a solar panel to charge it. Right now I use a cheap ...
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0answers
18 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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21 views

How to calculate step-down current

I am getting ready to set up a solar system. I am having trouble choosing the right MPPT charger. I know how to calculate the input current but is that all you need ...
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1answer
54 views

Gel battery overcharge

I have 2 identical 12 V 100 Ah lead-acid batteries in parallel. I used to keep them fully charged with a mains charger, one with a built-in algorithm for these kind of batteries. I recently hooked up ...
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0answers
87 views

Solar Li-Po battery charger with MPPT algorithm

I'm new here but I have read a lot of topics here about my question. I am designing a solar battery charger with MPPT algorithm but I don't know if I am doing it well. First of all my specs are here: ...
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2answers
38 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
35 views

Battery sizing for motor?

I have a question regarding battery sizing and solar panel sizing ,I am not from an engineering background that's why i might need some help with this. I want to run a 24vdc gear motor 180W 11.5 amps ...
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1answer
35 views

Should a off-grid wind charge controller be UL certified? [closed]

I recently bought a 2kW wind generator, 48V Charge controller and a UL certified off grid wind inverter for my Home based wind project prototype. My charge controller which I am using to rectify the ...
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1answer
46 views

What is the best battery configuration for a solar powered electric fence setup?

I have two solar panels: SunWize SW-85P; 85W max power, 5.1A, 16.7V. I have a charge controller: SOLAR BOOST 2000E. I have four 12V batteries: two Interstate SRM-24 (couple years old), two CarQuest ...
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4answers
299 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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2answers
408 views

MPPT without a battery

I have a device that pulls about 10 amps and is typically powered with a car battery. It runs fine with less amperage but needs 9 to 14 volts. I want to power my device directly from a solar panel but ...
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1answer
213 views

Connecting 18650 batteries in parallel? [closed]

I have encountered a bizarre situation, i bought two 18650 batteries each of 3.7V, 2200mAh, im using a Tp4056 based charger with battery protection which has DW01A and FS8205 to protect the battery ...
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0answers
24 views

wiring two inverters/charger at the same battery bank

I have 30 solar panels charging 12 batteries (48V system, 4 12V batteries in series ×3 ). 230 W / V=36.4V \$I_{\text{SC}}=8.56\,\text{A}\$ My problem is that I have not found a solar charger for the ...
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1answer
31 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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0answers
41 views

Questions about using a step up/down voltage regulator in a solar charging application

In my portable 12V solar charging system, my MPPT charge controller and LiFePO4 battery pack don't play together well at end of charge. The battery disconnects at some low charge rate, and when this ...
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183 views

Help designing a satellite MPPT board [SPV1040] [duplicate]

I'm in the process of developing a pocketqube and I am currently working on the power system. I am hoping to use an SPV1040 MPPT IC to simplify the design and maximize efficiency. Each side of the ...
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1answer
135 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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2answers
307 views

0.9v boost with Tp4056 for 6v Solar Panal?

Can I use it like this... If so how can I limit my solar panel to only output 5v cause my booster can only handle up to 5v input.
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1answer
43 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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2answers
103 views

Is it safe to connect a small solar panel to a lead acid with only a diode?

Is my setup safe? I'm connecting two 7.2v 100ma solar panels in parallel using two 1N5817 then to a to 6v lead acid battery with a Constant Voltage Charge of 7.3-7.4v for cycle use.I can't use a MPPT ...
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2answers
41 views

Drawing DC current from batteries on charge controller

I have an off-grid solar system where this inverter/charge controller (ICC) is connected to a 48V battery (which is in fact 2 parallel quartets of 12V batteries, but this is non-relevant detail I ...
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2answers
231 views

Charging a 4000mAh Li ion battery using multiple TP4056 ICs

As single TP4056 IC rated current is 1A,so I was thinking to connect multiple TP4056 ICs in parallel, such that enough current can be sourced to charge the li-ion battery(400mAh) connected. Here is ...
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1answer
92 views

Limit MPPT solar charger output voltage

I have a problem with my mppt solar voltage regulator. I have a campervan with three 320 W solar panels (Voc 40.8 V, Vmpp 33.3 V) connected in series on the roof, and two 260 Ah, 12 V AGM batteries ...
4
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1answer
321 views

TP4056 heating very badly

I’m charging a Li-ion 3.7 V, 3500 mAh using a TP4056 charge controller IC and feeding a 6 V, 9 W monocrystalline solar panel to charge it. When I connect the solar panel at good sun light at 2 PM in ...
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1answer
44 views

Charging a single 12V battery from 2 solar panels

I'm building a solar powered robot that uses a 12V lithium battery. It will have two (17.6V max) solar panels - one on the top and one on the bottom (so it will still work if it flips), meaning I won'...
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2answers
70 views

How to store/use energy that could be generated from a solar cell duing the off stage of a buck converter?

I am trying to design and build a MPPT charger to charge a battery from a solar cell. From what I understand, an MPPT controller is basically a buck converter where the output voltage is optimized ...
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1answer
187 views

14watt 6v solar panel feeding to a TP4056 based charger for charging a Li-ion battery

How to design a solar power based power supply for charging a Li-ion Battery of 3.7v 3500mAh, using TP4056 ? Specs about Tp4056 based charger using are it is programed for 1.2A current max, and 4.2v ...
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1answer
33 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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1answer
91 views

buck converter doesn't work [duplicate]

I am doing my project. and it's about a DC-DC converter. I am using HCPL 3021 as a driver for the MOSFET IPPR045C7. in open loop cicuit, I am using Vin=60V, with duty cycly = 60% of PWM signal (F=...
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1answer
66 views

Solar and Batteries [closed]

I want to ask a few questions that relate to solar panels and the charging of batteries. I have looked all over the internet for answers but have not found anything that answers my concerns. The most ...
0
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1answer
130 views

Design a Li-Po battery charger with small solar panel and charger controller with embedded MPPT

I'm designing a small solar charger with these characteristics: SOLAR PANEL Voc = 5,65 V Vmp = 4,25 V (Voc -25% approx.) Isc = 250 mA IC CHARGER CONTROLLER STMicroelectronics SPV1040 High ...
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0answers
42 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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0answers
31 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 ...
0
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1answer
42 views

Solar panel selection

I have a project being setup in my garden for an aeroponics system its basic components are: 1. Esp8266 2. Single channel relay board 3. Temperature & humidity sensor 4. 12v 3a - 100psi pump 5. 2 ...
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1answer
66 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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0answers
350 views

Solar charging a lipo battery with ESP8266 as a battery load

I am trying to add solar harvesting capability to my IoT device based on esp8266. I am using linear charge controller (MCP 73831) with solar input to charge a 500maH lipo battery. An observation when ...
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1answer
83 views

What are the limits to connecting batteries in parallel?

i've been researching components for a solar project and have been struggling to find an answer to this general question: how do you determine how many batteries, or series of batteries (lead acid in ...
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3answers
931 views

How does a maximum power point charge controller regulate the charging current, when it always draws the maximum current from the panel?

I want to understand exactly how an MPPT charge controller works and all I could find is this: An MPPT charger is a DC-DC transformer, that when it lowers the input voltage, it raises the output ...
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1answer
113 views

solution to replace tlc2272cp ic

I am trying to bulid the following circuit that work as solar power charging controller. Unfortunately, I couldn't find IC1 named as TLC2272CP that works as dual low-noise rail-to- rail Operational ...
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1answer
1k views

Cheap PWM Charge controller not charging the battery

I recently got myself a CMG-2430 PWM charge controller(pretty cheap I know) and a 12v deep cycle battery. The problem is that the charge controller doesn't charge the battery when I connect the solar ...
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1answer
241 views

Need help in making an automatic battery cut-off switch

I want help in making a automatic cut-off circuit to stop charging of the battery when the potential across the battery reaches 13.3 Volts. The problem is that I want to cut-off the Solar panel from ...
0
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1answer
723 views

Precautions when connecting both an inverter and solar panel to AGM deep cycle battery simultaneously

I am a complete novice with batteries, inverters and solar panels / regulators. I have purchased a 130Ah AGM deep cycle battery, a 500W pure sinewave inverter and 2 x 100W solar panels with built-in ...
2
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1answer
882 views

Charging Li-Poly Battery with Small solar panel

I have Li-poly battery that is 4.2V 2000mAh with a protection circuit. I have solar panel that is 5V 250mA. The aim is to charge the battery to maintain a fully charged battery, so it really ...
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1answer
57 views

Connecting solar panel to a USB controller

I am a complete beginner in this area so please excuse me if my question is stupid (I am just starting and have a lot to learn). English isn't my first language so pardon me if I make any mistakes (or ...