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Questions tagged [solar-charge-controller]

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1answer
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Is MPPT of PV array possible if only converters are used and the connected load is a battery?

I am currently working on a project to harvest energy from solar PV panels. There are some difficulties that i am facing. I was able to achieve mppt using a constant resistive load with a converter. ...
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2answers
46 views

Possibilities for 24v Solar charging of 12v batteries in series and parallel with different Ah capacities

I have two 12 volt 200Ah lead acid batteries and two 12 volt 150 Ah lead-acid batteries. I have a 24 volt 50 Amp charge controller connected to a 150 watt PV panel (overkill for now, but ready for ...
3
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1answer
94 views

Minimum current for charging a battery

Recently I bought a 12V 200Ah battery for my solar system with 500W 18v (27A) solar panels. I find a label on the battery which is notice that the minimum charging current is 10% of the battery ...
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1answer
42 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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2answers
52 views

Van with Solar power but no auxillary battery and only on sunny days. Do I need switches and isolators?

I have a 2018 Ram Promaster city cargo van with OEM 12v 70AH 120RC Sealed Led acid battery and a 160a alternator. Sitting on top of the battery I have a 1200 Watt pure sine 110v inverter connected ...
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1answer
50 views

Heating issues with solar charging circuit

I am using the above circuit to charge a 7.4V Li-ion Battery.With input MPPT voltage set at 12V, I have applied 13V input voltage to the circuit. The battery is charging at 1.4A. (according to the ...
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22 views

Solar Panel Peak Power Tracking

I have a solar loader circuit where I only know that it handles "17 V Peak Power Tracking". Is this comparable with Maximum Power Point Tracking? Which voltage should the solar panel deliver?
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54 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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40 views

Solar Charging Transfer Switch

I am trying to figure out a way to have a power bank in the middle of a field. It would have multiple battery packs. I would like to try to create a system where a solar panel would charge one battery ...
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0answers
16 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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1answer
24 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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28 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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21 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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0answers
108 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
17 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 ...
0
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1answer
24 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
24 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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0answers
23 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 ...
0
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1answer
107 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
143 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
52 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
36 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 ...
0
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1answer
36 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 ...
0
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1answer
49 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
588 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
695 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
274 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 ...
0
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1answer
32 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
56 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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0answers
230 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
286 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
447 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.
0
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1answer
48 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 ...
1
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2answers
116 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
42 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 ...
0
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2answers
264 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 ...
0
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1answer
152 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
435 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 ...
0
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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
73 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 ...
0
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1answer
237 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 ...
0
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1answer
35 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?
0
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1answer
108 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
74 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
160 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
44 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
38 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
70 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 ...