Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [solar-charge-controller]

290 questions
24
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5 answers

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 couple high VDC (384V) inverters and charge…
Lost Puppy
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6 answers

How do/can I charge a Li-po battery without a fancy charger (just using a current)?

I am designing a model airplane that flies using solar cells on its wings. I have a 7.4 V, 2200 mAh battery I want to use for it in case it flies in a cloudy area and needs more power, but everywhere I look you need to use an expensive, bulky…
Elliot Chapman
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4 answers

Understanding the working of an MPPT solar charger

I am trying to understand the working of an MPPT charger for a Li-po battery (3.7 V nominal) and a 6 V, 2 W solar ‎panel so that I can select the right charger for my project. After searching and reading a lot of related material on the net, my…
Zeni
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6
votes
5 answers

Achieving MPPT of a solar panel with an LM2596

I'm having some trouble with DC converters in a solar power system. I have a solar panel of 21 V (Voc) and 1.33 A (Isc). I have reaf that using a DC buck converter with input regulation (feedback loop taken from the input) would result in a fixed…
MDuarte
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5
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4 answers

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 understanding, the following situations can happen: solar…
Noman Bashir
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4
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5 answers

Trouble with powering DC motors from solar panels and large capacitor

I'm working with a bunch of mechanical engineers on an electrical engineering project and we're totally stumped. The main problem is to drive a small robot chassis using the power generated from solar panels. The concept we came up with is to charge…
Drew Fernandez
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4
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1 answer

Different Wattage Solar Panels for Home [different Voltage/Ampere]

My current solar system for home 12V 100W polycrystalline Solar Panel. 12V 75Ah Lead Acid solar tubular Battery. PWM 12V 10A Solar Charge Controller. 12V Input and 200VA Output Inverter. Current Problem Battery not getting charged fully daily…
Rajesh Nayak
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4
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5 answers

Best practice: Should I charge a battery while also pulling load?

I have an off-grid solar panel setup. The solar panels send current to an MPPT charge controller. The charge controller controls current to a lead acid battery. On these same battery terminals I have wires leading to my load, an inverter and then AC…
anschoewe
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4
votes
1 answer

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 the noon, though what ever the programmable…
Shiv
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4
votes
3 answers

MCP73831: design a lithium battery charging circuit

I am trying to design a charging circuit for a lithium polymer battery with 2200 mAh capacity and 3.7 V nominal voltage. The integrated circuit for the control of the charge of the battery is the MCP73831 and as a power supply a solar panel of 6.2…
FranMartin
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3
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6 answers

How is the output of an MPPT solar charge controller connected to a battery?

I have some confusion about how the output of an MPPT solar charge controller should behave. In my head, I'm thinking of a perturb and observe system where the output should oscillate around the Maximum Power Point (MPP). Let's say I'm using a 12…
Microcontroller Enjoyer
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3
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2 answers

How can I reduce solar panel voltage of 49-51V to below 48V?

My MPPT's maximum input voltage is 49.5V. The solar panel's specs are: Open circuit voltage (Voc) = 49.40V (plus or minus 3%) Maximum power voltage (Vmp) = 40.42V Maximum power current (Imp) = 10.02A Short circuit current (Isc) = 10.69A (plus or…
asan123K
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3
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2 answers

Simple low-current voltage limiter in a solar battery charging circuit

I am trying to devise the simplest/cheapest possible circuit for using a small solar cell to maintain the charge on a single-cell lithium battery. The reason for low cost is that I need to build fairly large number of devices employing this…
Grant Petty
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3
votes
1 answer

Connecting BMS to charge controller and load

I'm trying to design a circuit that lets a load will get power from a solar panel or a battery (in case the solar panel is not delivering enough power). The question is about connecting the charge controller and the BMS-2S to the load. 1. 12 V solar…
user1673206
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3
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2 answers

Matching a 9 V solar panel to a charging controller

I would like to connect a 9 V solar panel to a charging controller. The input range according to its data sheet is 7.5 V to 28 V. The output of the solar panel can vary and its value can go below 7.5 V. I noticed that most of the charging…
user1673206
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