Questions tagged [solar-charge-controller]

353 questions
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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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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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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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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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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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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 throttles the amount of power coming from the…
glennr
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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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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…
Ultegra12vDi2
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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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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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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 circuit,…
Grant Petty
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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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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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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 panel. ....I know that is a cheap solar charge…
Alexandru Goman
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Using LM1084 LDO without capacitors. Can that cause stability and heat dissipation design flaws in my 22V voltage limiter for a solar panel?

I want to use an LM1084 and two resistors to limit the voltage to 21.9V I have removed the reference design capacitors, assuming that stability should not be an issue here. Could that lead to nasty oscillations, or any other negative effects? I am…
call me carrot
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