Questions tagged [backup]
For questions about backup circuits, such as a battery backup.
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Automobile 12V UPS circuit with Li ion battery
Currently I have a battery backup circuit for a GPS device to run on automobile power source and I am trying to improve a few things. Any help is appreciated.
Currently I am facing issues of negative ...
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5v DC battery backup circuit
I am trying to design a backup battery circuit with a power input from a motor generator, and I have come up with the circuit below, For now I am unsure of the best option to deal with any excess ...
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Super capacitors derating
I want to use supercaps in a system for minimal power interruption backup (1-2 seconds). My systems works at - 40 to 85°C.
I have seen that supercaps are usually rated for 1000 - 2000 hours at max ...
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Why are 2 diodes needed instead of 1 when diode-ORing two power supplies?
I see many circuits online of dual power supplies connected in parallel through output diodes on their outputs, to provide redundancy in case the main one fails. Usually the primary supply is an AC-DC ...
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5 V to 3.3 V buck with limited input current and large capacitor to cover current spikes?
We need to design a power supply for a 3.3 V WiFi-device. But there are quite some current spikes during WiFi startup. Using the design below there is a risk the 5 V (250 mA max) supply (not mine) ...
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How can I isolate internal circuit from external power from L298N?
I have a small simple circuit where an ESP32 runs an L298N driver for a single DC motor (not a stepper.) The run and direction are controlled by a simple web page with two buttons. The code works ...
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I want to switch solar panels between a micro inverter and a backup system. How can I do that?
Solar Inverters are switched off during a blackout and make that you have DC electricity on your roof while being without AC in your home. This may not be as urgent where you live, but in countries ...
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UPS cord has back-flowing current in it. What to do? [closed]
If the UPS is switched on and it's unplugged from the wall socket, then there's some current in the plug pins as per my neon line tester. It's a three pin plug. The earth pin has no current but both ...
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Design for passive power backup for ESP32 for a few milliseconds
I am designing a logger system with an ESP32 in which the logs are uploaded to the IoT cloud and parallelly logged to a local SD card. On Power loss detection, I want the ESP32 dump all the data that ...
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VFD runs has backup generator, breaks down twice
I am Electroman, but very ignorant in electrical knowledge. I have a problem.
We have an irrigation pump connected to a VFD that runs on the electrical grid but is connected to an emergency backup ...
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Backup power supply for car stereo
I built a home stereo for my son using a car stereo and computer power supply. Unfortunately, I lose memory from the head unit every time the power is switched off. From what I understand, I need a ...
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How isolate IO pins of Arduino and PSU output?
I will start by saying that I am a beginner of electronics and I don't have much experience hence I am making this post asking for advice from more experienced peopled than me.
Now that I have lowered ...
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Connecting multiple DC Sources (DC Bus)
I have a large area which I want to cover with camera and other low power devices. These devices are outdoors, and quite far away from where my intended main power source will be (say 400m). I'm ...
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Looking for a circuit to run a 12 V toilet exhaust fan when utility power fails
I have a tiny house.
Recently my inverter failed and it could take weeks or months to have it fixed. It's a 48 V DC solar to 240 V AC, that is intermittently working with a non-working 5 kWh battery.
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Can I use a power bank to power my laptop during a blackout? [closed]
I am wondering if it's possible to use my ThinkPad L430 laptop with a power bank as a power source during a blackout. The laptop's power consumption is between ~35 to ~42 watts. Its battery is always ...
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