Questions tagged [ups]
A UPS is an Uninterruptible Power Supply that provides backup power when the main power source is lost. Questions on repairing commercial ones are generally off topic.
395 questions
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Dashboard for a PSC-35A power supply UPS
I'm using an UPS power supply PSC-35A by MeanWell.
Here its datasheet link.
This table represent the output pinout:
I need to create a dashboard with the following LEDs:
AC OK
LOW BATT
12V DC OK
...
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5V 4A UPS from 12V UPS modules
I am planning to making a high amperage 5V UPS from x2 parallel 12V 1A UPS modules My power source can provide 12V 3A so x2 parallel 12V UPS module output will be 12x1x2=24W when its is step-downed to ...
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Homemade UPS: I want my relay to activate quickly when it drops below 12V using a zener diode
It works correctly in the diagram. My only question is how I should place the resistor and what value, because some people say the zener diode can break without a resistor.
In the diagram, the common ...
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UPS for RaspberryPi
I am working on a project where a sensor connected to a RaspberryPi continuously takes readings from the environment. The data collected is saved on an hourly basis.
I am trying to take the prototype ...
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THDV and voltage dip for generator sizing
I’m using the Cummins GEN SIZE website to perform generator sizing, and I’d like to understand how the software calculates THDV% (Total Harmonic Distortion of Voltage) across all load steps. This ...
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Charging 12 volt UPS VRLA battery
I have a few UPS 12 Volts(Nominal Voltage 12V (8-9 AH
VRLA batteries, which are old (sitting for the past 3-6 years) and at various levels of charged-status. Some of them show 6 to 8 volts and other ...
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Trying to understand a battery protection circuit from an uninterruptible power supply
I'm trying to understand a battery charge/discharge protection circuit integrated into a UPS (uninterruptible power supply) module sold by a Chinese reseller (Waveshare). Here's the link to the ...
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How can I determine from its circuit if this UPS is safe for a raspberry pi in terms of fire?
I have a commercial 5 VDC ouput UPS module intended to provide non-interupted 5VDC output in the event of mains failure.
A circuit diagram, substantial technical details and multiple photos are ...
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12V 3A 'homebrew' UPS switchover
I am not a circuit designer but looking for advice on attached that will switch to battery backup when main PSU (top LHS of diagram) goes down. My choice of components was based on max 3A load. LED ...
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Which sealed-lead acid (SLA) battery charging pattern is best for use in a UPS?
I'm building a line-voltage controller for a MeanWell 3-stage battery charger which charges a 100 Ah SLA battery. I'm considering having the controller either stay on as long as there is line power, ...
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TP4056 load sharing problem, output voltage fluctuates from 2.5 to battery voltage (4~4.2 V)
I'm trying to build a Li-ion battery charger with a TP4056 module (with battery protection) with load sharing so that the connected ESP32 doesn't restart when the external power supply is turned off. ...
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How to build DIY home energy backup system (UPS) [closed]
I have a home in a countryside where grid power cuts off very often (3-5 times per week) for a few hours, especially in a winter time.
I came up an idea to make a backup system that will automatically ...
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Switchover Contactor Logic
The contactor logic in the image is for a switchover power supply (from Grid power to PV inverter EPS/UPS output):
The idea is that when there is a grid fault, then T1 changes state. This causes K1 (...
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Simple UPS for Microcontroller
Without regard to protection from draining the battery, for example if power outages were only a few seconds, can anyone see any problems with this simple design for supplying a low demand ...
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Switching between battery and charger [closed]
I have the battery and charger. The essence of this simple circuit is that the device (in our case, the LED) is powered by the charger when it is active, and by the battery when it is not. The battery ...
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