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How do i build a UPS to power my boiler during power outages

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The first thing you need to do before you think about building it is to determine how much power do you need. Are you trying to just run the control system or are you also trying to also run pumps and motors? How much current at what voltage does it take to run each device? How long you need to run them? These answers will determine how large a battery and how large of an inverter you need. Then you can decide if a UPS would be cheaper to build and maintain, or if a generator is the better solution. By now you are probably realizing that this is not a simple project.

Jim at

Posted on Dec 20, 2014

  • Jameswa40 Dec 20, 2014

    This can be a very complex project depending on what you need to power. Control circuits usually do not require much power but motors and pumps can require a lot. Determine the current required for each item that must be powered and the operating voltage of each item. Then decide how long you need to be able to power your boiler. Then you can calculate the size and cost of the battery and the inverter. You can also calculate the size of generator to do the job. If you are still interested in investigating this very complex project I can help you calculate the size of the battery required, which would allow the calculation of the size of the inverter and a generator. You can contact me at


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Posted on Jan 02, 2017

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SOURCE: UPS Fails during power outage

Probably batteries are shot.

Posted on Mar 16, 2008

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SOURCE: Uninterruptible Power Supply problems. My

First, we do need to full charge it. Then see what's being able to pick up a load of this Ups power or not? If not then it means something is wrong with this Ups. Please put this change.

Posted on Jun 30, 2010

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Why is it our computer server keeps on rebooting or ups can't properly function during black out?

Without further information as to the exact symptoms, it is important to point out that UPSs are only meant to function for a short amount of time (between 3 and 30 minutes, depending on model). The UPS will simply run out of battery power after that time. If the UPS has a computer interface, it may instruct the server to shut down when primary power is lost to prevent data destruction.

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First, we do need to full charge it. Then see what's being able to pick up a load of this Ups power or not? If not then it means something is wrong with this Ups. Please put this change.

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What problems do these technologies solve in UPS?

1. Provide conditioned clean AC power to computers & other peripherals (except laser printers, which should not be powered by UPS).
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