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I am trying to run a WiFi router from a 12V lead acid UPS battery.

To get a stable 12V output from the battery I used an LM2596.

The problem is that the output is always 8.28V-8.50V. No matter how many times I spin the potentiometer the output is 8.28V.

Is this a wrong approach to get stable 12V DC from a 12V lead acid battery?

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2 Answers 2

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LM2596 is a buck converter. It can only lower voltage. The parameter you are interested in is called "dropout voltage". To get stabilized 12V from an "approximate" 12V source you need a buck-boost converter.

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Instead of LM2596(Buck converter) you should use XL6019 buck-boost converter. As Lead-acid provide voltage between 14.2v (Full charge) to 10.8 (at 90% discharge).

So XL6019 can automatically step-up and step-down these voltages for 12v fix output

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