48 volt regulator circuit

craigk · September 2019

Hi Folks! have a 48 volt off-grid system, with an inverter. Some loads I run directly off the battery bank, such as the fridge. I would like to try to run a security system comprised of components that will run 48 volts. The issue is that the battery voltage varies between 49 to 59 volts. I wonder if anyone has experience with a small regulator circuit to control the battery bank voltage to get a regulated 48 volt supply?

BB. · September 2019

What you need is a "buck boost" DC to DC converter... The buck circuit drops voltage, and the boost circuit raises voltage. To get an output that outputs 48 VDC from 40-64 VDC, the buck boost is the way to go.

If you were running from 48 to 24 VDC, then a buck is all you need. If running from 24 to 48 vdc, then you need the boost.

Something like this buck/boost converters... However I am not finding any that run in the 48-60+ VDC range:

https://www.amazon.com/s?k=%2Bbuck+%2Bboost+dc+converter
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=DC+to+DC+Power+Converter+Voltage+Converter+%2BBoost+%2Bbuck

Maybe somebody knows some off the self 48VDC DC to DC converters?

-Bill

mike95490 · September 2019

Also, look for DC-DC converters, you likely only need 50w or so?

https://www.digikey.com/products/en/power-supplies-external-internal-off-board/dc-dc-converters/132?k=DC-DC

craigk · September 2019

Thanks Gentleman. I have seen circuits on Ebay and Aliexpress that look like they will do the job (250 watts or so) but I can't get a straight answer out of anyone when I inquire, so I guess I'll just have to try one. None of them specifically describe working when the input is nearly the same as the output.

48 volt regulator circuit

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