24 V home made lead acid battery charger: basics & important things when constructing

Basics about how to make a 24 V lead acid battery charger.

The transformer and the (series or not) regulator (MOSFET or classical NPN or PNP transistor) must be properly mounted on a cooling heatsink that must be ventilated via a 12 V ventilator to keep the heatsink of the series regulator and the heatsink of the bridge rectifier cool & vented during charging.

Ventilating and cooling the transformer itself is also very (!) important and often forgotten.

Also often forgotten: that the ventilator must blow completely alongside the transformer and its coil & that the transformer must be vented “everywhere”, it must stand in free air, so also from the under-side of the plate on which the transformer is mounted.

Otherwise (when clamped) heat can get “stored” in the laminated iron core, that can give a “meltdown” on the longer term.

Of course: this is all old school technology.

So: a classical 230 V-50 Hz or 110 V-60 Hz transformer, classical bridge rectifier circuit (everywhere to be found on the www) and a classical series – regulator, published many times on my YT channel and to be found everywhere on the www.

All the videos hat I have published on You Tube can be found via my Channel Trailer: Link is

In thematic order you can find these video’s under the “comments” section.

Important: to find all the links to the (+/-750) video’s on my YT Channel, select, in the comments section, “NEWEST FIRST”

My books about electronics are available via the website from “Lulu”, search for author “Ko Tilman” there.


There is an important video via which you can buy a document where I give links to many of my video’s, published between 2010 and 2018.

Link is: https://youtu.be/XXRsA24NUE0

My books are also available via Barnes and Noble and via Amazon.
Regarding all my video’s: I constantly keep them actual, so the original video’s with the most recent information are always on YouTube. That is the source, and search there. When my video’s are reproduced or re-edited on other websites/channels you can not (!) be sure about the original content (=really working electronics) and important adaptations to the circuits.

Be aware of that, I saw on the internet my circuits reproduced in a poor or even not proper way. I can not help that, sorry. Upload 28 May 2019.


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