On Sat, Aug 3, 2013, at 08:03 PM, jerry freedomev wrote:
...
> For low cost chargers older Golf
> cart ones without circuit boards can be switched to 72vdc nom just by going
> to a full wave bridge rectifier instead of the full wave.
> ...
-
I have done this before. I took a 12V automotive charger (an old
fashion, transformer-type with a center tapped secondary using two
diodes for full wave rectification), and changed it to a 24V full wave
bridge rectified output (I was charging two 12V group 24 deep-cycle
wet-cell batteries on an e-minibike). I changed how much power I was
demanding from the transformer, so it got hot. I threw a couple cheap
120VAC box fans on it to cool it, and it worked out.
Jerry's idea is effectively doubling the power demanded from the
original design. You would need to see if you are also overheating the
transformer. And if so, you could stick a fan on it to keep it cool.
But the problem with a old fashion transformer type (dumb) charger is
that it is fast charging at the beginning, but tapers to a crawl toward
the end of the charge. You end up paying a 'charging time' cost for
going cheap.
{brucedp.150m.com}
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