Idea for batteries

Thread Starter

Martyk

Joined Jul 23, 2009
25
Hi all

I have two 80v lawn mower battery packs that are doing nothing most of the summer, and nothing at all during the winter.
I would like to use them for a backup power source around the house, but DC-DC converters (down to say 5 or 12v @ 1A) in this range are far too expensive.
Anybody have any suggestions other than a zener diode?

Tks
 

LowQCab

Joined Nov 6, 2012
2,054
You don't want a Buck-Converter with that wide of a Voltage range.
80-Volts is somewhat unusually high, this tends to complicate matters a little.

What do You call "expensive" ?, ~$100.oo ?,
and,
are You experienced enough to Build it Yourself ?
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Alec_t

Joined Sep 17, 2013
12,812
You could experiment with a spare cheapo mains-powered AC-to-DC switch-mode wall-wart (e.g. a USB charger). You will probably find it will happily accept 80V DC input. Internally it rectifies the mains input to high voltage DC before bucking it down to a lower output voltage. If you want, say, 1A at the lower voltage then use a 2A output rated wall-wart, because the rectifier diode(s) will be operating continuously instead of on alternate half-cycles of an input waveform.
 
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