I recently had occasion to charge my central heating expansion vessel
(qv!), and tried to use the little 12V pump which I carry in the car for
inflating tyres. As we have a 240V->12V PSU for use with a camping
fridge. This device states that its output is 13.6V DC / 5A /68W -
surely more than adequately rated for the pump? (or maybe not?) Anyway,
plugged in, the pump simply cycled weakly at about once per second.
So purely from curiosity, why would the pump have failed to work on the
I'll second that. I got sick of mine blowing the 10A cigarette lighter
fuse every other time I used it, so lopped the plug off and fitted a
pair of crocodile clips for direct connection to the battery.
Given a spare car battery, this means I'm all set up for topping up an
expansion vessel 6ft off the ground, thus ensuring that my expansion
vessel will remain happily inflated until about a week after the pump
With Xmas coming, one of those jump start packs with compressor built in
is worth a punt. It's also a convenient easily portable source of 12 volts
for testing car bits, etc - better than a spare battery. I got one from
Lidl for 20 quid and didn't expect it to last. But it's done ok.
*The most common name in the world is Mohammed *
Dave Plowman firstname.lastname@example.org London SW
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