I've got a Hammond 3 kva unit onboard, stamped ES2J. It's been fine until the last couple days, never buzzing or getting warm to the touch. Then about four days ago, after hooking up to shore power
for nearly a week after a year an a half of generator/solar power, it started getting extremely hot to the touch and making a dreaded (to me, at least) low/medium pitched buzzing sound.
The voltage coming out was the same that was going in (110 in, 110 out), so I don't quite understand what happened. What we did, since we're in 220v Philippines
, is use a 2kw stepdown transformer (220v to 110v) between shore power
and the Hammond, and this worked great for about four or five days before it started heating
up. The Hammond says 120v in/120v out on the plate, but I can't find much information on this unit right now, and my internet
connection doesn't work too well at the moment, I'm assuming due to decreased bandwidth from the holidays here.
I've got two questions. First, what exactly is
the Hammond unit? Is it a transformer or an isolator, or both? Neither? Second, why do I need it? It seems to me that if I'm using a functional stepdown transformer, or 'directly' plugging my inverter
into native 110v land, it would be ok so long as there aren't ridiculous voltage spikes.
I don't understand very much about this thing. Thanks for any help!
P.S. - if you reply in the next day or two, please include the body of text from whatever reference sites you suggest I check. I can't seem to load more than a handful of sites right now, but thankfully CF is one of them