Two of my 1500VA units have now died and were not worth my time repairing so now I'm down to one small one for the Home Theatre and two big ones for the storm pumps.
The problem with these old units is they are NOT tolerant of operating on generator power and as their batteries age, it now costs a minimum of $480 for the small ones and $1200 for the big ones, just to buy replacement batteries!
So I decided to do something I've wanted to do for ages, that is to buy a good full-conversion Uninterruptible Power Supply (UPS) which will:
- operate on the generator during extended outages so I don't need as much battery capacity
- provide true "clean" power for all the computers and home theatre equipment
- cost less to upgrade batteries for, in the future.
It was promptly delivered and I powered it up.
Now understand that I've handled many UPS models and sizes, but none of that prepared me for the noise that assaulted my ears when I powered this baby up!
It was competing with some of the 10kVA systems I've worked on!
Two little 80mm cheap-as-chips case fans were managing to produce a cool 51DB of noise (at the standard 1m measuring distance)!!
In a quiet office when you're trying to have a hands-free/conference phone conversation .... nah! ... that's just not doable!
After some more Google searching I discovered this was another well-known problem (though why I didn't see it in my pre-purchase research I'm not sure) ... wasn't expecting noise to be an issue I guess.
Long story short, I obtained permission from the supplier to swap out the fans for two "silent" high-flow equivalents, without voiding my warranty.
I've yet to press it fully into service but at-least its 'ready' now and seems to be more efficient than the old line-interactive one it will replace :-)