Re: Recommendations for a UPS?

[Bret Busby <bret@busby.net>]

On 1/8/23 02:41, Jeffrey Walton wrote:
> On Mon, Jul 31, 2023 at 2:13 PM Tom Browder <tom.browder@gmail.com> wrote:
> > I used to use UPS units from APC back when you could replace the battery. I haven't had an UPS (but always on a surge protecter) for awhile, but electricity (now FPL) is not as reliable in my new location and I need one.
> >
> > All the reviews I've seen on Amazon for smaller capacity UPSs for APC and Tripp Lite are not that great (I usually concentrate on the one- and two-star reviews).
> >
> > Any recommenndations from fellow Debian folks?
>
> I put them on all my electronic devices. We use about 13 of them
> throughout the house. There is one at the ONT, one at the router, one
> at each tv/cable box, and one for each computer in the house. In my
> test lab in the basement, I keep a few computers grouped together and
> plugged into one UPS. I have 4 groups, so I need four UPSes.
>
> Our use case is an occasional power outage of several minutes,
> brown-outs and dirty power. If power looks like it is going to be out
> longer, I turn on our backup generator. It produces _really_ dirty
> power. Total Harmonic Distortion (THD) is between 15% and 20%.
>
> We use the 425 VAC units [1] and 600 VAC units [2], depending on the load.
>
> [1] https://www.amazon.com/gp/product/B01HDC236Q
> [2] https://www.amazon.com/gp/product/B01FWAZEIU


With all of that, including 13 UPS's, I wonder whether it would not be 
more feasible to buy a household BESS with a capacity of 10kWh, and a 
dedicated inverter, to provide a single UPS.

Having replaced/upgraded our household rooftop photovoltaic system last 
year, I got a 19kW BESS connected to a hybrid inverter that provides UPS 
(switchover time less than 10ms), with it configured to retain 25% 
(about 4kWh) for reserve power. With that, we have gone through multiple 
grid power outages, of several hours long, each, with no loss of 
electricity supply to the house. The whole of the household, is on the 
protected circuit (apart from a bore pump, and a solar HWS booster 
element, which has not been turned on for a few years).

..
Bret Busby
Armadale
West Australia
(UTC+0800)
..............