[NANOG] Re: Small Capacity UPS

[Mark Tinka via NANOG <nanog () lists nanog org>]

On 4/8/25 14:29, ic via NANOG wrote:
> Hi,
>
> > On 6 Apr 2025, at 20:55, Mike Hammett via NANOG <nanog () lists nanog org> wrote:
> >
> > I'm trying to find something that keeps my customer's network gear online for a meaningful amount of time. The challenge is that an 
> > ONT, firewall, switch, AP, and some IP phones doesn't add up to be very much load. Most normal UPSes get terribly inefficient at lower load 
> > ratings. Add up all of the network devices a customer may have and we rarely break 50 watts of load. Normal, small UPSes are lucky to break 50% 
> > efficiency at those loads whereas they may be 95% efficient at say 100 or 200 watts. Get a bigger unit with a bigger battery and now you're 
> > even less efficient. Get a big enough unit to have extendable batteries and now you're spending thousands of dollars for such a small 
> > request.
> >
> > I've gone asking, but haven't really gotten anywhere. The best technical solution was from some electronics parts nerds that 
> > was basically to build my own small rectifier and battery system. Great. I can achieve high efficiencies with small loads, letting me 
> > have say 4 or 8 hours of battery. However, I've got a science project, not something I can deploy at a customer.
> >
> > I'm hoping one of you has the magic bullet in what product a service provider should use in this scenario.
> >
> > Oh, and of course, being able to centrally manage them from my own iron would be great too.  :-)
> For places which are not proper IT cabinets, I’d go with something like https://us.ecoflow.com/ - most (if not all) 
> support charging while output is on, and you get the extra benefit of being able to add a solar panel if you want to.

I recall spending some time reviewing the Ecoflow Delta 2, which was 
about US$799 a year ago, but now seems to be going for US$479 today. Not 
bad for a solar-supported, pre-built 1.2kWh LFP battery system:

https://us.ecoflow.com/products/delta-2-smart-extra-battery?variant=40573812408393


> Not sure about the efficiency though.

Not very good, from a number of reports I found of people who bought it.

Numbers are in the range of 83% @ 200W to 90% @ 1kW. Not very good 
numbers. Worse if you have a lower load, because feedback is that this 
unit has an operating overhead of 41W, which is super high.

That said, may just be what the OP is looking for.

Mark.
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