Power Inverters arrived.
These units are marine power supplies, more commonly used now in off-grid applications.
There is a very serious reason we don't use computer grade UPS units and that is that they are hopelessly inadequate, and to be honest, junk.
The main problem is lifespan. Most datacentre installs are 5 to 8 year life expectation and the equipment is designed with that in mind. The units with integral batteries often use specific non-standard batteries which you'd be hard pressed to find in 8 years time. The units are often "value engineered" to close specifications especially with regard to lifespan, but also with regard to load. All too often the inverter output is less than ideal, and hates dynamic load changes. We've blown many computer grade UPS units trying to drive serious power amplifiers from them.
These units are off-line UPS units. That means when the grid is running fine they just sit there maintaining the batteries with a hardware bypass. they will kick in in less than one cycle and do not affect any equipment connected to them, they are also synchronous.
Another issue is trying to find a 100KW SINGLE PHASE UPS system.... no chance, they're all 3 phase when you get to that power.
Our power cleanliness relies on a direct feed from the 11KV transformer. Quite simply with a 600A feeder direct from the 11KV you just won't get brownouts or surges, or anything imposed upon your neutrals or earths.
Power conditioners are just sticking plasters on a bigger problem, it's far easier to fix the problem in the first place than use some bodge of a solution that is only half effective. Most power conditioners just transfer the problem somewhere else.
No inverter is as good or as solid as clean grid power, no inverter can even hope to deliver the peak load current that clean grid can.
Our measured short circuit current capacity on the audio supply (from grid) was 7,000 amps!!! So was the short to earth capacity!!
All power circuits are over specified cable wise. in many cases we have used 6mm cable on 16A lines. There is a good reason for this, induced currents can't flow easily in a line that has a very low resistance, also a line with little loss and very low impedence will not have a big electromagnetic field. So, over-spec all the cables.
I can't believe how "angry" electricians get when you ask them to do this.... NOOOOO they say, "you don't need such a cable", but what do they know, they fit heaters and lightbulbs, 5v loss is fine for them, they don't care that the cable is radiating a huge 50 or 60Hz EMF. We do.
These inverter units are connected in parallel, we have 9 x 10KW units each capable of a 200% peak load capacity, and all happy with highly dynamic loads such as power amplifiers or motors. With all connected in parallel we have a 180,000 watt peak current delivery from battery.
Power clenliness tests at the end of the project proved that we had no measurable noise at all. Measured S/N range on the 54 loudspeakers all running in the dubbing theatre was 110dB, totally unheard of in such a large installation.
It is also ABSOLUTELY ESSENTIAL to manage cable layout over the entire project and avoid every possible loop in power or grounding runs, remembering that audio, video, and data cables are also part of the grounding circuit. Running power cables down one side of the room, and audio, data or video down the other side is just daft and is asking for problems.
The inverters are programmable as to kick in and out thresholds. We have set them at 200 to 245 volts. Within that range they stay offline, anything out of that and they kick in and stabilise the voltage to exactly 220. They are also programmed to kick in if there is any frequency variation.
Details here. Quattro / 3kVA - 5kVA - 8kVA - 10kVA - Victron Energy