I actually built my own 2 kWh battery setup after finding available commercial UPS overpriced.
It took some work and cost me about 2000 euro, but now I run everything (including networking, servers and monitor) directly on a battery feed DC net in my house.
It's pretty cool too have all IT equipment unaffected by a power outage.
It’s very homemade, but I believe it’s built like a DC net for a boat. It’s a bluetooth connected lithium battery, boat cabling and fuse boxes and Victron charger and voltage transformers.
I built it with “subnets” for different voltages. The battery is 24 V which feeds servers and a 34” monitor, then a transformer to 12 V for network gear, and several 5 V (USB) for a rack of raspberry pis. The is also a small 230 V transformer, for some gear that have built in PSU.
The largest server is fitted with a custom DC PSU I found on e-bay, others are normal external PSU where I cut the cables.