APC UPS Configuration and Battery Setup

Hi everyone, I’m currently working on setting up a new APC UPS for my home server and I’m running into a few questions. I’m using the SRV20KRILRK model, which I believe is the right fit for my 20kVA requirement. The manual mentions that it can handle 3-phase output, but I’m not entirely sure how that affects the overall performance when running at full load. Does anyone have experience with this specific model operating at 20kVA with 3-phase output? I’d love to hear about your setups and any tips you might have.

Another thing I’m a bit confused about is the battery configuration. The manual suggests using SRV120RLBP2-9A batteries, but I’m wondering if I need to connect two of them in series to achieve the required 380V output. If that’s the case, how does that impact the runtime testing? Is it tested under 1-phase or 3-phase conditions? I’m trying to plan for the worst-case scenario, so any insights would be really helpful.

I also came across a mention of the FS3000-1005 Qwiic Air Velocity Sensor in one of the posts. I’m curious if anyone has integrated this sensor with Home Assistant and how it performs in real-world conditions. Any advice or experiences to share would be greatly appreciated!

Thanks in advance for your help and insights. I’m looking forward to hearing from you all!