1. Lead acid batteries need to be between -20C to +50C for charging or discharging. 2. Especially in hot climates, inverters in the UPS need to be kept cool.

1. Lead acid batteries need to be between -20C to +50C for charging or discharging. 2. Especially in hot climates, inverters in the UPS need to be kept cool. 3. I assume that by keeping the UPS & batteries inside the building, you minimize transmission loss/voltage drops so you don't have to oversize your conductors.