It all depends on what you call modular. Each manufacturer does this differently. Modular to me is, the ablity to add more capacity or redundanancy. This means that most UPS manufacturers can do this.
Modular UPS that I know of in the US market.
APC InfraStruXure, Symmetra, Silcon
Powerware 9170, bladeUPS, 9315, 9390, 9395
Liebert NX, Npower, NX-L, Series 600, Series 600T, Series 610, Nfinity, GXT2
Modular means the ability to add to an existing system and ability to hot-swap.
Gamatronic offer true hot swappable modules. Newave 94.5%, APC 94%, Powerware Blade 90.5 but Gamatronic are 96% efficient. Gamatronic 10kVA modules weigh 9kgs so one person can change without even going into bypass. Powerare 12kW modules weigh 61kgs, APC 10kW 26kgs and Newave 16kW 33kgs. Gamatronic Power+ uses 10kVA modules and new Mega Power+ 25kW modules still only weigh 32kgs.
This is modular UPS manufacturers from China.-Shenzhen INVT Power System Co., Ltd
we have reliable function with competitive price for modular UPS..
Our web and mail as following: