Introducing Okaya’s POWER MAX UPS Series, a groundbreaking solution in commercial power management. This robust range of high-capacity UPS systems is meticulously engineered to deliver exceptional reliability and performance, ensuring your critical power needs are consistently met with excellence. Hi-Capacity UPS is crucial for residential and commercial spaces which can power larger loads and sensitive appliances such as Mixer grinders, water pumps, heater, deep freezer, fuel dispensers, dental chairs, processing facilities, and critical medical equipment, telecom equipment, ACs, etc.

Energy
Efficient
Appliance
Friendly
Max. Load*
Handling
Advanced
TrueSine Wave

*Appliance suitability depends on Inverter and Battery capacity.
** Time to reach 60% SOC of battery is 15% less with OKAYA Inverter, as per the inverter charging profile.


Discover Okaya’s wide range of Advanced Inverter Batteries, built for reliable backup and long-lasting performance. Choose from multiple capacities and warranty options designed to match every household and business need with trusted power you can depend on.
Discover NowOkaya's POWER MAX Hi-Capacity UPS (also called a high-capacity inverter) is available in four models: ATSW 3050 (2500 VA, 24V), ATSW 3750 (3200 VA, 24V), ATSW 4550 (4000 VA, 48V), and ATSW 6650 (6100 VA, 48V). It handles loads that standard home UPS or home inverter systems (700 VA to 2000 VA) cannot support -- including ACs, deep freezers, water pumps, heaters, mixer grinders, fuel dispensers, dental chairs, ventilators, medical equipment, fire pumps, and 3-phase motorized appliances. All four models use Advanced True Sine Wave technology and carry a 36-month warranty.
Okaya's POWER MAX Hi-Capacity UPS is designed for: corporate offices and data centers (computers, printers, projectors, scanners), banks and ATMs, cinemas and shopping malls, petrol pumps and fuel dispensing stations, clinics and hospitals (dental chairs, ventilators, critical medical equipment), gyms and fitness centers, telecom infrastructure, water coolers, fire pumps, compressors, and emergency power for critical systems. It also serves as a portable power backup solution for high-demand applications where grid interruptions cannot be tolerated.
Yes -- all four POWER MAX models use Advanced True Sine Wave technology and superior peak current handling designed for motorized loads including ACs. The ATSW 3050 (2500 VA) and above are suited for AC support depending on tonnage and connected load. As a general reference, a 1-ton inverter AC typically requires approximately 1500 to 2000 VA at startup -- the ATSW 3050 provides headroom for the AC plus other essential loads simultaneously. Confirm the right model with Okaya Customer Care based on your specific AC rating and total connected load.
NTC (Negative Temperature Coefficient) Technology provides two-stage thermal protection in Okaya's POWER MAX series. It continuously monitors temperature and responds before critical thresholds are reached -- preventing burnouts in the inverter's power devices and transformers during sustained high-load operation. For commercial environments where equipment runs continuously and high current flows are common, NTC two-stage thermal protection significantly reduces inverter failure risk -- a level of protection that standard home inverters do not provide.
The specially designed EI Core in Okaya's POWER MAX series minimizes heat generation and power loss with at least 20 to 25% lower watt loss than standard transformer cores, increasing load handling capacity and extending the UPS operational lifespan. Super Intelli Charge enables 15% faster battery charging using a Boost to Float mode, achieving 60% battery charge in significantly less time after a deep discharge -- critical for commercial setups where backup readiness must be restored quickly between power outages.
All four POWER MAX models (ATSW 3050, ATSW 3750, ATSW 4550, and ATSW 6650) carry a 36-month warranty. Built-in safety protections include: NTC two-stage thermal protection (prevents power device and transformer burnouts), short-circuit protection, reverse polarity protection, overload protection, battery deep discharge protection, and audio plus display indication for real-time status monitoring. These features together ensure safe, continuous operation for both the connected commercial equipment and the Hi-Capacity UPS itself.
At OKAYA, we offer a wide range of power solutions for various applications. Take a look today!