How to Choose ATS, STS, and NTS in Energy Storage Systems?

Application Scenarios & Recommendations

ATS
Suitable for non-critical loads such as fire lighting, air conditioners, general power distribution. Allows second-level outage. Economical and reliable.

STS
Ideal for sensitive loads like data centers, telecom rooms, electronic production lines. Requires two power sources to be nearly synchronized and in-phase. Load hardly perceives the transfer.

NTS
Designed for “zero-tolerance” applications such as semiconductor manufacturing, precision medical equipment, high-end automation. Can deeply integrate with energy storage to switch to battery power within 2ms – completely uninterrupted.

3 Steps for Selecting in Energy Storage Systems

1. Check load tolerance

   1s → ATS
   10–50ms → STS (requires synchronized sources)
   <2ms or zero interruption → NTS

2. Evaluate power source conditions
   If the two sources are hard to synchronize, STS performance is limited – prioritize NTS or ATS.

3. Calculate ROI
   In high-end manufacturing, the loss from one production interruption often exceeds the cost of NTS – choose NTS decisively.