# How to Read a PCS Specification Sheet (Energy Storage Converter Datasheet) Item-by-item breakdown of an energy storage converter datasheet: rated power, on-grid/off-grid switching time, number of MPPT channels, efficiency, ingress protection rating, and the certificates that should be requested. When selecting an energy storage converter (PCS), the specification sheet is the most critical basis for comparison. The following fields must be clearly understood. Rated Power and Overload Look at continuous power and short-time overload capability (such as 110% long-term, 150% for seconds) to match load peaks. Grid-Tied/Off-Grid Switching Time Switching time <10ms is required to ensure critical loads are not interrupted; off-grid scenarios require confirmation of black start capability. Efficiency and MPPT Maximum efficiency (often 98%+) and European efficiency reflect losses; multiple MPPT channels are beneficial for strings with multiple orientations. Protection and Certifications Confirm IP rating and operating temperature range, and request certificates such as CE, IEC 62109, UN38.3, etc. Key Points Grid-tied/off-grid switching time <10ms protects critical loads Maximum efficiency often 98%+, look at European efficiency Multiple MPPT channels adapt to multiple orientations Request CE / IEC 62109 / UN38.3 certificates