Native 277/480V Three-Phase Output for C&I Distribution
Native 277/480Vac three-phase output matches the distribution voltage used by many North American commercial and industrial facilities. The IESP500UH3, IESP550UH3 and IESP600UH3 provide 50kW, 55kW and 60kW rated output respectively, while keeping the same 480V platform.
Motor-Starting Capacity up to 25HP
The 25HP motor reference gives the 60kW model a practical sizing benchmark for pumps, HVAC compressors and other C&I equipment with high starting current. The US datasheet rates motor capacity at 21HP for IESP500UH3, 23HP for IESP550UH3 and 25HP for IESP600UH3, with short-duration off-grid peak capability of up to 1.6× rated power for 10 seconds depending on model.
100% Unbalanced-Load Support for Real C&I Phase Demand
100% unbalanced-load capability allows mixed commercial branch circuits to draw unevenly across the three phases without requiring perfectly balanced demand at every moment. HVAC, pumps, lighting and other branch loads can therefore cycle independently across the 277/480V distribution system without forcing the site to maintain perfectly equal phase demand.
Dual 150–850V Battery Inputs for High-Power Storage
IESP 50–60kW US uses a high-voltage battery bus to reduce DC current at the same power level, easing current demand on cabling and protection in higher-power storage systems. The IESP US platform provides two battery inputs across a 150–850Vdc operating range, with up to 160A total charge/discharge current arranged as 80A + 80A.
Four 40A MPPTs for Large 1000V PV Arrays
Four 40A MPPTs let a large commercial PV field be divided by roof orientation or string group, while the 1000V ceiling supports longer high-voltage strings. Each MPPT is rated for up to 40A input current and 60A short-circuit current, with a 150–850V MPPT operating range and 1000V maximum PV input voltage.
North American Grid Standards
Published UL1741SB, CSA C22.2 and IEEE 1547 references give project teams concrete standards to check during permitting and utility interconnection review instead of relying on a broad grid-ready claim. The datasheet also lists UL 1741 CRD-PCS, UL1699B, CEC, SGIP and CSIP; final approval still depends on certificate scope, utility requirements and project jurisdiction.
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