C&I Energy Storage Design: From Self-Consumption to Peak Arbitrage
Summary: C&I PV-storage needs daily self-use and automatic load carry during outages. Configuration, SOC strategy, anti-backflow and VGRID PCS/all-in-one options.
Configuration goal
Daily self-consumption and peak-shaving plus automatic load carry during outages; diesel (if any) auto-relays at low SOC.
Typical configuration paths
- Retrofit PV (AC coupling): keep existing PV inverter, add PCS or all-in-one charging/discharging per EMS.
- New PV-storage (DC coupling): MPPT+DC/DC for DC-side combiner, fewer stages.
- High backup need: built-in/standalone STS for <10ms/<20ms transfer.
SOC and strategy
EMS runs self-use, peak arbitrage, backup and anti-backflow by SOC bands; undefined pairs with undefined capability. Use cases: factory/park backup, PV-charging, construction/emergency.
FAQ
How large a C&I storage?
Size by daily load curve, tariff spread and backup duration; from hundreds of kWh to MWh. Do a load/PV assessment first.
Is anti-backflow mandatory?
Required where export is prohibited — via meter + EMS strategy to avoid penalties and grid impact.
Key to peak-arbitrage revenue?
Tariff spread, round-trip efficiency (PCS/system) and battery degradation; EMS executes by tariff time function.
All-in-one or PCS for factory backup?
Standard skid delivery → all-in-one (H54PSSTD); modular expansion or OEM → PCS module (SP125HCPS).
