EMS Control Logic: Turning Economy and Reliability into SOC Rules
Summary: EMS is strategy and coordination; PCS is execution and conversion. SOC banding, peak-valley arbitrage, anti-backflow and remote O&M with AEMS.
EMS vs PCS division
EMS is "strategy and coordination"; PCS is "execution and conversion" — clear roles make planning efficient.
SOC banding (confirm on site)
- SOC high 80–100%: prioritise load/peak shaving; allow surplus to grid.
- SOC normal 30–80%: renewables first, battery smooths power, charge/discharge by tariff.
- SOC low 20–30%: limit discharge; prepare diesel or grid top-up.
- SOC too low <20%: protective mode; diesel/grid forced top-up; keep critical loads.
Core functions
Self-consumption, surplus to grid, peak-valley arbitrage (time function), self-use+backup, meter anti-backflow, remote monitoring/waveform/upgrade/alarm. VGRID AEMS100/200/300/400/500 dispatches PCS, BMS, PV, grid, diesel and loads, with cloud access.
Reminder
SOC thresholds are not fixed — set them with backup goals, load criticality, tariffs, diesel cost and battery strategy.
FAQ
Can EMS directly control the PCS?
Yes. Via RS485/CAN/4G it dispatches PCS, BMS, STS and diesel, executing charge/discharge and transfer strategies.
How is peak-valley arbitrage realised?
EMS charges in off-peak and discharges in peak by tariff, under anti-backflow and backup constraints.
Is EMS required for anti-backflow?
For grid-tied sites that must not export, anti-backflow (meter + EMS strategy) is required.
How many devices does AEMS manage?
Up to 6 PCS and 6 MPPT, with WiFi/4G cloud comms and local HMI.
