Microgrid Fundamentals
VGRID microgrid fundamentals and selection guides.
What Is a PCS (Power Conversion System)? PCS vs PV Inverter vs Hybrid Inverter
Understand what a battery PCS is, its core role, and how it differs from PV inverters, hybrid inverters, DC/DC and STS in a microgrid.
Grid-Tied vs Off-Grid vs Grid-Forming (GFL/GFM): What Actually Differs
The real difference is one question: who provides the voltage and frequency reference? A clear explainer of GFL, off-grid and grid-forming for microgrids.
AC Coupling vs DC Coupling: Where Should PV Connect?
Neither is "better" — they fit different project conditions. A practical comparison of AC vs DC coupling with VGRID MPPT/DC-DC options.
What Makes Up a Microgrid? PCS/BMS/EMS/MPPT/DC-DC/STS Roles
Read a topology by finding the bus, then energy inputs, then control lines. A clear map of microgrid component roles and coordination.
How to Read a PCS / BESS Datasheet: 8 Parameters That Decide Sizing
Don’t memorise every row. Focus on the 8 parameters that decide selection: power, battery voltage window, DC current, grid/off-grid, overload, efficiency, THD/PF, IP/temp/altitude.
European-standard PCS to US-standard voltage: N conductor return path design pitfalls under single-phase loads
Drawing on a Mexican solar-plus-storage project case, this analyzes the missing N conductor return path caused by single-phase loads when a European-standard 400 V PCS is stepped to US-standard voltage via a transformer, along with corrective approaches.