Traditional AC-coupled systems convert PV → AC → DC twice on the way to a battery or charger. DC-coupled systems share a common DC bus — fewer conversions, higher efficiency, lower BOS cost.
PV array
Boost MPPT
DC bus + Battery
Bi-directional buck/boost
EV chargers
Four properties built into every EDCS module — whether sized for PV input, battery management, or EV charging output.
Constant-V · bi-directional constant-V · constant-I · constant-power · boost MPPT · buck MPPT — all firmware-selectable. Same hardware works as PV input converter, battery DCDC, or EV charger output. One spare part across roles.
Three-level topology with optimized switching frequency. Stable efficiency across the full power range — not just at the spec sheet peak point. Translates directly to less heat, less cooling cost, more energy delivered to load.
Up to 16 modules paralleled on a common DC bus — gives 800-1000 kW per cluster from 50/63 kW modules. Master-slave coordination via CAN; loss of any single unit triggers automatic load redistribution.
Specialized pre-charge mode for connecting deeply-discharged batteries to a live DC bus without inrush damage. Critical for sodium-ion batteries (which can sit at 0V) and for cold-weather LFP recovery.
For full technical parameters across communication, control, environment, and certifications, download the complete datasheet below.
From procurement shortlists to commissioning — the ten questions we hear most often during technical due diligence.
Yes. The EDCS50-M-MH and EDCS63-M-MH are identical hardware — they switch operating modes via firmware configuration. One physical SKU plays three roles in a DC-coupled system:
(1) Boost MPPT mode for PV input — tracks PV array maximum power point. (2) Bi-directional constant-V mode for battery — handles charge and discharge across full SoC range. (3) Buck mode for DC fast charging output — regulates output voltage to charger requirements.
This means one spare part covers your whole DC bus — substantially simpler than stocking three different inverter SKUs.
Same form factor, same operating modes, same firmware. Only difference is rated power: 50 kW continuous vs 63 kW continuous. Use 63 kW where you need maximum density per cabinet position; use 50 kW where cost is more sensitive than power per slot.
Both can be mixed in the same DC bus cluster — the master controller handles unequal capacities automatically.
Yes — the EDCS series specifically supports sodium-ion through two features other DCDC products often lack:
First, the LV side voltage range goes down to 0 V (vs typical 200 V minimum). Sodium-ion cells can sit at very low voltage (close to 0 V) without damage, but most DCDC modules can’t reconnect to a 0-V battery without inrush damage.
Second, the dedicated zero-V pre-charging mode safely brings a deeply discharged battery up to operating voltage. We’ve validated this in field deployments since 2024.
For PV-to-battery path: AC-coupled goes through PV inverter (98%) + battery PCS (98%) = ~96% round-trip into the battery. DC-coupled goes through one DCDC stage at 99% = roughly 3-4% efficiency advantage. Over 20-year asset life this translates to material energy savings.
For PV-to-EV-charger path the advantage is similar. AC-coupled needs PV inverter + EV charger AC input + EV charger internal DC stage. DC-coupled goes PV → DC bus → buck stage → EV battery, eliminating two conversions.
MPPT operates from 200 V to 1000 V on the HV side, with full power tracking across 400-950 V. MPPT accuracy is > 99.5% (industry-standard test conditions). Tracking algorithm responds to irradiance changes within 50 ms — fast enough for cloud-edge transitions without missing energy harvest.
For PV strings outside the 400-950 V optimal range, contact engineering — alternative module configurations or transformer adaptation may be needed.
Yes. A typical hybrid site has, on the same DC bus: 4 × EDCS in PV-input MPPT mode, 4 × EDCS in battery bi-directional mode, and 4 × EDCS in EV charger output mode — all 12 modules sharing the bus voltage and coordinated by the master EMS.
The DC bus voltage is set by the battery DCDC (typically 750 V or 1000 V depending on battery configuration). PV-input modules track battery DC bus voltage; EV-output modules buck down to charger requirements.
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