ZT-REES-HV-ST-8k Residential Energy Storage System High-Voltage | Stackable | 8kWh The ZTTEK Hearth HV-8k is a high-voltage 8 kWh LFP energy storage module designed for DC-coupled solar integration. Each module operates with an independent BMS for precise protection and long-term stability. The clean bottom-side wiring architecture simplifies professional installation, and the system expands to 128 kWh — making it suitable for homes, commercial spaces, and multi-site project deployments.

High-Efficiency DC-Coupled Operation

Direct DC bus coupling eliminates the AC–DC–AC conversion losses present in AC-coupled energy storage systems.
- Higher overall round-trip efficiency vs. AC-coupled ESS
- Optimized for use with hybrid inverters in DC-coupled PV systems
- Reduces annual energy losses across the system lifetime

High-Density 314Ah LFP Cells

Large-cell LFP chemistry for high cycle life, low thermal stress, and stable long-term performance.
- Cell capacity: 314 Ah; rated energy: 8 kWh per module
- Cycle life: ≥6,000 cycles @ 80% DoD
- Natural convection cooling — no active cooling components required
- Charge temperature: 0°C to 55°C; discharge: -20°C to 55°C

Independent BMS per Module

Per-module battery management enables reliable mixing of new and existing modules across the system lifetime.
- Each module independently manages SOC, protection, and fault response
- Supports mixing modules of different ages without performance compromise
- Improves overall system reliability and long-term stability
- Nominal voltage: 550 V per module

Scalable Up to 128 kWh

Modular expansion architecture from a single home installation to multi-unit project deployments.
- Up to 6 modules per string; up to 16 battery modules total
- Max. charge/discharge: 0.5P; peak output: 4 kW per module
- Suitable for homes, commercial buildings, workshops, and small facilities
- Phased investment supported — add modules as energy needs grow

Clean Wiring for Professional Installation

Designed to minimize installation complexity and reduce on-site labor time.
- Single battery combiner connection to hybrid inverter
- Battery columns connected via bottom-side parallel wiring
- Quick-plug connectors throughout
- Dimensions: 988 × 300 × 278 mm; weight: 85 kg; IP65

Open Smart Energy Management

Compatible with intelligent scheduling, third-party EMS, and grid flexibility programs.
- RS485 / CAN communication interfaces
- Works with ZTTEK smart gateway for load management and energy scheduling
- Supports third-party EMS integration
- Suitable for VPP participation, demand-side flexibility, and smart building projects

Applications

Solar Self-Consumption

Store surplus PV generation and maximize on-site energy utilization.

Time-of-Use Optimization

Charge at off-peak rates and discharge during peak tariff windows.

Smart Building Integration

Connect to building EMS for automated energy management and reporting.

VPP & Grid Flexibility

Aggregate distributed storage for virtual power plant and demand response programs.

Datasheet

ZTTEK C&I Battery Storage Cabinet Datasheet