CycleWatt

Keep the complete pack. Add the intelligence to reuse it.

Whole Pack Utilization preserves the automotive system already engineered into a retired EV battery and connects it to CycleWatt diagnostics, redundant control and site-level energy management.

See how it worksExplore E-Stack®
Complete retired EV battery pack

Solution · Whole Pack Utilization

From retired battery to deployable storage.

The pack remains intact throughout qualification and integration. CycleWatt adds the interfaces, controls and energy-management layer required for stationary operation.

CycleWatt Drop, Test, Plug and Play whole-pack process
01

Drop

An authorized partner removes the retired pack and keeps the complete automotive system intact.

02

Test

BMS data, insulation, safety status and usable battery condition are screened before qualification.

03

Plug

The qualified pack connects to E-Stack® through CycleWatt interfaces and independent controls.

04

Play

Power conversion and EMS coordinate storage with the grid, site loads, charging and renewables.

Layered safety architecture

Preserve OEM protection. Add system-level supervision.

The original pack protection remains active while CycleWatt adds deterministic controls, cabinet monitoring, power conversion and energy management.

Layer 1 - Complete packMechanical enclosure, thermal architecture and pack-level integrity.
Layer 2 - Original BMSVoltage, temperature, current and embedded protection logic.
Layer 3 - CycleWatt controlsDual-redundant controllers, state management and system interlocks.
Layer 4 - Complete BESSPCS, EMS, HVAC, cabinet sensors, alarms and remote monitoring.
CycleWatt E-Stack® outdoor second-life battery energy storage system

Current product

E-Stack®

An all-in-one outdoor second-life hybrid Battery Energy Storage System.

1
Tier-1 battery foundation

Complete automotive packs and the original BMS are retained.

2
Dual in-house controllers

Redundant CycleWatt control with VCU-inspired system logic.

3
Hybrid PV-ESS architecture

Grid, photovoltaic, charging and site loads can be coordinated.

4
Rigorous validation

MIL, PIL and HIL environments support functional and safety testing.

5
Modular and plug-and-play

Pack bays and system interfaces support maintainable deployment.

6
Remote monitoring

Local HMI plus optional remote EMS and supervision.

E-Stack® reference configuration

Detailed product specifications.

Actual energy and power depend on pack qualification, selected configuration and project design.

AC output40 kW reference · three-phase configurations including 400 V
Storage energy130 kWh reference using four complete NMC EV packs
PV integrationOptional input up to 60 kWp with multiple MPPT channels
Control and communicationLocal HMI, CAN, Modbus RTU/TCP, optional 4G and Wi-Fi remote access
Cabinet protectionIP55, HVAC, temperature and smoke sensing, water-leak detection and fire suppression
Operating envelope-20 °C to 45 °C reference · up to 2,000 m · up to 95% RH non-condensing
Physical dataApprox. 1460 × 2100 × 2000 mm · less than 1.8 t reference
MonitoringSite HMI and optional remote monitoring from PC or mobile device

Product roadmap

One platform, more products to come.

Diagnostic and discharge tools extend the whole-pack platform before and after stationary deployment.

PackRead

Rapid offline access to BMS data for first-line screening and traceability.

In development

PackCheck

Mobile real-capacity and condition testing for pack qualification.

In development

PackDis

Controlled discharge and transport preparation supporting the final recycling route.

In development

Business model · Two ways to work with CycleWatt

Choose the route that matches your battery or energy need.

1

Turnkey Second-Life Solution Provider

  • The customer provides retired battery packs.
  • CycleWatt tests, qualifies and integrates eligible packs into second-life BESS.
  • Development-free, pay-as-you-go delivery can extend beyond the BESS itself.
Project-based quotation depending on pack quantity and service scope.

Target customers

RecyclersOEMsCar dismantlersFleetsMarketplaces
2

BESS Integration Supplier

  • CycleWatt sources qualified retired packs.
  • CycleWatt delivers a complete second-life BESS solution.
  • Deployment is completed with installation and EPC partners.
Project-based quotation depending on system size and site requirements.

Target customers

Charging stationsC&ISolar farmsWind farms

Bring us retired packs or a site energy constraint.

We will identify the correct qualification, product and project route.