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The Glass CHP · Battery storage

Pre-charge circuit (Precharge)

Ventilation/dehumidification — the silent 24/7 load, with heat recovery. Part of the glass family — like our glass BESS, biogas plant and CHP.

Pre-charge circuit (Precharge)
Outdoor air → Fresh air → Heat recovery → Heating coil → Hall → Exhaust
Glass-box in 4 steps

Understand → See it live → What the AI does → Your benefit

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Your benefit

What is the pre-charge circuit (Precharge)?

> The pre-charge circuit (Precharge Circuit) is an essential protection component in battery energy storage systems (BESS), which controls the voltage build-up at the power electronics components. It prevents high inductive voltage spikes (Inrush Currents), which could destroy power semiconductors, by limiting the switching current. According to IEC 62477, it is critical for the integrity of the DC intermediate circuit connection and the lifespan of the components.

No own register — honestly

For this component, no dedicated register is assigned; therefore, no example value is provided here. Where the system measures, the value is read as read-only and calculated internally. It is visible via connected components.

What the AI reads in this component

What the AI reads
  • Voltage difference across the pre-charge resistor as an indicator of full capacitor charging
  • Current flow through the pre-charge switch for insulation fault detection
  • Duration of the charging process to monitor capacitor capacity
  • Status of the pre-charge relay as confirmation of power electronics availability
Scenario

Monitored: continuous

The scenario: > Monitored: continuously · every cell, every rack The scenario: a weak cell silently limits capacity, lower yield per cycle, no alarm. The AI: tracks outliers over cycles and reports them before they slow down the string. It identifies the trend before the limit value is triggered.

Why it is important

Prevention of component damage due to overvoltages ensures plant availability and reduces OPEX. Monitoring the pre-charge circuit enables early detection of ageing processes in the DC capacitors. This prevents costly failures of the power electronics and stabilises the profitability of the BESS. usable capacity (kWh) · SoC (%) · Reserve (%) → — kWh available Calculation: Capacity × (SoC − Reserve) ÷ 100

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Standards & norms

What the rules require — Pre-charge circuit (Precharge)

Grounded in the applicable national standards for battery energy storage systems. Same knowledge base as the European reference plant; presented anonymously.

Basis: the applicable national standards. Values shown are those measured on the plant, not target figures.