Mixed — see below

DC plant controllers and monitoring units

A dead controller takes a whole plant out of supervision even when every rectifier is still working perfectly. It is the single most disruptive failure in a DC plant and, because controllers are firmware-tied and generation-specific, the hardest thing to substitute blind.

How it sits in the shelf

The part number is printed on the module front. That number, or a phone photo of it, is all we need to start.

Illustrative schematic drawn by VOLT48 — not to scale, and not a manufacturer drawing.

Availability & lifecycle

Mixed and highly generation-dependent. Controllers are the family where a like-for-like match matters most, and where guessing from a model name alone goes wrong most often.

Models we are asked for

Part number	Model	Indicative specification
—	Eltek Smartpack / Smartpack2	Controllers for Flatpack and Flatpack2 DC systems
—	Vertiv NetSure controllers	Supervision units for NetSure 501/701 platforms
—	Multi-brand monitoring units	Huawei, Delta, ZTE and Eaton plant supervision modules

Specifications are indicative and published by the manufacturer. Availability, exact revision and lead time are confirmed in the written quotation.

Where it is used

Any 48V DC plant that has lost supervision
Battery management and low-voltage disconnect control
Remote alarm and SNMP monitoring
Plant commissioning and reconfiguration

Close-up of relays and terminal blocks on a monitoring panel — Site photography. Illustrative of the environment — not of a specific model.

What to send us

A photo of the controller front panel and its label, the plant model, and — if you can still read it — the firmware version. Also tell us what the plant is doing now: running unsupervised, or fully down.

Not sure what the number on your label is? Look it up in the part number index →

Compatibility notes

A controller swap normally means reloading site-specific settings: float and boost voltages, battery capacity, LVD thresholds and alarm mapping. Budget for that configuration step, not just the hardware.

Common questions about this family

My plant lost supervision but the rectifiers still work — how urgent is it?

More urgent than it feels. Without the controller you lose battery management, low-voltage disconnect control and alarms, so the first sign of a real problem may be a site that is already down. The rectifiers keep working right up until something needs the protection that is no longer there.

Can I swap a Smartpack for a Smartpack2?

Controllers are the family where generation matters most and where guessing from a model name goes wrong most often. Beyond the hardware, a controller swap means reloading site-specific settings — float and boost voltages, battery capacity, LVD thresholds and alarm mapping — so budget for that configuration step, not just the part.