Pumpwarden Starter PW-S1

Specifications. Pre-production design, last updated 26 October 2026. Details may change before release.

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Overview

Function	Starts, stops and monitors a diesel fire pump locally and from a phone
Controller	Single board, 128 x 90 mm, 4-layer
Enclosure	Sealed polycarbonate box with clear lid, 160 x 160 x 60.5 mm. Enclosure rated IP68 as supplied; IP67 as installed with the cable glands and pressure-equalising vent
Local operation	Works from its own start button, emergency stop and remote contact without any internet connection
Optional display	Small I2C display (Qwiic connector, two ports)

Power

Supply	12 V battery system (the pump's starter battery)
Protection	Reverse polarity protection, surge suppression (36 V TVS diode), 5 A replaceable supply fuse
Backup battery	1-cell lithium (LiPo) pack on a JST PH connector, charged from the supply. Keeps the controller reporting for long enough to send an alert if the pump battery fails
Service power	USB-C for bench power, charging and setup
Battery monitoring	Measures battery voltage. Warning level adjustable 9 to 14 V, trip level adjustable 8 to 13 V

Outputs

Fuel solenoid	Switched battery positive (high side), with a flyback diode for the coil
Starter motor	Switched battery positive (high side), with a flyback diode
Status output	Optional "running" output
Start sequence	Fuel on, crank, confirm oil pressure, retry if the engine does not catch. Crank time adjustable 0.5 to 6 seconds. Start attempts adjustable 1 to 5
Output current ratings	Published with the installation guide before sale

Inputs

Emergency stop	Normally closed contact. Open circuit, broken wire or an unplugged connector counts as a stop (fail-safe)
Local start	Normally open pushbutton
Remote start	Dry contact, opto-isolated
Oil pressure	Pressure switch, opto-isolated
Water level switch	Float or level switch, opto-isolated
Fuel level switch	Float or level switch, opto-isolated
Water level sensor	Loop-powered 4 to 20 mA transmitter, supplied from the battery rail. Detects a wire break or fault below 3.5 mA and above 21 mA. Warning and stop levels adjustable
Fuel sender	Resistive fuel sender input. Warning level adjustable
Optional sensors	The water level sensor and the fuel sender can each be switched off in settings if not fitted

Connections

Terminals	Pluggable screw terminals with angled-exit plugs. The analog loops and the dry-contact inputs use different pitches, so a plug cannot be put in the wrong socket
Local controls	Keyed 3-way header for the emergency stop and start pushbutton
Other	USB-C, two Qwiic ports, backup battery connector
Front-panel lights	Power, ready, cranking, oil pressure, water level OK, emergency stop fault, battery charge, and a status LED

Connectivity

Network	Cellular (LTE Cat 1) through a plug-in regional module. One controller design for Australia and New Zealand, Europe and the Americas
SIM	Built in and multi-carrier. Nothing to buy, activate or top up. The connection is covered by the yearly plan
Reporting	Sends a status update whenever something changes, plus an hourly heartbeat
Updates	Software is updated over the air

App and alerts

App	Web app that works in any modern phone browser and can be added to the home screen. No app store
Control	Hold-to-start and tap-to-stop, with a record of who did what and when
Notifications	Phone notifications when the pump runs or stops, a fault trips or a start fails, water, fuel or battery run low, and when the pump goes offline or comes back
Offline watch	A separate watchdog alerts you after about two and a half hours without a report
Sharing	Owner, operator (start and stop) and viewer (look only) roles
History	90 days of events, viewable by day with filters
Location	A pin you place. Viewers see an area about two kilometres across
Data	Stored in Sydney, Australia. See the privacy policy

Approvals and status

Status	Pre-production. Not yet on sale
Approvals	The finished controller has not yet been tested or approved. We will publish test results and approvals for each region before it is sold there
Operating temperature	-20 to +60 °C inside the enclosure. This is the design range from the component ratings, to be confirmed by testing. Mount out of direct sun: a clear lid in full sun runs hotter than the air around it

Questions about a particular pump or installation? Get in touch.