A packaged drive from Oceanvolt, Torqeedo or ePropulsion includes its controller. If you're building your own drive around a separate motor, the controller is the part you have to size yourself — and its continuous current rating, not the headline peak, is what matters for a boat.
Both makers publish current ratings for limited periods. The checker compares them with the continuous phase current the configurator calculates for your power and voltage.
Don't know your figures? Size your boat in the configurator — it works out power, voltage, pack size and phase current from your hull and target speed.
Kelly Controls KLS-N, 36–48 V models | Kelly Controls KLS-N, 48–72 V models | Sevcon (BorgWarner) Gen4 Size 4 / Size 6, 36–48 V | Sevcon (BorgWarner) Gen4 Size 4, 96–120 V | |
|---|---|---|---|---|
| Nominal voltage (operating range) | 36–48 V (27–60 V) | 48–72 V (36–86 V) | 36–48 V (19.3–69.6 V) | 96–120 V (48–150 V) |
| Peak current | 140–700 A (1–2 min) | 140–700 A (1–2 min) | 450 / 650 A phase (2 min) | 300 A phase (2 min) |
| Continuous current | 60–420 A, depending on model and heat sinking | 50–420 A, depending on model and heat sinking | 180 / 260 A phase (60 min) | 120 A phase (60 min) |
| Motor types | Brushless PM with hall sensors (sinusoidal) | Brushless PM with hall sensors (sinusoidal) | PMSM (incl. BLDC) and AC induction | PMSM (incl. BLDC) and AC induction |
| Protection | IP66 | IP66 | IP66 | IP66 |
| Communication | Broadcast CAN, 250 kbps | Broadcast CAN, 250 kbps | CANopen | CANopen |
Scroll sideways on a phone. “Not stated” means the manufacturer's page doesn't give the figure.
Wide range of models, IP66, regen by default.
60-minute phase ratings, induction and PM motors, CANopen.
The only controller here rated for a 96 V bus.
Budget DIY builds at 48 V, from small launches up to the larger NC models.
The higher continuous figures depend on extra heat sinking — design the cooling, don't assume the top of the range.
48 V builds that want headroom above the battery's charge voltage.
Not rated for a 96 V bus (86 V maximum operating voltage).
48 V builds that want an automotive-grade, highly configurable controller with clear 60-minute ratings.
Configuration needs Sevcon's tools and some experience; budget for setup time.
96 V DIY builds at modest power.
120 A continuous limits it to lower-power 96 V drives — check your phase current.
Questions
Figures checked on 22 October 2026 against these manufacturer documents. Makers change specifications; confirm against the current datasheet before you buy.
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