Six Models. Every Engine Size. One Solution.
From single-engine work boats to multi-engine tug and tow operations, there’s a BoatStartPlus™ built for your vessel. Our proprietary supercapacitor technology installs permanently alongside your existing battery and delivers instant, reliable starting power — on engines from under 7 liters all the way up to 32 liters. One installation. Zero maintenance. A vessel that starts every time — because downtime isn’t an option.
BoatStartPlus™
SKU: MKSM2012
The Original. Perfect for smaller outboards and single-engine boats.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | SPECS | VALUE |
|---|---|---|---|---|---|---|
| 2 | Voltage | 12V | ||||
| 3 | Cells | 20-cell | ||||
| 4 | Capacitance | 240F | ||||
| 5 | Max Power | 42.05 kW | ||||
| 6 | Engine Size | Up to 7L | ||||
| 7 | Internal Resistance | |||||
| 8 | Energy Stored | |||||
| 9 | Dimensions | 14.25" x 10.25" x 6.25" | ||||
| 10 | Weight | 8 lbs | ||||
| 11 | Operating Temp | -40°F to 149°F | ||||
| 12 | Warranty | 3 yr module / 1 yr components | ||||
| 13 | Price List |
The original BoatStartPlus™ is the dependable starting solution for single-engine work boats and light commercial vessels with engines up to 7 liters. Compact, low-maintenance, and built to perform shift after shift.
BoatStartPlus™ XL
SKU: MKSM612
More capacity for bigger single-engine vessels.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | SPECS | VALUE |
|---|---|---|---|---|---|---|
| 2 | Voltage | 12V | ||||
| 3 | Cells | 6-cell | ||||
| 4 | Capacitance | 525F | ||||
| 5 | Max Power | 47 kW | ||||
| 6 | Engine Size | Up to 8L | ||||
| 7 | Internal Resistance | 0.0011 ohms | ||||
| 8 | Energy Stored | 42.3 kJ | ||||
| 9 | Dimensions | 14.79" x 7.75" x 8" | ||||
| 10 | Weight | 22 lbs | ||||
| 11 | Operating Temp | -40°F to 149°F | ||||
| 12 | Warranty | 3 yr module / 1 yr components | ||||
| 13 | List Price | $2,899.98 |
When your operation needs more capacity, the XL delivers. With 525 farads and 47 kW of starting power, it handles engines up to 8 liters reliably — keeping your vessel on schedule even when your battery can’t.
BoatStartPlus™ Boost
SKU: MKSM1012
Built for twin-engine vessels and larger offshore boats.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | SPECS | VALUE |
|---|---|---|---|---|---|---|
| 2 | Voltage | 12V | ||||
| 3 | Cells | 10-cell | ||||
| 4 | Capacitance | 1,260F | ||||
| 5 | Max Power | 112 kW | ||||
| 6 | Engine Size | Up to 15L | ||||
| 7 | Internal Resistance | 0.0008 ohms | ||||
| 8 | Energy Stored | 101.6 kJ | ||||
| 9 | Dimensions | 19.44" x 7.75" x 8" | ||||
| 10 | Weight | 32 lbs | ||||
| 11 | Operating Temp | -40°F to 149°F | ||||
| 12 | Warranty | 3 yr module / 1 yr components | ||||
| 13 | List Price | $3,866.64 |
The go-to choice for twin-engine commercial vessels and working offshore boats. With 1,260 farads and 112 kW of starting power, the Boost handles demanding engine configurations up to 15 liters — and keeps your operation moving when it matters most.
BoatStartPlus™ Turbo
SKU: MKSM1212
Maximum 12V power for the most demanding twin-engine setups.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | SPECS | VALUE |
|---|---|---|---|---|---|---|
| 2 | Voltage | 12V | ||||
| 3 | Cells | 12-cell | ||||
| 4 | Capacitance | |||||
| 5 | Max Power | |||||
| 6 | Engine Size | Up to 15L | ||||
| 7 | Internal Resistance | |||||
| 8 | Energy Stored | |||||
| 9 | Dimensions | |||||
| 10 | Weight | |||||
| 11 | Operating Temp | -40°F to 149°F | ||||
| 12 | Warranty | 3 yr module / 1 yr components | ||||
| 13 | List Price | $4,115.80 |
When your 12V twin-engine operation demands maximum starting reliability, the Turbo delivers. Engineered for commercial vessels where a no-start means lost revenue, delayed schedules, and stranded crews.
BoatStartPlus™ Ultra
SKU: MKSM1024
The 24V solution for larger vessels and serious offshore powerboats.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | SPECS | VALUE |
|---|---|---|---|---|---|---|
| 2 | Voltage | 24V | ||||
| 3 | Cells | 10-cell | ||||
| 4 | Capacitance | 315F | ||||
| 5 | Max Power | 112 kW | ||||
| 6 | Engine Size | Up to 32L | ||||
| 7 | Internal Resistance | 0.0019 ohms | ||||
| 8 | Energy Stored | 112.4 kJ | ||||
| 9 | Dimensions | 19.44" x 7.75" x 8" | ||||
| 10 | Weight | 32.5 lbs | ||||
| 11 | Operating Temp | -40°F to 149°F | ||||
| 12 | Warranty | 3 yr module / 1 yr components | ||||
| 13 | List Price | $3,866.64 |
Running a 24V system on a larger commercial or offshore vessel? The Ultra handles engines up to 32 liters and delivers 112 kW of starting power — so your operation stays on the water and on schedule, regardless of battery condition.
BoatStartPlus™ Max
SKU: MKSM1224
The ultimate BoatStartPlus™ for the largest, most demanding vessels.
| wdt_ID | wdt_created_by | wdt_created_at | wdt_last_edited_by | wdt_last_edited_at | SPECS | VALUE |
|---|---|---|---|---|---|---|
| 2 | Voltage | 24V | ||||
| 3 | Cells | 12-cell | ||||
| 4 | Capacitance | 263F | ||||
| 5 | Max Power | 94 kW | ||||
| 6 | Engine Size | Up to 32L | ||||
| 7 | Internal Resistance | 0.0022 ohms | ||||
| 8 | Energy Stored | 102 kJ | ||||
| 9 | Dimensions | 19.44" x 7.75" x 8" | ||||
| 10 | Weight | 34.5 lbs | ||||
| 11 | Operating Temp | -40°F to 149°F | ||||
| 12 | Warranty | 3 yr module / 1 yr components | ||||
| 13 | List Price | $4,115.80 |
The MAX is built for the most demanding 24V commercial marine applications. From heavy tow boats to large multi-engine workhorses, it provides 94 kW of reliable starting power for engines up to 32 liters. When a no-start costs you time, revenue, and reputation — the MAX keeps you running.
Compare All Six Models
Match your vessel’s engine size and electrical system to the right BoatStartPlus™ model.
| KSM Kompact® | KSM612 | KSM1012 | KSM1212 | KSM1024 | KSM1224 | |
| SKU | KSM2012 | KSM612 | KSM1012 | KSM1212 | KSM1024 | KSM1224 |
| Voltage | 12V | 12V | 12V | 12V | 24V | 24V |
| Cells | 20 | 6 | 10 | 12 | 10 | 12 |
| Capacitance | 240F | 525F | 1,260F | 315F | 315F | |
| Max Power | 42.05 kW | 47 kW | 112 kW | 112 kW | 94 kW | |
| Engine Size | Up to 7L | Up to 8L | Up to 8L | Up to 15L | Up to 23L | Up to 23L |
| Weight | 8 lbs | 22 lbs | 32 lbs | 32.5 lbs | 34.5 lbs | |
| Start Cycles | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 |
| Price | $2,899.98 | $3,866.64 | $4,115.80 | $3,866.64 | $4,115.80 |
Need help specifying the right model for your fleet?
Call (800)527-8278, and we’ll work with your commercial operators to find the right fit.
What Boat Owners Are Saying
“The value the KSM has provided is me knowing that my boat will start every time. It’s peace of mind when I’m 30-40 miles offshore. I don’t want my starting bank to drain and be stuck out there. Knowing that capacitor is holding the charge and can start the motor is what sold me.”
– Captain Mike Littlefield, Archangel Fishing Charters
Engineering You Can Count On
Instant Power
Maximum cranking amps released in milliseconds—no chemical delay
30-Second Recharge
Fully recharged in 30 seconds from any 12V source
All Temps
Full power from -40°F to 149°F with zero degradation
No Charging
Supercapacitor technology—never needs charging, no batteries to replace
Waterproof
IP67 rated components stand up to saltwater, extreme weather, and combat conditions
Made in USA
Designed and manufactured in Lake in the Hills, Illinois
Your Vessel Needs to Start. Every Shift. Every Time.
A stranded vessel costs you time, revenue, and customer trust. BoatStartPlus™ installs once and delivers reliable starting power for the life of your vessel — no matter what your battery says.
Working with a fleet? Call (800)527-8278 for volume pricing and fleet specifications.