Suitable for cranes, backhoes, bulldozers, and off-road trucks, ultracapacitor-based 24 V Engine Start Module takes over engine cranking and starting function by remaining fully charged, even if battery voltage drops significantly. ULTRA 31/900/24V and ULTRA 31/1100/24V are available for starting diesel engines up to 12.5 L and 15.0 L, respectively. Performing normally over broad temperature range of -40 to +149°F, ultracapacitors operate in up to 1 million or more charge/discharge cycles.