A popular use case for gensets is back-up power, which means that they need to start reliably and come online quickly when the need for power arises. Most often gensets are started with lead-acid batteries - a technology not known for its reliability. Skeleton Technologies' SkelStart Engine Start Module provides a solution: reliable, high-power solution for engine starting, guaranteed to crank the genset even in challenging conditions.

In a typical set up as you see below, the starting power is provided by lead-acid batteries.

Genset starting 1

In our solution, the batteries are replaced with SkelStart Engine Start Module, ensuring reliable starts as well as a number of other advantages:

  • No battery-based start failures anymore
  • 10 – 20% less cranking time
  • -40°C to +65°C operating temperature range
  • 100% reliable energy storage with zero maintenance
  • Over 1 million cycles & longer calendar life: 15 to 20 years
  • Ultracapacitors do not leak or contain acid or lead
  • Considerably lighter than batteries for high power applications
  • SkelStart can be charged by a dedicated power supply or using a solar panels

Genset starting 2

In one customer case, we replaced 12 lead-acid batteries with just two SkelStart, resulting in a number of benefits. The customer had used 12V batteries to start a KTA50-G3 diesel genset and had to do maintenance checks monthly. SkelStarts doubled the lifetime of the starting system, and reduced maintenance needs significantly.


The benefits are clear:

  • 6x less volume
  • 16x less weight
  • >2x longer lifetime
  • Only yearly maintenance checks


In terms of Total Cost of Ownership, the battery-based solution is 5.5 times more expensive than SkelStart when we look at a long-term timescale.