There is a little confusion about "Onboard start" on the Wrens, because "Onboard start" is short for Manual start with onboard starter (as opposed to Manual start with wand starter). It's a Manual start system rather than an Autostart, and means that you - rather than the ECU - do the start, switching on the glow and the propane etc. Once the start has been done, the ECU takes over. The advantage is that this system is smaller, lighter, cheaper and you don't need a starter battery or propane onboard.

Sara Parish
Wren Turbines