BOLT1 at Fred. Olsen Test Site Norway (2009 – 2011)

June 26th 2009 Fred. Olsen installed the point absorber system BOLT1 at our local test site off the coast of Risør, Norway. She was deployed for 21 months.
BOLT1 has electrical power take off, but an hydraulic accumulator system that workes as a spring to wind the drum back in. Though the hydraulics proved to be a reliable system, it taught us the complexity of a hybrid system in terms of offshore maintenance.

She was fitted with a regular rope winch, and the engineering team was able to verify the rope manufacurers prediction of about 400.000 cycles lifetime of the rope.

Following the BOLT1 test trials, it was decided to replace hydraulic pull back with electric and that a completely new high cycle winch design had to be developed.

Operational Key Performance Indicators 
Period installed on siteJun. 2009 – Oct. 2011
Time on site15.216 hrs
Production hours1.186 hrs
System uptime8%
Total produced electrical energy4 824 kWh
Total absorbed mechanical energy14 568 kWh
Overall efficiency (electrical/mechanical energy)33%
Average power over all production periods4.1 kW
Max average power over 20 min series5.8 kW
Longest recorded winch stroke 6 m

Accumulated produced electric energy over the installation period.

Distribution of energy produced over 20 minutes series:

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