He said the long sail north was a major detour in his bid to win the Vendee Globe 2012 round the world yacht race.
The non-stop race, known as the "Everest of the Seas", begins in Les Sables d'Olonne, France, and heads east via the capes of Good Hope, Leeuwin and Horn before heading back to the finish in Les Sables d'Olonne.
Mr Stamm said he was leading the race until one of the brackets holding the hydro-generator onto the hull failed.
The system uses moving water to generate electricity, and without it, he does not have enough energy to power appliances such as lights, pumps, computers, navigation and automatic piloting equipment.
Mr Stamm said he was being careful not to come into physical contact with any other vessels for fear of breaking race rules, which state competitors will be disqualified if they receive help or equipment from anyone during the race.
While in the Auckland Islands, a Russian ship came alongside and offered fuel, but he rejected the offer because he was determined to continue the race.
He said it was a difficult choice, but he was guided by his "sense of responsibility".
Mr Stamm said he had been at sea since November 10, and at an average speed of 14 knots, he still had about 40 days to go before he crossed the finish line.
When asked if he had had a shower since his departure, he shook his head and pointed to the sea before making scrubbing motions.
He often dreamed of having a cold beer, he said.
"A beer would be nice now, but it would taste better at the end."
Being at sea alone was lonely at times, but he was grateful he could communicate on his laptop with his wife and two children.
However, the damaged hydro generator meant he has had to cut back on communication with his family.
He was looking forward to finishing the repairs so he could make contact again.
He hoped to be back on the high seas sometime today, he said.
Although Mr Stamm is only about halfway through the race, he said he was now more than 3500km behind the race leader now and it was unlikely he could still win.
In his previous attempt at the Vendee Globe race, he had to retire due to damage, so this year's race was now more about finishing, he said.