Check out the SS Harmony, a diesel-electric cat at www.myfindingharmony.com
The original beta Solomon system cost the owner over $30k, and ended up being replaced with an off the shelf Grainger system. A lot of work went into that boat. A LOT.
The owner lives next door. We spoke about the battery. His conclusion was the 144v bank was tedious to maintain for the slight benefit of charging efficiency.
In addition, he concluded the bank held too little energy for useful traction drive. The boat was simply too big to make a battery bank practical. The current system is a series hybrid. There are no batteries for traction drive. He runs both gennys for maneuvering power, but can bump sailing speed by running just one. His former traction bank is now the house bank, running an inverter for silent 120vac.
A 39ft cat is shorter than the Harmony, but still quite large. I just installed two 5kw motors (48v) in a Lagoon 42, with only tepid results. The boat will still make 3.5 knots into a 20mph headwind, however, and the owner is pleased. The 2x100aH battery strings are flat in 45minutes at that rate. The owner (a former Tesla engineer) has chosen to use his motors for harbor maneuvering only. I'm currently working on a 48v diesel generator for his boat for passage making. Diesel fuel holds a huge amount of energy compared to lead-acid. Take a look at the Queen Mary II for a look at a similar type of system.
Be Well,
Arby Bernt
Advanced Marine electric Propulsion
From: Kirk <kirkmcloren@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Mon, July 5, 2010 6:35:14 AM
Subject: [Electric Boats] Re: Anyone have experience with 144 volt motor systems?
The original beta Solomon system cost the owner over $30k, and ended up being replaced with an off the shelf Grainger system. A lot of work went into that boat. A LOT.
The owner lives next door. We spoke about the battery. His conclusion was the 144v bank was tedious to maintain for the slight benefit of charging efficiency.
In addition, he concluded the bank held too little energy for useful traction drive. The boat was simply too big to make a battery bank practical. The current system is a series hybrid. There are no batteries for traction drive. He runs both gennys for maneuvering power, but can bump sailing speed by running just one. His former traction bank is now the house bank, running an inverter for silent 120vac.
A 39ft cat is shorter than the Harmony, but still quite large. I just installed two 5kw motors (48v) in a Lagoon 42, with only tepid results. The boat will still make 3.5 knots into a 20mph headwind, however, and the owner is pleased. The 2x100aH battery strings are flat in 45minutes at that rate. The owner (a former Tesla engineer) has chosen to use his motors for harbor maneuvering only. I'm currently working on a 48v diesel generator for his boat for passage making. Diesel fuel holds a huge amount of energy compared to lead-acid. Take a look at the Queen Mary II for a look at a similar type of system.
Be Well,
Arby Bernt
Advanced Marine electric Propulsion
From: Kirk <kirkmcloren@
To: electricboats@
Sent: Mon, July 5, 2010 6:35:14 AM
Subject: [Electric Boats] Re: Anyone have experience with 144 volt motor systems?
--- In electricboats@
>
> I'm trying to decide between 48 volt and 144 volt motor systems for a newly constructed 36 foot catamaran. I'm hoping that there are some people here that have some firsthand experience with the 144 volt systems.
>
lots easier to electrocute yourself with higher voltage
accidents do happen
Kirk
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