E PROPULSION -
7 février 2023
Propulsion électrique et hybride
Merci à tous d’avoir donné votre avis sur les propulsions électriques et hybrides !
Chacune de vos contributions nous permet de travailler plus finement sur le catamaran de demain.
1# Quelle optimisation pour ma propulsion ?
En étudiant vos réponses, l’optimisation de l’usage électrique ressort comme l’architecture favorite (57% des voix), il semble que vous soyez prêts à perdre un peu en vitesse de croisière ‘hybride’ pour avoir plus d’autonomie en électrique.
Un autre retour très instructif est que l’architecture orientée ‘prix’ est la seconde lauréate de vos votes (28.6%). On observe que beaucoup d’entre vous sont prêts à faire de gros sacrifices sur les performances et l’autonomie, pour maintenir une offre à coût abordable.
2# Quelle est votre solution rêvée ?
Si l’on regarde les souhaits évoqués hors contraintes, dans la seconde partie du questionnaire, il ressort que la solution ‘idéale’ offrirait 2 à 3h d’autonomie électrique, 5 nœuds minimum de vitesse de croisière hybride illimité (groupe électrogène en fonctionnement), le tout dans un prix compris inférieur à 20% du prix de base du bateau.
Nous avons également bien noté vos alertes sur le poids du système, qui devient vite incompatible avec les performances voulues à la voile sur un Excess.
3# Quelle orientation pour la suite ?
Soyons réalistes et pragmatiques : Oui tout le monde est enthousiaste à l’idée d’un Excess 11 à propulsion hybride, mais aucune des architectures proposées ne semble répondre à vos attentes.
A la lecture des commentaires libres, le sentiment est que nous y sommes ‘presque’ mais que les pistes proposées ne trouvent pas encore un point d’équilibre convainquant entre performances, autonomie, prix et poids.
Hors de question bien sûr d’en rester là, nous retournons de ce pas à nos réflexions ! Il faut continuer à optimiser l’équation, mais aussi peut-être ouvrir d’autres pistes, être plus inventifs, sortir encore plus des sentiers battus… ?
En tout cas nous allons continuer à chercher !
Merci beaucoup !! Stay tuned !
4
comments
We are a family with some sailing and engineering background. Plan going blue water sailing on our own catamaran with friends in a few years 2025+. Therefore we chartered a N40O in Croatia two weeks ago and had a professional trainer on board to start our crew education.
During this time, we experienced all wind strengths, including storms with lightning strikes in the water some miles away. Thanks to good planning, we motored back to the marina in time and moored next to an excess 11 before the storm raged for 2 days.
We took the opportunity to visit the excess 11 and our neighbors checked our boat layout, both having dual helm stations at the stern. Now excess has mentally captivated us and we have already chartered an excess 14 for next April, which will be in operation 2024.We will also meet our marina neighbors at Boot Düsseldorf in January 2024 and eagerly visit the new excess 1x.
After this long introduction, I would like to share two conclusions I gained this year with you:
1) Manufacturer approved Motor integrated alternators Systems; We will definitely choose a catamaran with powerful redundant diesel engines and not simple electric motors powered by generators. The ecological improvement will be the optimized generation of electricity from the diesel engines. Having the electric motor hybrid into the powertrain integrated.
Those are currently being developed by several Shipyards suppliers. For example by Integrelsolutions.com, where the alternator E motor is between the motor and the drive installed. Which makes the Engine 100mm or 150mm longer and therefore only could be factory installed by excess.
2) 48VDC will be the new standard for mass electrical energy storge. Provide 48VDC bulk units over-voltage and over-current fused with oversized high quality rated cables. And no serial coupling of 12VDC or 24VDC small batteries with small cable cross-sections. Each of which will be a source of Fire ignition in the event of wear and tear. The two storage systems must be spatially and functionally separated into the two floats.
February this year a lightning hit our house and destroyed parts of our 15kWp Photovoltaic installation. One String of 1000VDC approved cabling an MC4 connectors got an isolation resistant failure to ground and had to be replaced completely. Our 10kWp PV Hybrid battery Inverter AC load relays got destroyed. Thanks to Surge Protection in 230VAC landline no fire erupted. Our two 10kWh parallel wired batteries 48VDC protected bulk units switched off into safety mode and have not been damaged. 48 Volts DC is a safe voltage with reasonable current. that trained persons are allowed to apply.
thank you for taking note of it Felix
Dear Forum, in case you want to better understand E-Drive solution here the link to the technical specification
https://integrelsolutions.com/wp-content/uploads/2023/09/E-DRIVE.pdf
We are looking for a manufacturer who can offer a mature and tested hybrid solution. For our blue water trip in 2026+
Thank you for your interest in Excess and your well-thought-out suggestions.
I notice that you have a good insight into propulsion and on-board power issues, and you have reached more or less the same conclusions as our in-house engineers.
Additional alternators, or ideally parallel hybrids to generate energy while sailing, are indeed an excellent alternative for blue water cruising on a catamaran.
And I also fully agree with your conclusions regarding the 48V. This voltage provides a good balance of efficiency, cable section, and safety. It has the potential to become the standard voltage for boating in the future, hopefully.…
Now, although some solutions are starting to rise on the market, the costs are still very high, and some engine manufacturers are hesitant to overcharge their engines with powerful alternators or fancy systems.
We at Excess are actively pushing towards these new solutions and innovations. Our belief is that on-board power should be approached holistically, with harbour propulsion being only one component…
We won't propose anything to the market until we are 100% confident in it, both technically and commercially, but we are optimistic that we will soon find the optimal balance between features and cost.
Thanks again for your feedback and comprehensive look at this topic.
Stay tuned !
Hervé
A year on, how close are you to proposing a solution to the market?
Thanks,
Neil