Monday, August 19, 2024

Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

are you mating the ME1616s to the saildrives and keeping the transmission for FWD REV etc or going straight to the drive leg?
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Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

Ahhh make much more sense when i thnk about it like 240 and 120VAC. L1 L2 and N. then a case ground for 48vdc breakers etc?
 
THANK YOU!
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Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

I installed one, but my boat is still on the hard, so I don't know how it will perform yet I bought a kit from thunderstruct_ev. They configured it for 96v. I bench tested it before putting in my boat and it ran as expected. My sailboat is 45', 13 tons. I plan to use 32 EVE prismatic cells @280 amp hours.

On Tue, Aug 13, 2024, 8:56 AM Charlie via groups.io <cp3sail=gmail.com@groups.io> wrote:
Anyone with ME1616 experience?
 
I am planning to run one at 48VDC, what is the actual kW available? 
 
I tend to believe only the most conservative numbers, so I saw a post in EV Europe listing it as 6kW continuous when run at 48V with 2000rpm listed. (assuming it cant go faster than 2000 rpm at 48VDC?)
 
Here is the verbage:
  • Power max 50kW@96V
  • Power continuous 6kW@48VDC – 2000rpm – 12 kW@96VDC – 4000rpm
 
 
I would love to go to 96VDC but I do not think that is wise for all of the accessory systems on the boat and since i always find a way to arc something despite precautions.
 
Any other 48vdc recommendations?  Thank you!!

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Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

Just a FB page for now: https://www.facebook.com/MVMaritima
 
Bipolar DC power is common in many devices that have audio power amplifiers. The important specifics is that the components that attach are all isolated. That is, no assumption that the negative is going to be the ground connection. Electrically, it's the DC equivalent of the 240VAC Split Phase system we use in the US where we have 2 hots and a neutral that's created by a center-tapped transformer. 
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Sunday, August 18, 2024

Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

Wow, Randy do you have a blog on this build?
 
Sounds like its going to move with authority!
 
I read up a bit but the internet quickly divulges into naysayers on the hot rail tapping threads. I would be very interested in understanding how this wiring works! Thanks!
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Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

ok so Dan I gave your Electric over hydraulic idea more thought and it could be a really good way to tip toe into going electric on this boat.  I like the small steps. I have been the 6month haulout guy before. I have been the 5yr refit guy. Once the sawzalls come out and the tent goes up the boat doesn't see the light of day for many moons. ;)
 
I also posted this over in DIY electric car as a read a few hydraulic conversion threads there with folks using skid steers and tractors to go electric.
 
Here is how i see it working:
 
Aux propulsion setup. Catamaran, 56ft long 26,000lbs, 2.5'draft
It is already hydraulic. 
It has one 85hp engine, coupled to two hydraulic pumps(valved for FWD and REV), hosed to 2 gearmotors, bolted to saildrive propeller units.


I would like to start small, as in just enough power and $$ to get the boat on and off of a dock in a clean smokeless fashion. I can run the diesel and its pumps when offshore for now.


The current setup uses Parker/Denison gear motors bolted to the saildrive propeller units. (photo below) They move 28mL per revolution.(1.7cubic inches) 


I thought that the simplest way to add an electric motor would be to do so at the engine, but alas the engine is directly coupled to the hydraulic pumps. I would need to decouple and put that on a clutch. Or remove the engine completely. If i remove the engine completely i need a big electric motor to run Two hydraulic pumps, so then i would rather just put smaller electric motors right at the final drives anyways. This is the end goal in a year or so. Just electric motors at the final drives. But for the short term i would like to get comfortable with electric drives, larger battery banks, larger solar etc before going purely electric. 
- So i bailed on that and decided to try to add small electric motors closer to the final hydraulic motors. 


- The props get the boat moving well at 600-1000rpms, and there is a bit of reduction in the saildrives. So I figured that I would need to get these existing gearmotors to spin at about 800-1200rpms to get the boat to move. So thats around 10gpm max i would need from an auxiliary pump to do it. (At 1000rpm the existing gearmotors are spinning 28,000mL thats 7.3Gallons.) 


So i have repaired excavator hydraulics and saw mill hydraulics, but am not very familiar with the tech as a whole.
- Can i just add a hydraulic pump Tee'd into the system as planned? If i add a tee, I will add a check valve, and then i need to decide where to pickup fluid from. Can I pull fluid through the whole system (cooler, old pumps, etc) via what is normally the fluid output line?-By teeing in upstream of the new checkvalve? (please see terrible sketch #1 alas i see no way to run this in REVERSE)
- Otherwise I can isolate the new system with solenoids (ref: terrible sketch #2)


So if that above does work, then I just need a motor to spin it. I currently use 2000rpm on the diesel to run the whole kit at crusing speed. Thats 40kW, so 20kW per hull. I don't need to match that, Half of that or less is good for these auxillary units. So 10kW per hull. 


So i found the ME0708 and all of its siblings. 48VDC & that seems to be ideal especially if i plan to go all electric in the future. 


Now, lastly the power band for the ME0708, it likes to run at higher speeds, 2000-4000rpms. So I chose a bi-directional hydraulic gearpump that moves 1/3 the fluid as the current Parker/Denison gearmotors. That way my new pump spins 3x as fast. So the ME0708 can spin 2000-4000rpms.


So I found an Honor Hydraulics gearpump, it moves 0.52 cubic inches per revolution (8.4mL plenty small)  
Honor 2MM1U08.  
 
Also added a high pressure accumulator. There is no cooling as i hope to only use it for 10-20minutes at a time.

PARKER Diaphragm Accumulator: 10 cu in Fluid Volume, 10 cu in, 11 gpm Max. Flow
Item 6NZK0 Mfr. Model AD016B25T9A1


So thats my tenative plan:
ME0708 
Sevcon 4q reversable controller

Honor 8.4cc pump
tee's, solenoid valves, hoses.
lovejoy coupler.


 
 
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Friday, August 16, 2024

Re: [electricboats] Anyone with ME1616 experience? planning to run one at 48VDC, what is the actual kW available? 6kW continuous?

I'm building a 96v as +48 & -48 dual hot rail system by tapping the middle of the battery for the safety ground. The boat is a converted Endeavour 34 catamaran and will have dual ME1616 motors on saildrives. There will be 4x 34S 280Ah LiFePO4 DIY batteries. Both positive and negative are hot and have their own disconnects (fuses, breakers, contactors and disconnect switches). Sevcon motor controllers, inverters, converters, chargers and solar charge controllers are 96v isolated versions so they work with the +-48v. 
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