Hi Julian
I recommend you contact Don Pulver of Eniquest who manufacturer really well engineered 48v DC gensets here in Australia. (You'll see link below and the name will be Watts2C but the company name has recently changed to Eniquest even though the website is still Watts2C) I know of one these units that has been running in a 45 ft cat now for around 2 years now and the owner is satisfied by it.
Don has been building gensets for miltary use for many years and you see the engineering outstanding.
Cheers
Chris
On 02/05/2012, at 2:58 AM, Julian Webb wrote:
Hi Steve- Thanks for the input.- The main reason for the 110-230 vac battery charger is she will spend a lot of time on English, French and German canals, and a lot of the time they have a 10-15 amp outlet you can plug into for a small or no mooring fee, so your battery top up is as good as "free".- The DC genset is looming as s huge problem, I simply can't get a quote or lead time from the 5 companies I've emailed, including PolarMarine.- I'm beginning to think it's going to be a 50 HP low rev diesel (in a noise cabinet) and 5-6 48 vdc alternators running at 80% output to drive the motors directly, and then as a battery charger to top up the bank when needed.- Sounds a bit primitive but it's technology I understand and can therefore fix, and it's still way cheaper and quieter than straight diesel drive.Cheers, JulianOn 1 May 2012 11:44, Steve Dolan <sdolan@scannersllc.com> wrote:
Jules,
Without the basics it's hard to deturmine what you need but as far as in general here's my inputDirect DC is preferred; it eliminates inverters to DC and simplifies the system. I have a AC genset and would much prefer a DC for simplicity however it really depends on the size of the system and whether the cost is justified for the more expensive DC genset. My genset has a manual variable output to manage the charging of the batteries. Something I have to pay attention to, the new gensets have an automatic start/stop which I'm a little leery of.
> it seems better to use a diesel generator to produce DC with a large enough capacity to power the electric drive motor(s) directly for the times when i need cruising speed.
> this will let me get away from the "usual" AC output genset that has to be converted to DC before being sent to the motor controllers(s).
Correct.
> add a battery bank of the same DC voltage as the generators output and the motor controllers input.
I'm not sure why you would want to go to single phase, a 240V will give you more amperage, a quicker charge and smaller wires. Depending on the battery type you also want a multistage charger.
> add a single phase battery charger for shore power top up.
Correct. I'm assuming this is a European boat. 120v for US system.
> add a 230 VAC output inverter to run the onboard appliances.
A genset with a heat exchanger is what I have and works great. I also have a 10 gal. HWH for the storage and heating during shore hookup.
> if i can get my hot water from the genset that about finishes the system?
Also plan on several switches so that you can't operate the genset and shore power at the same time as well as the inverter only when operating the genset.
> if i am heading in the right direction, i will bore you with the boat details, but i thought i would get the theory right before moving on to the practice.
> thanking everyone in advance
Hope it helped.
Steve in Solomons MD
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