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Old 09-03-2018, 20:20   #31
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Re: Hydrogen fuel cell generator

For a sense of scale the Mini 650's generally use about 40w of solar panels to run their boats on distance races. at about 9lbs. But they also generally carry a backup Honda 1kw generator 30lbs as a backup in case the solar craps out or they hit bad weather for a few days plus 10 gallons of fuel (65lbs). So figure a Mini 650 needs about 120ah/day to keep operating and dedicate about 100lbs of weight to that goal.

If these things can output 400w at 12v, it could run for about 15 minutes a day, or operate much slower and still have sufficient power. It depends on the conversions, and weight, as well as how much weight is being used in the batteries (That may be kept or scrapped depending on what the boat is already using), but there is a very good chance a Mini would see this as a huge weight savings.

Not to mention a reduction in the mental overhead of worrying about charging the batteries, how much juice is left... Even debating turning on the autopilot or not.
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Old 09-03-2018, 20:59   #32
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Re: Hydrogen fuel cell generator

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Originally Posted by Maiko View Post
It is actually possible to produce hydrogen on board. All you need is solar panels (not a secret that hydrogen needs energy to be produced) and an electrolyzer. The upside is that once you have the system set up you can create your own hydrogen with no cost whatsoever. Electrolysis is the process where hydrogen is separated from water. This way the process creates no emissions, too.
The downside is that you need solar panels and an electrolyzer, which have a relatively high upfront cost. Small-scale electrolyzer is about $5000.
And a pumping system that can put the hydrogen into those 5-10,000 PSI tanks that you use for storage.
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Old 09-03-2018, 21:04   #33
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Re: Hydrogen fuel cell generator

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The specs state 5.2 litres per minute consumption @ 400 watts. That's a lot of hydrogen to carry around.
Note when it's stored at 10,000 PSI (770bar).
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Old 10-03-2018, 05:03   #34
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Re: Hydrogen fuel cell generator

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Mini 650's . . . solar panels . . . backup Honda 1kw generator . . . . 100lbs
Stumble, You may be a bit out of date. The Mini's with cash are all already using fuel cells - 45 of the 84 fleet were using Efoy in 2017 race. That is 16kg's including fuel. These are methanol fuel cells. They typically are using the "Comfort 140" model at $4,999.

So the incremental weight gains from there are small(ish), the hydrogen fuel more difficult to deal with, the costs higher, and this particular market segment is still tiny (like 100 perhaps max units worldwide).

They units have this same 5000 hour life span limitation (when the membrane needs to be replaced at high fraction of unit total cost). So, it does work for this particular application, where you have a small electrical draw for 10 days once (or a couple times) a year (and where weight is a significant factor worth spending money on). As I said in my post above - the mini's and a few of the RTW race boats have (already) been using fuel cells. But that is a pretty small application window.

And hmmm . . . . 120 amp-hrs = 1440 watt hours (@ 12 vts) = 4 hours of run time rather than 15 minutes - right?
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Old 10-03-2018, 05:16   #35
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Re: Hydrogen fuel cell generator

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Originally Posted by Stumble View Post
For a sense of scale the Mini 650's generally use about 40w of solar panels to run their boats on distance races. at about 9lbs. But they also generally carry a backup Honda 1kw generator 30lbs as a backup in case the solar craps out or they hit bad weather for a few days plus 10 gallons of fuel (65lbs). So figure a Mini 650 needs about 120ah/day to keep operating and dedicate about 100lbs of weight to that goal.
40W? That's only about 200Wh per day = 17Ah, that's a long way from 120

I think you may have mis-typed a number somewhere.
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Old 10-03-2018, 17:03   #36
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Re: Hydrogen fuel cell generator

Wow I forgot how to do math last night.

Estar I didn't realize that many had made the switch already. I knew a few had but thought it was still a pretty thin sliver.
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Old 08-04-2018, 02:30   #37
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Re: Hydrogen fuel cell generator

Super cap technology is moving forward at a rate of knots, a tech firm in the UK are making headway with new polymers that can rival the efficiency of diesel. And with of course the minimum of recharge times.
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Old 05-06-2018, 02:23   #38
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Re: Hydrogen fuel cell generator

Patric Laine's Efoy. He loves it, especially after the engine stop during an 8 day crossing. (The summary at 4.21minutes.)

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