Where can I see the pictures?
On 9/21/12, Kevin Pemberton <pembertonkevin@gmail.com> wrote:
> OK, I agree, efficiency of peltiers are lousy. They take many machine
> hours to produce compared to solar panels so the cost is higher. If
> however you are on a boat and your solar panel is subject to shaded
> areas poly panels are your best option if efficiency is important to
> you. Poly panels are the cheapest panel on the market and many more sq
> inches are required to do the same job as crystalline panels do. Why?
> the big "E" word we are talking about. Why are the low efficiency
> panels a better choice on a boat? Because they keep charging even when
> partly shaded. The most productive PV panels become an anchor when even
> partly shaded. If you are collecting heat rather than moving electrons
> your loss is minimal. Loss= sq. area shaded.
>
> My seebeck generator is only 1.5 inches thick, 1ft square, has plumbed
> heat sinks to transfer heat using liquid. With a simple set of valves to
> the collector I utilize Night sky effect as well as the sun to increase
> temp difference here in the desert without over heating the junction.
>
> Because I use wood gas to cook with, the heat is a by-product from the
> gas generator. My plan is to increase the solar collector, and switch to
> methane gas to cook with. It is at that time I will understand fully the
> size of the panel I will need to keep my seebeck generator running 24-7.
>
> I am not bias. I have a couple of nice size solar PV panels. I have two
> wind generators made from salvaged parts from 2000i generators. The home
> brew MPPT wind generator controller is designed to keep the generator
> spinning at optimum RPM. You see I had one of my wind generators go open
> circuit on me and discovered 240v with my cheap multi meter. To make a
> point, the diode bridge I am using is salvaged from a 12v commercial
> truck alternator and even with the 240v output it didn't blow any diodes
> ( what is the rating on those things anyhow?). I distil my drinking
> water using a home brew solar still. My boat today is a canoe with an
> electric paddle. I am looking into carbon fiber lead acid batteries to
> lower battery replacement costs in the future. My swamp cooler will be
> replaced as soon as I can with a cooling tower/ solar chimney, as soon
> as the chicks can take care of themselves.
>
> Today I lurk more than participate on this and many other related lists,
> to get news about new or highlighted developments. My Catalina 30 is
> history, but it's conversion is the reason I found this list. I hope you
> folks understand that sometimes I just must offer my ideas. More
> important. If I do voice an idea it is likely I felt the topic needed
> another option.
>
> Honest guys, I almost abandon the seebeck idea myself but I am glad I
> didn't I have to many sources for heat to waste it.
>
> Kevin Pemberton
>
> On 09/21/2012 12:03 PM, Julian Webb wrote:
>> - but isn't the efficiency of peltiers lousy?
>> - i'd heard the $/W was way worse than most anything else e.g. solar
>> panels
>> - i appreciate the sun doesn't shine all the time but then again your
>> generator shouldn't be running too much either, and the heat generated by
>> us 'meat puppets' etc below decks takes more energy to harvest (fans etc)
>> than a peltier set up would return?
>>
>>
>> On 18 September 2012 05:53, Kevin Pemberton
>> <pembertonkevin@gmail.com>wrote:
>>
>>> **
>>>
>>>
>>> It might be time to pipe in.
>>>
>>> If I were to use a transportation alternator I would likely use a
>>> commercial truck alternator. They are built to be abused. Second thing
>>> is
>>> the diodes used in this type or automotive alternators will withstand
>>> over
>>> 100v. For this reason I would likely change the regulator to run at the
>>> 48v
>>> charge voltage.
>>>
>>> If I were to consider using a 3ph alternator I would consider
>>> downloading
>>> a PDF from the national renewable resource labs called investigation of
>>> self excited induction generators or something like that. I would carry
>>> it
>>> a little further and parallel the windings of the induction motor to
>>> half,
>>> or more, the output voltage.
>>>
>>> as the air cooled diesel goes. I bought a 4000w genset on Amazon a few
>>> years back. The injector pump was jammed because it was assembled wrong.
>>> I
>>> fixed it by assembling it the way it should have been. Because of the
>>> problem, I had to replace the pump withing a year. No one was there to
>>> return the generator to. Being one cylinder it is loud, vibrates a
>>> bunch,
>>> and has never burned clean. Heat must be removed from below deck when
>>> air
>>> cooling as well. The advantage of water cooling is recovery of heat in
>>> the
>>> form of hot water.
>>>
>>> If you would like quiet. I might suggest Peltier junctions. TE inc. in
>>> Michigan has Engineering papers to help design the system. I have built
>>> a
>>> 12v system and it cost me 250 US 150 of that was the junctions used two
>>> years ago. Because cooling water is available and the system works in
>>> heat
>>> variations as well as moving that heat. A system on a boat would be a no
>>> brainer. The heat can come from more than one source. Solar is a good
>>> choice because a meter squared of collector area in clear skys is good
>>> for
>>> 1000w of heat. When at rest solar can top the batteries. When in motion
>>> any
>>> heat source will do including a stove top burner. The system could be
>>> referred to as a solid state heat engine.
>>>
>>> The system requires that energy only travels in one direction so diodes
>>> are needed.
>>>
>>> Have fun and happy sailing.
>>>
>>> Kevin Pemberton
>>>
>>>
>>>
>>>
>>>
>>> On 09/15/2012 11:42 AM, Robert Lemke wrote:
>>>
>>>
>>>
>>> Good thread. I am considering using a new 10 hp air cooled diesel on
>>> ebay for $619 and (4) automotive alternators to charge a 48 volt bank.
>>> Entire set up should be only $1K and produce just shy of 7kw of
>>> charging.
>>>
>>>
>>> http://www.ebay.com/itm/NEW-10HP-SMALL-DIESEL-ENGINE-WITH-ELECTRIC-START-10-HP-/170672262621?pt=LH_DefaultDomain_0&hash=item27bcdc0ddd
>>>
>>>
>>>
>>> Bob
>>>
>>> --- On *Sat, 9/15/12, hardy71uk <dottir@hotmail.com>
>>> <dottir@hotmail.com>*wrote:
>>>
>>>
>>> From: hardy71uk <dottir@hotmail.com> <dottir@hotmail.com>
>>> Subject: [Electric Boats] Re: 48v diesel telecommunications standby gen?
>>> To: electricboats@yahoogroups.com
>>> Date: Saturday, September 15, 2012, 10:27 AM
>>>
>>> I'm thinking of using a 3phase generator . Use three transformers to
>>> bring
>>> the voltage down to the required value . Make the output DC via a 3phase
>>> rectifier. Should make a simple charger.
>>>
>>> Chris S
>>> --- In
>>> electricboats@yahoogroups.com<http://mc/compose?to=electricboats@yahoogroups.com>,
>>> Michael Mccomb <mccomb.michael@...> <mccomb.michael@...> wrote:
>>>> other than the Panda stuff which is VERY expensive has anyone come
>>> across a 48v dc diesel charging system.... i'd rather use a sort of
>>> RAID
>>> approach with a much less expensive diesel/PMA system but am pushing the
>>> limits of my understanding to devise such a system.... seemingly both
>>> diesel engines AND permanent magnet alternators
>>> of sufficient power/capacity can each be had for under $1k... some
>>> electronics is undoubtedly needed but adding this would still bring a
>>> system in perhaps 10k under the Panda price
>>>> one can stumble across all sorts of reference to 48v diesel units used
>>> for telecommunications systems but i have had great trouble actually
>>> tracking such a unit down
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>
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