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Old 02-23-2017, 10:27 AM   #1
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Default Future charging systems

Even though we have a large engine charging system in our Roadtrek, I have always looked at them as a bridge until something more practical comes along, better than an Onan, but not ideal. Low rate continuous charging, IMO, would appear to be a much better way to go. It would require smaller everything, from wiring power handling items, to less battery capacity.

All energy is really heat based, so heat also seems like a logical source of the power for an 12v DC source, and vehicles have heat available from fuel if they have gas, diesel, or propane on board.

I often randomly do different search terms for stuff I am interested in like the small power generation mentioned, and I ran across this technical paper. Interesting because it generates electrical power without moving parts, kind of like solar, except for the fact they have a tiny combustion fan on the sample design.

http://jxcrystals.com/publications/2...er%20TPV-9.pdf

10% heat to electricity conversion efficiency is probably not all that bad compared to a conventional generator, but likely a bit lower.

An item like this is it did a continuous 120 watts would give you 240ah per day, which is more than all but the very big power users among us would ever need. We could easily get by on 1/2 of that much, so only 3 times bigger than the unit described in the paper. By running continuously to replace used power and/or currently used power, you would need much less battery capacity, probably no more than enough to cover 1 days use. They would also be near to full or full for large amounts of the time, I think, which would be a big benefit for lead acid batteries, either wet or AGM.

I thought it was very interesting that they specifically mentioned the unit, with fuel container, would have a much higher power capacity to weight ratio than lithium batteries. They did not compare to a standard fuel powered generator, however.

I could very easily see a class b with a 100 watt module of this type of generator, maybe 300 watts of solar, and 200ah of batteries (more if you used high rate appliances a lot). No Onan, no engine generator, and no noise, all while being totally silent and unobtrusive, and able to stay offgrid, with no driving, for as long as you had fuel for the unit.

The future is coming......as they say
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Old 02-24-2017, 01:23 AM   #2
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Micro Nuclear - got to be in the future.
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Old 02-25-2017, 02:45 AM   #3
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EFOY would do that. Fuel unobtanium and fuel expense was the downside.
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Old 02-25-2017, 03:00 AM   #4
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EFOY would do that. Fuel unobtanium and fuel expense was the downside.
What the combustion fuel would be was one of the glaring missing things in the article, I think. They talked about a fuel canister, so might be something as simple as a propane tank, or it could be as yet undetermined as this is a pretty early, theoretical, design paper.

It is interesting that when I went looking for more information on this kind of generator, I found a lot more on other versions of the idea. They are working on solar panel stuff that will generate power from the IR and UV parts of the spectrum, so if combined with a regular solar panel they could get more power out of the same light.
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Old 02-26-2017, 01:16 AM   #5
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Several thousand degrees is a bit much for an RV, doncha think?
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Old 02-26-2017, 01:54 AM   #6
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Several thousand degrees is a bit much for an RV, doncha think?
Furnace flame, stove burner, combustion in Onan all can easily be that hot also, the device just needs to be designed to handle the temperature and safely get rid of the exhaust.
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Old 02-26-2017, 03:47 AM   #7
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I'm thinking of buying an ELECTRIC tandem bicycle and taking it with us and using the roadtrek to take to bikepaths

the Pedego Tandem is what we are looking at

https://www.pedegoelectricbikes.com/...andem-cruiser/
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Old 02-26-2017, 12:53 PM   #8
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That looks a lot more like a power user than a future power generator

I would think that if you don't have shore power, the recharging would be quite a hit on your coach batteries. Looks like the battery options would take 40 or 60ah at 12v plus charging inefficiencies of and inverter to 110v and then a charger back to 48 volts.

82# is a hefty amount of bicycle, so it is a good thing it has a motor, I think
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Old 02-26-2017, 01:37 PM   #9
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That looks a lot more like a power user than a future power generator

I would think that if you don't have shore power, the recharging would be quite a hit on your coach batteries. Looks like the battery options would take 40 or 60ah at 12v plus charging inefficiencies of and inverter to 110v and then a charger back to 48 volts.

82# is a hefty amount of bicycle, so it is a good thing it has a motor, I think
My wife has 2 knee replacements and somewhat painful legs. this is equal to 2 bikes.

this bike can go entirely on electric power. no pumping at all is needed(as long as the battery is good) we are going to test it out at a dealer.

it's either this or no bike riding for both of us -just me alone. it's the best option for us. i did not even know it existed before 2 weeks ago.
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Old 02-26-2017, 02:15 PM   #10
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Originally Posted by gerrym51 View Post
I'm thinking of buying an ELECTRIC tandem bicycle and taking it with us and using the roadtrek to take to bikepaths

the Pedego Tandem is what we are looking at

https://www.pedegoelectricbikes.com/...andem-cruiser/

Hi, I've been semi-researching e bikes for me alone for awhile. I just ordered one this week and may have it Tuesday. It has 50% more power than the one you cited with an 11.6 amp battery, 48 volts. Yours said an option of 10 or 15 amps.

https://www.radpowerbikes.com/pages/radmini

But this e bike stuff is just like a B rv, determined by application. Mine is to not pedal, very very little. I tentatively plan to carry it folded on a swing out hitch frame arriving soon too. Then very simple and easy to access the rear doors as usual. Spare remains on an 05/04 Roadtrek 190P.

Wishing you the best with an e bike, go for it. Or motorcycle? jet ski, snowmobile, .........

Bud
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