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Old 21-08-12, 07:59 PM   #21
nickh
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Thanks Rob.

Always like to hear about green initiatives, though I am only a tinkerer myself more interested in the technology than saving the planet!

NHH

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Old 21-08-12, 08:01 PM   #22
RobSmith
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See http://wales.gov.uk/docs/desh/policy/100722tan6en.pdf

Scroll down to 4.15.1

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Old 21-08-12, 09:23 PM   #23
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That's quite an initiative! I think my interest in such things was kindled quite early with a visit to the centre for alternative technology in 1976 when my father was part of a working party to install a waterwheel.

NHH
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Old 21-08-12, 09:40 PM   #24
RobSmith
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That's quite an initiative! I think my interest in such things was kindled quite early with a visit to the centre for alternative technology in 1976 when my father was part of a working party to install a waterwheel.

NHH
An initiative.... maybe. I think you can count the number of people doing it on your fingers and toes. It is a fairly harsh set of rules but the benefits are on a par with our current situation and there are some great benefits that balance the hard work. It will be very difficult but then being conventional is getting more and more difficult too.
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Old 05-06-13, 05:13 PM   #25
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Hi Rob,

I'm thinking of a battery setup as partial off grid and in case of power cut. I have a 3.5HP cs not doing much and an almost free supply of WVO. The lister is not from a start o matic so lighter fly wheels and bit of a lazy governor. Our heating boiler is new and the controls are temperamental regarding voltage and Hz so I'm thinking my best course would be to drive a 12 volt car alternator charging a battery bank with a reasonable quality inverter. Is it that easy! you seem way further on with yours.
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Old 05-06-13, 06:00 PM   #26
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Is that where Frodo lives???
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Old 05-06-13, 07:16 PM   #27
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The battery voltage is sitting at 50.5v.

My next thing to do is test the generator i have here.
It is a 110v ac generator but has two 55v output windings in series. I want to connect those in parrallel to give me about 55v ac.
I will rectify that and smooth it somewhat with whatever capacitors I have here.
That might give a much higher open voltage but if I have that connected to the battery pack through a big diode then as the generated voltage overcame battery voltage current would flow but the batteries would hold the voltage down.
Edit: The generator is a 2kw unit so I am hoping to get a 30 - 40 amp charge from it.
The generator was designed for 50hz use but I am not bothered what frequency the output is as I am rectifying the output. One question I have in my mind is whether the self excitation will function? Hopefully by running it reasonably close to the speed it should run it will work ok.

My plan is to build in variable displacer movement in the Stirling engine to 'throttle' the engine and have some simple electronic controls. Those would control the battery charging by moving the linkages on the engine. I might do that with double eccentrics like they do on reversible steam engines. I am just scribbling that out now.

Heat will be supplied via rayburn or aga and stored in storage heater blocks and smashed up storage heater block 'sand'. I have 1400kg of those here to use and plan to use the lot to give a fairly stable heat source. 1400kg of those is actually quite a small volume. They are very dense.

Rob
Your generator outputs will need to be two separate 55v windings, not 110v centre-tapped as they will need to be in phase to connect in parallel.
Rectifying and smoothing with a relatively big capacitor will give you about 75volts dc. You could use a coil in series with the rectified output before the capacitor to do a bit more smoothing, but the capacitor is not really needed. without it the "average" voltage (the effective dc output) will be around 50v
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Old 04-08-13, 09:14 PM   #28
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Your generator outputs will need to be two separate 55v windings, not 110v centre-tapped as they will need to be in phase to connect in parallel.
Rectifying and smoothing with a relatively big capacitor will give you about 75volts dc. You could use a coil in series with the rectified output before the capacitor to do a bit more smoothing, but the capacitor is not really needed. without it the "average" voltage (the effective dc output) will be around 50v
Ok doke.
Thanks for the reply.
I have been utterly buried in design work for a month or so and have not been on the forum for ages.
Rob
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Old 06-08-13, 12:25 PM   #29
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In uni, our lecturer always insisted that off grid battery set ups were more not economically viable unless you were really far away from the grid and were maintenance heavy.

I was just wondering, on a per kWhr consumed basis, how do you imagine your system (including cap.ex + O&M) will compare with grid electricity in terms of /kWhr consumed.
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Old 06-08-13, 01:51 PM   #30
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In uni, our lecturer always insisted that off grid battery set ups were more not economically viable unless you were really far away from the grid and were maintenance heavy.

I was just wondering, on a per kWhr consumed basis, how do you imagine your system (including cap.ex + O&M) will compare with grid electricity in terms of /kWhr consumed.
I don't think it's a cost cutting exerise for RobSmith as he was intending to live a off grid life style for other reasons.
Any one under the illusion that off grid electricity is cheaper than grid power would be in for a nasty suprise, but then that not why off grid power set ups are built.

Matthew
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