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Author Topic: Blasphemy..... Solar power.  (Read 37550 times)

Nonni

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Re: Blasphemy..... Solar power.
« Reply #375 on: December 06, 2017, 08:29:49 PM »
solar power is now a day a best option and also in trend…it is quiet costly but one time investment…i live in hostel..and they plant solar plates..n we are happy with that…

BruceM

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Re: Blasphemy..... Solar power.
« Reply #376 on: December 06, 2017, 09:32:19 PM »
Adev-  The old thermal model of radiation being safe unless it literally cooks you (the insane "microwaved hot dog theory") has been widely disproven.  That is NOT the mechanism by which cell function in living organisms is affected.  Industry promotes this myth since it allows very high peak levels which are handy for digital communications. 

Plenty of researchers and doctors around the world are concerned.

www.bioinitiative.org

As for human robustness to microwaves...if you check with a fair group of friends of all ages you'll find few that don't have a collection of chronic, typically autoimmune related health issues.  Commonly, your doctor might tell you it's "stress".  I agree, but the stressor may likely be environmental and perhaps EMF. How would you know without checking? But obviously, I'm biased.  I think that EMFs that can be simply and readily avoided should be. 






oldgoat

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Re: Blasphemy..... Solar power.
« Reply #377 on: December 07, 2017, 03:48:34 PM »
They were much lower requency than a mobile but the Radiated power was high much more than the 4 watts from a mobile towerb (50 Kw) for the local stations and (12Kw) for the 2 short wave aerials In those days they ran for 19 hrs a day. The favourite trick to impress the young trainees was to give them a fluorescent tube and watch their faces as it lit up from the radiation we would also earth the guy wires on the tower and draw an arc and they were most impressed to hear the programme playing over the arc

Nonni

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Re: Blasphemy..... Solar power.
« Reply #378 on: Today at 11:09:24 AM »
This is all certainly interesting, but it's hard for me to understand. I heard the opinion from my friends and read many articles about the advantages of water heaters (if you would be interested one of them https://www.newtanklesswaterheaters.com/7-myths-tankless-water-heaters-need-stop-believing/). I'm interested in how much battery power and what do I need to connect tankless water heater, and not worry about the electricity bill....

AdeV

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Re: Blasphemy..... Solar power.
« Reply #379 on: Today at 05:02:53 PM »
They're talking about gas-fired combi boilers. Solar panels might run the igniter and the pump, but it won't replace the gas....

To run an "instant" electric shower you need between 7.5 and 10.5 kW at around 230V~; that's a 40-45amp breaker, if your PV battery setup is at 48 volts, you're looking at supplying a constant 200amps to run your shower. That's pretty meaty, and I'm not entirely sure there's an inverter built to cope with that, and you'll need a beast of a battery bank to power it...

Nah - if you're going off-grid with solar, you're FAR better off heating a big tank of hot water using direct solar energy, rather than making electricity then using that to heat the water. Then simply mix with hot & cold under gravity (or pump) for your actual shower. Or use the "bush shower" idea that Mike showed in another thread.
Cheers!
Ade.
--------------
1x Lister CS Start-o-Matic (complete, runs)
0x Lister JP4 :( - Sold to go in a canal boat.

BruceM

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Re: Blasphemy..... Solar power.
« Reply #380 on: Today at 05:53:25 PM »
Try builditsolar.com to get better educated on solar hot water. 

On demand gas h/w for a backup to solar is reasonable, if your water mineral content is suitable. On demand uses lots of surface area of fine tubing to quickly transfer a LOT of BTUs to the water.  This small tubing is vulnerable to scale and mineral build up so it's a bad choice for some water sources.  The flow sensing to turn on the gas and flow/temp gas regulation has also been failure prone on some models for some water sources.

So depending on the unit and water mineral situation, on-demand can be a far cry from the reliability of the old electronics-free tank with pilot and burner, with it's inherent low efficiency (about 60%) due to stack heat loss. (Vent stack inside tank creates thermosiphon of air to cool tank 24/7.)


basewindow

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Re: Blasphemy..... Solar power.
« Reply #381 on: Today at 09:04:56 PM »
I've had an 'Off Grid' place for a good few years now,  being there 3 days a week, four back at home (still have to work unfortunately). Its only a small place with one bathroom with shower and bath and sink, small kitchen, small laundry. So a total of 4 hot taps. I had the same dilemma when installing hot water. After much consideration i ended up going with an propane (LPG) on demand unit. I used a Bosch Hydro Power 16 for several reasons.

Pros: Reasonably cheap to purchase(compared to other models/brands), easy to install and maintain, quite efficient on gas(over tank and pilot based system), requires no extrnal elecricity to run. Instant* hot water (after about 20 seconds of cold)
Cons: Takes some getting used to in operation, one part is prone to failure and expensive to replace, as the units are not manufactured and used to the same degree as the normal grid connected units, parts are harder to come by.

Efficiency wise its one of the things that uses the least gas, probably becase it only gets used 2 to 3 times a day for short showers, washing dishes etc. The gas fridge uses more.

I dont have to heat a tank full time when im not there or wait for it to heat up once I get there if I turn it off.

The part that fails quite often  is the is the small water turbine that creates a spark to ignite it once water starts flowing. It is well documented. I purchased mine 2nd hand and it failed after 2 years. The parts are available but hard to find and from memory cost around $250 au. But there is a work around, that although not perfect worked for me. Simply replaced the power source with a couple of D cell batteries with a switch to inside. Switch on hot water. Batteries last about six months.

Requires a certain flow rate to ignite, so hot water has to be turned on first and cold added to reach the required temperature. A bit fiddly sometimes when you want a shower.

Im sure there are better more reliable units available but I was doing this on the cheap.

Its all pressurized to 30psi and uses a small on demand 12v pump, Flojet or similar.

I thought of solar hot water in its various forms, hot water solar panels and tank on roof, gas assited solar, the old layers of black tubing on the roof. It either got needlessly complex or too expensive.

There are many other options off gridders use as well that aren't solar related.

Just my experience for my circumstances.

1953 CS Lister 3.5hp, 1938? Bamford SD1 3.5hp, 1962 Fordson Super Dexta.

starfire

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Re: Blasphemy..... Solar power.
« Reply #382 on: Today at 09:36:06 PM »
We call these things a caliphont here in NZ, and can highly recommend them. Mine is a "Rinnai" brand, it uses 2 D cells to run the igniter, these last around 5 years.. Despite its cheap appearance, it has served me with no issues at all for 17 years. It has many  safety features,  a 20 minute timer that limits the time it can run.... in case a pipe bursts etc. It will shut down if water pressure drops, and requires a minimum flow rate of 2 liters a minute. This runs my shower, and kitchen tap.. I use around 9 kilos of LPG in a 6 week period, showers every night. One nice feature is the instant hot water when the tap is turned on.... no waiting cause they can be mounted close to the tap.  Also saves money on not needing a shower mixer, the water temperature is adjusted  on the caliphont instead, and will hold its setting very accurately over time. The flow rate can also be adjusted with a second knob.
Rain water is fine for these, after all, rain is distilled water and has no added "goodness" unless you live in a some polluted place.