Electricity. Power. Watts and amps. One may not NEED power living OTG (we still have some folks with gas and oil lamps and no refrigeration) but it is a helluva lot easier and, in the long run, likely cheaper to have power rather than not if you are building or doing anything significant. And so we modern OTG’ers are more than inclined to go get us some power.
When I started out back in the day (2004), making power meant a genset or two, some solar panels, batteries and an inverter that took the 12/24/48 DC volt battery bank to 120/240v AC. And that, at the time, was a bit on the sophisticated side because my system could be charged both by generator and/or solar. Plus you could use ‘cheaper’ appliances and lights (mass produced fluorescent or incandescent) rather than automotive or marine 12 volts appliances and lights.
I added a wind turbine rather quickly but it was largely useless. In those days, the ‘little’ $700.00 wind turbines put out 400 watts between 24 and 28 mph of wind but virtually nothing under 18 mph and, if the wind increased beyond 30 mph, the turbine stopped (braked) so as not to burn out. The only practical improvement one could really make to the overall system was adding more panels and more batteries.
Of course, those batteries were of the lead-acid kind and, as a rule, they lasted only about five years due to crude construction, improper maintenance and heavy use. They were an obstacle to any kind of long term reliability. Mostly it was maintenance and use. “Batteries don’t die, son, they are murdered.” Which turns out to mean that, if you took out the plates and acid and cleaned everything up and fixed a bit here and there, there is likely enough material to go another five years.
Today, things have improved.
Firstly, panels are a lot cheaper nowadays and are also a smidge more efficient. Back at the turn of the century, I paid $5.00 a watt. A 125 watt panel with 15% efficiency was $625. Three of them cost over $1800 and were rated at 375 watts – which they never seemed to achieve. Today, a panel is usually around 17 -20% efficient and costs $1.00 a watt. I can buy a 350 watt panel that outperforms the earlier 3 panels for $350.00. There is NO question solar works. And more modern solar works even better. I currently have 3000 watts of potential power (the sun has to shine) and it is adequate for our needs in the summer. More than adequate, actually. It is adequate for our needs in the Spring and Fall, too. My solar is of diminishing impact by late October but picks up again by early April.
Batteries have improved…kinda…. Back in the day, the Surette battery was the best but they were so expensive most people used old ‘large’ heavy-equipment batteries. I used 8D sized batteries designed for buses and heavy equipment. Some used L16s. Many used a sad collection of old car and truck batteries. Today, I use Discover batteries which are still lead acid but better designed (like the Surettes) but Discover’s Lithium Ion are showing themselves to be up to the task and they are smaller and better performing. But they, too, are expensive as hell. It is hard to make that kind of investment ($20K) when you just know that the next generation of battery will be even better. When that happens. If it happens. Someday. Maybe.
But, as you know, I eventually get to the point of the blog and the point is this: The Chinese are now putting out a way more efficient wind turbine that operates at lower wind speed. Or so they claim. Unverified. Cheaper, too. I can get a 10000 watt wind turbine for $1000 that will work at 8 mph. I have not yet studied what it produces at such a low wind speed but I always have 8 mph and so 24 hours at even a low generation is still a lot of juice. I am very close to making this addition happen (more research is needed). If it works it will work best when I need it the most – Winter.
Hydro power is by far the best overall. But not everyone has a fast running creek or stream to tap into. Mine is half a kilometer away. So, generally speaking, 3000 watts of solar power with a low speed wind turbine and twice as much good battery storage (I have 400 amp hours. I could really use 800 – 1200) and I would be doing as good as I need to. The goal: limited genset use in a typical year’s winter (which we may never see again).
“Dave, if others use kerosene lamps, what are you using that requires so much juice?”
This is point #2: we have a washing machine (no dryer) a modern electric fridge. That fridge is incredible. Very low draw. And two freezers. We watch NetFlix and run computers plus all my tools now and then. There is the water pump, all the kitchen appliances, battery chargers and all the lights (now LED). Plus, once a month or so I use the ‘funicular’ which carries heavy stuff up the hill. In the summer, I have and use sparingly a small portable air conditioner. We are old softies, really.
The irony to living OTG is that you try to create the ease of modern living. And you work like a dog and spend like a celebrity to do it.
Epilogue: A few hours research has confirmed original doubts and fears. Reviewers in NZ, Aus and the USA have described the new Chinese Wind turbines as using ‘new Chinese watts’ with which to rate their output. They are not true. And, worse, 80% of the turbines are still poorly made. It seems there are a few good ones but they are also performing like the old ones with only incremental improvements. The best foreign wind turbine is from Turkey. It is something called iSTA BREEZE. Comes in 1000, 1500 and 2000 watts. Real watts. MY Air-X is considered as good but mine is just 400 watts. The new Chinese turbine is largely a hoax! Fake news! I also learned that ‘jamming in’ turbine juice meets with resistance and the bigger the bank, the more resistance. A small charge of say, 3 or four amps, won’t even register. So that accounts for me getting ‘nothing’ until 18 mph and then getting 8 amps all of a sudden. I did not know that.