My electrical power. Needs & Wants.
Most electricity that I have used at my property, has arrived in fully charged batteries, of my many cordless tools, work
lights entertainment devices and vehicle. I have never really sat down to quantify my domestic power usage, at the property. Most of the electrical
energy I use, is used outside, when I use chainsaws, hedge cutting equipment and carpentry tools. On an average day, I will go through a third of available battery power, on these devices.
The only things that are recharged at the property , are done from my vehicle battery. I recharge my phone and a small movie player. I'm not going without anything. There's plenty of light, I can access the internet, listen to music, or watch a movie, while talking on the phone.
But, now that I'm making serious plans to move there full-time, on-site power generation will happen.
Solar panels have worked out much better than wind power, for my tenant. He put about $600 into each, but gets 90% of his power from the panel.
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So, here's the breakdown.
Lighting. 50 Watts. If I switch on several of my LEDs, to light the whole place up like a
greenhouse, it consumes almost 50 watts. Let's say I do that for 5 hours a day. That's 250 watt hours.
Water pumping. My water needs to be pumped vertically, 12 feet and about 100 feet horizontally. A Milwaukee 18 volt, cordless water pump can move 240 gallons on one charge of the five amp hour battery. I have
enough battery power to move 1200 gallons of water. I generally use 20 gallons or less per day, but I could see stepping that up quite a bit, once I buy the pump. So, let's say we use 120 gallons per day. All of my Milwaukee batteries combined hold a little less than 1/2 of a kilowatt hour. So, I need 50 watt hours of electricity per day, to bring water to the cabin. The small amount of power required for a cigar pump, for the
shower, is not part of this.
Radio. My Makita radio uses about 100 watt hours on an average day.
Television. I have a television that uses an average of 40 watts. Let's go with 5 hours for a total of 200 watt hours per day.
My cell phone, which is also my computer uses such a small amount of power, it's not included here.
Adding it all up
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Lights 250 watt hours
Water 50 watt hours
Radio 100 watt hours
TV 200 watt hours
That comes to 600 watt hours. This is much more power than I've ever used in the cabin. It would allow me to run the lights more than I do, to consume considerably more water than I have before, to listen to the radio at low volume, all day, and to watch 5 hours of television. Seems like a lot.
A couple years ago, I talked to an electrician friend about the possibility of surviving on one kilowatt hour of power per day. He equated this to freezing in the dark. But, I have sat comfortably in the light , using my cell phone and movie player at the same time, and used less than a quarter of this much power. So, for me I think it's quite reasonable.
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I've left out one big item. Refrigeration. I have only used a portable cooler and a rudimentary
root cellar, at the property. If I decide to go with powered refrigeration, that would have to be factored in.
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Otherwise, it looks like I could get by just fine on a system that produces and stores one kilowatt hour of electricity per day.
I would still always arrive at the property, with my cordless tools fully charged. In the event that I drain the cabin battery somehow, I would grab some batteries from the vehicle and continue in relative comfort and connectivity. When the cabin produces more power than is needed for evening use, I would charge up cordless chainsaws and other things that are used outside. As stated earlier, I generally arrive with enough power to keep me going for 3 days, so I don't think there's any need to build a huge amount of excess capacity.
That's about it. So, I'm going to shop for a one kilowatt per day system.
In the event, that the system proves too small, because I go in for more electrical stuff, or fill the cabin with other people, this small system will be moved to the little
Greenhouse / Spa building, that has lower energy needs. Just lights and entertainment. Lighting for people, not for the greenhouse portion of the building. The sun works quite well at that.
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I think that's all.
I enjoy all the benefits of having electricity, currently, and I don't have an electrical bill. My place is about $50,000 away from the public utility lines. I'd have to be nuts to hook up, considering my usage patterns. :-) After explaining this to a friend who is visiting, he asked why I don't just hook up to BC Hydro. Not exactly a mathematician. :-)