Green Building Bible, Fourth Edition |
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These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment. PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book. |
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Posted By: LouiseSJPPThis means there is neither an economic case to be made for a solar installation nor an ecological one.
What we do have instead is a practical case. We have a 25amp mains supply, and to upgrade it would be very expensive. It's also unreliable, subject to failure in wind and rain, and sometimes for long periods, living in the wilds as we do. We remain interested in an almost offgrid installation.
Posted By: revorCharging from the grid seems like your best option but you will have to decide on what size. There are a couple of issues to consider how big a capacity for storage and how much current you want to supply. If you were charging via solar a nominal 48 system you would need a sizeable inverter and hefty cabling to get say 40 amps so a 240 V battery array would be the best option. That gets you over the low voltage high current scenario and you then need to decide the size of your "bank". At nominally 2v per cell you could be talking a lot of batteries wired in series to give you the volts and paralleled to give you the capacity so not a cheap option. Used batteries from FLT ex submarine or UPS could be an option. I have no experience of these but I was aware of someone who did an array of batteries' using ex UPS batteries but being off grid charged them up with a generator driven by a tractor using diesel so not very green. UPS bats are changed well before the end of their life so are good bet if can get hands on them. Then there are ex EV batteries if you can get someone knowledgeable to configure a set up. A friend has just bought 20Kw from a scrapped BMW for his solar system linked to a 10Kw inverter but had someone supply it and configure it.
blockquote>Posted By: Peter_in_HungaryOr you just get a Tesla powerwall or SunPower SunVault, or the Enphase Encharge (others are available) get a manufactures guarantee and support, plug and play and off you go and save your self all the problems of a home brew bit of kit.
Posted By: revorYes fine if you have deep pockets £900 -£1000 per kwh so looking at 3/4 Powerwalls you are looking at £30/35K + inc install for a 40kwh job that may see you with good management through a lengthy power outage.
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