Solar Hot Water

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Solar Hot Water

a developmental solar electric water heater for the [[flint house]] in Barre Vermont

[[overview]]

Review of this [[system diagram | http://docbox.flint.com/~flint/solar_electric_hot_water/html/topl000.htm]] of this proposed installation should be reviewed or referred to as part of this document.\n*0 [[Design Rationale]]\n*1 [[Solar Panel Array]]\n*2 [[DC Cable Array]]\n*3 [[Battery Storage]]\n*4 [[Copper Bus, Max Distance 2 feet]]\n*5 [[15 KW Inverter]]\n*6 [[Two Phase AC 100 AMP Per leg]]\n*7 [[Tankless Electric Water Heater]]\n*8 [[Furnace Hot Water Feed]]\n*9 [[Oil Boiler]]\n*10 [[Cold Water]]\n*11 [[SE Hot Water]]\n

! Design Rationale\n\nThe basic idea here is that while you use hot water in the summer for about 1 hour, the sun is out for about 6-8 hours here in Vermont. I hear the oil system kick on during the summer to heat the water for the house and this makes me crazy, as I hate to waste oil.\n\nSo here is the plan:\n* Solar Panels - Array with a 3 KW capacity feed a\n* Battery Bank - Of Golf Cart Batteries likely with a 1:1 panel-to-battery feed. In series these feed an\n* AC Inverter - Which is rated for 15 KW Two Phase. This feeds an \n* In Line Hot Water Heater - In line with the existing oil hot water heater.\n\nWhich gives me hot water when I turn off the oil furnace. I will work the [[numbers]] on this presently.\n\nQuestions:\n# Should the oil or the electric in line hot water heater be first in the cascade? Why?\n# Do you think that the numbers will work?\n

! Solar Panel Array\n* The Solar Panel Array will be comprised of a 3 by 8 grid of 120 watt 12 Volt Panels.\n* These panels shall be mounted on the southeast roof of my [[house | www.flint.com/home]] attached Barn. \n* Each panel will need a given efficiency of 10 watt per square foot. \n* The overall yield of the array will need to be about 3KW per hour.\n* Each panel will be attached via the [[DC Cable Array]] to charge one golf cart cell in [[Battey Storage]].

! Battery Storage\n\nThe solar panels, which are designed to charge 12 volt batterise are\nattached on per panel to a pair of 6 Volt Golf Cart Batteries. The DC\nCable Array includes Diode Stearing will be needed in order to then\nconnect the Golf Cart Batteries in series.

! DC Cable Array\n\nThe solar panels, which are designed to charge 12 volt batterise are\nattached on per panel to a pair of 6 Volt Golf Cart Batteries. The DC\nCable Array includes Diode Stearing will be needed in order to then\nconnect the Golf Cart Batteries in series.

! Two Phase AC 100 AMP Per leg\n\nIt turns out that the design objective is to use one of the in line solar \nheaters that requires a two-phase feed. The deal here is that these \npuppies need 15 KW to operate. The good news is that they only need to \noperate for about an hour a day. The inverter (or inverters) supplies \n110v per leg 180 degrees out of phase for an agrigate peak-peak voltage of \n220 volts, at 75 amps RMS per leg.\n \n

! Tankless Electric Water Heater\n\nIn Line Electric Water Heaters are available commercially from several sources. They are divided into two categories, [[individual tankless heaters]] and [[overall resident tankless heaters]]. Click for examples.\n\n\n\n

! Here are the proposals at variance\n\n[[Dual Core | http://www.sustainabilitynh.com/products.php?product=sundrum-hybrid-solar-electric-solar-hot-water-systems ]]

! Individual tankless heaters\n\n\n[[ PowerStar AE 12 Tankless Point-of-use Water Heater | http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100019685&N=10000003+90401]] {{{ 12000 Watts. }}}\n

! Central resident tankless electric heaters\n\n[[ Heavy Duty | http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100094582 ]] {{{ 26850 Watts.}}}\n[[ Light Duty | http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100092283 ]] {{{ 17250 Watts.}}}