Re: Heating my greenhouse
Minor point of correction: electric heat is 100% efficient, you put one kilowatt of energy in, and get one kilowatt of heat out.....zero waste.
Originally Posted by Cariboocoot
The problem is the generation of electricity can be extremely inefficient....which I'm sure is what you meant.
In this case, 45w probably won't even keep up the self discharge on that size battery bank, much less leave any to work with.
Takingtime1 would do far better to do as ya'll have suggested, and build a well insulated greenhouse with lots of thermal mass to minimize the amount of heat needed to start with.....then use solar for direct heating of air or water, and store it for overnight/cloudy days.
Hey...that's what I'm doing !
When I first set up my PV system, I need a "power room" out as near to the arrays as possible to house the gear and batteries. So I benched out a place in the south facing side of the mountain, and built a combo solar room/greenhouse ( SWMBO got the greenhouse part ).
The small 4x8 section on the front left side is my power room, the 12x20ish on the far end is her greenhouse.
The back, far end and front wall are all earth bermed. The front is a permanent bed of strawberries outside now.
Homemade rafter/trusses made of 2x6 treated lumber/plywood gussets, on 24 centers. You can see the trackers I built for my two initial arrays before the drive actuators or panels were installed.
Same shot, taken from the house garage door.
20-175watt Solarworld panels, mounted on two home built single axis powered trackers, 10-245w Solarworld panels, mounted on home built dual axis tracker, 1 MX60, 1 FM60, 1 FM80, 24v bank of Absolyte 2v AGM GNP II cells 1200amp/hr, 2-GTFX2524 2500w Outbacks producing 120/240 AC, Trimetric monitor, Grid tied, produce about 600kw/hrs/mo. 12/2012: Added 10 Solarworld 255w panels and 10 Enphase mirco inverters.