Started by MountainDon, January 13, 2009, 02:18:39 AM
0 Members and 1 Guest are viewing this topic.
Quote from: CjAl on September 29, 2011, 11:02:02 AMI have been dreaming of being off grid for years. I was looking at some outback equpment a while back. Does anyone have links for the cheapest sources?Also what are your opinions on wether to buy it all assembled vs buying it seperatly and assembling it?I would like to not have to worry about the dual invertors and stick with 120v. I do alot of jeep building and use 220 in the shop but i guess i can run a generator for that. I have a friend imigrating from australia and im trying to get him to make enough room in his container to bring me a lister motor for running a generator.
Quote from: PorkChopsMmm on September 29, 2011, 10:00:33 AMThat theoretically works but I am up in zone 5 that sees lots of feet of snow. The snow won't melt or blow off if it is at a 63 degree angle. While you lose efficiency with the 85 degree tilt you can actually capture sun because your panels aren't covered in snow. I had to go brush down my panels a couple times a day when it was snowing last winter.
Quote from: Squirl on September 29, 2011, 04:36:50 PMWith hydro you would be surprised. Even if it is low output, it is constant. IIRC you are in Texas. So even if you put out a tiny 25 watts (2 cfl's) an hour that is .6 kilawatts a day 365 days a year. That is more than some solar systems on here.
Quote from: Native_NM on September 30, 2011, 01:23:29 AM. Based on the PNM plan terms, I calculated payback in 8 years.
Quote from: MountainDon on September 30, 2011, 08:13:54 PMLet me toss this into the mix. IMO, anyone planning an off grid system should go for a 24 VDC based system, unless it is a very small system. Twenty four volt systems can use smaller gauge wires. But to go with a 24 VDC battery bank you would need two of those modules in series, to get the voltage high enough to be able to charge 24 volts. And an MPPT charge controller is really the only way to go*.Also think hard and long as to what amount of power will be used in the future. I haven't totaled up the values but I do know we have electrical devices in our cabin that we never dreamed of in the year we planned our place. Because the battery bank was planned to be generously over sized we have no issues with running the extras. (More lighting including exterior, blender, electric can opener, electric mattress warmer and more.)* Lots of things to watch when planning. It's been covered here before, but the charge controller must be able to handle the highest voltage produced by the series panels PLUS a safety factor of 1.56. If the Voc of the two panels was 66.6 volts for example, the CC would need to be rated for a maximum voltage of no less than, 66.6 x 1.56 = 103.896 volts.
Quote from: AdironDoc on October 03, 2011, 12:18:24 PMOk, friends, I need a bit of advice on my solar setup. I've got two 200W 27V panels set up around 55 feet from the house. The way I see it, I have two choices. Build a small shed next to the panels and keep the MPPT charge controller, batteries and inverter there, then run line voltage 55ft to the house. That means building a shed, and, extending my inverter on/off switch wire to reach the house. Second possibility is run the MC4 connectors into 100ft extensions available at Sunelec. I asked the salesman if running 27V over 55-60ft is a better option given potential voltage losses. Salesman said, "why not?". Why not indeed. If that's not a problem, I could keep batteries, and all equipment in the basement meaning less expense and work. What do you guys see as the better option? Doc