I have a new "grid tied" system of 27 panels of 230Watts each. Problem is that Nicaragua does not have "net metering" so I can't get the extra that I generate during the day back at night or during cloudy days.
Power goes off a lot where we live, and I have a small hotel on the beach, and when power goes out, especially at night, we have no backup except now I have a 6 battery system (105A 12V deep celled) that is hooked up to 3 of the 230W panels to charge them. How do I hook up the batteries to the main electric panel when power goes out, the "grid-tie" is useless even during the day if the power company is down. I could at least run lights in rooms and restaurant/bar/patio/bathrooms and a couple of fans with the "off grid" system, obviously not enough for air conditioning or pumps or refrigerators, etc.
If I could flip a switch and separate the grid tie to the main panel and tie in the battery bank to the system, turn off all the heavy load breakers and keep all the lights, etc. on, then I could stay in business.
If I could use both systems, charge the battery system when the grid tie is working and over producing.
If I added a couple more batteries I could do night time every night for lights and the minor stuff.
That is the problem with "grid tie" here in Nicaragua, you throw away all over produced energy and don't get rewarded by adding to the grid, and I only over produce from 10:30:am to 2:00PM anyway, so I'm having to use the corporate power companies energy in early morning and afternoon just to meet my load demands.
If at night I only had to use 30-50 11W bulbs and 5-10 45W fans for the rooms, I could do most of the night with battery power, especially at bed time later when I don't need the bar/restaurant lights on at all, just a few.
So do I need different breaker boxes for each system with switches between the two separating the heavy use loads from the battery use loads when the power goes out and I need alternate power from the batteries? 3000-4000 W would do me great during emergencies that happen weekly, just running the lights and necessities, the guests wouldn't know the difference.
Also was thinking the other day of buying some LED string lights to light up the bar/restaurant area's, hundreds of lights on strings that would also run off the batteries, would use very little power, my 6 batteries should easily handle that on a night to night basis and my 3 230W solar panels would do the charging during the day?
I've probably confused the hell out of you Kevin, but I'm desperate to get the most out of what I have here with little help to figure it out.