OK you are already making huge mistakes, making wrong assumptions, and wasting money.
First to do what you want requires no solar power what so ever because you already have commercial power. May not be reliable commercial power but a lot more reliable than solar and does not come with limitations. You can do exactly what you want with just rectifiers > batteries > inverter. In other words a dual conversion UPS. Ever hear of a UPS used in IT Data Centers? It will run circles around solar and a heck of a lot less expensive.
Secondly using a PWM controller and battery panels is a waste of money and energy. Battery panels cost about twice as much as grid tied panels. It take a 300 watt PWM system to generate what a 200 watt MPPT system using grid tied panels. A 300 watt PWM system cost roughly $700, and 200 watt MPPT system cost roughly $500.
So tap the breaks and rethink this because you are fixing to make a huge mistake going solar. FWIW anything you take off-grid will cost you roughly 10 times more for power the rest of your life vs buying it from the power company. Ihave no idea where you came up with it is cheaper to make your own power, but it is FALSE.
Just based on what little info you have provided of using 12 volt 200 AH batteries and a 700 watt inverter you can build a dual conversion UPS for less than $800 USD. All it takes is a 24 volt 75 amp rectifier, 24 volt 100 AH AGM battery, and a 700 watt inverter.
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Newbie from Philippines with a 300W setup
Just got my solar panels and other items I ordered and excited to set this up. I was expecting these to arrive on Monday but were instead delivered this morning.
Okey so what I have are:
3 units 100W solar panels, Pmax 100W, Vmp 17.4V, Imp 5.76 Voc 22.0V, Isc 6.06A, Max system voltage 600V
PSW (Pure Sine Wave) Inverter rated at 1000VA/700W - I thought 1000VA stands for 1000W as VxA = W
30A PWM charge controller
2 units 100Ah Motolite Solarmaster FLA, deep cycle batteries
Other things I already have:
1 unit 20ft 1x1-inch square tubes - cut in to 6 to secure the 3 units of solar panels via stainless bolts and nuts
1 unit 20ft 1x1-inch angle bar cut in half to secure the solar panels with the square tubes with stainless nuts and bolts and to the roof and secure with tex screws
20 meters #10 weather proof dual Royal cord
10 meters #8 automotive wires
battery lugs, nuts and bolts, volt panel meter (0V to 30V), ampere panel meter (0A to 50A), 30A circuit breakers
My objectives are:
1. To at least save a third or half of what I'm paying to the power company
2. To get rid of the nuisance of getting frequent brownouts especially during my work hours
Background:
I'm an online web developer/programmer with work hours at 7:00AM to 3:00PM. Having power interruptions can be quite a nuisance as some of my clients (although they didn't say it, I know) are stressed when I suddenly went offline because of unannounced power fluctuations.
I have an isolated work area converted from a store room with the wiring separated from the house wiring and ready to be energized by the solar power setup. I have a 2W LED light, a 65W electric fan, a desktop with a 700GB and 500GB harddrive with AMD Radeon 7500 video card, dual monitors AOC 2236V and Acer P241W, Intex 1500VA/900W UPS, generic 600VA/300W UPS, modem/WIFI router
My goal is to make my work area powered by the solar setup and make it power fluctuation free from 7:00AM to 4:00PM. After the 4:00PM period, I either reconnect my computer system to the mains or turn it off as the work hours is over. Then optionally/probably divert my solar setup to provide power to the lights only until the next day. The lights would be a total of 10Watts max from 6:00PM to 6:00AM and again transfer the lights to the mains after 6:00AM.
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