help me for how much power do I need

Based on your available information, I'd make a few guesses about your daily consumption.  I'll do the math here, so when you come up with more accurate numbers you can replace what I put in with your own real-world values.

Refrigerator 360 liters, ~12 cubic feet.  This would be a small refrigerator in America, I'd guess consuming around 900 watthours per day. (0.9kwh)

Big screen TV 250 watts X 3 hours of watching = 750 watthours (0.75kwh)

60 watt lights X 3 bulbs X 5 hours of light = 900 watthours (0.9 kwh)

Let's throw in an extra 500 watthours just for miscelaneous things you didn't think about, IE: your computer, stereo, electric can opener.

So Frig+TV+Lights+Misc= 900+750+900+500= 3050 watthours or ~3kwh.

For long battery life, you'll want to use no more than 15-20% of your battery bank per day, so 3000/0.15=20,000 watt hours.

A trojan L16 battery has an 420 amphour capacity.  To get ~ 20,000 watthours of capacity you need 8 of those, wired in series for 48V to get 420amphour X 48VDC= 20,160 watthours.  Note that amps X volts = watts, so 20160 ampvolt hours = 20160 watthours.

Now, charging a battery that needs 3000watthours per day.
You don't want to charge the battery at less than 1/12 its capacity, or greater than 1/8 its capacity.
For a 20160wh battery, that's 20160/12= 1680watts to 20160/8= 2520watts

Winter gives the fewest sun hours, let's assume it's 3SH?  If you bought 6-300watt panels, you'd produce 1800 watts at noon, or about 1800watts X 3SH = 5400 watthours of power.  That is enough to recharge your batteries completely, assuming you have completely cloud free weather all winter long (how likely is that?)  Suppose there's two days of cloudy weather before there's a sunny day to charge the batteries?  You'd need 3000 watthours X 2 days = 6000 watthours total, plus the electricity you use on day 3, which will total up 9000 watt hours.  You're better off going with 2400-2500 watts of panels to cover the cloudy days you're pretty much guarantied to experience.  Assuming you never get better than 85-90% efficency from your panels, bump the wattage up to 2700.

Here's what I suggest you buy.
9 300 watt grid-tie panels (1600-2300$)
8 Trojan L16 batteries (~3000$)
60 amp or greater charge controller (I have a midnight 200 classic) (650$)
>2000 watt sine-wave 48VDC inverter (I'd suggest Schnider's SW4048 (1750$)
power panel, wiring, breakes, ect 600$

Total >8000$US
Is this a digestable number to you?  This is what I'd say is realistic.  Try to cut corners off of these numbers, and you most likely will end up with disappointment and ruined batteries.