First, you need to know your solar insolation.  Or, how many hours of "full sun" you get.  This is not just "how long it's light out".  This table can get you close if you are in the US:
http://www.solar4power.com/solar-power-insolation-window.html

If you want to be able to always recharge, even in winter, go with the smallest number.

Then you need to know how many amp-hours you are going to remove from the batteries each day.  You know how much wattage you are going to run, but how many watt-hours?  How long will you be running 1200-1500W?  How long at 600W?

Also need to know the voltage of the battery bank, as that factors into converting between amp-hours and watt-hours.  (I'm assuming here you mean your battery bank is 1000 amp-hours.  Amps are just an instantaneous measurement, amp-hours is a capacity.)

So, for an example, I'll makes some assumptions:

Insolation:  Mine is 4.98 hours.
Battery bank: 48V / 1000AH
Usage: 6 hrs @ 1500W, 12 hrs @ 600W (the true values here could make a huge difference)

So, from that:
Total usage: 6 hrs x 1500W = 9000Wh, 12 hrs x 600W = 7200Wh, total = 16,200 Wh per day.

Battery bank capacity: 48V x 1000AH = 48,000 Wh

So you would be using 16,200 / 48,000 = 0.3375 or about 34% of the bank capacity per day.  Not a needed number for the panels, but does tell you you won't really have much reserve capacity - two days without sun and you're below 50% discharge.  Lead-acid batteries really don't like being taken below 50%, their life can be significantly shortened if it happens very often.

Required solar capacity: 16,200Wh / 4.98 hours insolation = 3,253W of solar panels.

NOTE that this does NOT account for system inefficiencies!  (Inverter losses, battery charging/discharging incurs losses, charge controllers can have a little loss, so forth...)  Different people factor in different amounts, up to 50%, for that.  If you are off-grid and rely on this solely, you probably want to do that too!  Which makes it 6,500W of solar panels.  (Personally, I didn't use this heavy of a factor for my own system, but then mine is completely non-critical - my house is on the grid - and nowhere near this big!)

So divide by the panel ratings and you get somewhere between 18 and 36 180W panels.  Lean toward the middle or high side, 18 really isn't going to cut it.  (You are rarely if ever going to get the full wattage rating of a panel, due to the way they are rated.  Better manufacturers will tell you the "real" rating in their data sheets, look for the "PTC" rating instead of the "STC" rating.)

Again, there are areas where this calculation can change radically.  Odds are you will have a different solar insolation.  You may not use as much power as I figured, or you may use more.  Hopefully you aren't intending to run a lower voltage battery bank, the currents are going to get enormous!

You basically told us you car has a 20 gallon gas tank, gets 30MPG highway, and 20MPG city.
Then asked how many gallons of gas you need a day to buy.
We need to know how far you drive!

I am not sure what changed, but your earlier figure of 27 amps "with everything on" is only <400W, or a 24/7 max of 650AH per day at 12V.
That would be 16 panels with 4 hours of solar insolation.
Hopefully Everything is not on 24/7.

Pure guessing?

A 10 year old 10A Schumacker charger would average about 6A into the batteries?  Less than 6A with my Schumacker, which is a 25 year old 20A.
And 6 hours a day = 36 amp-hours.  6 amps x 6 hours = 36 AH per day from the generator.

That would imply you need 36AH per day, plus 10~20% fudge factor.  About 42AH per day.
A single 180W panel would be pretty close to covering that.

A 180W panel will make about 10A.  Maybe 11A.
And a 4 hour solar insolation means 10A x 4 hours = 44AH per day, per panel.

Winter will most probably be less than 4 hours of insolation per day, worst case.
Mine is about the worst in the lower 48 at 0.5 hours, but guessing a 180W panel would cover me for 8~9 months per year.

One more thing to consider.
Those 120~150W panels look pretty cheap... by the Watt.
BUT.  
If you only need 1 or 2 or 6, it is usually Cheaper to buy smaller panels.
The large panels must be shipped on skids, and it can cost a few hundred dollars to ship ONE panel.
I find UPS is cheaper for less than about a half-full skid of panels.
And I was charged an additional $100 to deliver a (1/4 full?) skid of panels to a "residential address without a shipping dock"(?).
A couple Big panels do not look so cheap with freight charges.