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Canoness with Rosarius, Mantle, Evis: 135
Command Squad with Banner of the Order, Hospitaller: 115
Priest: 25
3x5 Battle Sisters with 2 Flamer: 210
2x9 Repentia: 282
3x2 Penitent Engines: 480
Void Shield Relay: 240 (2 Shields with 3 Charges and Fuel Pipe)
Total: 1487

The plan? Put one void shield near the middle of the table and the other near my deployment zone and have them protect my stuff and then I charge foward. I know I'm insane. That being said if a Penitent does make into combat while 12 within my Banner it will get 7 attacks on the charge.

I like the idea of 7 attacks on the charge

Having said that, your opponent can fit quite some firepower in 1500 points.
With no really tempting targets in your list, you'll probably find the penitents and repentia drawing a lot of firepower.
Also, because your only vehicles are the penitent engines, you'll probably find every anti-tank gun in the enemy army firing at them...
If, however, you keep all of them behind the shields, your opponent will probably shoot your scoring units first and then flank the rest behind the shield.
I think it'll only work if you can somehow force the enemy to close in on you without them getting the charge...

But then again this is said more from logic than actual experience playing sisters, and you seem to imply this isn't the most serious list
I'd say, try it and see what the results are!