So C/20 on two 100s is 40 amps? (NOPE!!!) Forget the 75 amper unless you get two more.
EDIT- C/20 is the 20 hr rate, so that is only 5 amps per 100AH!
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Looks like bite the bullet on the Gels. Toss them and get four AGMs or Flooded.
Note the DC amp draw for 120 is divide by 10, so:
Microwave- 1400w (input is higher than the watts name for output watts) so that is 140 amps. You only do that for a few minutes even with four batts.
Toaster- 900w pulls 90 amps.
TV/DVD 100w is 10 amps but then furnace comes on 10 more and you have 10 amps worth of lights on-- draw is now 30 amps so you can do that with the two Gels. But you left the laptop on! Now at 40 amps.
