Currently I am looking at a 400 amp Square D combo panel installed outside garage(flush mount) and then 4/0 Al feeder to a 200 amp sub panel on the other side of house (135' length). The combo panel (30 space, 40 circuit) seems like the simplest way to do this.

Another option is a Siemens 400 amp 4-space 4 circuit Levery Bypass meter base (with 2 - 200 amp breakers ?) on the outside with a 200 amp sub panel directly on the inside (connected by nipple to feed that panel) and then a 200 amp sub panel on the other end of the house. Would this work as well? The one advantage I could see is the breakers would be accessible inside the garage instead of outside. And maybe when hooking up solar- it might be easier as well??? I'm sure I will have to check with power company on this...Any comments/suggestions are welcome!

  • That panel is really a 30 space, 30 circuit. They're saying 10 of the spaces allow "double stuff" breakers. Which is useless because virtually every circuit nowadays requires AFCI, GFCI or both, and those are not available in double-stuff. A 30 is "nervously smallish" for a whole, modern house, and will force you into compromises. Given that the incremental cost of more spaces (up to 42) is a few lattés, there is no reason not to max it out. Unless you really, really, like lattés. Dual 30-spaces, on the other hand.... – Harper Dec 29 '18 at 20:58
  • So you're saying the 30 space, 30 circuit combo panel plus the 200 amp sub panel which will probably be 30 space, 42 circuit as well will not be large enough ? – Jim Dec 29 '18 at 21:49
  • 60 actual spaces will be just fine. I wasn't sure you had dual 30’s! Since you do, that is a great way to go. I am saying "X space, >X circuits" is a marketing lie, you will only be able to get X circuits in that. – Harper Dec 29 '18 at 22:09
  • Also mind which end of the house your loads are on, I see lots of ranches with kitchen laundry bathroom garage furnace waterheater A/C all at one end... 30 spaces will be too few at that end. – Harper Dec 29 '18 at 22:15
  • Can you provide the square footage of your house, as well as info about the HVAC system, and whether you are using gas or electric for the dryer, range, and hot water heater? – ThreePhaseEel Dec 30 '18 at 0:45

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