Is Power Cheaper With 200A Service? - Electrical - Page 2 - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum Is Power cheaper with 200A Service?
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08-25-2008, 08:49 AM   #16
Electrician

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Quote:
 Originally Posted by ccarlisle Micromind: I understand. However my question was: for the same btu output, is it cheaper to run a 1000W heater via 120V or via 240V... Denver Dave: Yup; no difference in the cost of running a light bulb via 120V or 240V.
Quote:
 Originally Posted by micromind Suppose the baseboard heaters were 1000 watt. Either one would consume 1000 watts, and if operated for 1 hour would consume 1 kilowatthour regardless of voltage. The advantage the 240 volt unit has over the 120 one is the current is less, meaning smaller wile can be used. You pay for kilowatthours, not amps, thus the cost of operation is the same at either voltage. Rob
As Rob stated, you pay for kilowatthours. A kilowatthour is a kilowatthour, regardless of the voltage used to achieve it.

 08-25-2008, 09:17 AM #17 Member   Join Date: Jul 2008 Location: Huntsville, AL Posts: 109 Rewards Points: 81 there can be some savings for 220V vs 110V, Since the current is lower on 220V, the resistive heating losses in the wire are lower (Resistive heating is only based on current and resistance I^2 * R). So halving the current reduces your wire losses by a factor of 4. How significant of an effect is it? Take 10 circuits each pulling 20 amps of 110V (22000 watts). If each circuit is ~100' of 12 guage wire (.00187 ohms/ft) you lose roughly 748 watts (3.4% loss). Do the same thing with 10 circuits pulling 10amps of 220V (still 22000 watts) and you lose 187 watts (0.85% loss) All that aside, the OP was asking about 200 AMP vs 100 AMP service, not 220 V vs 110 V
08-26-2008, 05:08 PM   #18

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Quote:
 Originally Posted by daxinarian there can be some savings for 220V vs 110V, Since the current is lower on 220V, the resistive heating losses in the wire are lower (Resistive heating is only based on current and resistance I^2 * R). So halving the current reduces your wire losses by a factor of 4. How significant of an effect is it? Take 10 circuits each pulling 20 amps of 110V (22000 watts). If each circuit is ~100' of 12 gauge wire (.00187 ohms/ft) you lose roughly 748 watts (3.4% loss). Do the same thing with 10 circuits pulling 10amps of 220V (still 22000 watts) and you lose 187 watts (0.85% loss) All that aside, the OP was asking about 200 AMP vs 100 AMP service, not 220 V vs 110 V
Now that is a cool response!
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---pete

 08-26-2008, 10:24 PM #19 Member   Join Date: Jul 2008 Location: Pennsylvania, USA Posts: 272 Rewards Points: 250 Now we just need to know what is the OP's contractor's explanation of how his magic panel will save money on the electric bills. __________________ Willis
08-27-2008, 12:45 AM   #20
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So...... what did I end up doing as the OP?

I took the advise of daxinarian very seriously... if the electrician could not tell me the truth (electric bill cheaper with a 200a service panel), then what else and why should I trust him on anything else in full basement remodel/re-wire. I did not call him back!

But I DID upgrade to a 200a panel. Space in my old service (30 year old Murray) and code would have required a hefty sub-panel in the basement (had just one circuit, needed 2 more plus bathroom and plus a new laundry). So for an extra \$700 over the price of a sub-panel I had a new 20/40 200a service installed (total for new 200a service was \$1,600). I picked a few electricians who have a small company to do side jobs when they are not working for their big name (high dollar) outfit.

New service panel is in... no fireworks yet.

Good discussion all, and Thanks!!!

Dave in Denver

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