Originally posted by Livin Large
View Post
Announcement
Collapse
No announcement yet.
Simple power display panel addon
Collapse
X
-
Originally posted by Country Campers View PostThe 44 amp draw could have been 50 amps on leg 1 and 6 amps on leg 2 which would provide the 44 amp reading. If you would have more than 50 amps on one leg it should trip a breaker.
BrianForum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.​
Neil Citro
2018 Reflection 28BH Pepwave
2019 F350 6.7L Long Bed Crew Cab
Comment
-
Originally posted by Country Campers View PostThe 44 amp draw could have been 50 amps on leg 1 and 6 amps on leg 2 which would provide the 44 amp reading. If you would have more than 50 amps on one leg it should trip a breaker.
Brian
Comment
-
Originally posted by Livin Large View Post
Interesting. Makes sense. I can't think of any other reason for it to display the way it does.
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
- Likes 1
Comment
-
OK. I've been thinking about this for a while on how the amperage could be correct on the display panel. Not an electrical engineer and my knowledge comes from Dad who worked for the power company.
In order for the 110v side of the circuit to work we all agree that the neutral must carry the current back to the transformer. Where it gets complicated is when we throw the out of phase circuit into the mix. Again for both legs to work properly we must all agree that the neutral is carrying the current back to the transformer to complete the circuit otherwise we just went to 220v as the neutral dropped out and the hot legs are doing all the work.
This is how I see the the power working.
Remember voltage and amperage in AC is RMS (this is the key) It is possible for the neutral circuit to be carrying opposing voltages from the 2 phases, likewise the 2 amperages are of opposing signs. RMS is the Root Mean Square of the DIFFERENCE. So leg 1 is carrying 10 amps at 0 on the hz clock and leg 2 is carrying -10 amps at 0 on the hz clock. The difference between these 2 is 20 amps at 0 on the clock. Is we look at 30 on the hz clock (1/2 way there), leg 1 is now at -10 amps and leg 2 is at 10 amps, again the difference is 20 amps. The meter is measuring the difference between the loads returning to the transformer.Joseph
Tow Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
Coach: 303RLS Delivered March 5, 2021
South of Houston Texas
Comment
-
Another way to think about it is that the currents are going back and forth out of phase. So when one leg flow in the neutral is going to the source, the other leg flow is coming form the source. Otherwise the neutral carrying both legs going to the source at the same time would have to be larger to carry the combined flow. Being out of phase by 180 degrees the peaks and valleys of the oscillating current cancel each other. Look at the combination as the difference of the absolute values. |10| - |-10| = 0 |40| - |-20| = 10Ted
2021 Reflection 310RLS
2020 F350 PS,CC,LB,SRW
Comment
-
My clamp meter died 2 years ago and I have not replaced it yet as I want one that does DC current also (I do automotive work and having DC is nice).
I really want to build a Male plug / female receptacle setup that will allow me to measure current on each leg and the neutral to confirm or change my thought on how the system is working.Joseph
Tow Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
Coach: 303RLS Delivered March 5, 2021
South of Houston Texas
Comment
-
You guys ready for another monkey wrench? I'm at another 50AMP campground. When I turned on the fireplace and electric space heater the meter went to 000 amps. So my thinking is this pedestal is correctly wired with the 2 poles out of phase but the last 50AMP pedestal at the other campground wasn't out of phase but still supplied 50 amps which is why it displayed 44 amps. Thoughts?
Comment
-
Back to one of my comments earlier. I wonder if the 50amp service you were plugged into was mis wired where both of the hot legs were on the same phase??? I doubt you were pulling more than 30 amps per leg unless you had every possible component in the RV running at full load, up to and including the converter.Joseph
Tow Vehicle: 2024 GMC K3500 Denali Ultimate Diesel
Coach: 303RLS Delivered March 5, 2021
South of Houston Texas
- Likes 1
Comment
Comment