Ecoflow delta 2 power station problem

[wildebus]

Eco flow has a built-in charger so it resets to polarity that mains charging cable is plugged into IE uk or Europe ..

UK or Europe? Europe doesn't have an AC system with a different polarity to the UK! it is just it is more likely for the wiring to be WRONG.

Sounds to me that the Ecoflow has a poor design that it will flip flop potentially and you won't know what is going on!
Take the Victron Multiplus I mentioned earlier ... If you are feeding that with a reversed polarity supply, the output will be reversed polarity, as it is passing through the supply - and if need be supplementing it from the battery via the Inverter.
But if there is NO AC supply in, it will revert to the correct polarity (even whilst in use).
THAT is the kind of function you want and is safe, not some "finger in the air" guessing what polarity the output is will be on an inverter.

 

[molly 2]

I can't really see where you a going on this thread so I'm out

 

[Geek]

The "reverse polarity" thing is a bit of a misunderstanding.

A 230v / 240v AC mains supply is supplied down two wires. The voltage is between them. In the UK, at least, one of the wires is labelled "neutral" and is supplied at more or less the potential of the ground, with the phase (or live) wire at plus or minus that voltage in a sine wave. This means that in theory, you could get a 240v shock if you touch a live wire when elecrically connected to the structure of the building.

From an inverter, however, there is no "more or less the potential of the ground" connection to pin the neutral to, so the voltages from live or neutral to ground are pretty arbritrary, though there should be around 230 volts between them. This means that you could* touch the "live" wire (or the "neutral" wire) (but not both) and not get a shock.

The mere concept of "reverse polarity" makes no sense for an inverter or generator in a motorhome. Any alert that this is a problem is simply a manifestation of the stupidity of the tester.

Earth is something else. Again, the mains supply will have its own earth. For a domestic setup, this will usually (but not always) be supplied from the substation, nowadays generally connected to the neutral line.

For a hookup point, the earth should not be connected to the mains-supplied earth wire, but instead it should be connected to an earth spike connected to the actual earth. Electricians call this TT (short for the french phrase).

A generator or invertor supply will probably have the earth connected to the chassis of the vehicle, but it's not likely to have the neutral wire connected to the chassis as well: it's safer as a floating voltage.

*Not reommended, though!

 

[trevskoda]

The "reverse polarity" thing is a bit of a misunderstanding.

A 230v / 240v AC mains supply is supplied down two wires. The voltage is between them. In the UK, at least, one of the wires is labelled "neutral" and is supplied at more or less the potential of the ground, with the phase (or live) wire at plus or minus that voltage in a sine wave. This means that in theory, you could get a 240v shock if you touch a live wire when elecrically connected to the structure of the building.

From an inverter, however, there is no "more or less the potential of the ground" connection to pin the neutral to, so the voltages from live or neutral to ground are pretty arbritrary, though there should be around 230 volts between them. This means that you could* touch the "live" wire (or the "neutral" wire) (but not both) and not get a shock.

The mere concept of "reverse polarity" makes no sense for an inverter or generator in a motorhome. Any alert that this is a problem is simply a manifestation of the stupidity of the tester.

Earth is something else. Again, the mains supply will have its own earth. For a domestic setup, this will usually (but not always) be supplied from the substation, nowadays generally connected to the neutral line.

For a hookup point, the earth should not be connected to the mains-supplied earth wire, but instead it should be connected to an earth spike connected to the actual earth. Electricians call this TT (short for the french phrase).

A generator or invertor supply will probably have the earth connected to the chassis of the vehicle, but it's not likely to have the neutral wire connected to the chassis as well: it's safer as a floating voltage.

*Not reommended, though!

All ok but just a we point, the ac is only supplied down one wire the live, neg is the same as an earth and dead to all extents, other wise a good post.

 

[Okta]

All ok but just a we point, the ac is only supplied down one wire the live, neg is the same as an earth and dead to all extents, other wise a good post.

But that is not necessarily true of an inverter supply where the AC can be supplied by both of the wires.

 

[mariesnowgoose]

I kinda like old-fashioned gas most of the time... (heresy!)

 

[Geek]

All ok but just a we point, the ac is only supplied down one wire the live, neg is the same as an earth and dead to all extents,

That's what I wrote isn't it?

It's distributed in three phases with no neutral. Only separated to single phase 240v at the substation (or sometimes on a pole transformer). At that point the neutral appears and is (meant to be) tied to earth potential. But that's earth potential *at the substation*.

It can be way off earth at the "customer premises", which is why they usually also supply earth. You're meant to apply that earth to your premises, using PME to bring the building to the mains supply potential, rather than the earth outside.

This has implications for electric lawnmowers, motorhome hookups and EV chargers, which cannot be inside the PME cage.

You can't use the TNS or TNCS earth for a hookup supply in case someone steps out of the door and gets a shock when their foot touches a muddy patch.

For the same reason, the neutral side might be at a dangerous potential in a motorhome.

And that's why "reverse polarity" is nonsense. You have to assume that neither "polarity" is at local earth potential, yet the motorhome bodywork should be at local earth potential because of TT earthing.