EPS
EPS
Hello,
Does anyone have any resources for what the various options are for EPS? I'd like to read up on it.
My hybrid inverter suggests that it can do some kind of EPS but the manual is a little lacking in the details.
Ideally I would have just a double 13A RCD socket behind a rotary AC isolator and manually switchover - but I am not sure if that is allowed.
Does anyone have any resources for what the various options are for EPS? I'd like to read up on it.
My hybrid inverter suggests that it can do some kind of EPS but the manual is a little lacking in the details.
Ideally I would have just a double 13A RCD socket behind a rotary AC isolator and manually switchover - but I am not sure if that is allowed.
Re: EPS
The setup you describe is perfectly fine, you just need to sort how the earthing and earth-neutral link work in both on and off grid mode. Easy to solve with a manual changeover switch.
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Re: EPS
Or just use it for devices which are doubled insulated so don't need (or even have) an earth like a table lamp or telephone charger. etc.
18.7kW PV > 109MWh generated
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5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
Re: EPS
I plan to use it for a freezer which I don't think is a class 2 device.
I've found the IET code of practice for such things and it looks like in my arrangements I cannot rely on the PME earth and there are some other regulations in BS7671 that apply - will talk to the sparky and installer about it who should have more manufactures details.
I've found the IET code of practice for such things and it looks like in my arrangements I cannot rely on the PME earth and there are some other regulations in BS7671 that apply - will talk to the sparky and installer about it who should have more manufactures details.
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Re: EPS
I think people here have always said that if you are going to run anything with the mains isolated you have to have a good alternative earth installed.Swwils wrote: ↑Thu May 12, 2022 9:09 am I plan to use it for a freezer which I don't think is a class 2 device.
I've found the IET code of practice for such things and it looks like in my arrangements I cannot rely on the PME earth and there are some other regulations in BS7671 that apply - will talk to the sparky and installer about it who should have more manufactures details.
2.0 kW/4.62 MWh pa in Ripples, 4.5 kWp W-facing pv, 9.5 kWh batt
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!
Re: EPS
Exactly! In the event of a power outage you cannot rely on the supplier's earth-neutral to provide protective earth. You can convert your house from TN-C-S to TT all the time, or you can run TN-C-S on mains power and TT when running in EPS mode. You also need to bridge the earth and neutral at the inverter when in EPS mode but not when running grid power (some inverters contain a contactor that does this for you). Additionally the brand new 18th Edition Amendment 2 (released a few weeks back) has made some changes that (I think) allow you to have your own earth spike in compliment to the supplier's PME earth, in which case you would be able to rely on your house's existing earth in the event of an outage.Swwils wrote: ↑Thu May 12, 2022 9:09 am I plan to use it for a freezer which I don't think is a class 2 device.
I've found the IET code of practice for such things and it looks like in my arrangements I cannot rely on the PME earth and there are some other regulations in BS7671 that apply - will talk to the sparky and installer about it who should have more manufactures details.
Long story short you need to find the sort of electrician who actually understands the fundamentals, the regs and how to apply them to non-standard situations. Most electricians like to spend their days working with bog standard stuff and are unwilling to apply thought or research to something else.
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
Re: EPS
Excellent, cos that what Nowty Towers uses.Stinsy wrote: ↑Thu May 12, 2022 9:53 am Additionally the brand new 18th Edition Amendment 2 (released a few weeks back) has made some changes that (I think) allow you to have your own earth spike in compliment to the supplier's PME earth, in which case you would be able to rely on your house's existing earth in the event of an outage.
I thought it was historically a no no with the DNO, although personally I could not see any downside to it.
18.7kW PV > 109MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 26MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
Ripple 6.6kW Wind + 4.5kW PV > 26MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
Re: EPS
I'm not an expert on "the regs", but it looks like earth rods have gone from "prohibited" to "required" in TN installations and that applies to all installations, not just us lot (who they now call "prosumers" and "PEIs"). Guidance Note 8 (to be published at the end of the month) will hopefully clarify.nowty wrote: ↑Thu May 12, 2022 1:47 pmExcellent, cos that what Nowty Towers uses.Stinsy wrote: ↑Thu May 12, 2022 9:53 am Additionally the brand new 18th Edition Amendment 2 (released a few weeks back) has made some changes that (I think) allow you to have your own earth spike in compliment to the supplier's PME earth, in which case you would be able to rely on your house's existing earth in the event of an outage.
I thought it was historically a no no with the DNO, although personally I could not see any downside to it.
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
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- Posts: 2025
- Joined: Wed Jun 02, 2021 6:10 pm
Re: EPS
Lucky man! How do we find these people?
More to the point, why isn't/wasn't extra earthing always a desirable thing in any circumstances? Can anyone imagine a situation when it could cause a problem?
When we get such dramatic about-turns it makes me suspect that the experts always knew what was needed, but were stitched up by people on committees who were only there to represent vested interests. The changes in building regs or fire safety approvals which lead up to the awful fire in Grenfell Tower are a case in point.
A
2.0 kW/4.62 MWh pa in Ripples, 4.5 kWp W-facing pv, 9.5 kWh batt
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!
30 solar thermal tubes, 2MWh pa in Stockport, plus Congleton and Kinlochbervie Hydros,
Most travel by bike, walking or bus/train. Veg, fruit - and Bees!