ᐅ New Carport: Should I install two high-voltage outlets and size conduit for a future photovoltaic system?
Created on: 10 Feb 2021 08:10
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Nemo2002
Good morning everyone,
We built our single-family home with solid construction in 2017 and are generally very satisfied.
Our only regret is that we didn’t install a high-voltage cable to the outside at that time. Since we will be adding a carport right next to the utility room this summer, and the paving will be reopened, we want to use this opportunity to fix that and lay additional cables under the paving.
Here’s what we plan to do (at some point in the next few years), and I’d like to know what size cables or conduits would be sufficient:
1. Wallbox -> planned right next to the utility room, 11 kW capacity....the straight-line distance is about 2 m (6.5 feet) from the house wall, so I think dimensioning the cable for 10 m (33 feet) length would be safe...the electrician can always shorten it during installation.
2. High-voltage cable to the garden -> we are considering possibly setting up a garden sauna in the future. This cable would be much longer, about 40 m (131 feet), and the heaters have a power rating between 6.8 and 9 kW.
3. Photovoltaic system on the carport -> flat roof with about 36 m² (387 square feet) surface area (photovoltaic load up to 42 kg/m² (8.6 lb/ft²) is already accounted for in the structural design, metal carport). We want to lay at least the conduits under the paving in advance. Ideally, we would also lay the cables at this stage, but I think that depends heavily on the system used, right? I read in the forum that UV-resistant (flexible) plastic armored conduit in M32 size or preferably two would be ideal. Can these be pulled directly under the paving to the house entry point? Also, we plan to choose a system with a battery storage because of the wallbox, since charging will mostly happen overnight.
Is it possibly feasible to run cables for both the wallbox and the photovoltaic system through a shared conduit?
It would be ideal if we could route the cables through our multi-utility duct. One entry point is still free, but that depends on the opening in the paving...otherwise we would need a wall penetration.
I would really appreciate your advice on which cable sizes would be sensible here, so that we don’t regret missing something later on.
Thanks!
We built our single-family home with solid construction in 2017 and are generally very satisfied.
Our only regret is that we didn’t install a high-voltage cable to the outside at that time. Since we will be adding a carport right next to the utility room this summer, and the paving will be reopened, we want to use this opportunity to fix that and lay additional cables under the paving.
Here’s what we plan to do (at some point in the next few years), and I’d like to know what size cables or conduits would be sufficient:
1. Wallbox -> planned right next to the utility room, 11 kW capacity....the straight-line distance is about 2 m (6.5 feet) from the house wall, so I think dimensioning the cable for 10 m (33 feet) length would be safe...the electrician can always shorten it during installation.
2. High-voltage cable to the garden -> we are considering possibly setting up a garden sauna in the future. This cable would be much longer, about 40 m (131 feet), and the heaters have a power rating between 6.8 and 9 kW.
3. Photovoltaic system on the carport -> flat roof with about 36 m² (387 square feet) surface area (photovoltaic load up to 42 kg/m² (8.6 lb/ft²) is already accounted for in the structural design, metal carport). We want to lay at least the conduits under the paving in advance. Ideally, we would also lay the cables at this stage, but I think that depends heavily on the system used, right? I read in the forum that UV-resistant (flexible) plastic armored conduit in M32 size or preferably two would be ideal. Can these be pulled directly under the paving to the house entry point? Also, we plan to choose a system with a battery storage because of the wallbox, since charging will mostly happen overnight.
Is it possibly feasible to run cables for both the wallbox and the photovoltaic system through a shared conduit?
It would be ideal if we could route the cables through our multi-utility duct. One entry point is still free, but that depends on the opening in the paving...otherwise we would need a wall penetration.
I would really appreciate your advice on which cable sizes would be sensible here, so that we don’t regret missing something later on.
Thanks!
H
hampshire10 Feb 2021 10:4715cm (6 inches), so 150mm (6 inches), sorry.
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nordanney10 Feb 2021 11:12Nemo2002 schrieb:
Thank you, I think 4mm² (about 5 AWG) would really be the minimum and maybe to be on the safe side go up to 6mm² (about 9 AWG)...If you have a lot of money and are very cautious, then yes. For most 11kW charging units, a flexible cable with 6mm² (about 9 AWG) is already the maximum size that can actually be secured properly. 2.5mm² (about 13 AWG) is sufficient—just like in a kitchen for an 11kW stove/oven. 4mm² (about 11 AWG) is already a solid safety margin. 6mm² (about 9 AWG) is a waste of money.hanse987 schrieb:
Don’t forget the LAN cable for the wallbox.Is that really necessary? The box will be just one wall away from the router... I think Wi-Fi should work fine there. But what are actually the advantages of having the wallbox connected to the internet? For vehicle updates?
If the charging station has a Wi-Fi module and Wi-Fi is available at the location, that works as well. Since Wi-Fi distribution often has its quirks, I prefer Ethernet. When you are installing cables anyway, running Ethernet usually comes along easily.
I wouldn’t connect the charging station to the internet, only to the home network. You can access the charging status and statistics and make settings. Of course, this also depends on the type of charging station.
I wouldn’t connect the charging station to the internet, only to the home network. You can access the charging status and statistics and make settings. Of course, this also depends on the type of charging station.
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