ᐅ Electrical planning: What can be done more cost-effectively?

Hello

we have received the electrical plan and quote from the electrician.

Garage: A 5x6mm² cable will be installed to supply power to the garage and garden, connected to a small sub-distribution board:

Surface-mounted sub-distribution board with 12 poles IP55
1x 40A 4-pole RCD (probably for the wallbox)
6x B16 1-pole circuit breakers (for everything else)

The following will be connected in the garage and garden:
Wallbox (probably 11kW)
Garage door
Lighting in the garage
Sockets in the garage
Sockets in the garden for the robotic lawn mower and possibly some lights

500€ for the sub-distribution board and cable seems reasonable, right?

That should be sufficient, correct?

For the satellite dish, the electrician wants 1600€ including installation, multiswitch, and Quattro LNB (in my opinion, the material cost is way too high, max 300€)

What size conduit should we prepare for 4 satellite cables so that we can install the satellite dish ourselves later? The roof tile mount for the satellite dish is already installed.
Is an M32 conduit sufficient for 4 satellite cables?

What preparations should we make for the photovoltaic system? Is an M40 conduit enough?

AlexKayn schrieb:

What preparation should we make for the photovoltaic system? Is an M40 conduit enough?

Are you planning to use a single string/array? Often, no more than 20 or 25 modules go on one string. For us, a second string wouldn’t have fit in an M32 conduit. I would prefer 2x M32 conduits rather than one M40… don’t forget that you also need a 16 mm² (0.025 in²) grounding cable.

AlexKayn schrieb:

The electrician wants 1600€ for the satellite dish installation, including the multiswitch and Quattro LNB (in my opinion, the material cost is way too high, max 300€)

Back in 2020, our electrician quoted about 1400€ for this. Considering inflation and other factors, the current price seems to be within the usual market range from my perspective. However, you shouldn’t forget that a satellite system isn’t just a quick job. You’re paying for his labor time and warranty. If something doesn’t work as expected, he’s responsible for fixing it.

(I actually handled this part myself on our house. But you really need to know what you’re doing, for example with the proper and standard-compliant installation of the equipotential bonding. It’s definitely not comparable to “just connecting a Blu-ray player.”)

Cutting corners on electrical work usually catches up with you over the years.

Run the four satellite cables including the equipotential bonding straight to the roof.

A reasonable dish, with a roof mount, LNB, multiswitch, and cable will already cost around 500 euros. 1300 euros including installation and cable routing is quite realistic.

You can probably get the materials for 300 euros, but if you want to assemble something like that on the roof, it shouldn’t be by anyone who has to provide a warranty on it.

Installation materials cost 500 euros but only delivered.

In my opinion, this is all saving in the wrong place.

Some people really believe that tradespeople work for free, that training is free, and that a satellite meter costs nothing...

I forgot to mention that the mounting bracket including grounding for the satellite system is already available (or will be installed by the builder).

The electrician’s scope of work:
Satellite dish 85cm (33 inches) Technisat, Quattro LNB, multiswitch, and the 4 cables (material cost really only 300€) but if the price is market standard, that’s fine with us.
The Technisat dish is probably fine, right?

Unfortunately, we cannot do the entire installation ourselves with a pitched roof.

Photovoltaics:
The electrician told us that we can fit a maximum of 2 strings on the roof (5-8 kWp).
For 2 strings, the M40 conduit with pull wire would be completely sufficient, he says. Is that correct?
Roof orientation South/West and North/East.

AlexKayn schrieb:

The electrician told us that we can have a maximum of 2 strings on the roof (5-8 kWp).
He says an M40 conduit with pull wire is completely sufficient for 2 strings. Is that correct?
Roof orientation south/west and north/east

Gable roof. You will need two strings to cover everything. If you already have the equipotential bonding from the satellite antenna and can share it for the photovoltaic system, that should be enough. If the conduit has more than two 90° bends, I would recommend spending about 100 euros to install 6x4 mm² (6x12 AWG) cable directly, running it from the junction box out to the roof. In any case, make sure the conduit is installed in a sleeve extending beyond the roofing surface. Our electrician had it only placed up to the roof surface, and we had to ask the roofer to extend it above the roofing.