ᐅ Accept an offer for a 16 kWp photovoltaic system at this time?
Created on: 14 Dec 2022 20:27
P
Pitiglianio
I need your opinion on the following offer for a photovoltaic system.
Gable roof with a 23-degree pitch, fully covered on both sides with a total of 40 modules, approximately 16-17 kWp, depending on the modules available at that time.
Southwest orientation, no shading.
No battery storage.
Includes all installation work, scaffolding, connection, and registration: 28,000 net.
House details: Single-family home, 135 sqm (1,452 sq ft), KfW 55 standard, air-to-water heat pump, controlled ventilation system, 3 occupants, aquarium, possible electric car in 2 years. Estimated annual electricity consumption: 8,000 kWh.
Gable roof with a 23-degree pitch, fully covered on both sides with a total of 40 modules, approximately 16-17 kWp, depending on the modules available at that time.
Southwest orientation, no shading.
No battery storage.
Includes all installation work, scaffolding, connection, and registration: 28,000 net.
House details: Single-family home, 135 sqm (1,452 sq ft), KfW 55 standard, air-to-water heat pump, controlled ventilation system, 3 occupants, aquarium, possible electric car in 2 years. Estimated annual electricity consumption: 8,000 kWh.
P
Pitiglianio15 Dec 2022 11:47@face26 Thanks in advance for the preliminary calculations.
There are positive Google reviews too, if those are even relevant.
But just asking plainly... what can they do better or worse compared to other solar installers?
face26 schrieb:So far, I have only contacted the solar installer by phone and email.
If you have a good feeling about them and maybe a few solid references, then why not.
There are positive Google reviews too, if those are even relevant.
But just asking plainly... what can they do better or worse compared to other solar installers?
Pitiglianio schrieb:
But just to ask bluntly... what can this installer do better or worse than other solar installers? :p Like with any trade, when you compare two tradespeople – pretty much everything 😎
- Price increases up to the execution phase
- No fixed total price after all
- Poor or incorrect installation, eventually water will get under the roof tiles
….
You can go on endlessly with examples, from minor issues to major ones, just like in all trades.
M
Marvinius22 Dec 2022 23:46face26 schrieb:
What does PVGIS say about what to expect?
Calculate roughly, for example:
17 kW x 1000 kWh/year (according to PVGIS) x 0.075 (approximate feed-in tariff) x 20 years (estimated service life) =
25,500
That’s what you get with full feed-in. Assuming you reach that output even at full capacity. This means you are slightly in the negative.
You will then recoup the effect through self-consumption. With an air-to-water heat pump and electric car, you will most likely end up with a positive balance in the end.
If everything is really included, it’s certainly not a bargain, but prices are simply what they are. If you look through offers in other forums, many are currently even significantly more expensive.
Comparing with an offer for something three times as large doesn’t make sense.
Prices also vary a lot by region.
Do you have other offers? What are their prices? But the heat pump runs especially in winter, when there is no photovoltaic power available for self-consumption. From about November to February...
KingJulien23 Dec 2022 02:19Marvinius schrieb:
But the heat pump mainly runs in winter, when there is no photovoltaic electricity for self-consumption. So from November to February... Do you live near the Arctic Circle?
In Germany, it’s not “eternal night” in winter either.
K
karl.jonas23 Dec 2022 15:09Marvinius schrieb:
But the heat pump mainly runs during winter I just did a quick and rough calculation (please feel free to correct me):
- Heat demand 6000 kWh/year / 2.8 = electricity consumption 2143 kWh/year
- 2143 / 150 days = 14 kWh/day
- My December output 378 kWh / 23 days = 16.4 kWh/day roughly fits, but
- 16.4 kWh / 40 kWp (my system) * 17 kWp (your system) = 7 kWh/day
so additional electricity purchase is still necessary.
KingJulien23 Dec 2022 15:55The PV system is already at full capacity, so no additional panels can be added.
And anything less than 100% self-sufficiency is pointless? 🙄
Every kWh generated by the roof means you don’t have to buy expensive electricity.
And anything less than 100% self-sufficiency is pointless? 🙄
Every kWh generated by the roof means you don’t have to buy expensive electricity.
Similar topics