ᐅ Planning to install solar panels – options: 19 kW peak, 25 kW peak, 30 kW peak, battery storage?
Created on: 27 Mar 2022 09:28
O
Obermuh
Good morning everyone,
We are planning to install a photovoltaic system, and I have finally received a first offer. At the moment, everyone seems very busy, as out of three requested providers, only one responded after several weeks. Compared to the many threads here, the price seems a bit high, but this is somewhat offset by the fact that installation could theoretically still take place in April (depending on the module selection, see below).
I am aware of the basic discussion about whether or not to include a battery storage system. The offers I received all include storage systems for now.
Local conditions:
Flat roof with nearly 230 sqm (2,475 sq ft) of usable area, completely unshaded.
Previous year’s consumption: 12,800 kWh – 8,300 kWh measured by heat pump meter, 4,500 kWh household meter.
I recently got an electric car, and I expect an additional annual demand of around 4,000 kWh.
Expected yield: 900 kWh per kWp.
Offered options:
Available modules, same price with identical total output:
Hyundai HiE-S410VG (only available again from May)
Solarwatt Classic H1.1 Pure 375 (in stock with the provider)
Optional storage systems:
E3DC S10X 14 kWh
E3DC S10E Pro 19.5 kWh
Complete system offers (net):
19.68 kWp – €22,828
+ 14 kWh storage €13,250
Optional 19.5 kWh storage €18,630
24.6 kWp – €27,552
+ 14 kWh storage €13,250
Optional 19.5 kWh storage €18,630
According to the provider, 30 kWp could also be installed on the roof, but this would require a ripple control receiver. This option is available on request.
My questions:
- Are these offers still reasonable or overpriced?
- Does it make sense to choose the slightly “weaker” Solarwatt modules that are available now? Considering the current situation, is it better to have “a bird in the hand than two in the bush”?
- Is a battery storage system advisable given our relatively high consumption and low feed-in tariff? Mathematically probably not, but given the recent trends in the energy market, could it be a worthwhile investment for greater independence and peace of mind?
- Is it worth having a controllable wallbox (E3DC Connect)? It seems to be included in the offer but not separately priced. I already have a CEE32 socket in the garage and charge with a Juice Booster at up to 22 kW (missed out on the wallbox subsidy, so I got approval from the grid operator for 22 instead of 11 kW).
My reasoning: If I can achieve around 60% self-sufficiency with the storage, I would save €2,380 per year at the current electricity price of €0.31/kWh (31c/kWh). This means the “smaller” system with 19.68 kWp and 14 kWh of storage would pay for itself in 18 years, excluding feed-in and maintenance costs.
We are planning to install a photovoltaic system, and I have finally received a first offer. At the moment, everyone seems very busy, as out of three requested providers, only one responded after several weeks. Compared to the many threads here, the price seems a bit high, but this is somewhat offset by the fact that installation could theoretically still take place in April (depending on the module selection, see below).
I am aware of the basic discussion about whether or not to include a battery storage system. The offers I received all include storage systems for now.
Local conditions:
Flat roof with nearly 230 sqm (2,475 sq ft) of usable area, completely unshaded.
Previous year’s consumption: 12,800 kWh – 8,300 kWh measured by heat pump meter, 4,500 kWh household meter.
I recently got an electric car, and I expect an additional annual demand of around 4,000 kWh.
Expected yield: 900 kWh per kWp.
Offered options:
Available modules, same price with identical total output:
Hyundai HiE-S410VG (only available again from May)
Solarwatt Classic H1.1 Pure 375 (in stock with the provider)
Optional storage systems:
E3DC S10X 14 kWh
E3DC S10E Pro 19.5 kWh
Complete system offers (net):
19.68 kWp – €22,828
+ 14 kWh storage €13,250
Optional 19.5 kWh storage €18,630
24.6 kWp – €27,552
+ 14 kWh storage €13,250
Optional 19.5 kWh storage €18,630
According to the provider, 30 kWp could also be installed on the roof, but this would require a ripple control receiver. This option is available on request.
My questions:
- Are these offers still reasonable or overpriced?
- Does it make sense to choose the slightly “weaker” Solarwatt modules that are available now? Considering the current situation, is it better to have “a bird in the hand than two in the bush”?
- Is a battery storage system advisable given our relatively high consumption and low feed-in tariff? Mathematically probably not, but given the recent trends in the energy market, could it be a worthwhile investment for greater independence and peace of mind?
- Is it worth having a controllable wallbox (E3DC Connect)? It seems to be included in the offer but not separately priced. I already have a CEE32 socket in the garage and charge with a Juice Booster at up to 22 kW (missed out on the wallbox subsidy, so I got approval from the grid operator for 22 instead of 11 kW).
My reasoning: If I can achieve around 60% self-sufficiency with the storage, I would save €2,380 per year at the current electricity price of €0.31/kWh (31c/kWh). This means the “smaller” system with 19.68 kWp and 14 kWh of storage would pay for itself in 18 years, excluding feed-in and maintenance costs.
I would go ahead and use the available modules to get started right away. Also, aim for a system size just under 30 kWp with a battery storage.
Of course, in winter you won’t generate enough power for your heat pump. The roof also has a parapet, and the sun’s angle is very low in winter...
However, in summer you’ll have enough electricity, even at night. An electric car also makes a good case for having battery storage, so you can charge from the battery in the evening. And now you’re considering adding a pool to heat...
Unfortunately, I was limited to a 10 kWp system. Otherwise, I would have installed more right from the start.
Of course, in winter you won’t generate enough power for your heat pump. The roof also has a parapet, and the sun’s angle is very low in winter...
However, in summer you’ll have enough electricity, even at night. An electric car also makes a good case for having battery storage, so you can charge from the battery in the evening. And now you’re considering adding a pool to heat...
Unfortunately, I was limited to a 10 kWp system. Otherwise, I would have installed more right from the start.
Martial.white schrieb:
(The electricity consumption still sounds high for bathing 3-4 times a week, unless you fill the 700L (185 gallons) tub completely every time.)Yep. I also bathe that often, sometimes even more than 4 times a week, and our heat pump uses less than 3000 kWh. Smaller house, of course, but it’s hardly down to the bathing.
There is quite a lot included: KNX (switches with displays), automatic adjustment of shading throughout the day, a network with NAS plus 8 cameras, several TVs with Apple TV, HomePods, etc. However, all of this runs through a separate meter.
No mechanical ventilation with heat recovery; it is really just heating and hot water. The value may still include the heating-up phase since it was the first year of billing. I will address that separately. Regarding this topic, I will follow the general consensus: Put as much as possible on the roof, and install storage only for ideological reasons, not financial ones.
No mechanical ventilation with heat recovery; it is really just heating and hot water. The value may still include the heating-up phase since it was the first year of billing. I will address that separately. Regarding this topic, I will follow the general consensus: Put as much as possible on the roof, and install storage only for ideological reasons, not financial ones.
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