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.
D
Deliverer28 Mar 2022 20:27Pitiglianio schrieb:
... if I get a hybrid inverter, can I simply install a ... storage unit in a few years without any issues, ...?? The chances that it will still be compatible after a few years are low. Here, the usual 3-year upgrade cycles apply, after which the software is no longer supported. That would be too easy... ;-)
When they finally become really affordable, I think it's simpler to just connect them on the AC side.
M
Martial.white28 Mar 2022 21:34I would still go for the inverter with a DC output; it probably doesn’t cost much more. You can’t really lose by choosing that.
I hope that in 3 years I’ll be able to connect my battery storage system with four wheels to the house... but I fear it will take more like 30 than 3 years...
I hope that in 3 years I’ll be able to connect my battery storage system with four wheels to the house... but I fear it will take more like 30 than 3 years...
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Pitiglianio28 Mar 2022 21:46Martial.white schrieb:
I would still go for the heat pump with a DC output; it probably doesn’t cost much more. You really have nothing to lose.That would be nice. The offer from a solar installer demands a 1,000 (one thousand) extra charge for the hybrid system.P
Pitiglianio28 Mar 2022 21:48Deliverer schrieb:
If they are really cheap, just connect on the AC side, I think that's simpler.Is it really that simple? Why use a hybrid inverter at all then?
P
Peter Pohlmann28 Mar 2022 22:03This is not that simple, of course. Both the storage systems in cars and those for photovoltaic (PV) systems all operate with DC.
The hybrid system controls the storage charging and feeds DC from the roof into the DC storage unit. It also performs the conversion to AC and supplies the house network. The hybrid essentially has only one function: controlling and communicating with the battery management system of the storage.
Bidirectional charging, meaning using the electric vehicle as storage, is already possible. With VW, it should be available starting from 01/2022. Otherwise, the Ioniq 5 or the Nissan Leaf can be used. This is actually not a bad concept. It will probably take another two years, but it will come somehow.
The hybrid system controls the storage charging and feeds DC from the roof into the DC storage unit. It also performs the conversion to AC and supplies the house network. The hybrid essentially has only one function: controlling and communicating with the battery management system of the storage.
Bidirectional charging, meaning using the electric vehicle as storage, is already possible. With VW, it should be available starting from 01/2022. Otherwise, the Ioniq 5 or the Nissan Leaf can be used. This is actually not a bad concept. It will probably take another two years, but it will come somehow.
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