ᐅ Limit the photovoltaic system to 70% capacity and install a remote control receiver for load management.
Created on: 7 Oct 2014 13:13
D
Doc.Schnaggls
Hello,
Our photovoltaic system is planned to be installed on our roof, which will hopefully be ready, at the same time as the house construction in about 2 weeks.
We are currently a bit unsure about what makes more sense:
1. Limiting the system to 70% of its maximum capacity, or
2. Installing a remote control receiver that allows the utility company to control the system remotely.
How and why did you handle this with your photovoltaic systems?
We have an almost perfect south-facing orientation without shading, and our system will have a maximum output of 4.25 kWp.
Is it correct that if the utility company turns off the system, they still have to pay compensation?
Best regards,
Dirk
Our photovoltaic system is planned to be installed on our roof, which will hopefully be ready, at the same time as the house construction in about 2 weeks.
We are currently a bit unsure about what makes more sense:
1. Limiting the system to 70% of its maximum capacity, or
2. Installing a remote control receiver that allows the utility company to control the system remotely.
How and why did you handle this with your photovoltaic systems?
We have an almost perfect south-facing orientation without shading, and our system will have a maximum output of 4.25 kWp.
Is it correct that if the utility company turns off the system, they still have to pay compensation?
Best regards,
Dirk
We are getting a 4.6 kWp system, also with 70% hard regulation. Does the 300 euro fee remain the same for you? You will have only a few days a year when your system actually exceeds the limit... it really isn’t cost-effective. So, 70% soft regulation would be a better solution.
We have a 7.28 kWp system facing due south with a 25° roof pitch. We have limited it to 70%, but with the option to first deduct self-consumption before applying the 70% limit. So, if the system would normally be throttled to 5.3 kW, but we are currently using 2000 W, then no throttling occurs at all.
Additional costs include a larger inverter (ours is 7.5 kW) and the Solarlog, which we would have purchased anyway, plus an S0 meter that cost 40 euros and still serves well. With the S0 meter and Solarlog, we can now see exactly how much electricity is consumed minute by minute and view daily profiles, which has already helped identify some major energy wasters. There is also a lot of useful information (self-consumption share, graphs, daily production).
Conclusion after one year: Hard limiting at 70% causes losses (mainly psychological rather than financial), but at 80% there are no losses. So I would choose the next inverter to cover 80% of the installed capacity; ours is slightly oversized. A 6 kW inverter would have been sufficient since we only exceed 6 kW when it’s cold but sunny, usually in spring.
On the other hand, I wouldn’t want to do without the Solarlog and S0 meter. So: a soft 70% rule!
Additional costs include a larger inverter (ours is 7.5 kW) and the Solarlog, which we would have purchased anyway, plus an S0 meter that cost 40 euros and still serves well. With the S0 meter and Solarlog, we can now see exactly how much electricity is consumed minute by minute and view daily profiles, which has already helped identify some major energy wasters. There is also a lot of useful information (self-consumption share, graphs, daily production).
Conclusion after one year: Hard limiting at 70% causes losses (mainly psychological rather than financial), but at 80% there are no losses. So I would choose the next inverter to cover 80% of the installed capacity; ours is slightly oversized. A 6 kW inverter would have been sufficient since we only exceed 6 kW when it’s cold but sunny, usually in spring.
On the other hand, I wouldn’t want to do without the Solarlog and S0 meter. So: a soft 70% rule!
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