Solar PV System Specification
Our PV Solar installation supplied by Solar Advanced Systems consists of the following components:
- 14 x Sungrid 215W Solar Panels
- SMA Sunny Boy 3000HF inverter
- Landis G 110+ Generation Meter
There are many questions that potential solar panel owners may want answers to. Hopefully these FAQs will cover many of the queries. The answers are based on our experience as well as generally available information on the internet. Unfortunately there are some solar installation companies that seem to peddle unsubstantiated information as facts and to use misleading statements that are untrue. Luckily the vast majority of solar panel installers are legitimate companies that do not use such tactics.
Some Frequently Asked Questions about Solar Power
Do solar panels generate only on sunny days?
No. PV Solar panels will generate on cloudy days and do not just need sun shining on them. However the amount of electricity generated on a cloudy day is a fraction of that generated in the sun. In the winter this can be as low as 5% of the amount for a sunny day. In the summer a cloudy day may generate as much as 10% and even on a day with mixed cloud and sunny spells you can get as much as 50% of the output of a clear sunny day.
If your electricity meter is going backwards and reading lower after installing solar panels check this video. You should inform your electricity supplier if your meter goes into reverse when solar panels generate electricity.
What output will my solar panels give?
The output of your solar panels will depend on a number of factors such as the direction they face, the angle of your roof, your location in the country and if they are affected by shading. The output is significantly higher during summer months and can be around 3x higher than the maximum during winter.
What is the maximum electricity my solar panels will generate?
For our panels which are virtually south facing in South East England the electricity output generated equates to around 7kWh per kWp per day. So for 3kWp of solar panels you would get a maximum of 21kWh of electricity on the best sunny day of the year. A sunny day during winter would only generate a maximum of 7kWh of solar electricity so you can see the difference that the longer days make. You can view a Month by Month comparison of UK solar panel electricity produced for 2011 onwards so you can compare how much electricity solar PV panels will produce for a south facing roof in the UK.
What direction should my solar panels face?
In the UK the best output from solar panels will be achieved if they are south facing. Directions other than due South will still generate electricity but not as much as an installation facing due South.
What is the difference in generation between sunny and cloudy days?
The amount of electricity generated on a cloudy day is a fraction of that generated on a sunny day. In the winter this can be as low as 5% of the amount for a sunny day. In the summer a cloudy day may generate as much as 10% and even on a day with mixed cloud and sunny spells you can get as much as 50% of the output of a clear sunny day.
How can I make the most of the electricity generated by my solar panels?
A member of MoneySavingExpert has created circuit diagrams for a device to monitor the output from PV Solar panels and to enable households to use the maximum output from their solar panels. You can view the information on Dave Fowler's website here
How can I check on my panels remotely?
Can I view data from my Sunny Boy inverter on my laptop?
How much will I get from the Feed in Tariff? (UK only)
What is the best position for my solar panels?
Where should my solar panel inverter be located?