Solar Electricity AC Solutions.
Provide Electricity For Yor Property
This is a more complex solution than DC however you can use the electricity to power all your household appliances like fridges, freezers, TV etc. The first thing you need to do is to convert the output from the panel from DC to AC and this is done using an inverter. The other decision is whether to be off-grid or on-grid. For off-grid systems there is no connection to the power network so you will need to include batteries to store power for use when there is no daylight however these are expensive and will need to be replaced at least once withn the lifetime of the PV panels so are generally used where the cost of installing a connection to the mains network is uneconomic. In most cases the PV system is on-grid. This is where the output from the inverter is connected to your consumer unit alongside your existing mains supply and the self generated electricity is used in preference to that from the grid. If you are using more than you are generating then the balance is used from the grid however if you are generating more than you use then the surplus is sent back to the grid and purchased from you by your electricity company. In addition both the off-grid and on-grid systems are now elegible for the Clean Energy Cashback scheme (also known as a Feed-in tariff or FIT) wher you are paid for every kWh of electricity you generate, whether you use it or sell back to the grid.
How Much Will I Need To Power My Property?
The answer to this will be as individual as a property however a typical domestic system of about 1.5 to 2kWp will provide around 1/3 of the annual demand of a average family. As part of our survey we will calculate the potential annual output of the system and you will be able to compare this with your current annual usage (use your previous 4 electricity bills as a guide). As a rough guide you can typically expect to pay around £5000 to £5500 per installed kWp for a PV system i.e. a 2kWp system will be in the region of £10000 to £11000.
Dont forget to change your light bulbs to low energy ones - every little helps.
Inverters
An inverter is effectively a transformer in reverse (the transformer is the 'brick' that sits between the mains plug and your appliance such as a laptop or games console). It takes a DC input from the solar panel and converts it to a 240v AC output. This output is then connected directly to your consumer fuse box on its own dedicated circuit. The inverter selection is based on the output and number of PV panels and has to be matched carefully in order to allow the system to work most efficiently.
Off Grid Inverters
| Manufacturer and model | Peak output |
Battery voltage |
Price (exc VAT) |
|---|---|---|---|
| Schüco Inverter 500 | 500 W |
24v |
£278.82 |
| Schüco Inverter 1000 | 1000 W |
24v |
£461.12 |
| Schüco Inverter 1600 | 1600 W |
24v |
£779.27 |
On Grid Inverters
| Manufacturer and model | Peak output |
Price (exc VAT) |
|---|---|---|
| SMA Sunny Boy 1200 | 1200 W |
£590.52 |
| SMA Sunny Boy 1700 | 1700 W |
£764.24 |
| SMA Sunny Boy 2500 | 2500 W |
£1007.31 |
| SMA Sunny Boy 3000 | 3000 W |
£1093.82 |
| SMA Sunny Boy 3300 | 3300 W |
£1236.80 |
| SMA Sunny Boy 3800 | 3800 W |
£1272.54 |
| SMA Mini Central SMC4600 | 4600 W |
£1865.92 |
| SMA Mini Central SMC5000 | 5000 W |
£1865.92 |
| SMA Mini Central SMC6000 | 6000 W |
£1901.67 |
Also available is the Sunny Beam wireless table top unit which displays the actual current output, e dayover view and monthly overview (can wall mounted). £206.61 + VAT


