Discuss Solar PV System with or without a battery? in the Solar PV Forum | Solar Panels Forum area at ElectriciansForums.net

chris101

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Greetings, everyone,

After dedicating over a month to researching Solar PV systems, I'm nearly ready to make a decision. I owe my progress to some wonderful individuals who generously shared their time and solar expertise with me.

Currently, my inclination is towards a 7kWh optimized system. However, I'm grappling with the decision of whether to invest in a battery now or wait a few more years, as I have a budget of up to 3k for a battery.

My yearly energy consumption stands at 6000kWh, with daily averages of 12-13kWh in the summer and 20-25kWh in the winter.

My setup will include 16 panels, with 12 facing South (185 degrees) and 4 facing South West (247 degrees). Some of these panels will experience morning shading, but they're unobstructed from 10am to 6pm.

I'm curious about estimating my annual energy generation and export? During summer nights (midnight to 8am), our maximum grid import is 2.5kWh.

The bulk of our energy usage occurs on weekdays from 4pm to 9pm, and during weekends. I anticipate a significant increase in consumption during the winter due to our gas central heating and reluctantly using a tumble dryer from time to time.

Based on my understanding, if I export 75% of my generated power (likely via Octopus Flux), it might make more financial sense to delay the battery investment until I can afford a 13kWh+ battery.

One of the calculations shared with me suggests: "A 7kWh system should generate 7K kWh per annum conservatively. You will sell 75% of that for export at 22p via Flux = £1150 earned. Offset 25% of your consumption = £450 saved. Total = £1600 p.a."

Any suggestions and advice on this matter would be greatly appreciated.
 
Bear in mind if you get a company to install this then the battery would of course be vat free aswell.

Flux is an intersting tariff but also quite hard to model as you have 3 rates for import and 3 for export...

Dont be afraid to ask for revised quotes as I have seen on my own installs the price of panels has tumbled in a matter of months going from around 140 to 74 each!

Your profile says London but where abouts are you based as im sure somebody sensible on here will be able to help
 

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