A lot of people are looking at solar, that may be with green credential or it could be the money saving motives. At RenewSolar we pride ourselves on our open options and wider ranging services over any run of the mill agency solar installer and seller. Why? because you needs are put first and we are flexible to meet those needs.
RenewSolar supplies hardware to solar installers as well off grid and Diyers, most of the kits we offer are tailored to those who have some known how to put the final touches. Here, this will be our first complete grid tied hybrid system offered as a complete installation.
This is difficult for us, there are so many variations from roof size to power requirements, so it is unlikely to meet everyone’s needs in one shot, but I think we will aim for a budget friendly system and try to keep our target return to just four years. lets see how that goes!
Before we dig into this, I will allow some options to make the system slightly more flexible, I may not mention these but we do like to leave in a solar upgrade path. perhaps I shall leave some ideas in the comments or over in the forum.
Step 1
For most homes and solar installations, they tend to be under the 3.6kw limit of a G98 application, but for most homes this can work, but I do not find it ideal. So I think we need to start with a G99 which is a pre application before you can install solar in your home. A 5kw inverter will meet most families needs around peak times.
Step 2
Generally families use around 15kwh of power a day and I think this is a good place to start running the math from.
Lets look at the summer and winter projections and requirements to make solar work for you.
1875wh-3750wh is required for the day to day power.
Step 3
Solar array we know need to offer 3750wh of power to meet the minimum requirements, so we can now pick the solar panels.
9 x 435w, I will round that to 10 so there can be two rows of solar panels on the roof.
‘you will need a roof 6 meters wide and 3.6 meters tall’
I have included the mounting systems for most standard roofs.
Step 4.
installation of a 15kwh battery. Due to the price point we are trying to match, this size is cost effective even if you use less power. What I am going to add is a Bus bar. Adding a bus bar in the installation make upgrading the system much more easier. it can be DIY, but I strongly suggest that you take advice on how to do this safely.
The cost.
£6022.00 Fully installed.
Here is the run down.
5Kw inverter
4.35Kw Solar array
15Kwh Battery.
installed and signed off.
Approximate installation duration 3 days
Thoughts.
I look at this package and I think that it is not overly priced for what you may be offered else where, but it is not what I could consider a budget option, the budget option needs to be half the price to be more cost effective. You have to remember that any solar installation should not be a compromise on the hardware and function, but there are certain areas where costs can be saved.
I think I shall vary the systems offered, but this is a pretty good option for most, so now the math.
Return Math.
For the return we often use 4 years as the target return time for any larger solar installation, this means that its a lot better than any other company, as they usually have a return of 10 years or more.
I am going to use 0.30kwh as the pricing, as we seem to float around this amount.
lets start with the battery, £1,638 per year – System ROI 3.66 years short and 4.86 years Short.
Short and long, What?
Long is a 365 day year, and Short is 275 day year. The solar year is 275 days.
Now the array. The solar array has a long average of £1,844.70 which amounts to 3.26 years.
I have not including charging, short falls, or energy trading into the math which may lower the time or rise the period to null. I would say with some confidence that 4 years target would be met, around 4.2 years.
Profits would be over the system life, you would be looking in excess of 10 years, and by year 15 you would see around a 20% performance drop from the system. Something may break, but we will say you’re lucky and work on ten years, and say the “profit” would be around £20,000.
From an investor perspective that would be a annual interest rate of 12.75% Thats around 3.64 times a bank average interest, solar is an attractive option.
Buying Step 5
If you would like to buy this installation and hardware, you can do so from the shop.
Check out the hardware available, we have every possible hardware combination (that works together) much of which is NOT listed on our shop. You can book a consultation and contact us via email for general questions or just comment below.
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