Not Another Solar Quote Thread

893 Posts


Can someone just sense check this for me please. Batteries are Pylontech 3000C, reputable local installer, scaffolding all included (Jan install date potentially) all registered/accredited etc, I'm about to reply and say yes please.
Description of Goods Qty Unit Price Total Price
10 X JA Solar 385W Panels 1 £1,800.00 £1,800.00
Lux Hybrid 3.6k Inverter 1 £1,550.00 £1,550.00
Cable and Sundries 1 £255.00 £255.00
7.1kWh Battery Storage including long leads. 1 £2,750.00 £2,750.00
Roof Mounting Kit 1 £500.00 £500.00
Wi-Fi dongle for cloud access 1 £0.00 £0.00
Description of Services Qty Unit Price Total Price
Installation and Setup 1 £1,745.00 £1,745.00
Bird Protection + Installation 1 £450.00 £450.00
MCS + Part P Certification 1 £495.00 £495.00
Free Site Survey prior to installation 1 £0.00 £0.00
Free Online Monitoring 1 £0.00 £0.00
Goods & Services Sub Total: £9,545.00
VAT @ 0%: £0.00
Total: £9,545.00
0
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Replies
If you total everything up (minus batteries and bird netting), you are paying £6350 for a "budget" 3.85kW Chinese system.
For perspective, you can get:
10 X 400W Sharp Panels
10 X SolarEdge Optimizers
1 X SolarEdge Inverter
£5750 installed. 25 year warranty on everything. Better components, lower price, far superior warranty.
I would not proceed with the above quote if I were you - reach out to other installers - you can do better.
- 40% of panels in an East/ West rooftop orientation.
- Viessmann 200-W on Advanced Weather Comp. (the most efficient gas boiler sold)
Solar PV 5.25kWp SW facing (14 x 375 Longi) Lux 3.6kw hybrid inverter and 4.8kw Pylontech battery storage installed March 22
Octopus Flux electric and Tracker gas
3.85kW array and 7.1kWh battery is too heavily battery weighted for me. Most of the year you'll struggle to fill the battery unless you've got very low use. And if you've got low use them the battery isn't going to pay for itself.
If you can, see if you can go for a larger solar array. Either significantly bigger at 6 or 8kW or just adding more panels to the current system.
it's common to have more panels than your inverter can convert. In perfect conditions you miss out on a bit of power but I'm the rest of the 99% of the time you get the benefit of a larger array. You could go up to 12 or 13 before it would be an issue I believe.
I have lux inverters as do a few regular users, no issues that i know of so far.
I would agree with Mr. Brass though, if your roof will physically take more panels, fill that blighter with panels., you can see yourself the panels are £180 a pop, so doubling them would only cost another £1800 for double the solar benefits
4kw sse since 2014 and 6.6kw wsw / ene split since 2019
24kwh leaf, 75Kwh Tesla and Lux 3600 with 20Kwh useable storage
As mentioned above, get more on the roof if you possibly can or consider saving a bit with less battery. Pylontechs are easy to add later, panels aren't.
I found this calculator which seems to make more sense of ROI than the installer quotes
https://great-home.co.uk/solar-export-guarantee-seg-calculator
Solar PV 5.25kWp SW facing (14 x 375 Longi) Lux 3.6kw hybrid inverter and 4.8kw Pylontech battery storage installed March 22
Octopus Flux electric and Tracker gas
We could do another 5 panels on the garage roof but that array would have a slight shading issue I think. Is it possible to have 3 strings? They have done the 10 panels as 2 strings of 5 and the inverter can only take 2 strings max from memory.
Considering going octopus go for the cheap night charging too to make better use of the batteries too. They quoted me originally for the 4.8kw batteries but the bigger ones were £600 more and had a higher discharge power I think they said too
Or with a larger conventional Inverter you could have your main roof as one string of 10 and the garage as a second string of 5.
Octopus go is only available if you have an EV, but if you do then large batteries make a lot of sense. Solar covers as much as it can during the day and then top the batteries up overnight.
It really depends if you want a "fit and forget" type system, or if you're like me, energy monitoring becomes a new hobby and you've time to check out the prices and make adjustments to when you run appliances, fill the battery etc.
E7 might work but I don't know the new rates.
Solar PV 5.25kWp SW facing (14 x 375 Longi) Lux 3.6kw hybrid inverter and 4.8kw Pylontech battery storage installed March 22
Octopus Flux electric and Tracker gas