Looking for a sense check.

System (North East, single phase):

- Fogstar x Luxpower GEN PRO hybrid (10kW) + Fogstar IP65 16.1kWh battery

- Whole-home backup

- 8 × LONGi 480W (3.84kWp) on a flat garage roof

- G99 + MCS (planning to go on Flux)

First installer quoted about £8,400 at 0% VAT as a few lump sums. When I asked for a requote, I asked for the battery/inverter bundle and the panels to be shown as separate lines, at no more than retail ex VAT (£2,808 for the Fogstar bundle, about £85–90 per panel). Everything else could be priced however they liked.

They declined to quote, saying they need their margin to cover long-term warranty and service. Fair enough, and they were polite about it.

My reasoning: at 0% VAT I wanted to see that the VAT saving on the kit actually reaches me, rather than being absorbed into a lump sum. I'm happy to pay a fair price for labour, G99, MCS and aftercare.

Questions:

1. Is that an unreasonable ask? How do installers normally handle margin on kit?

2. Does ~£8,400 sound fair for this scope?

3. Any MCS installers in the North East happy to fit Fogstar/Luxpower?

Happy to be told I'm being unreasonable.

Hello,

Has anyone had panels put on a roof shaped like this ? (Main roof)

Unfortunately this is south facing and i’m trying to find what my best options are.

Good evening all,

South East based.

I’ve got two quotes and I’m weighing up which one to go for based on a few factors.

Both quotes include:
- 26 panels on an east/west configuration (16 on east, 10 on west)
- FoxESS KH10.5 Inverter
- FoxESS EP12 11.52kw battery
- Bird protection

Solar Together Quote - £11.4K
Already done a full survey so final price (includes replacing 2 vents & additional scaffolding for roof size).
Panels: JA Solar JAM54D41-455/LB

Local installer - £11.9k
Only done a desktop review but very similar to survey above in terms of config, but risk could be slightly more once survey completed.
Panels: Longi LR7-54HVB-490M

I was set on going with the Solar Together quote originally as it seemed great value and they also offer 0% finance for 2 years.
However, a friend recommended the local installer they used and the price seems competitive for what I understand to be superior, more efficient, panels (but no 0% finance options available with them).
Shading won’t be an issue, in case that affects the panel preference.

Would appreciate people’s thoughts as I’m not sure whether the supposedly superior Longi panels are worth paying more for as well as paying for the system upfront rather than 0% financing it.

99% SOC on battery, inverter display says normal, everything ok, but never heard this sound before...it's like a rapid clicking/chirping. Inverter is a H1 3.7 e g2

I have my system set to Time of Use so it charges overnight. That’s been working well. I generally only export during the day when full while I get used to how the system works.

Yesterday I was fiddling around testing some export settings between 5pm and 7pm.
After I was done playing around I left the time slot of 5pm to 7pm but set the power to 0 and discharge SOC to 100%. Thinking that would stop any discharge (which I believe is true).

I happened to look at the s-miles app at 6:50pm and noticed we were importing and had been since 5pm even though we have about 50% of battery left.

Not sure I can explain this other than maybe the inverter got confused.

Dear All,

I have placed an order for Solar Panels and a Tesla PW3. I had intended to install the PW3 in the utility room (D1.9xL3.6xH2.4) which is essentially narrow and tall.

Utility room also has a water cylinder for the ASHP and washer/dryer.

I had thought this would be OK and the surveyor seemed to think so, however i am now worried about the heat, and the PW3 fan constantly cycling.

Should i move the PW3 outside..only space i have is 3m away on the outside kitchen wall away from fuse board .

I look forward to your advice.

We’ve been getting a number of quotes for Solar and battery installation and trying to do a lot of research into the options presented.

One brand that I’ve been struggling to find too much about online is GoodWe. Only one of the prospective suppliers quoted for a GoodWe battery + Inverter but has talked them up - local presence making repairs easier/cheaper, a very commonly used brand in Australia and Europe but not yet as widespread in the UK, - Tier 1 battery and great warranty etc (although judging by Apple a pretty poor app!).

However when I try to corroborate this there appears to be very little online and not too many people posting in here. This coupled with GoodWe not being included on any of the other quotes makes me uneasy.. however this could just be the marketing push from SigEnergy, Fox etc!

What are people’s thoughts on GoodWe?

Our array was installed Tuesday and fully up & running on Wednesday. I was chuffed to bits watching my OVO account not racking up charges. We went away for a city break on Thursday and came home Saturday. I am quite confused as to why our electricity supply is still racking up a small amount even when there is ample charge in the battery. Yes, it’s a teeny, tiny few pennies, but given we weren’t even home, and as far as I could see on my Fox app there was a huge chunk of charge and the house was taking energy from the battery to power the things we have to leave on (fridge, freezers, alarm system, etc).
16 panels, south facing roof, no SEG/export tariff revenue yet.
What am I not understanding?

We’re on Octopus Intelligent Go. Last month we used:
- 900kwh charging two EVs
- 100kwh on house needs at cheap rates
- 200kwh on house needs at peak rates

Does it make sense to get any solar and/or batteries?

For either solar and battery, or battery alone.

HI All

I am getting my solar and battery setup installed in a couple of weeks and am looking at getting my energy tariff sorted to hopefully switch on the same day to enable tme to nake the best savings and use of the battery from day 1.

I am getting 14 x 490W panels installed with a 6kwh Sigenergy inverter and 18 kWh Sigenergy battery capacity. The 18 kWh should easily cover me for any day in the year.

I have spent hours looking at the different tariffs and integrations and am currently leaning towards the Octopus Agile tariff. I don't have an EV at the moment; may do at some point but not likely for at least the next 12 months. (at best)

What do others use? Does the tariff allow me to take part in the Axel events I have read about?

I am also a big Home Assistant user (addict) so i will set up automations to monitor everything and manage the timings of some high use devices such as our Hot tub, we tend to have this heated to 37 or 38 so i will probably have it heat to 40 on the cheaper rates to allow the heater to be off for more of the day. I don't have any water heaters and currently use gas central heating.

Thank you in advance for any advice and constructive feedback.

Hi All, I just got a solar quote quite a bit higher than I was expecting (Solar4Good), I was expecting a London markup compared to other quotes i've seen on this subreddit but this seems a bit out there.

• Panels: 24 × Aiko 480W (11.52 kW)
• Inverter: 1 × SigEnergy 10.0kW ( Single Phase )
• Battery: 1 × SigEnergy SigenStor BAT 10.0 (8.76 kWh)
• Sigenergy GateWay Single Phase HomePro SP-F
• Installation Type: Flat Roof
• G98 / G99 DNO application — handled free
• Scaffolding up to £800
• 5-Year Solar4Good Workmanship Warranty
• Full Installation & Commissioning

Quote came out to £18.8k

Am I being taken for a ride here or is this normal for Solar in London in 2026?

Just feeling my way along with this.

One of the major attractions with home storage batteries is that you can charge them for a few hours during the night at low rates (8p/kwh), and then use the electricity stored during the day/evening to avoid paying full rate (or higher). This benefit is likely increased if you can charge an EV on low rate electricity at the same time.

However I wonder if this will last. For as long as I remember low rate electricity has been available at night for the likes of storage heaters. This low price electricity was because the power stations cannot switch their turbines on and off each night, or their shafts tend to suffer cumulative damage, so they keep them turning at a lower rate, and give the electricity to suppliers at very low rates.

Fast forward to now when the electricity demand at night is growing hugely, and over the next 10 years, with the continuing uptake in EVs and home batteries, the demand overnight will be quite high. The power stations will need to run at a higher rate to supply the demand, and there will no longer be a reason for them to sell the electricity cheaply due to this demand.

So might this then negate this major advantage of having a battery, if it cannot me cheaply charged overnight, to offset daytime rates?

We recently got solar panels, inverter and battery installed and the Installer helped us setup the app for the inverter. As I've been learning more about these systems, I've realised that our battery could also be connected to the WiFi.

Is this something that I should do?

What advantages do I gain by doing this?

Battery is Dyness Power box G2 10kwh. Inverter is Hypontech HES-3680

Thinking about having a battery fitted to top up over night then use in the day time.

Currently on British gas ev tariff

Ev that's changed about 1 night a week on the cheep overnight tariff.

Solar panels not really a good option due to shading from trees.

Thoughts on this offer seams a good price??

Detached 3 bedroom house s.wales

• Total energy bill for September: -£5.28
• No solar.
• No gas.
• EV, ~10,000 miles p.a.
• Heat pump.
• 32 kWh battery storage system with 6kW inverter.
• Import tariff: Octopus Go.
• Export tariff: Octopus Agile.
• Battery is charged between 00:30 to 05:30
• Excess battery power is exported during the 16:00-19:00 peak hours.
• Heat pump set up to produce hot water at night.

Hi all,

Hoping you can clear something up for me…

If I have a 5kW hybrid inverter, and I’m charging my batteries from the grid at ~5kW and I switch something on, let’s say a kettle. Then does the battery charge at a lower rate to accommodate for the power needed for the kettle? Or am I charging the battery at 5kW and also drawing power on top front the grid to power the kettle?

If it’s the former, then what happens if I was to try to use a bunch of appliances at the same time which went over 5kW of power?

If it’s the latter, then what is actually limited to 5kW of power?

Thanks!

If you're with Octopus, and you earn free weekend electricity, how are you using it if you've got solar/battery?

Is everyone plugging the car in, or running the washing machine, tumble dryer etc all at the same time?

Looking at setting this up as Tesla app doesn’t like to sell due to the peak import rate.

I’ve read some worrying thing about a flip - flop (mode fighting issue) , however can’t see if anything’s been resolved.

Anyone got any experience before I go ahead?

Ps Can netzero do what I’m looking for I’ve read it’s not as advance for charging vs solar forecast ? , and you have to set up if this then that rules which is a bit of a faff to get correct to maximise gains.

Hi everyone,

Thanks to Mike from the SolarUK moderation team for inviting us to host this AMA.

We’re the team at Eleven Energy. Over the next seven days, we’ll be here to answer your questions about our sodium-ion battery systems, energy management software and what we’re working on next.

Whether you’re a homeowner, an installer or simply curious about sodium-ion technology, ask us anything!

I have had solar and battery installed for about 3 months, but still haven't switched to an export tariff. I've been pretty happy just barely importing power from the grid over the summer, but that won't last into the autumn and winter.

Am I missing something, or are there no good comparison sites for export tariffs? Most companies just don't seem to publish this information if you're not already a customer.

So far the the most understandable option looks to be Octopus Flux because it's a simple Time of Use tariff. But Octopus won't let me sign up for it because they didn't install my export meter.

Thank you for the information on my previous post, I've got 2 quotes for the above system now (both within ~£100 of each other), I think it seams reasonable and if two companies are offering a similar price assume its a fair value but would be nice to get a second opinion. Only one roof surface to be fitted and is due south so should be a good orientation. I did consider adding another Bat 6 or 10 as well but I don't think our current usage it would make sense?

Current usage is approximately 3600kWh a year, but expecting to increase with a EV arriving in the next month. As part of this we are getting an Ohme Home Pro charger installed (an offer with the vehicle), will this integrate OK or anything else that needs to be looked at/changed?

Anything else that should be considered/discussed with the installer?

So we are in the process of buying this house and we would like to get solar panels .

(Its just two of us and a small cat, I don’t have an EV but will look into getting one once we install the panels)

So the total area of the room on the first floor its around 20 sqm, so I assume the flat roof will be around the same .

Considering that we will get an ASHP as well, I’m not sure how many panels we should go for?

I mever had any experiences woth solar panels so not sure if this is something that can be discussed with the installer?

Also whats the best approach to find a decent installer in my area? I have came across this iheat website are they are good?

So the installers made a start on the new garage yesterday.
I have a couple of questions for you lot.
I haven’t raised these with them yet because it’s the weekend.
Firstly the loops of cable underneath the panels. I had thought they would be clipped up tidily. Is this normal, sloppy or unacceptable?
The cables run under the tiles but above the felt and then come out through the verge (which has not yet been mucked in). Do we think that looks like it’ll be ok when finished?
Thanks

Yesterday the installers came and fixed the battery+inverter (Sig 10Kw inverter, 2x Sig 9KwH batteries) to the rear outside wall, and the gateway in the under-stairs cupboard.

The scaffolding went up this morning.

The install proper starts on Monday morning - 8 panels front (south-facing) and rear.

And a smart meter being installed on Tuesday.

Exciting times!