I export down to 20% of my battery during peak, leaving enough to get me to off peak charging times. I’ve noticed this graph on my app, showing export continuing during my Self-Consumption period after 8pm after I’ve done the discharge - if I’m reading right, that’s the revenue I’m generating. Is this correct? I should not have any “leakage” back into the grid, especially as there’s no solar.
Hi all,
Somehow a year has already passed since my installation, which is documented here for anyone bored: https://www.reddit.com/r/SolarUK/s/3jXEIXZEek
I’ve kept track of everything on a spreadsheet to monitor how the payback is going and various other nerdy stats. It was a huge personal investment for me, so I’ve been keen to reassure myself it has been worth it.
When I previously posted this, I wrote a terrible misleading title (which cannot be edited). It was also rightly pointed out I had not taken into account the loss of interest due to the initial outlay in my figures, so I’ve tried to incorporate this below.
The demand:
Estimated 13,000 kWh per year
EV charger, ASHP - property only uses electricity
The setup:
x40 475W Panels split over East/West
16kW SigenStor Battery
12kW SigenStor Inverter with 9kW export
The headline stats:
15.05 MWh Generated (9 Trees)
11.89 MWh Exported
11.56 MWh Imported
System payback:
I was originally paying on average £280 per month on electricity bills. I’ve calculated this to be £94 average per month or £1128 for the last 12 months. Incredible considering I was spending around £3360 per year before. I’m therefore saving £2232 per year on bills.
On average I make £152 per month export (£1834 in 12 months which HMRC has to be informed of), however the bulk of this was at 16.5p so that was good whilst it lasted! I’m waiting to move to EDF at 15p for the next 12 months, whilst I wait, I’m with Fuse at 13p.
With the huge benefit of export, on average, I am £58 per month in the green, not taking into account the initial outlay.
Install cost was £16,800 (March 2025 in West Midlands) and the payback was calculated at 5yrs 6months
12 months in and I’ve calculated this to be down to £12,554, so £4246 in 12 months.
That would place me on track to approx 4 years payback, but obviously the export rates play a big part in this and I fully expect these to reduce over the coming years.
The Opportunity Cost:
I wanted to see how this compares to if I had just left that cash in the bank or invested it. I won’t pretend to know about this and relied on Google and AI to help me present and fact check it.
- If I'd put it in a 4.5% Cash ISA, it would have made ~£756. Subtracting that "lost" interest, my net solar benefit this year is still £3,490 (putting me on a 5 year payback track).
- If I'd thrown it into an index fund averaging 7.5%, it would have made approx £1,260. My net solar benefit drops to £2,986, moving the payback back to my original 5.5-year estimate. (I’ve not factored in Capital Gains Tax)
Even factoring in the lost investment gains, a tax-free net return of 17.7% (or a raw cash ROI of 25.2%) in year one blows standard investments out of the water. Unless I am missing something? Feel free to correct my understanding/figures.
As for equipment depreciation and lifespan, with a 5 year payback track and a 10-25 year warranty on the sig and solar, the system will be generating pure, tax-free profit long after it has paid itself off. (Addressing another point that was raised previously)
I’m obviously not saying this is the case for all solar/battery installations and there are numerous factors to take into account, but it’s safe to say I’m very happy with my decision and the outcome so far.
Hi Everyone, looking for some help with Home Assistant automations.
I'm ideally looking to trigger my battery to charge when my car is charging to take advantage of Intelligent Octopus Go.
I've been trying to trigger this using the Intelligent Dispatching turning to On, but seemingly that's incorrect as it doesn't seem to automatically start charging, I have to manually trigger for it to start working.
The second part is that when charging the car finishes I'd like the automation to stop, and go back to AI mode - so it decides to dump the battery or save for the day ahead. I've heard there are alternatives to this in home assistant so open to suggestions.
I have a Hypervolt 3 Pro.
I've attached the two YAML files - have tried using Gemini/Chat GPT which thus far has given me wrong answers...
Thanks!
Hi everyone,
Lately, the volume of referral code spam has gotten pretty bad. It's cluttering the main feed and making the subreddit much harder to use, especially for new users.
We absolutely recognize that these codes are valuable and we want everyone to continue benefiting from them, so we aren't banning them completely. Instead, we are giving them a dedicated home. To improve overall post quality, this sticky thread is now the ONLY place referral codes are allowed on the subreddit.
How this thread works:
I've gone through and deleted a bunch of posts from the last couple of months so if you've previously posted a code or referral link, you'll want to make a comment below.
Thanks for helping us keep the community tidy and focused. Drop your codes below! Don't forget to specify what region they're from as some are region specific.
Sigenergy have announced their next generation SigenStor domestic all-in-one solution, the Neo.
SigenStor Neo is a highly integrated, all-in-one energy solution designed as the first choice for families starting with solar and energy storage.
With AI as invisible intelligence built in, it simplifies PV and energy storage by integrating the Gateway into a single system-delivering smarter energy management that feels intuitive, efficient, and effortless from day one.
Reduced to what truly matters, the design expresses clarity and restraint. Familiar visual signatures are thoughtfully retained, carrying the story forward as functionality advances to meet new expectations.
SigenStor Neo seamlessly integrates the EMS, PV inverter, battery PCS, battery pack, and the backup module, essentially functioning as a simplified gateway.
Hi everyone,
I recently had a Sigenergy SigenStor 10 SP (single phase) installed at my home. The installation is finished, but I have a major issue with the installation company: they are refusing to grant me Owner access to the system on the mySigen app.
Instead, they are trying to force me to use a generic, third-party monitoring app and claim they "never give Owner access to any customer." I also have a maintenance contract with them, which is probably why they want to lock me into their ecosystem.
However, I want full control over my hardware. I want to be the Owner so I can revoke their access whenever I see fit. Right now, I have only paid 50% of the total invoice, so I still have some leverage, and they told me they are "escalating the issue to management."
Since I have full physical access to the inverter and the gateway, is there any way to override this or claim the device directly via the app? Has anyone dealt with a similar situation with Sigenergy installers, and did the manufacturer help you get the Owner account?
Any advice on how to handle this technically or legally would be greatly appreciated. Thanks!
I found this update a while back and thought it was much cooler than the classic logo. You can actually 3-D rotate it to see it from different angles. Haven't seen anyone post this, so thought to share it for those who like fancy visualization :)
I’m not sure whether to post this in the HA sub or here, so I will cross post it hoping that someone can help :)
I am a relative newbie to HA, but had a reasonably useful dashboard that has been working fine for a month or so. This morning I have found a few gauges failing to display correctly.
When I looked at the SigEnergy entities, it shows a lot of them as ‘Unknown’, but there are a number (e.g “Daily Import Grid”) that seem to be working OK.
Can anyone suggest a way of diagnosing the problem (remembering I am a relative newly with HA).
Thanks
I’ve had my Sigenergy system for well over a year now and it’s been working great. I’ve just got my first EV and this week I’ve tried charging it overnight on my Octopus Go tariff.
Both times it’s failed after about an hour or 10 kW.
I’ve raised a fault report with Sigenergy support but no response yet.
The fault itself is a PEN fault and is shown as:
Equipment Protection - PEN fault
Suggestion:
1.Check whether the PEN cable is disconnected;
2.Check whether the voltage between the PME terminal block and the real ground (such as grounding metal pipe) exceeds 70V;
3.When the grid voltage returns to between 207V~253V, the charging pile will return to normal;
After the PEN protection is restored, please close the PEN Breaker;
If the failure persists, please submit a failure feedback on the APP-support-troubleshooting page.
As this occurs each time I try to charge I’m thinking this is an equipment or installation fault as opposed to environmental.
I note that a separate Earth was installed as part of my system prior to the EV charger being installed but I don’t know how long it was and question if installing such a rod / Earth through a block and beam floor with cavity below is effective. However I don’t know if that is relevant.
Has anyone else experienced this? Any advice other than sit and wait for Sigenergy to respond? Is it safe to use still?
Email just went out:
> To our SigEnergy users,
>
> The SigEnergy development team are currently working on improvements to their API which we will be migrating to. They are in the final stages of releasing this.
>
> These changes are crucial for two reasons:
> 1. Too many of you have failed events because of the current SigEnergy API limitation on how many devices we can put into VPP mode at one point in time - this means you start events late or not at all!
> 2. Too many of you get stuck in VPP mode for sometimes hours at a time for a similar reason.
>
> Unfortunately, until this migration has completed, we have temporarily withdrawn SigEnergy devices from events. You will still earn your guaranteed £10 per month.
>
> We have looked into a method of participating you whilst we migrate (e.g. allowing you to manually export). If SigEnergy does not complete the development work by 10th July 2026, we will invest in making this possible, but until then you won't be able to participate by manually exporting.
>
> Making these changes is important for the future reliability of the integration.
> We hope you understand and we apologise that we have had to temporarily take you out of events (we have tried very hard not to!).
>
> The Axle Energy Team
Frustrating for me as I use Home Assistant to automate this and it works a treat.
Hello,
Has anyone had trouble with their ai mode? The logic of mine is making no sense today (or yesterday) and i've had to override a few times. this is this mornings example. It shouldn't be exporting when the buy is negative (essentially being paid to use), and the sell is essentially worth nothing? Surely it should be buying negative to charge the battery?
I have a Sigenergy SigenStor battery system with a gateway installed for backup.
Last night my house power went out twice. The battery was sitting at around 5% at the time. I later realised I had changed the settings so that both Backup SOC and Discharging Cut-off SOC were set to 5%, which probably explains why the battery didn’t actually carry the house during the outage. Basically, there was no usable reserve left once it hit the discharge floor.
What I’m more concerned about is the logging/alerting side.
Because the house power went out, my router and network also went down. I do have 5G backup internet, but obviously that doesn’t help much when the network gear itself has no power. So I understand why I may not have received a push notification at the time.
But I expected the Sigenergy app to show somewhere afterwards that the grid had gone offline, or that the system attempted to go into backup but couldn’t because the battery was already at the discharge cut-off.
Instead, the only alerts I can see are two short “Communication fault / Gateway communication abnormal” alerts around the outage times. I can’t find anything obvious saying:
Is this normal behaviour for Sigenergy? Does the app not expose those grid/off-grid events to the user, or should I be seeing a proper grid outage record somewhere?
I’m trying to work out whether this is just because the internet/network dropped during the outage, or whether the gateway/app/system should still have locally recorded the event and synced it later once everything came back online.
Interested to hear from anyone with a SigenStor + gateway setup who has had real outages or done a controlled backup test.
Hi everyone, I'm using the AI mode and most days where there is good sun generation my battery is being drained to zero at around the same time (around 8:30am), then the sun charges it back. Is this normal? As with most lithium batteries surely this is not good for battery health?
Longish post, sorry in advance but looking for some advice and help re my charger and sig system not playing well together
I had my Sig system installed last week (5.7kw array, 6kw inverter, 18kw batteries and gateway).
I already had an Ohme Epod EV charger installed at the start of the year to my consumer unit.
I'm on Octopus IOG EV tariff for cheap overnight rates with some cheap daytime rates decided by Octopus.
My installer has wired the Ohme into the Smart port on the gateway. I had asked for it to be blind but there was a miscommunication. I chased it up and was advised that Sig prefer it wired to the smart port and the AI will sort it all out.
Up until last night the system was charging my car via the mains for 99.9% and took about 0.22kw from the house battery, all run by the AI max profit mode. I spoke to Sig today who advised me to wait a few weeks for it to learn and it would stop draining the house battery. They confirmed that the smart port can't detect when octopus gives me cheap electric slots during the day but said the smart port connection would ensure no drain from the house batteries.
From the images attached, you can see that I found my batteries just now half empty after being full all day and have been discharged into the car which was plugged in at 9pm. The system was in AI profit mode but I switched to a time based setup just now when I saw the drain and it's since slowed the battery drain and switched most of the supply to the grid. I know I could force hold the batteries but this isn't a long term solution.
Can you smart folks advise if it's best now to get my installer back to rewire the Ohme so it's blind so I can let Octopus do their thing and let Sig handle the solar and house battery separately?
I've also just realised that my plans to self discharge the house battery to the grid at around 9pm for a few hours (on an export rate) and then recharge at around 2am on the cheap rate will potentially conflict with the car charging as it seems if my car is charging during a house discharge, it's going straight to the car.
Might have gotten some of the assumptions wrong and if so, please advise as at this stage I'm getting fed up and on the verge of asking for it to be switched to a blind charging system and leave the smart port empty.
I'm not bothered about solar charging at this stage as my overnight rate is so cheap but would be happy to have it as an option if possible.
Edit: > Been pointed out that my system won't export and import at the same time. What I aim to do is have the house batteries discharge at a different time now still doesn't explain why last night when in AI mode for max profit the system chose to dump my batteries into the car when Sig told me it shouldn't do this.
Still keen to learn lots so grateful for any words of wisdom.
Hi, I’ve been on AI Balance mode for a while and everything was working as it should have. However since yesterday, it stopped discharging the batteries to grid towards the end of the as it use to! I have not changed any settings so was wondering what’s causing it.
I am on EDF Go EV tariff and Export 12m. So during the night I can import at 6.99p and export at a flat 15p all day.
I set AI mod, and it decided to constantly import and export in the night to exploit that price difference.
Surely that is going to against some type of T&C? What do others do?
Which tariff do you select in the Sigenergy app for Octopus agile outgoing?
The rates don’t match my octoprice dashboard.
Hello everybody,
been enjoying my Sigenergy setup for over a week now and I love it! Before sigenergy, I just had a small plug-in solar with 1000W and an 800W inverter. How do I implement it into the mySigen app / Software? The inverter is still working, yet I want the Sigenergy inverter to know that there is another power source. I see there is the possibility to use a sigenmicro inverter. But my dealer told me those are not available at the moment? Also I found inverter but then I would have to buy a sigen sensor, as the inverter used now is a hoymiles inverter.
How did you solve this problem? Hoping for some feedback! :)
Just a heads up - if you didn’t know, some banks offer green rewards for home improvements like solar. I’ve just been approved for a £500 reward from Barclays as here
https://www.barclays.co.uk/mortgages/greener-home-reward/
Other banks also do similar schemes - I know Lloyds and Halifax will give you a very reasonable £1000 - if you have a mortgage it’s well worth googling.
Note there’s usually a time limit from date of install.
No idea who pays for it, but it’s another plus for an MCS approved installation!
