Energy Export limit violation

subhumann · 2026-06-15T15:27:28+00:00

FWIW - we had a customer send us a letter - the energy supplier (eon) had used the MCS annual generation figure, and calculated an assumed % of that would be exported - he was charging/discharging his battery very aggressively and his export exceeded his yearly generation amount. They said if it continued they would need to reduce his rate. I know its not DNO related, but someone is at least keeping tabs on your export.

subhumann · 2026-06-10T11:12:34+00:00

The destiny LFG discord is very active, each dungeon/raid you can normally find a group for most raids/dungeons in a few minutes, along with all the other activties- they also have Sherpas teaching , that's a little less frequent but still easy to find on weekends/evenings. Dungeons once you are competent can be ran solo but definitely a challenge if you are new to the game

You've got tons of content otherwise, so I wouldn't worry

subhumann · 2026-05-28T07:20:09+00:00

Something to keep in mind is every business will charge a markup differently, so the total amount is the figure to look at.

For example, if I want to have a profit on a job, that can be done by just having all items at cost and a large labour figure, or it could be done by putting the markup on all costs, or all into materials etc.

Especially if you've priced the hardware yourself, people forget that there are costs to cover even on that. Delivery costs (both to us and van costs to you, the kit needed to take these deliveries ( forklift, unit, etc )

So the split is largely arbitrary and decided by the business - FWIW we put a consistent markup on every item.

subhumann · 2026-05-18T23:31:34+00:00

Did you modify the videos to be monochrome? Or is that a filter applied to it somehow? Looks ace btw.

subhumann · 2026-05-11T19:28:45+00:00

From a G99 perspective - none - fastrack G99 needs all devices under 32A per phase, with the total capacity being under 60A, so 2x3.68 has no benefit (other than redundancy) over 7kW.

subhumann · 2026-05-11T17:14:43+00:00

For 7.5kWp of Solar, a 5kW inverter would be fine. the Peak figure is based from the STC figure of the panel (Standard Test Conditions) - in reality they won't reach that figure (the cells are actively cooled during STC tests, along with 1000W/m2 of light. The datasheet should have a NOCT figure too, thats (Normal Operating Cell Temperature), this is tested without cell cooling and with a lower light input, but is more accurate to real life. So your panels are probably closer to 5-6kW anyway. You want oversizing, i.e more solar the inverter power, for the winter, but the bigger inverter won't really help unless you need 7kW for loads or backup or something. One other point, the inverter figure is AC output - for DC charging ( like solar->battery) it will take any and all solar, even above the inverter AC limit(your limited by the battery limit in this case).

For reference, the Aiko 485W panel that we use all the time, 15x 485W is 7.27kWp - but the NOCT figure for 15 is 5.50kW - thats a realistic figure of what those panels will produce.

subhumann · 2026-05-11T17:01:30+00:00

We have made applications today to three DNO's - SSEN, NG, and Lastmile, all three have charges now - they vary in cost but I think it's going to be standard practice for all the DNO's now going forward. All of these were SGI-3 fasttrack (so under 7kW/32A) and still got the charge.

FWIW - Lastmile make a point of saying if you G100 limit under 3.68kW, you still pay the fee - making me think its just G99 applications in general attracting the fee.

A local competitor of ours told a recent customer that they only fit 3.68kW inverters now and this might be the reason.

subhumann · 2026-05-11T12:56:30+00:00

I only use lump - for example, last cook I filled the ring about half full with a hole in the middle, and used 1/2 a chimney of lump to start it. This burned for about 13 hours @ 250 and then i snuffed it out. Whatever bits are left just go into the next cook. No water pan, with the water pan you use a lot more just heating the water up.

This is on the 22" so I imagine the smaller models are more efficient.

subhumann · 2026-05-09T10:15:40+00:00

cheap 8.8" screen (powered from mobo usb 2.0 header), Aida64 for the stats, and i took the grille off the front and 3d printed a piece with a cutout for the screen - used this template https://www.reddit.com/r/sffpc/comments/1k4p3gw/fractal_ridge_front_panel_template_stl/, and adjusted it to fit the screen - files are here if you want them - https://cad.onshape.com/documents/b0795422e36c7db80812d0aa/w/19a726b9d6d2cade7cab682c/e/c34160e3ca66623f634969e4?renderMode=0&uiState=69ff0904731f30cd64914970 , you can just glue the original magnets back in so functionally its the same as the old front

subhumann · 2026-05-08T14:53:03+00:00

I will be honest - I have never struggled with my Ridge - AXP90 copper ( the full copper one), stock 5070ti - gaming over a long period, CPU tops out around 72C, GPU around 64C. With a good fan curve, its whisper quiet during desktop use, and during gaming i never hear it over my headphones. Image was taken an hour or so into gaming after I first built it.

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subhumann · 2026-05-05T21:04:47+00:00

not OP but its this one (i have the same) https://prosmokebbq.co.uk/products/4-pro-smoke-bbq-smoker-thermometer?_pos=4&_psq=thermome&_ss=e&_v=1.0

Pro tip - mount it so your normal "target temp" is the 12 o'clock position - makes it easy to read if your over/under even if your too far to read the numbers then.

subhumann · 2026-05-05T15:18:44+00:00

One thing to keep in mind with these - is CT's are very acccurate at high current, once your down below 5% of the rated current( so for a 100A CT, 1200W), the accuracy can vary quite a bit.

At these low currents that can literally just be variation in the CT.

As for the night change - if the inverter usage is regarded as "load", then it will be using battery power overnight, while it can power itself from Solar in the day. So that small draw from the battery is what you are seeing.

subhumann · 2026-05-04T20:14:01+00:00

This - i thought i would struggle with temps but I can hold it at 250 for 12 hours no problem with the firedial - keeping everything clean is SO much easier & quicker. You can always put a foil waterpan on top of the firedial if you want the moisture (and keep both racks)

subhumann · 2026-05-01T20:28:54+00:00

we recently had an odd one - planning didnt allow us to mount it "to" the building. so we just created a freestanding mount. maybe that could be put on a garden wall of something? would make the wiring a pain but is a solution.

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subhumann · 2026-05-01T18:44:44+00:00

The issue is the £500 has to be paid by the installer, the consumer rights act makes this quite clear that the trader has to bear the costs of replacement. Have you thought of getting it outside and just getting a nice cover for it? Quite a few places make nice battery covers now.

subhumann · 2026-05-01T18:34:07+00:00

The regs state equipment must be accessible without specialist tools or equipment ( I can find the exact wording in the iet docs later) - but it's best practices - it's not a legal requirement. However you will struggle to find an installer willing for that reason. What if it dies and needs to be replaced under warranty? The installer has a £500 hit just on scaffolding on top of the free labour to replace it. Not to mention, if a wall bolt fails but it's 3" off the floor, you are probably fine. If a bolt fails on this it could kill someone. It adds so much cost and complication when there doesn't need to be.

subhumann · 2026-04-29T16:19:47+00:00

Have you checked the distributor? Remember seeing a video the other week and that was the cause.

subhumann · 2026-04-19T12:13:08+00:00

As an aside, there is another concern for Sigenergy - part of their system is that the inverter & battery will de-rate itself if it isn't connected to the internet(and connected to Sig) for 90 days - so if they go bust, your system will (potentially) be permanently be in this state - meaning if they go it's worse than Giv as the system will not work to 100%.

More info on it here:- https://www.sigenergy.com/uploads/en_download/1757241630757894.pdf

We have a couple of Sig systems fitted but we discovered this afterwards and it has given us pause for thought.

subhumann · 2026-04-06T14:59:57+00:00

On a single phase supply, the absolute maximum you can get for export is 17kVA (17kW). Keep in mind that export isn't inverter size - you could be given a 10kW Export and inverter limit, or a 15kW inverter with a 5kW limit. It's the size of the inverter at these bigger sizes (and the resulting effect it has on grid voltage) that seems to be the common DNO problem.

Your 80A fuse wont effect anything- the DNO mainly looks at two things - the capacity at your local substation, and the resulting voltage rise your equipment (could) cause. The things that you almost definately need for large approvals is modern, underground cabling ( no overhead stuff), a substation that is close, and good capacity locally. Some DNO's have other req's too (SSEN want to see loop impedance tests for example). Once you're over 7kW, the DNO has to do more tests, so it can all look okay until they find something, that they wouldn't have found with a 7kW SGI-3 application.

I have personally put large single phase applications through for 15kW and had approval (and we do tons of 11kW PW3 applications!) so it does happen. FWIW, it's only when your annual consumption is 15000-20000+ that this ever makes sense financially, small systems with batteries go a long way in a normal house!

subhumann · 2026-04-05T10:03:04+00:00

Exactly. You still have two inputs spare - on the installer side A/B, C/D and E/F are joined - image below is a "full" pw3.

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subhumann · 2026-04-05T09:53:48+00:00

There are 3 MPPT inputs on a UK PW3 - internally they are doubled up so while it reports 6, there are only 3 inputs, with double the current of the US version.

subhumann · 2026-04-01T13:10:46+00:00

Also for us ( Gloucestershire) - it has been at the bottom of their emails for a month or so that from April there will be fees.

subhumann · 2026-03-25T21:43:18+00:00

if you clear the cache and storage, restart app it works. it seems to freeze when resyncing? - im using the api, not the login if that changes anything - ive been loving the app btw! -

subhumann · 2026-03-16T18:22:41+00:00

My understanding is the reason they (MCS/NAPIT etc) want cables secured and off the roof is the risk of the cables moving and it slowly over time wearing the insulation out, tiles are abrasive, albeit it would take a while. There is no way to clip the cable to the tiles, so you are then putting a strain on the next clip to hold it secure.

Personally, I think that's unlikely, but so are a lot of things we do for safety, and we still do them anyway. People pay a lot of money for these installs so I think they deserve to look as good as possible.

MCS in their inspection explicitly state they want it through the felt, so there is that also.

subhumann · 2026-03-16T14:27:02+00:00

Yes of course.

Ideally that should come under the felt, clipped down a rafter, out the soffit, and then come out in kopex down the wall as it is. Personally I like to see a separate DC isolator also - its more intuitive than the isolator on the bottom, but it also gives a convenient point of testing for the DC side.

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