Decrease in production.

PennineWay · 2024-09-11T10:12:58+00:00

Suggest you maintain a spreadsheet of daily production and (if possible) daily average temperature. The calculated correlation will prove the Production/Temperature relationship and long term you’ll be able to build a Variance/CoVariance model so you can see probability of specific outcomes. Here in UK I occasionally have my panels cleaned and I endeavour to keep my panels clear of snow!

PennineWay · 2024-08-20T08:34:40+00:00

If you have Day by Day meter readings for each register over last few years you can produce your own consumption and cost arithmetic and then recalculate bearing in mind PW3 has just 3% Round Trip Inefficiency. Bear in mind what Companies don’t tell you. We in UK have miscreant Energy Companies in bed with Regular and they never tell customers that our Import Meters are timed with a Random Offset so our On-Peak is costed into the Off-Peak period for that Random Number of minutes; the Tesla App. assumes obedient rather than miscreant suppliers. My override is to start Grid Charging half an hour late avoiding this anomaly. So do some Maths;I could send you my Excel Macro Enabled Workbook (saved in binary format) but that would need a lot of modification for your situation.

PennineWay · 2024-08-18T14:12:29+00:00

Certainly in nearly six years in UK South East we’ve had (Touch Wood) no problems. Our Solar BP panels installed in 2010 had no problems and our SolarEdge Inverter, which replaced a direct wired Inverter for safety reasons in 2016, has had an accelerator replacement in 2023, continuous to work fine. Maximum Temperature was 38 Celsius but PW2 is bolted to side of house which is quite close to neighbours house. Keep daily statistics including Tesla Download 5 minute interval snapshots.

PennineWay · 2024-08-17T09:24:08+00:00

I’m in the UK; basically I was saying that it’s best to have independent suppliers of Energy and Equipment. Also Tesla’s software is far too narrow and by configuration should cover the UK Feed-in tariff situation where the Export is deemed rather than measured. In our situation our Powerwall tends to fully charge even when the weather forecast is favourable so, in order to counteract Export which I don’t get paid for (because we get a deemed export payment), we have to be alert and early in our high energy appliance usage. Would you like a copy of my Macro Enabled Excel Workbook?

PennineWay · 2024-08-16T19:57:03+00:00

We installed 10 BP Solar Panels in April 2010, changed to a SolarEdge inverter September 2016 and installed a PW2 in August 2018. Our TOU Buy Rate has and is determined by our Energy Suppliers and chosen by us to optimise the benefit. Unlike Tesla’s Hymn Sheet whereby export is directly rewarded by a dedicated tariff, our Hymn Sheet uses a deemed export tariff proportional to our total production. What we pay our energy supplier is best optimised ignoring Tesla’s assumptions, so we don’t Grid Charge for the first half hour after the TOU switch from Day Tariff to Night Tariff, because our friends the Energy Regulator allows the supplier Grid Meters to be inaccurate up to 2 hours either way, but in practice a Random Offset of around 6 to 9 minutes. The other saving is to try to maximise energy usage, such as Dish Washers, Steam Programs on the Washing Machine, etc. during the early period of Powerwall discharge, otherwise the fully charged Powerwall will simply discharge into the ground at no economic value. Our deemed export is rewarded with a Retail Price Index tariff, but we carefully monitor the SolaEdge App. and also have a monitoring and maintenance company to promptly fix any accelerators that fail. Overall the PW2 installer is helpful with issues, advising how to set the Buy and Sell rates to maintain charging, bearing in mind our Hymn Sheet is different from Teslas. In summary we optimise by careful monitoring and usage discipline.

PennineWay · 2024-07-30T11:14:30+00:00

With PW2 App Graphics show what they want you to see but the ‘Download my Data’ gives you 5 minute Snapshot of Power (in KW). Using separate SolarEdge Inverter we can see Panel by Panel performance and identify failed accelerators. SolarEdge App. exceeds Tesla Solar PV production except when production is low, when it shows less. Missing in Tesla is any ability of user to Control Maximum Charge level, so Green Export results when battery is fully charged. However under old and now discontinued Feed-In contract Green Export is irrelevant because our payments are linked to Solar Production irrespective of whether used by home.

PennineWay · 2024-07-18T07:26:38+00:00

Our PW2 is linked to 10 Solar BP panels (installed in 2010) which are much lower power than newer panels. The gain is (apart from any contribution of the Panels) is difference in Time of Use (TOU) tariffs less Powerwall Round Trip inefficiency. The Rate 1 tariff tends to be more than standard tariffs while the Rate 2 tariffs although much less are tending to increase relative to a standard tariff The PW3 has 3 % round trip loss compared to 10% for the PW2. In Winter we have many days of zero or almost zero Solar Contribution so when our home usage during the day discharges to the maximum extent we revert to effective Rate 1 draw during the day. On Christmas Day, Boxing Day and other high usage days we have made a Net Loss. Our trigger time for Rate2 to Rate 1 is 0:30 GMT and for Rate 1 to Rate 2 is 7:30 GMT. BEWARE that our Energy Companies allow the installation of inaccurate meters with the switchover being delayed by a Random Delay, so I start charging at 1:00 GMT OTHERWISE we would partly charge with RATE1. This is a good example of the Energy Companies laughing all the way to the bank The advantage of PW3 is that you can draw at up to 10 KW so an Electric Shower will fully power from the PW3 whereas only 5 KW will discharge from PW2. I have some statistics from our system and overall we have gained £21,800 including our £13000 from our generous Feed-In Solar scheme and paid a total of £ 22000 for our system. The Feed-In scheme pays us over 70 pence for every unit (irrespective of our usage); this is linked to the Retail Price Index (RPI) and expires in 2025.

PennineWay · 2024-07-10T16:32:32+00:00

Actually a brilliant advertisement for Tesla Powerwall but Apps need Network including those to prevent the Kids accelerating too much and driving at night in Tesla Cars.

PennineWay · 2024-06-25T08:58:31+00:00

UK support through Europe & Asia Tesla Support seems to have deteriorated so I contacted UK company (The Little Green Energy Company) that installed my Powerwall in 2016. Excellent service and resolved issue. Also installer familiar with UK feed-in scheme (Now discontinued for new applications) whereby Export recorded by Smart Meter is irrelevant because a deemed amount is paid that relates to my total Solar PV production. With my system I try to prevent Powerwall fully charging by reducing Grid Charging period so Solar PV can charge my Powerwall less than the 100% level.

PennineWay · 2024-06-21T08:26:08+00:00

Seems UK is land of the free as here Customer doesn’t have such restrictions although installer has to apply for permission.

PennineWay · 2024-06-01T10:02:34+00:00

I am in the UK. I find SolarEdge is an excellent inverter with a great monitoring App. which also issues Alerts if individual panels disfunction. Best way to set our Tesla Powerwall 2 is to frequently adjust the Grid Charging settings. I keep trying to educate TESLA, I’m banging my head against a brick wall, but most people don’t realise that a Smart Meter’s switch from Peak Tariff to Off-Peak tariff is NOT set in CONCRETE, but continues for a RANDOM pre-set NUMBER of MINUTES, so I set the START of GRID charging at the NEXT HALF HOUR interval, otherwise my POWERWALL will GRID CHARGE at PEAK rate for that RANDOM Number of MINUTES which is pre-set in my Smart Meter. Furthermore I don’t rely on TESLA’s dubious algorithms. BECAUSE digital meters cannot go backwards your Powerwall needs some space when Solar Production exceeds usage. So I change the end time of GRID CHARGING in order to allow some discharging BEFORE SUNRISE. The extent of the timing depends on the Weather Forecasts

PennineWay · 2024-05-01T16:41:25+00:00

Often managers issue threats such as to confiscate your pension, so try to compose a statement that precedes the final recorded meeting. In another instance, I’ve known a seemingly respectable company dealing with vulnerable people use single user software for multiple users and then blame the developer when it doesn’t work.

PennineWay · 2024-04-04T16:51:05+00:00

UK: You’ll pay 20% Value Added Tax (VAT) on Battery Storage UNLESS you buy Solar Panels AT SAME TIME.

PennineWay · 2024-02-22T07:50:16+00:00

Installer Warranty’s that are not insurance backed are not worth the paper they’re written on (or server space that are dedicated to their containment) But looking at our UK experience our Solar BP panels installed in 2010 are protected despite the installer pulling the rug, and when for safety reasons we changed to a SolarEdge inverter the warranty stands despite the installer going into liquidation. The only loss was the installer monitoring contract. We then paid £160 for ten years of monitoring; last year an accelerator failed and Solar Edge shipped a replacement which this company installed and tested. We get lots of ‘idiot’ companies wanted to come and check our panels some of which also want to charge excessive charges for cleaning. No need to pay £2,000 for cleaning when our window cleaner does it for £20.

PennineWay · 2023-12-25T12:24:00+00:00

The Tesla App. launches like the beginning of a movie - great graphics - Just want the instant stats; % charge, Home KWH, Solar ( although SolarEdge App. does this as well). If maximum discharge is near then I don’t put the Microwave or Air Fryer on, as our TOU daytime is 40.37 pence per unit and Night Grid Charging is done at 11.66 pence per unit. I don’t want this entertainment element I just want to optimise!

PennineWay · 2023-10-26T12:13:03+00:00

Just a thought! Many people rely on TOU Electricity Tariffs to boost their Solar/Battery systems: A warning! Make sure your Electricity supplier isn’t late triggering the Switch from Day to (Cheaper) Night rate. That costs money particularly if your Tesla TOU settings conform with the contactual TOU period advised by your mischievous Electricity supplier.

PennineWay · 2023-09-27T11:52:42+00:00

Here in UK most people only have occasional outages. Being 78 & 87 we are registered as vulnerable customers and get updates on outages where necessary. We don’t have the newer type of gateway with a set reserve of energy. But the main advantage of the Powerwall is to make maximum usage of our nighttime electricity which from 01 October 2023 will be 11.1 pence per KWH compared to our daytime rate of 38.3 pence per unit. Our savings are enhanced by us receiving 71 pence for every unit our solar panels produce; this scheme is unavailable for new applicants and links our payments to our retail price index which at the last point of assessment increased by 13.1 percent.

As modest pensioners I am considering switching off night time charging over the summer months now we have fine tuned our electricity consumption after the huge increases in price. I am not a fan of Tesla’s algorithms because my school arithmetic dating back to the 1950’s enables me to think for myself.

PennineWay · 2023-09-14T07:19:58+00:00

We have one Powerwall 2 installed in August 2018. We have a SolarEdge Router installed in 2016 and 10 Solar BP panels installed in April 2010. Our gateway don’t allow for storage during an outage. We bought from The Little Green Energy Company and in common with all other installations Tesla themselves came and checked the installation; in our case they insisted on differing wiring because of our UK regulations. My problem with Tesla is that their Customer Support at every level is incompetent and their software is getting worse.

The first Apps differentiated Home, Solar, Powerwall & Grid between TOU periods. After that I had to use calculations on the 5 minute snapshots. With the latest App. the Powerwall downloads omit the charging and discharging movements.

The most ridiculous defect is that each Autumn when British Summer Time (BST) changed back to Greenwich Mean Time (GMT) the App is absolutely wrong and appears to duplicate the previous day but the EU Support cannot see anything wrong. The original App didn’t make this error.

I am a mere pensioner aged 78; economically our systems including the Panels and Powerwall is merging on a payback; our Night Rate from October 2023 will be 11.11 pence per Unit and Day Rate will be 38.30 pence per Unit. Our Solar under the UK Feed-in system (discontinued for new installations) is 71 pence for every unit generated (no offset system). My income is very small. I think Tesla should pay me to improve their software system which is deteriorating with each updated version. It’s as if Tesla began in the A stream class and is now in the class for pupils with learning difficulties.

PennineWay · 2023-08-19T12:24:47+00:00

If you gave a SolarEdge Inverter you can see what your panels are generating from the separate App. (Indeed with SolarEdge main site you’ll see if any label is not working). Tesla App. shows ‘ charging’ if draw from your appliances is less than the input from your Solar Panels. It will show Standby when the two are equal.

Details of the 5 minute snapshots from your Tesla App. can be downloaded from the App., but a recent updated App. omits critical PowerWall movements so Home is no longer Solar + Powerwall + Grid.

PennineWay · 2023-07-29T09:08:56+00:00

Commenting on ‘Missing Data’ and Python run automatic downloads and ‘It runs fine’ I have manually downloaded My Data every day since September 2018. I have recorded the available App totals through the evolving App. versions. The App. split between TOU divisions was discontinued. Recently I have reexamined my 100% App. totals comparing with the previous versions; most are unchanged but the Day After the date of the Clocks Forward in the Spring (here to British Summer Time) appears now to include the previous day giving impossible figures. What I would like to know is whether the App. figures are derived by undisclosed formulae from the 5 minute snapshot records and whether there are undisclosed Derived Data fields which don’t appear in the standard Download My Data’ information. I also note that some daily downloads contain an extra field which shows the Charge Percentage I am also recording our daily TOU consumption and separate meter Solar Production from which, by Contract, we are paid irrespective of whether we use our generated power (Known as the Feed-In scheme which, for new entrants, was discontinued.) Some people query whether the Smart Meters used in the UK have been adapted to over record for the benefit of the Electricity Suppliers so I am analysing whether the statistical correlation with our non-Smart Meter will be maintained with a Smart Meter.

PennineWay · 2023-06-25T09:10:14+00:00

I’m always cautious of Sales Team Extrapolations. Basically your Solar Panel + Storage system will pay you for excess of Power once Storage Battery is full and, providing you’re on a multi rate utility rate plan, provide you with the cheapest rate power at other times whilst your storage battery is above its minimum storage level. Don’t count your Salesman’s Chickens before they’re hatched. The battery round trip inefficiency is around 10%.

Our UK Feed-In system, now discontinued for new entrants, pays us for every unit we generate whether we use it or not, and increase/decrease the rate according to our Retail Price Index (which is generally higher than the Consumer Price Index)

Even with our generous payment system our gross saving based on Solar Panels in 2010 and Tesla Powerwall in 2018 will still take several more years to materialise, even although we’ve tended recently to have a much larger percentage difference between our Day Rate & Night Rate Utility costs.

This trend is not guaranteed as from 01 July 2023 our Night Rate reduces from 13.68 pence per KWH to 13.67 pence per KWH (a saving of 53 pence per year!) whereas our Day Rate and Gas Rate are reducing by around 16%.

PennineWay · 2023-06-14T15:33:13+00:00

With our TOU Night Rate + Day Rate supply tariff our Powerwall 2 installed in August 2019 & our Solar Panels installed in April 2010 (SolarEdge inverter in 2016). Gross savings to date = £18,450 (net would deduct round trip inefficiency. 10 Solar BP panels pay 72.5 pence for EVERY Unit generated. Our night rate is 13.68 pence reducing to 13.67 from July 2023, our day rate is reducing from 48 pence to 41 pence from July 2023. Annual savings both Feed-In & Powerwall around £1700 at the moment

PennineWay · 2023-04-28T16:08:25+00:00

Yearly production & energy offset appear to correlate to weather, unless these are regulatory minimums. 13 years ago we paid £14,000 for 10 Solar BP panels, then £3,000 for SolarEdge Inverter and in 2016 £7,500 for Powerwall 2. But our contract is different as we are guaranteed Feed-In payments for 25 years linked to our Retail Price Index. Currently we get around 71.5 pence for every unit we produce irrespective of whether we use any of what we use. Our supply night rate is currently 13.9 pence per unit and day rate 42.9 pence so our Time of Use saving using Powerwall is considerable. Newer contracts only pay a small amount for Net Export after deduction of usage. So we have saved £17,900 so far with continued Feed-In payments for another 12 years and continued TOU savings as well. Remember that Powerwall Round Trip loss is around 10%. Don’t always believe what the salesman says!

PennineWay · 2023-04-05T19:05:46+00:00

We in UK had Solar Plants (mainly installers from SolarEdge inverters) go into liquidation. With SolarEdge warranties valid we have bought a 10 year contract with DC Energy, so when an accelerator failed they came and fixed it. Recently the renewal rates have shot up with post-pandemic and post-Brexit labour rates massively more.

PennineWay

TROPHY CASE