Earth Notes: Enphase AC Battery Grid-connected Storage in Our UK Home: ReviewUpdated 2021-06-27 15:09 GMT.
Enphase AC Battery Interim Review
(This review will be updated as experience is gained.)
- Reviewed by: Damon Hart-Davis on 2018-08-14.
- Installation was quick and good, seems to manage small loads as promised, Web interface is clear, data is locally accessible to automated tools, expensive by the kWh.
Bought from Eco Partners for £2995 including installation and VAT (and continuing on-line services). The Enphase AC Battery is rated at ~1.1kWh usable capacity (reports 1240Wh at full, 0Wh at empty, as of 2018-08), ~260W maximum charge/discharge power, and the key undocumented minimum supported (ie trigger) load (so maximum 'leakage' import) of 5--15W, which is important where typical loads are small, eg overnight. (Best alternative known is Sonnen 8 or 9 at ~30W; 240W is not untypical.) LiFePO4 (lithium iron phosphate) / LFP (lithium ferrophosphate) chemistry AKA the non-exploding but slightly heavier type of lithium battery.
Size is 390 mm (W) x 325 mm (H) x 220 mm (D) without bracket. 25kg for the battery itself. A modular system allowing multiple battery packs to be added as needed, though would be bulky and expensive to cover typical household spiky loads such as washing machine (~2kW) or kettle (~3kW).
A single "Envoy-S Metered" has to be installed to manage one or more Battery units. The Envoy is small and acts as a hub to connect to the Internet and even serve stats locally. Security might be enhanced if Internet connectivity could be dropped entirely unless required. Envoy can accept details of local time-of-use static tariffs to optimise savings, but apparently not dynamic inputs or my algorithms using data accessible within the Envoy, to improve scheduling and system value.
Provides good live metering of grid import/export in reasonable agreement with supply meters, and also of PV generation.
- Rating: 4.5 out of 5.
Summary Questions and Answers
Does The Enphase AC Battery work?
Yes. It roughly avoids about its capacity in imports (1kWh) each day. It manages to keep almost all our night loads off the grid — ie the sun largely powers our house overnight too — other than after very dark days (mainly winter) when it cannot charge enough.
Will the Enphase AC Battery pay for itself?
No. Avoiding export and then re-import of ~1kWh/day saves ~£35/year net at 2018 FiT and UK retail rates!
Will the Enphase AC Battery help the grid?
Probably. Flows for export and import are being reduced, and the grid is being used as if a battery itself.
Will the Enphase AC Battery save carbon?
Possibly. Round-trip losses through the battery appear comparable to those of the distribution network, and the self-consumption of the Enphase reasonably low.
How does the Enphase AC Battery impress?
It shows very fine control regulating imports/exports to within a few watts either way (typically under 5W) within its range, which is much better than the competition. It is also relatively easy to extract detailed real-time stats from the device locally, to capture and analyse later.
What is the Enphase AC Battery missing?
The ability to integrate it with other 'smart' elements by being able to remotely command it to hoard energy at some times for example. And the ability to absorb even brief high loads such as the kettle (3kW, typically 30--60Wh per use).
2018-07-18: Deposit Down
On 2018-07-18 I put the deposit down for an installation of a single Enphase AC Battery (1.2kWh) plus "Envoy-S Metered" hub. Installation is due early August. So there is stock, and lead-times are refreshingly short.
The deposit was £750.
(Similar lead times of a fortnight or less were given for Sonnen product. In contrast, the last I heard of Tesla Powerwall availability was the end of the year...)
Note that this hardware and installation comes in at £2995 including VAT. Additional batteries ordered at the time would be ~£1500 each, so giving a cost of about £1500 to £3000 per installed kWh with surrounding system. Both the management of the lithium-format batteries and the grid interaction are complex.
(Indicative quotes I had for the Sonnen 9.43 with display and installation were: 2.5kWh ~£4500, 5kWh ~£5600, lead times between 1 and 2 weeks.)
This review includes the installation process, given that I think there are a few tricky factors for my case:
- My system is complicated with two generation meters and two tariffs for a start. This may prevent the device from fully soaking up my generation (unless the data is collected purely to help draw pretty graphs) for which I'd want a fix. However, I found this video for the AC combiner box which suggests all may be OK. (Passing both PV feeds through the one production CT.)
- The claimed low minimum cut-in/import value is key to my purchase; it's really not made clear in the spec sheet.
- I'm concerned about finding somewhere suitable to support 25kg+ of battery.
- My meter box has been left with long tails for years to enable this sort of fitting, but it ain't pretty and it ain't spacious!
- Getting stuff looking tidy is possibly beyond me: I'd rather someone else sweated it!
Cost per kWh (Unit of Energy Stored)
Compare that with the 400Ah@12V of lead-acid gel batteries that on 2011-01-10 cost me £900 including VAT and delivery, ie close to £400 per usable kWh of raw storage. So even though raw wholesale lithium batteries should be able to beat those (old) lead-acid prices by a fair margin, that's not visible at retail at all. The lithium-format batteries will have a longer life and can be pushed harder than the lead-acid.
I'm aiming to allow up to four battery units to be fitted eventually.
The aim of this unit is to absorb background low loads such as fridge/freezer and lighting overnight. For that it is important the precision with which the system can prevent imports from the grid, and the minimum such load that it can handle.
Minimum Trigger Load: The Missing Spec
That rather important piece of information is not in any of the spec sheets other than for the Powerflow Sundial M2/S2 for which it is ~150W. Too high to kick in and handle our typical ~70W fridge/freezer load.
The Sonnen UK technical director confirmed in email a cut-in figure of ~30W for the Sonnen 8.0 and Sonnen 9.43.
In discussions, ecopartnersuk.com suggested that the Enphase AC Battery is capable of something the 1W to 5W range, for charge and discharge. That seems plausible as the charge/discharge power per ~1kWh battery unit is ~250W maximum. Substantially on the basis of this claim I have ordered the Enphase from them to use as a testbed.
2018-08-06: Installation Day
This may be sweaty work: it's due to be 32°C in the shade at 16:00...
The Eco Partners crew arrived in their van ~14:30.
I'm happy to say that the Enphase guys are cheerfully and professionally coping with the complexity of my system, and my awkward small space.
When the Enphase Envoy-S wouldn't talk WiFi to my Technicolour Internet router (a known problem, it seems) they worked round the issue by providing and setting up a WiFi extender. (Another reason to get my RPi3-as-AP done!)
They have done a nice neat job siting the Envoy-S (not enclosed in any outer box) between the consumer unit and the meter box, with a plain white domestic-friendly isolator switch.
By 16:15 the backing plate up for battery was up, Envoy-S was up, and largely plumbed in to power, CTs, etc. Wire run for battery is not yet done.
By ~17:45 everything installed, wired up and commissioned; battery charging!
All round a tidy professional job by a pleasant and helpful crew.
(At the end I was (proudly) shown how almost all the packaging was cardboard that went straight in my recycling bin!)
The balance of the fee was taken on my card just before they left.
I was asked some details to get my on-line account set up, including the schematic, and the direction(s) and inclination of my panels.
I can expect to get access to the on-line account in a couple of days, but it is gathering data in the interim, I am told.
A couple of simple tests to exercise the battery before having access to the full data torrent...
The battery has a little charge (~25% as shipped, some from my PV). The sun is going down so generation is ~500W. The dishwasher is full so I have started an ECO cycle. When the main wash starts, with a demand higher than our PV generation, I'll watch for the house to start importing, and the Enphase battery light to go to blue pulsing to show that it is discharging to try to minimise imports.
The battery is charging nicely in the morning (from ~6am / 05:00Z), briefly switching to discharge as I make a cuppa, with the 3kW kettle demanding more than the available ~1.25kW of PV! Full (solid green indicator LED) by ~1pm (12:00Z).
Night Flow Test
Overnight I'll see if the gross grid flow as seen by the Loop meter drops from its customary 80--90W.
This may not work if the battery is too depleted to cover the load.
It seems that the house was powered from the battery for at least the early part of the evening (TV, lights, etc). The Loop meter also saw a reduced (but not zero) load up to at least midnight, ~20W lower than usually reported. (None of the residual may be real... An interesting symptom is that electricity readings are coming in very infreqently, possibly not even hourly, indicating very little flow to power the Loop sensor transmitter, presumably taken parasitically.) The battery was empty before ~3am.
2018-08-08: I now have access to the Enlighten service.
(See the available published data set.)
The very first "Recent Consumption" data sample that I have downloaded confirms the night consumption rate to be somewhere under 20W. This suggests that the 'other' ~60W that Loop was seeing was indeed false. Phew, fewer vampires than I'd feared!
At the moment I'm not seeing generation or grid/battery flow figures in this interface.
There are various interesting graphical presentations of the data available. I can clearly see 0.8kWh being used by the dishwasher overnight for example, though had to tot up manually the Wh figures per 15 minutes.
Having connected directly over the Envoy's local AP, having enabled it, and fetched the
production.json file, I see all the juicy data I want. But some particular items of interest in one snapshot are:
- Production W: -2.562 (ie some small back feed for meters, etc)?
- Total consumption W: 10.989
- Net consumption W: 13.551 (from grid?)
- Storage W: 55
The minimum supported load does not appear to be exactly 5W, but seems to wander a bit between under ~5W and up to ~15W. The Enphase seems to correctly avoid making any exports.
I've managed to connect to the same page(s) on the Envoy via the local LAN: I'll have to pin its IP address down if I am going to poll it automagically and reliably from the RPi.
But in any case, I'm not letting the best be the enemy of the good. Hurrah! I now have a simple script polling the Envoy-S every 5 minutes to match the cadence of storage reporting, generating gnuplot-parsable log output such as:
20180809T03:15Z consumption.readingTime 1533784500 consumption.net.wNow 3.813 consumption.total.wNow 0.014 production.wNow -3.799 storage.percentFull 40 storage.wNow 10 storage.readingTime 1533784343
(Core idea of polling the Envoy's
/production.json c/o Enphase Envoy-S "Data Scraping": thanks!)
2018-08-09: the installer switched on the features needed for me to see all the data, visible in this screenshot. See the dishwasher running the ECO program starting ~1am.
See the Enlighten public view of this system.
2018-08-11: a day where we were mostly away and so loads were small (~2.2kWh) and only ~0.2kWh was imported. Without the battery maybe 0.5kW+ would have been imported.
2018-08-13: my manual meter readings ~24h apart show 3.1kWh, but the Enphase for the same interval indicates 2.9kWh of imports, via the Web interface. The Enphase interfaces (Web and data) show lifetime values which can be matched over a lomger interval for a better idea of the Enphase's accuracy. And indeed supply meter and Enphase record ~14.2kWh imported since the Enphase was installed 7 days ago. (In the same time 104.1kWh was generated by the PV, and gross consumption was 39.6kWh including storage charging.)
2018-08-15 07:15: PV has just started to generate and stats so far from the Web interface are 40Wh PV generation, 590Wh consumption, ~130Wh imported. So 3/4s of night imports (after midnight) avoided, hurrah!
2018-08-15 08:30: just confirmed that the rather bright status light on the battery module cannot be turned off or down in software, so I may cover ours physically!
2018-08-19: the Envoy has found itself a new address on my LAN, breaking my crude data collection tools! So I'll really have to pin down its IP address. For now I'll continue to play along with the new IP. (The Enlighten data collection appears to have continued uninterrupted.)
It seems that figures in the Enlighten on-line view may be revised several days after the event. Consumption figures for the 16th and 17th were significantly reduced by today (from ~1.7kWh to ~1.4kWh).
2018-08-20: the Envoy has wandered off again to get a new IP address. I suspect my router rather than the Envoy itself.
2018-08-25: the Envoy has wandered off again, so I lose another few hours' data before I see the warning emails and can manually fix things...
2018-08-26: and again...
2018-09-08: the 'net energy' report for August still seems to be being tweaked restropectively.
2419c2419 < 2018-08-31 04:15:00 +0100,0,13,0,4,0,9 --- > 2018-08-31 04:15:00 +0100,0,14,0,4,0,10 2444c2444 < 2018-08-31 10:30:00 +0100,342,60,217,0,66,1 --- > 2018-08-31 10:30:00 +0100,342,59,217,0,67,1 2461c2461 < 2018-08-31 14:45:00 +0100,548,29,517,0,2,0 --- > 2018-08-31 14:45:00 +0100,548,30,517,0,1,0 2463c2463 < 2018-08-31 15:15:00 +0100,587,18,568,0,1,0 --- > 2018-08-31 15:15:00 +0100,587,17,568,0,2,0 2468c2468 < 2018-08-31 16:30:00 +0100,454,43,410,0,1,0 --- > 2018-08-31 16:30:00 +0100,454,42,410,0,2,0 2473c2473 < 2018-08-31 17:45:00 +0100,188,37,122,0,29,0 --- > 2018-08-31 17:45:00 +0100,188,36,122,0,30,0 2491c2491 < 2018-08-31 22:15:00 +0100,0,25,0,3,0,22 --- > 2018-08-31 22:15:00 +0100,0,26,0,3,0,23
Interestingly battery charging from the 6th is recorded at ~26kWh, with discharge at ~21kWh. The latter represents avoided imports. The difference is mainly the self-consumption of the battery itself and losses (not including the Envoy), so ~0.2kWh/d (8--9W). So an effective round-trip efficiency of ~80%. Though that is a little unfair since the battery arrived charged to ~25% and was nearer 50% at midnight on 31st August, so maybe 81% efficient overall!
2018-09-09: today I am running the weekly 'hot' maintenance wash for our dishwasher. The sky has been quite overcast, so guessing a good time to run the dishwasher was tricky, to cover the water heating (>2kWh) parts. Indeed, it was unlikely that I could find any start time when all the consumption would be covered by PV generation. Indeed, as clouds were passing the house was switching between exporting and importing, and here the Enphase provides twice the smoothing effect to the grid than its nameplate rating suggests. As the battery is not full, it absorbs ~260W of any potential exports, then reduces any imports as a cloud passes by (up to) the same amount. 2018-08-27: I adjusted the off-grid storage control system to avoid taking its load off-grid if its state of charge is relatively low and the house is exporting (spilling) to grid, because the AC battery cannot absorb it. This lets the off-grid system recharge faster while there is 'excess' on-grid. This then helps share available energy better between the two storage systems, and help to minimise imports in the evening peak for example. The effect is likely to be small, since the off-grid system has to be struggling while the grid-tied is not. Maybe this could contribute an extra 0.1kWh/d, but its a few lines of new code; no extra hardware. The off-grid storage algorithm continues to take load off-grid when possible at higher priority than this tweak, when grid intensity is high. Thus, first minimising imports (or maximising imports) at times of high grid carbon intensity, then minimising imports and maximising self-consumption overall. (This mechanism should fail 'safe' when the Envoy goes AWOL, reverting to normal behaviour, ie assuming that there are no exports.) For 2018-08-29 with much less off-grid primary-array generation than the previous day, the 'dump' load was kept off grid a little longer after midnight. ~80Wh was displaced from exports to overnight.
2018-08-27: I adjusted the off-grid storage control system to avoid taking its load off-grid if its state of charge is relatively low and the house is exporting (spilling) to grid, because the AC battery cannot absorb it. This lets the off-grid system recharge faster while there is 'excess' on-grid. This then helps share available energy better between the two storage systems, and help to minimise imports in the evening peak for example. The effect is likely to be small, since the off-grid system has to be struggling while the grid-tied is not. Maybe this could contribute an extra 0.1kWh/d, but its a few lines of new code; no extra hardware. The off-grid storage algorithm continues to take load off-grid when possible at higher priority than this tweak, when grid intensity is high. Thus, first minimising imports (or maximising imports) at times of high grid carbon intensity, then minimising imports and maximising self-consumption overall. (This mechanism should fail 'safe' when the Envoy goes AWOL, reverting to normal behaviour, ie assuming that there are no exports.)
For 2018-08-29 with much less off-grid primary-array generation than the previous day, the 'dump' load was kept off grid a little longer after midnight. ~80Wh was displaced from exports to overnight.
Note that over the last few days with us away, so minimal load (not massively higher than the battery capacity ~1.6kWh/d vs 1.1kWh) and significant excess (though variable) PV generation each day, the battery is performing will with ~90% self consumption rather than ~50% for the matching period last year.
2018-08-31: caught the Envoy dropping off the network (top LED is red). Network itself including WiFi is fine. In this case powering off and on the WiFi extender seemed to let the Envoy reconnect immediately, before the extender had finished rebooting... The Enlighten Web interface then showed the 'missing' ~50 minutes' data very quickly also.
As of ~14:00Z the lifetime figures shown on the Envoy's home page were:
- Production: 335kWh
- Consumption (includes storage activity): 79.7kWh
Matching values from
- Production: 335061.214Wh
- Consumption (
- Consumption (
- Reading time: 1535724535 (Fri Aug 31 14:08:55 UTC 2018)
2018-09-01: IP address changed again, losing a little over an hour's data...
The new 's' off-grid code (don't dump if the battery isn't full and the house is exporting/spilling to grid) seems to have helped the battery get to FULL twice in quick succession, even with less than stellar insolation, which is an unexpected bonus.
2018-09-02: connectivity lost again, around noon. Power-cycling the WiFi extender made the (top) connectivity light on the Envoy green again. Finding the IP address and updating cron (etc) remains slow and a pain...
(This fun continues sometimes a few times per day. Not necessarily the Envoy's fault, indeed likely not so.)
2018-09-09: since fixing the IP address that my router hands out to the Envoy (based on its MAC address) other than one glitch likely caused by the WiFi extender, there have not been any further drop-outs. The WiFi extender is now powered off also, saving some juice!
2019-02-23: probably for about the first time this year, with some sunshine yesterday and low demand overnight with the rest of the family away, the house coasted without fully discharging storage by this morning. Therefore we were effectively off-grid most of yesterday and so far today.
2019-07-21: the circuit on which the Enphase sits tripped ~12:00Z, and the Enphase seemed to recover gracefully when power was reconnected.
WiFi (to the new Vigor router) still seems to be a bit flaky, requiring manual reconnection (holding down top button until LED goes red) every few days at times.
Self-consumption, ie (Net - Import) / Net, where Net consumption = Import - Export + Generation, rose from 48% in August 2017 to 72% in August 2018 (~0.5kWh/d reduced imports). The Enphase was only installed on the 6th, and August is a special low-consumption case.
September 2018 roughly halved daily imports compared to September 2017 (1.6kWh/d vs 3.2kWh/h), with self-consumption up to 69% from 37%. Some behaviour change and better PV generation may have helped.
No External Control
One aspiration with this kit was to adjust the charge/discharge conditions, eg to match a dynamic ToU tariff or live carbon intensity.
Via the installers, from Enphase on 2018-11-06, I received the following:
I can imagine what he wants but it's impossible...
Only Envoy and our algorithm can send charge/discharge command to battery. And there is no possibility to set a maximum charge level…
While disappointing it is not entirely astonishing, and it is probably positive from a security point of view, for now.
I sought a quote (including installation) for adding one or two more units on the anniversary of the first installation and received (including VAT):
- 1 x 1.2kWh battery pack £1895
- 2 x 1.2kWh battery pack £3495
2019-10-13: Simulating ToU Pricing
Up until today Enphase has been in "Single Rate" mode which reflects what we are paying.
This allows the battery to charge or discharge whenever needed, and should minimise external flows.
Looking at Octupus Agile ToU pricing, reflecting to some extent real grid demand and costs, I note that it is (for Feb 2017 to Feb 2018) around 10p/kWh for 21h, then around 25p for the 3h from 16:00 to 19:00.
I shall set these prices and times in the Enphase tariff settings noon-ish, to see how the Enphase ACB hoards energy to minimise grid imports 4pm to 7pm. I am having this the same for each day of week and season, and I am not asking the Enphase to charge from the grid at night. (Enabling that to shift some grid imports to the small hours in winter, especially of early-morning flows, may be interesting in future. Enphase seems to recommend its use if there is an early-morning peak.)
(I might apply an algorithm to reserve a certain portion of capacity that can only be discharged between those times. That portion might be something like the ratio of peak to normal p/kWh.)
I expect this to slightly reduce self-consumption, but probably be nicer to the grid, helping reduce peak demand.
None of this may have much effect at this time of year.
2019-10-20: Night Charge Experiment
As a small experiment, because the battery is already empty (before 9pm), and tomorrow looks dull, I've set the Enphase to charge between 03:00 and 03:59 local time. That hour should represent about 25% charge, or ~250Wh.
This has the effect of bringing forward some of our load a little, into minimum GB grid demand and carbon intensity. That reduces the demand ramp-up rate for our house, and the grid, when we get up and start the day.
I'm not intending to run other big loads overnight, such as the dishwasher.
I'm not yet expecting to keep this setting, at least not when I can hope for a moderately good charge most days. Maybe I can add a tiny supplement to GB storage capacity mid-winter. Ideally this would be driven by forecast or residual energy (eg don't charge above 25% from grid ever) and thus could become more "fit and forget" and good to leave in place year-round.
2020-03-26: Battery Round-Trip Efficiency
In the 'new' UI offered in MyEnlighten, there are some more stats available.
In particular I have taken a look at 'lifetime' stats for the battery, ie from early August 2018 to now (late March 2020). These stats show the battery receiving a total of 692.93kWh of 'charge' (though this includes at least some ACB overheads and any trickle charging to avoid damage when 'empty' it seems) and 567.01kWh of discharge.
Crudely, and ignoring overheads of the Envoy unit and all the data processing going on in the 'cloud', this is an overall round-trip efficiency of ~82% (rounded up).
For my lead-acid off-grid system I expect less than that. For example, I see that ~40Wh is typically 'wasted' daily in the necessary topping charge out of ~200Wh cycled through the (failing) battery bank daily at the moment.
This ~18 month sample involves about twice as much 'winter' as 'summer', so this efficiency figure is possibly on the low side for the ACB (AC Battery) unit itself.
Looking at calendar 2019, charge 435.29KWh, discharge 357.82KWh, thus efficiency a slightly higher ~82% (rounded down), which suggests that any winter/summer effect is small. That further implies that losses from the ACB while empty and idle are very small, maybe <1%.
2021-01-25: Charging in the Cold
I am contemplating expanding one or more of the forms of storage I already have (off-grid and grid-coupled) or adding a new one (heat storage).
I joined in the
Solar Together London group-buy process and I have a provisional recommendation of a 4.6kWh battery pack for £3159. I assume the price includes VAT and everything else! The offered battery may be a Amasstore GTX5000, with max discharge power of 3500W (so covering the kettle), and a sustained discharge of 2560W (so covering the oven or washing machine or dishwasher, plus a bit more). Charge rate 2800W. Minimum supported load or spill to grid is unreported. Whether it would play nice in parallel with the Enphase is also not obvious.
An alternative is to expand the Enphase by one or more ~1.2kWh packs. This would make most difference in the shoulder months when the current store completely fills and completely empties each day.
A simple eyeballing of my Enphase daily/monthly graphs suggests that:
- Adding one pack would allow absorption and shifting of significant extra energy, in the shoulder months and winter.
- Adding one or two packs would support more of our larger loads, though still no more than about quatrer of the above key oven / dishwasher / washing machine peaks even with two packs, depending on how the Enphase algorithm balances charge/discharge between units. Because of the I^2R nature of some losses, reductions in these losses would rise from ~25% to ~45% with just one extra.
Each extra pack would add extra 'dead' load all year round, especially in winter when such waste is particularly unhelpful. The wasted energy is outside the thermal envelope of the house too.
A reminder/summary of why behind the meter storage may help:
- Reduced imports: reduce CO2 from total grid generation.
- Increased self-consumption: reduce DNO flow losses (maybe ~5% in GB).
- Avoided peak-time demand: reduce infrastructure sized for peak demand, reduce grid carbon intensity for all users.
- Avoid solar-glut-hours exports, eg around noon.
2021-05-11: Night Charge Improvement Request
I think that I'd like to use the night-charge option in winter to load shift.
But I don't like the fact that it's unconditional, possibly filling up entirely and precluding soaking up local generation on bright days.
I'd like to ask Enphase to add an extra flag to only do the night charge (say) up to a maximum of 50% full or 75% full (ie with an extra tick box). That would broaden its usefullness signficantly.
Could you please pass along a request to Enphase tech to implement before winter an improvement to the ‘night charge’ system which is currently effectively unusable for me.
It could be as simple as a tick box to say “Only charge to a maximum of 50% (or 75%).”
That would then allow space for local microgeneration on bright days.
The failure to do this at the moment has meant that I haven’t been able to loadshift at night in winter as I’ve wanted.
If this fix could happen then I'd probably charge for an hour or two in the wee hours of Nov/Dec/Jan, when 'energy independence' is <30%.
It would be better still if I could make it responsive to actual energy availability (ie wind) on the grid at that time, but...
2021-05-31: 100% Energy Independence
- 16WW Enphase AC Battery and house flows, London UK
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