# Source notes — checked 5 November 2026

This is a research and calculation site. No MySunSpark hands-on testing was performed or claimed. The original rebuild brief is preserved at [mysunspark-benchmark.md](mysunspark-benchmark.md).

## Verified sources used

- [PowerStation Size device library](https://powerstationsize.com/calculator/): fridge 150 W, 35% duty and 1,200 W surge; router 12 W; LED 9 W; laptop 60 W; TV 100 W; CPAP without heat 45 W and with heat 80 W. Typical examples, not specifications for the visitor's appliances. Hours are explicitly hypothetical planning schedules.
- [Enough Watts fridge guide](https://enoughwatts.com/guides/can-a-power-station-run-a-refrigerator): 54.2 W average profile and the 1,000 Wh × 85% example, about 15.7 hours without reserve. Annual kWh conversion also appears on this page. The runtime-size table is our arithmetic using that profile, not measured runtime.
- [OutdoorGearLab](https://www.outdoorgearlab.com/topics/camping-and-hiking/best-power-station): its narrative reports 60–93% usable AC capacity. Its current page lists 1,710 Wh measured for the Jackery 2000 v2, whereas the brief quoted 1,740 Wh. We omitted that individual measurement rather than reproduce the outdated brief number. These are their tests, not ours.
- [EcoFlow official North American catalogue, PDF page 16](https://websiteoss.ecoflow.com/pdf/BROCHURE-%202023%20Product%20Catalogue.pdf#page=16): DELTA 2 1,024 Wh, 1,800 W AC, 2,700 W surge. Manufacturer catalogue is older; checked on this date, not published on this date. [Current product page](https://www.ecoflow.com/us/delta-2-portable-power-station) supports the solar input limit of 500 W and LiFePO4 chemistry. [Official manual](https://manuals.ecoflow.com/us/product/delta-2-portable-power-station?lang=en_US) search extraction also gave the same capacity/output/surge, but opening it rendered only a JavaScript shell, so the visible catalogue is the stored source.
- [Jackery product specifications](https://www.jackery.com/products/jackery-explorer-1000-v2): North American 1,070 Wh, 1,500 W rated, 3,000 W surge, 400 W maximum solar input. The page also contains other regional variants, so the calculator explicitly identifies its North American examples. [Manufacturer FAQ](https://faq.jackery.com/hc/en-us/articles/52357316078747-What-are-the-differences-among-Explorer-1000-1000-Pro-1000-Plus-and-1000-V2) corroborates ratings and the absence of expansion on this version.
- [FoodSafety.gov](https://www.foodsafety.gov/food-safety-charts/food-safety-during-power-outage): closed refrigerator up to 4 hours without power; item-specific disposal chart for exposure at 40°F / 4°C or above for more than 2 hours. We link the official chart and do not equate calculated runtime with food safety.
- [BalconyVolt](https://balconyvolt.com/en/best-balcony-solar-kits/): describes two 430–450 Wp modules and an 800 W inverter as a common market format. Attributed as a secondary market observation, not local legal permission.
- [Bundesnetzagentur](https://www.bundesnetzagentur.de/DE/Fachthemen/ElektrizitaetundGas/ErneuerbareEnergien/Solaranlagen/Balkon_table.html): German simplified-route criteria include an aggregate 800 VA inverter ceiling, subject to the complete conditions. We do not describe this as a worldwide rule.
- [Verbraucherzentrale](https://www.verbraucherzentrale-bawue.de/wissen/energie/erneuerbare-energien/steckersolar-solarstrom-vom-balkon-direkt-in-die-steckdose-44715): search-index extract identifies VDE-AR-N 4105 and related standards. Direct opening returned 403; the site links it as a reference, not a complete legal determination.
- [European Commission PVGIS](https://re.jrc.ec.europa.eu/pvg_tools/en/): actual location, orientation, tilt and loss inputs for site-specific yield estimates. No invented local annual output is included.

## Unverified or deliberately excluded

- Universal non-fridge startup demand. Preset surge equals running W as an explicitly unverified placeholder; visitors must replace it. No claim that those devices have no startup demand.
- Model-specific idle draw, surge duration and measured inverter efficiency. Idle defaults to zero as an omission; efficiency is editable and labelled as a planning assumption. Manufacturer wattage passes are conditional, not compatibility certifications.
- A universal 35% to 85% self-consumption improvement: found on the secondary source but not independently verified for general use; omitted from the guide and tool defaults.
- Universal panel-weight thresholds, safe railing loads, comparative field-test yields and balcony product rankings: no structural or original test evidence verified; omitted.
- Current exact ENA kit compliance: official Connect Direct page returned an anti-bot challenge. No kit is described as verified compliant; readers are directed to check the live register.
- General UK connection limits, deadlines or battery permissions: not independently verified from an accessible current primary authority; no numeric rule is asserted. The guide gives a checking route, not legal approval.
- Balcony price bands, payback periods, export rates, savings and local yield: not verified for the reader's site; omitted. The tool requires visitor inputs instead.
- Jackery 2000 v2 1,740 Wh from the brief conflicts with the current GearLab page; omitted.
- Brief's laptop 20 W example was not carried across; the opened device library supports 60 W instead. Other alternative preset ranges were not used when the opened source provided a specific different example.

## Assumptions versus claims

The 85% efficiency, 20% unused reserve, daily schedules, solar derate and sun hours are editable assumptions, not verified properties of an appliance, location or product. Worked scenarios are explicitly hypothetical arithmetic. Editorial size-class boundaries are site-defined labels, not sourced industry standards. Links on calculated guide results lead to the published input source or the complete local calculation and assumptions; no calculated output is represented as an observed measurement.

## Scope

Four guides follow the brief outlines and contain 1,200–2,000 words each. The general station-sizing guide uses the existing solar-generator-for-power-outage.html URL. Camping and outage selection share power-station-for-camping.html. Existing backup pages and all other pre-existing files are retained; pre-existing modifications are not reverted. No commit, push or publication is performed.

## Validation and review limits

- Pure calculation tests cover reserve as an unused fraction, efficiency, battery-side idle draw, multi-unit startup events, concurrent background loads plus scheduled flexible loads, solar estimates, inactive devices and rejected invalid inputs.
- JavaScript syntax checks pass. Internal page, script, stylesheet and fragment links pass a static audit; pages have one main heading and a main landmark. Each guide's article body is within the brief's requested word-count range.
- Combined application JavaScript is below 15 KB, well within the brief's target.
- A preview server failed with `listen EPERM`. Chromium failed to start because the sandbox denied a required socket operation. Therefore no claim is made that browser interactions, visual mobile layout, printing or clipboard behaviour were tested end to end. These still need browser QA in an environment that permits a browser/server.