Site changelog
Every change to this site is listed here, newest first: what changed, the date it changed, and the reason. When a number moves, this page is where you find out why.
Quick answer
This page records content and data changes, not marketing updates. If a calculator assumption, a wattage figure or a recommendation changes, an entry appears here on the same day. Corrections are logged rather than quietly edited.
Why this page exists
Most sites change quietly: a number is adjusted and nothing records it. That is convenient for the publisher and useless for the reader who based a purchase on the earlier version.
A changelog puts the movement on the record: if a figure came from a manufacturer sheet, the entry says when we read it.
The calculators rest on assumptions such as depth of discharge and sun hours; when one changes, every result shifts, so readers deserve the date.
How to read an entry
Each entry has three parts: the date, the thing that changed, and the reason. A change with no reason is not an entry, it is an edit we have not finished explaining.
Where a change makes an earlier page wrong, that page is corrected on the same day and the correction is named here rather than folded into a date at the foot of the page.
2026-11-02 to 2026-11-07
| What changed | Why |
|---|---|
| Corrected the appliance count, five page dates and the sources wording | Four pages still said 45 appliances after the table grew to 150; five pages carried a next-day date. |
| Published the home backup comparison | The axis is survive versus sustain: which pairings hold up day after day. |
| Published a guide on what a balcony kit contains | Box contents, the wall circuit limit, real output on a balcony, and how to read certification claims. |
| Published the sun hours table | Annual, winter and summer figures for one city per state. |
| Published the appliance wattage table, expanded from 45 to 150 entries | Running watts, starting watts and hours a day, each row labeled cited or scaled. |
| Published the method page | How each figure is produced, which inputs are estimates, and how corrections are published rather than made silently. |
| Published two guides: adding storage, and how the chain works end to end | The first explains the three architectures that can hold energy and why bolting storage onto an existing array is usually not one; the second follows the energy from panel to meter and says it stops in an outage. |
| Published the power station match calculator | It turns a backup load into three limits - capacity, continuous output and startup surge - and names the smallest unit in our data that clears them. |
| Published the unit converter for watts, watt hours, amp hours and BTU | It shows why amp hours need a voltage before they mean anything, and why a cooling rating quoted in BTU is not a wattage. |
| Published the charge controller sizing calculator | It converts array watts and bank voltage into the amp rating to buy, including the continuous-current margin that keeps it honest on a cold bright morning. |
| Published the comparison between panels and a portable power station | It prices both routes on the same axes and states plainly that an array linked to the grid provides no backup hours during an outage. |
| Published the battery sizing calculator for a fixed array | It works from what the panels make rather than from the load, and reports the share of the array the charger can actually accept. |
| Published the refrigerator runtime calculator page | It separates whether a station can start a fridge from how many days it runs, and puts the four-hour food safety window next to the runtime so the two are not confused. |
| Published the storage sizing calculator page | It answers how much battery a given daily load needs across one to three nights, and where that stops fitting in a single 120 V unit. |
| Published the affiliate disclosure page in full | The earlier draft was short of the length and detail a disclosure needs to be useful. Rewritten and expanded. |
| Published the privacy policy | Needed before any page with outbound commercial links goes live. |
| Home page load example fixed at 2,160 Wh per day with a 755 W surge | The four default appliances are now stated on the page so the figure can be recomputed by hand. |
| Dropped the planned battery-buffered balcony list | After checking what is actually sold and certified for a 120 V outlet, only one system qualifies. A list page with one product helps nobody, so the question moved to a guide instead. |
| First batch of pages reduced from twenty to nineteen | A consequence of the line above, not a change of ambition. |
| Built an internal product table of 42 candidates | So that every recommendation traces to a model number and a source rather than to memory. |
2026-11-01
| What changed | Why |
|---|---|
| Published the load calculator page | It defines the three numbers every other page depends on: daily energy, running watts and startup surge. |
| standardized surge as peak plus the sum of each motor's extra draw | Taking only the largest motor understates a house with two compressors. The additive method is the one the reference material describes. |
| Set the site typography and layout | Small labels at 12 px minimum, body text at 16 px, one column of text at a fixed measure so long numbers stay readable on a phone. |
Corrections and retractions
No correction has been published yet, because the site is new. That is not a boast, it is a starting position, and it will not stay true.
A correction keeps the new figure on the page and records both values here with the date. We do not delete the history of a wrong number: a reader who quoted it deserves to see it withdrawn.
If a claim rests on one source that others contradict, we stop asserting it. The entries above show that: a certification requirement was downgraded after checking what manufacturers sell.
Questions people ask
How often is this page updated?
On the same day as the change it records. There is no monthly roundup, because a roundup is how changes get lost.
Does a missing entry mean nothing changed?
It should. If you find a page that differs from what this log says, that is a bug worth reporting.
Why do some entries mention internal work?
Because the internal work is what decides the numbers. A product table or a data check changes what a calculator recommends, so it belongs on the record.
Do you log design changes?
Only when they change what a reader can find or read. A color adjustment is not a content change and does not get an entry.
Can I see earlier versions of a page?
Not yet. The log is the record for now; archived page versions are a later addition.
How far back this goes
The log starts on 2026-11-01, the day the first page was published. Nothing before that is lost, it simply was not public yet.
Two pages describe method rather than history: the disclosure page covers how the site earns money, and the load calculator covers the arithmetic.
The rules behind these entries, and how the figures on each page are produced, are described on the method page.
- Federal Trade Commission, Endorsement Guides — the reason a correction has to be public rather than silent. Read 2026-11-02.
- Google Search Central, Search Essentials — on keeping a site's published content useful and current. Read 2026-11-02.
- US Department of Energy, Estimating Appliance and Home Electronic Energy Use — the method behind the additive surge figure logged above. Read 2026-11-02.