Author
Inam Ur Rehman
Product experience lead and frontend architect
Inam Ur Rehman is the person behind KiloHour. He wrote its runtime engine and calculators, keeps the product data current, and writes every product and brand note. Outside KiloHour he leads product experience and frontend architecture work, and he has been designing and shipping web tools for more than ten years.
- Product notes
- 47
- Brand notes
- 6
- Content reviewed
- Building web tools
- 10+ years
Bylines
Notes he wrote
47 model notes and 6 brand introductions, each written and kept current by him. Every note sits on the page it describes, beside the calculator and the sources it cites.
On KiloHour
His part in KiloHour
- The runtime engineThe code that turns rated capacity, inverter losses and idle draw into the runtime ranges and can-it-run verdicts shown on every page.
- The calculatorsThe per-model calculators, the size planner, the solar refill tool and the comparisons, all running on that one engine.
- The product dataAdding models, re-checking them field by field against the maker's pages, and retiring the ones that leave the market.
- The notesWriting each product and brand note, and revising it when the specs underneath it change.
- The data checksThe automated tests that stop a bad value, or a note that contradicts the data, from going live.
He is not a licensed electrician or engineer, and nothing on KiloHour is electrical advice. In place of credentials, the site shows its working: the formula behind each result, a link to the source of every spec, and a label on every assumption. For wiring, transfer switches or medical equipment, follow the manual and ask a qualified professional.
Method
How each kind of number is checked
A runtime estimate is only as good as the numbers fed into it. This is where each kind of number comes from, and what happens when nobody publishes it.
Capacity, output and charging specs
Official product pages and user manuals
Rated capacity, continuous and surge output, solar input, weight and UPS switchover are copied from the maker's own product page or manual. Each field keeps the page it came from and the date it was last checked, a model counts as verified only once its core fields match that page, and anything not re-checked within 180 days is flagged.
Figures a maker does not publish
Left empty on purpose
If the maker gives no number, the field stays empty and the page prints Not published. Nothing is borrowed from a sibling model, a retailer listing or a forum post to fill the gap.
Appliance watts
Appliance spec sheets and DOE-based tables
Each of the 26 appliance presets names its source beside its watts: the maker's spec sheet where there is one, otherwise DOE figures as published by an extension service or a utility's sizing sheet. When no starting surge is published, the calculator uses 3 times running watts and labels it as an assumption.
Model assumptions
Labelled defaults with their reasons
Inverter efficiency, idle draw, usable capacity and solar derating are rarely published, so the engine falls back on 10 documented defaults. Each one states why it was chosen and cites a source where one exists, and every result that leans on one is tagged as an assumption.
The arithmetic and the notes
Automated tests on every build
Golden tests pin the engine to known answers for known inputs. An editorial consistency test reads every note and fails the build when a wattage, surge, solar or switchover figure in the text disagrees with the product data.
Discontinued models
Removed, then redirected
A model that leaves the catalog loses its page, and its address redirects to the nearest current model picked by a fixed rule rather than by hand. 6 old addresses redirect this way today.
The formulas, and every default with its reason, are on the methodology page.
History
Changelog
Changes readers can see, newest first, taken from the site's commit history. Build and hosting fixes are left out.
Published the notes for 15 models and an intro note for each of the six brands, so those pages can be indexed. Added llms-full.txt, a plain-text copy of every indexable page for AI tools.
Took the BLUETTI EB3A and AC2A out of the catalog and pointed their addresses at the closest current models. Each product note now opens with a one-line KiloHour take.
Relaunched as KiloHour, with a calculator page for each model, brand hubs, side-by-side comparisons, the sizing and solar calculators, and sourced appliance presets. Several specs were corrected against official product pages in the same release.
First commit of the site: the runtime engine with its tests, the product data and the first product notes.