Power Your Roof https://poweryourroof.com/ Rooftop solar and home energy — how panels and batteries actually perform, what a tariff does to the payback, and which efficiency measures earn their cost. en Why the optimum tilt for an array is flatter than people expecthttps://poweryourroof.com/solar/why-the-optimum-tilt-for-an-array-is-flatter-than-people-expect/https://poweryourroof.com/solar/why-the-optimum-tilt-for-an-array-is-flatter-than-people-expect/Wed, 26 Aug 2026 09:00:00 GMTSolar BasicsDaniel OkonkwoThe old rule of setting tilt equal to latitude optimises for one moment in the year, and annual energy prefers something shallower. A shadow on one corner costs far more than one cornerhttps://poweryourroof.com/solar/a-shadow-on-one-corner-costs-far-more-than-one-corner/https://poweryourroof.com/solar/a-shadow-on-one-corner-costs-far-more-than-one-corner/Mon, 24 Aug 2026 09:00:00 GMTSolar BasicsDaniel OkonkwoCells wired in series must all carry the same current, so the darkest cell sets the limit for everything behind it, and bypass diodes blunt that penalty rather than removing it. What standard test conditions measure, and why a roof never provides themhttps://poweryourroof.com/solar/what-standard-test-conditions-measure-and-why-a-roof-never-provides-them/https://poweryourroof.com/solar/what-standard-test-conditions-measure-and-why-a-roof-never-provides-them/Thu, 20 Aug 2026 09:00:00 GMTSolar BasicsArjun NairA panel’s rated wattage is its output at one irradiance, one cell temperature and one atmospheric path, and at least two of those three are almost never true outdoors. Panels degrade, and the first year does not resemble the resthttps://poweryourroof.com/solar/panels-degrade-and-the-first-year-does-not-resemble-the-rest/https://poweryourroof.com/solar/panels-degrade-and-the-first-year-does-not-resemble-the-rest/Wed, 19 Aug 2026 09:00:00 GMTSolar BasicsRadhika IyerOutput falls along two separate curves — a small initial drop in the first weeks of exposure, then a slow and fairly linear decline over decades. Optimisers and microinverters fix different halves of the same problemhttps://poweryourroof.com/solar/optimisers-and-microinverters-fix-different-halves-of-the-same-problem/https://poweryourroof.com/solar/optimisers-and-microinverters-fix-different-halves-of-the-same-problem/Sat, 15 Aug 2026 09:00:00 GMTSolar BasicsDaniel OkonkwoBoth put electronics under every panel and both are sold as a shading remedy, but they split the work between roof and ground in ways that change cost, failure and design freedom. Nameplate capacity and usable capacity are two different numbershttps://poweryourroof.com/batteries/nameplate-capacity-and-usable-capacity-are-two-different-numbers/https://poweryourroof.com/batteries/nameplate-capacity-and-usable-capacity-are-two-different-numbers/Wed, 12 Aug 2026 09:00:00 GMTBatteriesManish TrivediA home battery advertises the energy its cells contain, withholds a reserve you will never touch, and separately limits how fast you may draw on what remains. Depth of discharge is a dial rather than a settinghttps://poweryourroof.com/batteries/depth-of-discharge-is-a-dial-rather-than-a-setting/https://poweryourroof.com/batteries/depth-of-discharge-is-a-dial-rather-than-a-setting/Mon, 10 Aug 2026 09:00:00 GMTBatteriesKabir AnandHow deeply a battery is emptied trades usable energy per cycle against how many cycles it will deliver, and for most home systems the manufacturer has already chosen the position. Round-trip efficiency quietly taxes every unit you storehttps://poweryourroof.com/batteries/round-trip-efficiency-quietly-taxes-every-unit-you-store/https://poweryourroof.com/batteries/round-trip-efficiency-quietly-taxes-every-unit-you-store/Thu, 06 Aug 2026 09:00:00 GMTBatteriesTara MukherjeeEnergy put into a battery and taken out again arrives smaller than it left, and that shortfall sets the minimum price gap at which storing anything makes sense. A battery pays back through the tariff, not through the hardwarehttps://poweryourroof.com/batteries/a-battery-pays-back-through-the-tariff-not-through-the-hardware/https://poweryourroof.com/batteries/a-battery-pays-back-through-the-tariff-not-through-the-hardware/Wed, 05 Aug 2026 09:00:00 GMTBatteriesKabir AnandThe value of a stored unit is the difference between what it would have earned leaving the house and what it saves by never entering it, and that difference is set by pricing rather than by the battery. What a cycle counts, and why warranties measure it two wayshttps://poweryourroof.com/batteries/what-a-cycle-counts-and-why-warranties-measure-it-two-ways/https://poweryourroof.com/batteries/what-a-cycle-counts-and-why-warranties-measure-it-two-ways/Mon, 03 Aug 2026 09:00:00 GMTBatteriesDaniel OkonkwoA warranty may be expressed in years, in cycles or in total energy delivered, and which of those three binds first depends entirely on how hard the battery is worked. Import and export are priced separately, and that changes everythinghttps://poweryourroof.com/bills/import-and-export-are-priced-separately-and-that-changes-everything/https://poweryourroof.com/bills/import-and-export-are-priced-separately-and-that-changes-everything/Thu, 30 Jul 2026 09:00:00 GMTBills & TariffsTara MukherjeeA solar household buys and sells electricity under two unrelated arrangements, and the gap between the two rates decides almost every decision that follows. Time-of-use pricing rewards moving a load rather than shrinking ithttps://poweryourroof.com/bills/time-of-use-pricing-rewards-moving-a-load-rather-than-shrinking-it/https://poweryourroof.com/bills/time-of-use-pricing-rewards-moving-a-load-rather-than-shrinking-it/Sun, 26 Jul 2026 09:00:00 GMTBills & TariffsTara MukherjeeWhen electricity costs different amounts at different hours, the cheapest saving available is often a timer rather than a smaller appliance. An east and west array can beat a south-facing one on the billhttps://poweryourroof.com/bills/an-east-and-west-array-can-beat-a-south-facing-one-on-the-bill/https://poweryourroof.com/bills/an-east-and-west-array-can-beat-a-south-facing-one-on-the-bill/Thu, 23 Jul 2026 09:00:00 GMTBills & TariffsDaniel OkonkwoSplitting panels across two opposite slopes gives up some annual generation and returns a production curve that matches household demand more closely. Standing charges mean cutting usage does not cut the bill proportionallyhttps://poweryourroof.com/bills/standing-charges-mean-cutting-usage-does-not-cut-the-bill-proportionally/https://poweryourroof.com/bills/standing-charges-mean-cutting-usage-does-not-cut-the-bill-proportionally/Wed, 22 Jul 2026 09:00:00 GMTBills & TariffsKabir AnandPart of an energy bill is a fixed daily fee that does not move when consumption does, which changes what a percentage saving is actually worth. Reading a half-hourly consumption profile before buying anythinghttps://poweryourroof.com/bills/reading-a-half-hourly-consumption-profile-before-buying-anything/https://poweryourroof.com/bills/reading-a-half-hourly-consumption-profile-before-buying-anything/Sat, 18 Jul 2026 09:00:00 GMTBills & TariffsKabir AnandThe data a smart meter already collects will tell you more about which energy measure suits your house than any quotation will. What the roof has to carry is mostly wind, not weighthttps://poweryourroof.com/install/what-the-roof-has-to-carry-is-mostly-wind-not-weight/https://poweryourroof.com/install/what-the-roof-has-to-carry-is-mostly-wind-not-weight/Wed, 15 Jul 2026 09:00:00 GMTInstallationTara MukherjeePanels add a modest dead load and a considerable uplift force, and it is the force trying to lift the array off the building that governs the fixings. Every roof penetration is a future leak unless the detail is righthttps://poweryourroof.com/install/every-roof-penetration-is-a-future-leak-unless-the-detail-is-right/https://poweryourroof.com/install/every-roof-penetration-is-a-future-leak-unless-the-detail-is-right/Sat, 11 Jul 2026 09:00:00 GMTInstallationArjun NairMounting an array means passing fixings through the weatherproof layer of a building, and the difference between a good installation and a bad one is almost entirely in how those holes are handled. The inverter is the part most likely to fail firsthttps://poweryourroof.com/install/the-inverter-is-the-part-most-likely-to-fail-first/https://poweryourroof.com/install/the-inverter-is-the-part-most-likely-to-fail-first/Thu, 09 Jul 2026 09:00:00 GMTInstallationDaniel OkonkwoIt performs the most complex job in the system, contains the components with the shortest service life, and it is usually the reason a solar installation stops producing. String length is decided by the coldest morning of the yearhttps://poweryourroof.com/install/string-length-is-decided-by-the-coldest-morning-of-the-year/https://poweryourroof.com/install/string-length-is-decided-by-the-coldest-morning-of-the-year/Sun, 05 Jul 2026 09:00:00 GMTInstallationTara MukherjeeA panel produces its highest voltage when it is cold, so the number of panels that may be wired in series is set by a temperature the site sees only rarely. What actually goes wrong on installation dayhttps://poweryourroof.com/install/what-actually-goes-wrong-on-installation-day/https://poweryourroof.com/install/what-actually-goes-wrong-on-installation-day/Sat, 04 Jul 2026 09:00:00 GMTInstallationKabir AnandMost defects in a domestic solar installation are ordinary workmanship failures, and nearly all of them are visible to someone who knows what to look at.