{"query": "How long a battery runs a load", "count": 20, "results": [{"id": "card_works_battery", "title": "How long a battery runs a load", "shelf": "the-works", "surface": "secular", "snippet": "A 100 Wh battery driving a 50 W load lasts two hours — energy divided by power. The arithmetic behind every off-grid design.  Worked & sealed by the engine — runtime = 100 Wh / 50 W = 2 h.  [HOLDS; op", "authority_tier": "verified", "source": "The Works — worked & sealed", "generated": false}, {"id": "card_theory_electrochemistry", "title": "Electrochemistry & the battery (Volta, Faraday, and stored charge)", "shelf": "theories", "surface": "secular", "snippet": "Electrochemistry & the battery (Volta, Faraday, and stored charge) — an engine domain that can touch it: chemistry. Calibration: seals — cell voltages, Faraday's laws of electrolysis and Nernst shifts", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "generated": false}, {"id": "card_src_book_58531", "title": "History of the Second Massachusetts Battery (Nims' Battery) of Light Artillery, 1861-1865 — Caroline Elizabeth Whitcomb", "shelf": "gutenberg", "surface": "secular", "snippet": "History of the Second Massachusetts Battery (Nims' Battery) of Light Artillery, 1861-1865, by Caroline Elizabeth Whitcomb. Subjects: United States -- History -- Civil War, 1861-1865 -- Regimental hist", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_word_automobile_battery", "title": "automobile battery", "shelf": "dictionary", "surface": "secular", "snippet": "automobile battery: (noun) a lead-acid storage battery in a motor vehicle; usually a 12-volt battery of six cells; the heart of the car's electrical system — syn: car battery", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_car_battery", "title": "car battery", "shelf": "dictionary", "surface": "secular", "snippet": "car battery: (noun) a lead-acid storage battery in a motor vehicle; usually a 12-volt battery of six cells; the heart of the car's electrical system — syn: automobile battery", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_galvanic_battery", "title": "galvanic battery", "shelf": "dictionary", "surface": "secular", "snippet": "galvanic battery: (noun) battery consisting of a number of voltaic cells arranged in series or parallel — syn: voltaic battery", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_voltaic_battery", "title": "voltaic battery", "shelf": "dictionary", "surface": "secular", "snippet": "voltaic battery: (noun) battery consisting of a number of voltaic cells arranged in series or parallel — syn: galvanic battery", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_book_26455", "title": "A History of Lumsden's Battery, C.S.A. — George Little", "shelf": "gutenberg", "surface": "secular", "snippet": "A History of Lumsden's Battery, C.S.A., by George Little. Subjects: United States -- History -- Civil War, 1861-1865 -- Campaigns; Confederate States of America. Army. Lumsden's Battery; United States", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_word_electric_battery", "title": "electric battery", "shelf": "dictionary", "surface": "secular", "snippet": "electric battery: (noun) a device that produces electricity; may have several primary or secondary cells arranged in parallel or series — syn: battery", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_storage_battery_grid", "title": "storage-battery grid", "shelf": "dictionary", "surface": "secular", "snippet": "storage-battery grid: (noun) a perforated or corrugated metal plate used in a storage battery as a conductor and support for the active material — syn: grid", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_word_lead_acid_battery", "title": "lead-acid battery", "shelf": "dictionary", "surface": "secular", "snippet": "lead-acid battery: (noun) a battery with lead electrodes with dilute sulphuric acid as the electrolyte; each cell generates about 2 volts — syn: lead-acid accumulator", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_power_charge_controller", "title": "The charge controller — protect the battery", "shelf": "energy", "surface": "secular", "snippet": "Never wire a solar panel straight to a battery — a CHARGE CONTROLLER sits between them and regulates the charge so the panel can't overcharge and destroy the battery. Two kinds: PWM is cheap and fine ", "authority_tier": "reference", "source": "U.S. Department of Energy / NREL consumer energy guidance (public domain)", "generated": false}, {"id": "card_src_word_nickel_iron_battery", "title": "nickel-iron battery", "shelf": "dictionary", "surface": "secular", "snippet": "nickel-iron battery: (noun) a storage battery having a nickel oxide cathode and an iron anode with an electrolyte of potassium hydroxide; each cell gives about 1.2 volts — syn: nickel-iron accumulator", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_power_power_budget", "title": "Size the system to your load, not the other way", "shelf": "energy", "surface": "secular", "snippet": "Design from your NEEDS. List each device, its watts, and hours per day: watts × hours = watt-hours/day. Add them up — that daily total is what your system must supply and your battery must store (plus", "authority_tier": "reference", "source": "U.S. Department of Energy / NREL consumer energy guidance (public domain)", "generated": false}, {"id": "card_src_word_battery", "title": "battery", "shelf": "dictionary", "surface": "secular", "snippet": "battery: (noun) group of guns or missile launchers operated together at one place · (noun) a device that produces electricity; may have several primary or secondary cells arranged in parallel or serie", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "generated": false}, {"id": "card_src_book_31887", "title": "Our Battery; Or, The Journal of Company B, 1st O.V.A. — O. P. (Orlando Phelps) Cutter", "shelf": "gutenberg", "surface": "secular", "snippet": "Our Battery; Or, The Journal of Company B, 1st O.V.A., by O. P. (Orlando Phelps) Cutter. Subjects: United States -- History -- Civil War, 1861-1865 -- Regimental histories; United States. Army. Ohio L", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_power_inverter", "title": "The inverter — DC battery to household AC", "shelf": "energy", "surface": "secular", "snippet": "Batteries and solar are DC (12/24/48 V); most household devices want AC (120 V in the US). An INVERTER converts it. Size it to your biggest simultaneous load PLUS surge — motors (fridge, pump, power t", "authority_tier": "reference", "source": "U.S. Department of Energy / NREL consumer energy guidance (public domain)", "generated": false}, {"id": "card_src_book_58833", "title": "Battery D First Rhode Island Light Artillery in the Civil War — George C. Sumner", "shelf": "gutenberg", "surface": "secular", "snippet": "Battery D First Rhode Island Light Artillery in the Civil War, by George C. Sumner. Subjects: United States -- History -- Civil War, 1861-1865 -- Regimental histories; United States. Army. Rhode Islan", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_30822", "title": "Campaign of Battery D, First Rhode Island Light Artillery — Ezra Knight Parker", "shelf": "gutenberg", "surface": "secular", "snippet": "Campaign of Battery D, First Rhode Island Light Artillery, by Ezra Knight Parker. Subjects: United States -- History -- Civil War, 1861-1865 -- Personal narratives; United States -- History -- Civil W", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}, {"id": "card_src_book_32111", "title": "Diary of Battery A, First Regiment Rhode Island Light Artillery — Theodore Reichardt", "shelf": "gutenberg", "surface": "secular", "snippet": "Diary of Battery A, First Regiment Rhode Island Light Artillery, by Theodore Reichardt. Subjects: United States -- History -- Civil War, 1861-1865 -- Regimental histories; Rhode Island -- History -- C", "authority_tier": "reference", "source": "Project Gutenberg (public domain)", "generated": false}]}