In quanti anni si ripaga una batteria di accumulo?

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border:1px solid var(--mt-border); border-radius:12px; padding:16px; margin-top:20px;}#mt-se9fv .mt-chart-title{ font:var(--mt-h3); color:var(--mt-text); margin:0 0 12px;}#mt-se9fv .mt-chart-legend{ display:flex;gap:16px;flex-wrap:wrap; font:400 12px/1.4 var(--mt-font); color:var(--mt-text-muted); margin-bottom:8px;}#mt-se9fv .mt-legend-dot{ display:inline-block;width:10px;height:10px; border-radius:50%;margin-right:4px;vertical-align:middle;}#mt-se9fv svg{display:block;width:100%;overflow:visible;}#mt-se9fv .mt-disclaimer{ font:400 11px/1.5 var(--mt-font); color:var(--mt-text-muted); margin-top:16px; padding-top:12px; border-top:1px solid var(--mt-border);}/* info affordance */#mt-se9fv .mt-info-wrap{position:relative;display:inline-flex;}#mt-se9fv .mt-info{ display:inline-flex;align-items:center;justify-content:center; position:relative; width:18px;height:18px;min-width:18px; padding:0;margin:0; border-radius:50%; border:1px solid var(--mt-border); background:var(--mt-surface-2); color:var(--mt-text-muted); font:700 11px/1 var(--mt-font); font-style:italic; cursor:pointer; flex-shrink:0;}#mt-se9fv .mt-info::before{content:"";position:absolute;inset:-13px;}#mt-se9fv .mt-info:hover,#mt-se9fv .mt-info[aria-expanded="true"]{background:var(--mt-primary);color:#fff;border-color:var(--mt-primary);}#mt-se9fv .mt-info:focus-visible{outline:2px solid var(--mt-accent);outline-offset:2px;}#mt-se9fv .mt-info-pop{ position:absolute;z-index:5; top:calc(100% + 8px);left:0; width:max-content;max-width:240px; padding:8px 10px; border-radius:8px; background:var(--mt-text); color:#fff; font:400 12px/1.45 var(--mt-font); box-shadow:var(--mt-shadow-card);}#mt-se9fv .mt-info-pop[hidden]{display:none;}@media(max-width:480px){#mt-se9fv .mt-info-pop{max-width:200px;}}@media(prefers-reduced-motion:reduce){ #mt-se9fv *{transition:none!important;animation:none!important;}} Calcolatore payback accumulo fotovoltaico Stima il ritorno dell'investimento in una batteria LFP — con e senza Bonus Ristrutturazione 50%. Potenza impianto FV Consumo annuo Capacità batteria Costo batteria (chiavi in mano) Prezzo energia acquistata Bonus Ristrutturazione applicabile 50% (abitazione principale) 36% (seconda casa / altri immobili) Nessun bonus Produzione FV annua stimata Surplus ceduto alla rete (senza batteria) kWh aggiuntivi autoconsumati Risparmio annuo incrementale Costo netto dopo detrazione Tempo di ritorno Risparmio cumulato vs. investimento (15 anni) 0 – – – – 0 3 6 9 12 15 Anni Stima indicativa — non un preventivo. I risultati dipendono da irraggiamento locale, profilo di consumo, tariffe e condizioni di fornitura effettive. La detrazione IRPEF si applica solo se sussistono i requisiti di legge; consulta un tecnico abilitato. Costanti: rendimento specifico medio nazionale 1.150 kWh/kWp/yr (PVGIS 2026-Q1).(function(){ /* ── COSTANTI ── */ var YIELD = 1150; var SC_NO_BAT = 0.30; var SC_TARGET = 0.90; var DOD = 0.90; var EFF = 0.95; var BAT_LIFE = 25; /* ── ROOT ── */ var root = document.getElementById('mt-se9fv'); if(!root) return; /* ── REFS INPUTS ── */ var inKwp = root.querySelector('#mt-se9fv-kwp'); var inConsumo= root.querySelector('#mt-se9fv-consumo'); var inBat = root.querySelector('#mt-se9fv-bat'); var inCosto = root.querySelector('#mt-se9fv-costo'); var inPrezzo = root.querySelector('#mt-se9fv-prezzo'); var inBonus = root.querySelector('#mt-se9fv-bonus'); /* ── REFS DISPLAY ── */ var dKwp = root.querySelector('#mt-se9fv-kwp-val'); var dConsumo= root.querySelector('#mt-se9fv-consumo-val'); var dBat = root.querySelector('#mt-se9fv-bat-val'); var dPrezzo = root.querySelector('#mt-se9fv-prezzo-val'); /* ── REFS OUTPUTS ── */ var oProd = root.querySelector('#mt-se9fv-o-prod'); var oSurp = root.querySelector('#mt-se9fv-o-surp'); var oKwh = root.querySelector('#mt-se9fv-o-kwh'); var oRisp = root.querySelector('#mt-se9fv-o-risp'); var oNetto = root.querySelector('#mt-se9fv-o-netto'); var oPb = root.querySelector('#mt-se9fv-o-pb'); /* ── REFS CHART ── */ var svgEl = root.querySelector('#mt-se9fv-svg'); var lineBonus = root.querySelector('#mt-se9fv-line-bonus'); var lineFull = root.querySelector('#mt-se9fv-line-full'); var costLine = root.querySelector('#mt-se9fv-costline'); var crossBonus = root.querySelector('#mt-se9fv-cross-bonus'); var crossFull = root.querySelector('#mt-se9fv-cross-full'); var pbLabelBonus = root.querySelector('#mt-se9fv-pb-label-bonus'); var pbLabelFull = root.querySelector('#mt-se9fv-pb-label-full'); var yLabels = [ root.querySelector('#mt-se9fv-y0'), root.querySelector('#mt-se9fv-y1'), root.querySelector('#mt-se9fv-y2'), root.querySelector('#mt-se9fv-y3'), root.querySelector('#mt-se9fv-y4') ]; /* ── CHART GEOMETRY ── */ var CX0=40, CX1=508, CY0=170, CY1=8; /* left, right, bottom, top */ var YEARS=15; /* ── HELPERS ── */ function fmt(n,dec){ dec = dec || 0; return n.toLocaleString('it-IT',{minimumFractionDigits:dec,maximumFractionDigits:dec}); } function clamp(v,mn,mx){return Math.max(mn,Math.min(mx,v));} function setSliderPct(el){ var mn=parseFloat(el.min),mx=parseFloat(el.max),v=parseFloat(el.value); var pct=((v-mn)/(mx-mn)*100).toFixed(1)+'%'; el.style.setProperty('--pct',pct); } /* ── COMPUTE ── */ function compute(){ var kwp = parseFloat(inKwp.value)||6; var consumo = parseFloat(inConsumo.value)||4500; var cap = parseFloat(inBat.value)||10; var costo = parseFloat(inCosto.value)||7000; var prezzo = parseFloat(inPrezzo.value)||0.25; var bonus = parseFloat(inBonus.value)||0; /* formula faithful to brief */ var prod_annua = kwp * YIELD; var surplus = prod_annua * (1 - SC_NO_BAT); var kwh_rec = Math.min(cap * DOD * EFF * 365, surplus, consumo * (SC_TARGET - SC_NO_BAT)); kwh_rec = Math.max(0, kwh_rec); var risp_annuo = kwh_rec * prezzo; var costo_netto = costo * (1 - bonus); var pb_anni = (risp_annuo > 0) ? costo_netto / risp_annuo : Infinity; /* full-price payback (no bonus) */ var pb_full = (risp_annuo > 0) ? costo / risp_annuo : Infinity; var costo_bonus = costo_netto; /* alias for chart */ /* display values */ dKwp.textContent = fmt(kwp,kwp%1===0?0:1)+' kWp'; dConsumo.textContent= fmt(consumo)+' kWh/anno'; dBat.textContent = fmt(cap,cap%1===0?0:1)+' kWh'; dPrezzo.textContent = '0,'+Math.round(prezzo*100)+' €/kWh'; oProd.textContent = fmt(Math.round(prod_annua)); oSurp.textContent = fmt(Math.round(surplus)); oKwh.textContent = fmt(Math.round(kwh_rec)); oRisp.textContent = fmt(Math.round(risp_annuo)); oNetto.textContent = fmt(Math.round(costo_netto)); if(!isFinite(pb_anni)||pb_anni>50){ oPb.textContent = '> 25'; } else { oPb.textContent = '≈ '+fmt(pb_anni,1); } /* slider pct fill */ setSliderPct(inKwp); setSliderPct(inConsumo); setSliderPct(inBat); setSliderPct(inPrezzo); /* chart update */ updateChart(risp_annuo, costo_bonus, costo, pb_anni, pb_full); } /* ── CHART UPDATE ── */ function updateChart(rispAnnuo, costoBonus, costoFull, pbBonus, pbFull){ var W = CX1 - CX0; var H = CY0 - CY1; /* 162 */ var dx = W / YEARS; /* build cumulative arrays (net = cumSavings - cost at yr 0) */ var cumBonus = [], cumFull = []; for(var i=0; i<=YEARS; i++){ cumBonus.push(rispAnnuo * i - costoBonus); cumFull.push(rispAnnuo * i - costoFull); } /* scale: find range */ var allVals = cumBonus.concat(cumFull).concat([0]); var minV = Math.min.apply(null, allVals); var maxV = Math.max.apply(null, allVals); if(maxV === minV){ maxV = minV + 1000; } /* pad */ var pad = (maxV - minV) * 0.08; minV -= pad; maxV += pad; function toSY(v){ return CY0 - ((v - minV) / (maxV - minV)) * H; } function toSX(i){ return CX0 + (i / YEARS) * W; } /* build points strings */ var ptBonus='', ptFull=''; for(var j=0; j<=YEARS; j++){ ptBonus += toSX(j).toFixed(1)+','+toSY(cumBonus[j]).toFixed(1)+' '; ptFull += toSX(j).toFixed(1)+','+toSY(cumFull[j]).toFixed(1)+' '; } lineBonus.setAttribute('points', ptBonus.trim()); lineFull.setAttribute('points', ptFull.trim()); /* cost line (zero reference = cumSavings - cost; horizontal at y of 0) */ var y0 = toSY(0); y0 = clamp(y0, CY1, CY0); costLine.setAttribute('y1', y0.toFixed(1)); costLine.setAttribute('y2', y0.toFixed(1)); /* y-axis labels (4 ticks + 0) */ var step = (maxV - minV) / 4; var tickVals = [minV, minV+step, minV+2*step, minV+3*step, maxV]; var tickYs = [CY0, CY0-H/4, CY0-H/2, CY0-3*H/4, CY1+4]; /* labels: y4=top (maxV), y0=bottom (minV) */ for(var k=0; k<5; k++){ var tv = tickVals[k]; var label = (Math.abs(tv)<1000) ? fmt(Math.round(tv)) : fmt(Math.round(tv/100)*100); yLabels[k].textContent = (tv>=0?'':'')+label; yLabels[k].setAttribute('y', tickYs[4-k].toFixed(1)); } /* crosshair: bonus */ placeCross(pbBonus, rispAnnuo, costoBonus, costoFull, toSX, toSY, crossBonus, pbLabelBonus, 'bonus', YEARS); placeCross(pbFull, rispAnnuo, costoBonus, costoFull, toSX, toSY, crossFull, pbLabelFull, 'full', YEARS); } function placeCross(pb, risp, costoBonus, costoFull, toSX, toSY, circle, label, which, YEARS){ if(!isFinite(pb)||pb>YEARS+0.5){ circle.setAttribute('cx','-100'); circle.setAttribute('cy','-100'); label.setAttribute('x','-100'); label.setAttribute('y','-100'); label.textContent=''; return; } var x = toSX(Math.min(pb, YEARS)); var cumAtPb = risp * pb - (which==='bonus' ? costoBonus : costoFull); var y = toSY(0); /* crosshair at zero line */ y = clamp(y, CY1+2, CY0-2); circle.setAttribute('cx', x.toFixed(1)); circle.setAttribute('cy', y.toFixed(1)); var ly = y - 8; if(ly < CY1+12) ly = y + 16; label.setAttribute('x', x.toFixed(1)); label.setAttribute('y', ly.toFixed(1)); label.textContent = '≈'+Math.round(pb)+'a'; void cumAtPb; /* used above in calc, suppress lint */ } /* ── INFO TOOLTIPS ── */ root.querySelectorAll('.mt-info').forEach(function(btn){ var pop = root.querySelector('#'+btn.getAttribute('aria-describedby')); if(!pop) return; btn.addEventListener('click', function(e){ e.stopPropagation(); var open = btn.getAttribute('aria-expanded')==='true'; root.querySelectorAll('.mt-info[aria-expanded="true"]').forEach(function(o){ o.setAttribute('aria-expanded','false'); var p = root.querySelector('#'+o.getAttribute('aria-describedby')); if(p) p.hidden=true; }); btn.setAttribute('aria-expanded', String(!open)); pop.hidden = open; }); }); document.addEventListener('click', function(){ root.querySelectorAll('.mt-info[aria-expanded="true"]').forEach(function(o){ o.setAttribute('aria-expanded','false'); var p = root.querySelector('#'+o.getAttribute('aria-describedby')); if(p) p.hidden=true; }); }); root.addEventListener('keydown', function(e){ if(e.key==='Escape'){ root.querySelectorAll('.mt-info[aria-expanded="true"]').forEach(function(o){ o.setAttribute('aria-expanded','false'); var p = root.querySelector('#'+o.getAttribute('aria-describedby')); if(p) p.hidden=true; o.focus(); }); } }); /* ── BIND INPUTS ── */ [inKwp, inConsumo, inBat, inCosto, inPrezzo, inBonus].forEach(function(el){ el.addEventListener('input', compute); }); /* ── INIT ── */ compute();})();