[{"data":1,"prerenderedAt":85},["ShallowReactive",2],{"example-cycle-life-cost-en":3,"faq-cycle-life-cost-en":47,"sources-cycle-life-cost-en":81},{"input":4,"output":14},{"cycleCountLow":5,"cycleCountHigh":6,"ratedCapacityAh":7,"nominalVoltageV":8,"acquisitionCost":9,"cycleCount":10,"cycleCountAtDoD":11,"calendarLifeYears":12,"cyclesPerYear":13},2500,4500,100,12.8,160,3500,0.8,15,250,{"throughputKwh":15,"costPerKwh":16,"lifetimeYears":17,"effectiveCycles":10,"bindingConstraint":18,"costPerKwhRange":19,"throughputKwhRange":22,"costCtPerKwh":25,"annualThroughputKwh":26,"acquisitionCost":9,"steps":27,"warnings":37},3368.96,0.04749240121580547,14,"cycles",[20,21],0.044326241134751775,0.06648936170212766,[23,24],2406.4,3609.6,4.749240121580547,240.64000000000001,[28,33],{"label":29,"expression":30,"value":15,"unit":31,"provenance":32},"throughput","C * U * DoD * N * eta_rt \u002F 1000","kWh","exact",{"label":34,"expression":35,"value":16,"unit":36,"provenance":32},"costPerKwh","C_capex \u002F E_throughput","Waehrung\u002FkWh",[38],{"level":39,"code":40,"params":41,"anchors":45},"info","ACQUISITION_VS_MARKET",{"low":42,"high":43,"position":44},120,200,"inside",[46],"acquisitionCost",[48,51,54,57,60,63,66,69,72,75,78],{"q":49,"a":50},"How do I work out what my battery really costs per kilowatt-hour?","Divide the purchase price by lifetime energy throughput: capacity times voltage times depth of discharge times cycle count times round-trip efficiency. Throughput is the only unit in which batteries can be compared fairly — 3,000 cycles at 100 percent DoD and 6,000 cycles at 50 percent deliver exactly the same throughput, so the apparent doubling of life is no such thing.",{"q":52,"a":53},"Why does the calculator insist on a cycle count and its depth of discharge from the datasheet?","Because manufacturer cycle figures differ by a factor of five to six, the calculator refuses to guess this number. The depth of discharge the cycle rating refers to is mandatory — without it the figure is meaningless. If the rating is uncertain you can enter a range and get a cost band instead of a single value.",{"q":55,"a":56},"What if I only cycle the battery occasionally?","Then calendar life becomes the binding limit rather than the cycle rating: a cabin battery at 60 cycles a year would need 58 years to reach 3,500 cycles, and the calculator flags this. Capacity fade over life, temperature effects on ageing and residual value are not modelled.",{"q":58,"a":59},"What does a LiFePO₄ battery cost per kilowatt-hour, concretely — and how does it beat AGM?","In the reference case (100 Ah \u002F 12.8 V, €160 market mean 08\u002F2026, 3,500 cycles at 80 % DoD, η = 0.94) the throughput is 3,369 kWh — 4.75 ct per kilowatt-hour cycled, with a cycle-limited lifetime of 14 years. A brand unit at €800 lands at 23.7 ct on the same datasheet values — the premium buys warranty, service and vetted cells, not different cycles. Exactly why the market-range reference sits beside your price.",{"q":61,"a":62},"When does the result flip in favour of the cheaper purchase?","At low usage. A garden shed with 60 cycles per year reaches 3,500 cycles only after 58 years — the battery dies of calendar ageing long before, and the throughput shrinks accordingly. That is exactly the cross-check this calculator runs: it takes the minimum of cycle and calendar limits and reports when the calendar limit binds. Then the cheap AGM can indeed be the more economical choice.",{"q":64,"a":65},"Why does the calculator show a band instead of one number?","Because cycle ratings vary by a factor of 6 between manufacturers — depending on test standard, end-of-life criterion (70 or 80% residual capacity) and cycle definition. With plausible lower and upper bounds (advanced assumptions) the calculator computes the cost span; in the reference case 22.2 to 33.2 ct\u002FkWh. If the span exceeds the difference between two candidates, that is the honest answer: the data does not support a decision.",{"q":67,"a":68},"Where does the market range beside my price come from?","From the quarterly maintained dataset of the chemistry comparison: for the 100 Ah LiFePO4 class, retail prices in August 2026 ranged from €119 to €196. The range is a reference, not a calculation input — the maths always uses your price. Above it is not an error but a brand premium; below it, cell quality and warranty deserve a look.",{"q":70,"a":71},"Why does the reference not appear for 24 and 48 V blocks?","Because the sample only covers the 12 V block class. A range for voltages nobody sampled would be a claim — the calculator omits the reference rather than extrapolating it. Your price and datasheet values work independently at any voltage.",{"q":73,"a":74},"Did the LiFePO4 price drop change the conclusion?","Substantially. At the €160 market mean, a cycled kilowatt-hour costs 4.75 ct — for context, the spread between grid purchase and feed-in is around 23 ct. Storage itself is no longer the economic bottleneck; what matters is whether there is enough surplus to shift. The storage calculator checks that against your load profile.",{"q":76,"a":77},"What does “cycle-limited” versus “calendar-limited” mean?","Lifetime ends at the earlier of the two limits: cycles used up or calendar years over. In the reference case 3,500 cycles at 250 per year are reached after 14 years — one year before the 15-year calendar limit. At only 150 cycles per year you die by calendar: cycles remain unused, and paying for a higher cycle count does not pay off.",{"q":79,"a":80},"Does the calculation apply to used or second-life batteries?","With caution. The calculator assumes datasheet cycles from new; a used cell has consumed part of them and keeps ageing calendrically. If you know the remaining cycle value from a capacity test, enter it — the market-range reference then does not apply, since it reflects new prices.",[82],{"name":83,"url":-1,"retrievedAt":84,"version":-1},"Manufacturer datasheets (Victron, Fronius, BYD) and IEC 61427-1, aggregated","2026-06-15",1786101752197]