Volts to eV Calculator

Electron-volts sit at the heart of how solar PV cells, battery cells and electrolyser stacks behave. When a procurement team is comparing supplier datasheets for a rooftop PV array or an on-site battery storage system, the cell-level voltage figures translate directly into a single-electron energy figure that determines real-world capacity and efficiency. Getting the conversion right means the panel data, the inverter specification and the modelled annual yield all line up before a £250k capital decision is signed off.

For commercial battery storage, the difference between LFP, NMC and LTO chemistries shows up first in cell voltage. LFP nominal cells sit around 3.2V, NMC closer to 3.7V, LTO around 2.3V. Those numbers translate into the electron-volt energies that drive cycle life, depth of discharge windows and round-trip efficiency claims in supplier proposals. Energy managers benchmarking quotes for a behind-the-meter BESS use this conversion to sense-check whether the headline kWh and cycle-life numbers in a tender response are physically plausible.

Purely Energy works with manufacturers, retailers and commercial property groups evaluating on-site generation and storage as part of a wider procurement strategy. We help finance directors and sustainability leads model the bill impact, the capacity-market implications and the carbon-reporting (SECR) outcome of a PV or BESS investment alongside the supply contract itself. The result is a single, defensible plan that the board can sign off, rather than three separate vendors each quoting a different metric.