4 ms·
Just realized that with a battery intended for seasonal storage you only get one cycle per year so for the same ROI as a battery that cycles weekly or daily it
by ema 5y ago
Just realized that with a battery intended for seasonal storage you only get one cycle per year so for the same ROI as a battery that cycles weekly or daily it has to be much cheaper per kwh of capacity. OTOH it only needs to last for like 50 cycles.
- maxerickson 5y agoI wonder what the napkin math is vs something like methane synthesis.
- telchar 5y agoI think you’re on to something with that. With so few round trip conversions compared to something that is charged/discharged frequently, the conversion efficiency doesn’t matter as much compared to the cost of storage. For a given kwh of storage that is round-tripped daily, a 1% loss of efficiency loses 3.65kwh per year. For a kWh of storage that is round-tripped once per year, you only lose 0.01kwh. At 70% conversion efficiency the yearly storage still loses only 1/10 the energy as a daily system at 99%.
- cupofpython 5y agoI like to imagine a system with the different geothermal-like technologies working together in maybe a layered like structure. Extracting from the winter / summer cycle, the day / night cycle, and the consistent deep ground / surface air temp differential. Granted day / night might not have enough variation to take advantage of in a lot of places - but surely some cool tech has come out of desert areas right?
- jdmichal 5y agoArid locations already enjoy much cheaper cooling via swamp coolers over heat pumps. They're just enough to keep it bearable during the day, then the night comes and clears out all the latent heat.