Viewing profile — ziga

Unless you add battery storage, which is increasingly the case: https://pv-magazine-usa.com/2026/02/25/solar-and-storage-to-...

> Oh, and also batteries such as the tesla power wall can only be charged and discharged about 1000 times before they have lost a lot of capacity. Powerwall's cycle life is much be…

Ah, those are wholesale prices. And the form factor will increasingly be prismatic LFP packs, not cylindrical cells. For buying LFP cells, I would start here: https://diysolarforum…

Grid-scale storage (and increasingly EVs) use lithium-iron-phosphate battery cells, which don't require cobalt/nickel/manganese.

https://about.bnef.com/insights/commodities/lithium-ion-batt...

I think 12 years is an underestimate. Lithium-ion batteries will degrade, but they still have usable capacity. There are Tesla Roadsters still going strong, 15 years in. And the ba…

You can't really generalize cycles based on chemistry alone. Battery management and usage matters. But two examples with NCA/NMC chemistry: - The Tesla Powerwall 2 battery warranty…

> It accounts for 20% of California’s renewable energy. That doesn't sound right. It seems to come from Wikipedia with a 2019 date, but even then: The Geysers produced 5,543 GWh in…

We need all the renewables we can get, and I think you can have both -- utility-scale and rooftop. Rooftop solar (and battery storage) just needs to be cost efficient to offset the…

I agree about home batteries being too expensive, hopefully prices will come down with scale. But the part about battery degradation is not true. Tesla Powerwall has a 10 year warr…

Dynamic tariffs (aka real-time or wholesale plans) are becoming more common in the UK an EU. These are usually priced by 30-min periods and announced 24h in advance. More modern ut…

I wanted a better dashboard for my Tesla solar/battery system: https://www.netzeroapp.io/

PVWatts is a good resource to estimate solar production based on location, system size, roof orientation, etc: https://pvwatts.nrel.gov/pvwatts.php

Tesla Powerwall is probably the most commercially successful home battery. It comes with a warranty guaranteeing 70% capacity after 10 years, which is not to say it has a 10 year l…

Lots of variables in sizing a battery system: - Is your goal battery backup or load shifting? - How much backup do you need? - What is your energy usage and peak demand during that…

In case your system is from Tesla: I wrote an app that you can load on a tablet and stare at that energy flow all day :) https://www.netzeroapp.io

The dbt community will frequently run Snowflake, and its SQL engine is very good. https://medium.com/@jthandy/how-compatible-are-redshift-and-...

I had the same problem and built this: https://zigam.github.io/ginkgo/

Also did something similar and generalized it across languages by using Metaphone phonetic encoding (which is biased towards English pronunciation however): https://github.com/ziga…

43% according to NYT (includes residents and workers): https://www.nytimes.com/interactive/2020/us/coronavirus-nurs... 55k+ deaths, 296k+ cases, staggering numbers. Out of a 1.3M n…

> Less than 1% of the US population is confirmed to have contracted the virus CDC estimates based on seroprevalence data that for every case reported there are actually 10 other in…

Imperial College report showing mobility trends explain over 80% of observed variations in transmission: https://www.imperial.ac.uk/media/imperial-college/medicine/m...

> Geeky entrepreneur https://www.linkedin.com/in/bert-hubert-b05452/

https://www.firecalc.com/ is a good retirement calculator.