🏠 Homelab
Akkulaufzeit, Solardimensionierung, Stromverbrauch und Docker-RAM-Rechner für Self-Hosting-Setups
Berechnen Sie, wie lange ein Akku Ihr Gerät versorgt — Ah, Spannung und Watt eingeben
Tool öffnen →Dimensionieren Sie Solarpanel und Batterie für Off-Grid Raspberry Pi und Homelab-Setups
Tool öffnen →Geräte hinzufügen, Gesamtwattleistung, tägliche kWh und jährliche Stromkosten anzeigen
Tool öffnen →Container-Speicher planen — Dienste aus Vorlagen wählen und gegen verfügbaren RAM prüfen
Tool öffnen →Sizing tools for self-hosted infrastructure — the calculations that decide whether a build actually survives contact with reality. How long a battery holds a server up, how much solar you need to run one continuously, what a rack draws from the wall, and how much RAM to give a stack of containers.
These came out of building the things they describe. The numbers they produce are the ones worth checking before you buy hardware, because the failure mode of guessing is either an expensive over-build or a server that dies every time the sun goes behind a cloud.
Which tool do I want?
| If you… | Use |
|---|---|
| You want to know how long a UPS or battery lasts | Akkulaufzeit |
| You are planning an off-grid or solar-backed setup | Solarpanel-Dimensionierung |
| You need total draw and running cost for a rack | Stromverbrauch |
| You are deciding how much RAM a container stack needs | Docker RAM Planer |
Battery capacity is not the number on the label
A 100 Ah lead-acid battery does not give you 100 Ah. Discharging lead-acid below about 50% wrecks its cycle life, so the usable figure is nearer 50 Ah, and that is before inverter losses of 10–15% and the capacity that Peukert's law eats at higher discharge rates. A rule of thumb that has never let me down: take the label figure, halve it for lead-acid, then remove another 15%.
LiFePO4 changes the arithmetic. You can take it down to 20% without meaningful damage, and it holds voltage far more steadily as it drains, so the usable fraction is more like 80%. It costs more per nominal amp-hour and less per usable one, which is the comparison that actually matters.
The other number people miss is idle draw. An inverter running with no load still burns 10–20 W, which is around 0.4 kWh a day doing nothing at all. On a small off-grid system that overhead can exceed what the server itself uses.