EnergyMeterHub Tool Details
Battery Size Estimator
Use this battery size estimator when you want to get into the right battery size band before you compare specific battery brands, chemistry choices, or installer quotes. It is designed to answer the homeowner question first: what size range should I even be looking at?
Planning
First-party
Estimate a practical starting home battery size from your evening usage, backup expectations, and self-consumption goals.
What this tool is for
Who this tool is for
Homeowners who want to get into the right battery size band before they compare specific battery brands or installer quotes.
What this tool now expresses more clearly
It still starts from evening use, backup expectation, and solar export behavior, but it now gives a better planning split between usable target, likely nominal range, and the kind of power expectation that matters when backup becomes more serious.
How to use the output
Use the result as a planning band, not a precise product recommendation. Backup scope, inverter compatibility, and staged expansion can still move the final system design.
Why this tool is worth using
- Gets homeowners into a sensible battery size band before brand comparison starts.
- Works even when the user does not know their evening kWh exactly.
- Now separates the conversation into usable energy, likely nominal capacity, and rough power expectation so battery sizing feels less misleading than a single kWh number.
How to use it well
Use known evening data when possible
The strongest results come from a rough evening-use number after solar production fades, not from total household consumption over the whole day.
Treat backup and power as separate questions
A battery can have enough energy on paper but still disappoint if the backup expectation or critical-load power is bigger than the system can comfortably support.
Examples
Example
A household sizing only for bill shifting often lands in a much smaller band than a household that also wants meaningful overnight backup and a higher critical-load expectation.
What this tool does not replace
What this tool does not replace
It does not replace final inverter compatibility checks, backup wiring scope, or a detailed installer-level battery design.
How to continue
Open the tool when you know the question you are trying to answer
Use the interactive version once you know what inputs matter and what kind of answer you are expecting from it.
Use the result as guidance, not a final purchase promise
These pages are designed to make the tool easier to use correctly, but you should still validate important hardware, tariff, and compatibility decisions before buying.