What are we sizing?
Pick the site type, then start from a scenario or build the load list yourself.
The tool sizes anything from a 1 kW single-room supply up to a 1 MW commercial or industrial plant.
Start from a scenario (optional — you can change everything afterwards)
Build the load list
Set how many of each, how many hours a day it runs, and how important it is during an outage.
Something not in the list?
Add it with its nameplate rating.
Loads
Connected load
Daily energy
How much backup do you need?
Two decisions drive the battery: which loads stay on, and how long they stay on for.
Average hours the grid is down each day. Used for the recharge check.
100 % means the array is sized to cover a full day's energy.
What this means
- Loads kept on
- Backed-up load
- Backup window
- Rough energy needed
The exact figures come from the engine on the next step, which also applies diversity, motor starting current, inverter losses, depth of discharge and ageing allowance.
Hybrid inverter
kW continuous
Driven by . Whole-site backup would need .
Battery storage
kWh nominal
Holds of load for , sized by .
Solar array
kWp
About × modules, yielding .
How these numbers were reached
Every intermediate figure, so the design can be checked rather than trusted.
Total load
- Connected (nameplate) load
- After demand factors
- Diversity (coincidence) factor
- Coincident peak demand
- Worst-case starting demand
- Daily energy
- Annual energy
Backup subset — and above
- Loads in the backup group
- Connected backup load
- Backup peak demand
- Starting surge to ride through
- Average draw over the window
- Energy over
- …at the battery terminals
- Usable fraction planned against
Sized by peak
Sized by motor start
Sized by PV input
Battery recharge time
Load split by priority
Share of daily energy in each backup tier.
Where the energy goes
Daily consumption by category.
Backup draw, hour by hour
Power drawn during the outage window. Loads drop out as they finish their daily running time, which is why the tail is lighter than the first hour.
Equipment combinations
Options from the catalogue that meet the requirement, ranked on fit, cost and unit count.
No catalogue combination satisfies this requirement. Either the system is outside the tool's envelope, or the product catalogue needs entries that cover it.
Usable storage
Runs the backup load for
Materials only — no labour, scaffolding, permits or grid-connection fees. Cable lengths are planning allowances; confirm the real runs on site.
Energy & savings
- Annual consumption
- Annual PV yield
- Consumption covered by solar
- Indicative annual saving
- Grid CO₂ avoided
Savings assume self-consumption at the tariff entered and no export credit. They are indicative only.
Engineering assumptions
These are set in the admin panel and applied to every calculation.
Save this sizing
Creates a reference you can share, print or hand to the sales team.
Saved as