How to size commercial battery energy storage system
How to Size a Commercial Battery Energy Storage System (kW vs kWh Explained)
When planning a C&I energy storage project, one of the most important decisions is sizing. Many clients ask:
- “How many kWh do I need?”
- “How many kW should the inverter/PCS be?”
kW vs kWh (Simple Explanation)
- kW (Power) = how much energy you can supply at one time
- kWh (Energy) = how long you can supply that power
Example:
A 100kW load running for 2 hours needs 200kWh of energy.
What Determines Battery Size?
Sizing depends on:
- Critical loads (what must stay on)
- Backup time required
- Peak shaving targets
- Solar PV availability
- Future expansion plans
Common C&I Sizing Mistakes
Avoid:
- Oversizing batteries without clear ROI
- Undersizing PCS/inverter power
- Ignoring starting currents (motors & pumps)
- No proper load profiling
A professional assessment ensures your ESS delivers performance and savings.
Contact Us
Reliable Solar & Energy Storage Solutions for East Africa
Northern Bypass, Nairobi – Marurui
Behind Galana Energies, Village Inn Road
Tel: +254 712 172 222 | +254 784 323 222
Email: info@solarman.co.ke
Website: www.solarman.co.ke
