A PRACTICAL PLANNING TOOL
Start with the load.
Understand the battery.
Turn average power and operating time into an initial energy requirement. Keep the assumptions visible, then discuss the details with our team.
02 / PLANNING ESTIMATE
Estimated nameplate energy
The load needs 1,600 Wh. The battery estimate also accounts for your chosen conversion efficiency and usable-capacity window.
Discuss this requirementA planning estimate, not a guaranteed runtime or a model recommendation. Peak load, ageing, temperature and voltage changes are not modelled.
THE METHOD
Simple arithmetic.
Explicit assumptions.
- Load energy (Wh) = average watts × hours
- Nameplate energy = load energy ÷ efficiency ÷ usable fraction
- Capacity (Ah) = nameplate energy ÷ nominal voltage
For example, a 100 W load running for 8 hours needs 800 Wh at the load. At 90% conversion efficiency and 80% usable capacity, the planning estimate is about 1111 Wh, or 86.8 Ah at 12.8 V.
Final selection also needs continuous and peak current, BMS protection, charger profile, dimensions and operating conditions. Include these in your RFQ.
Prepare a complete battery RFQ