Inverter loss: AC output loses 10–15% vs stored Wh. Real AC runtime = Wh × efficiency / load.
DC outputs (USB, 12V): Add devices drawing from DC at ~95% efficiency vs battery.
Cold temperature: Below 0°C LFP may deliver only 70–80% capacity. Factor in extreme conditions.
About This Calculator
What this tool does: Estimates how long a portable power station can run selected devices under realistic efficiency assumptions.
Core idea: Runtime equals usable battery energy divided by effective load power.
Mini Example
A 1024 Wh station with losses and reserve may deliver far less than 1024 Wh to AC appliances.
Quick Literacy Notes
- AC runtime is shorter than DC ideal estimates due to inverter losses.
- Mixed intermittent loads require duty-cycle modeling for realistic results.
- Reserve SOC helps protect battery life and avoids abrupt shutdown near empty.
Common Mistakes
- Dividing nameplate Wh by load watts without efficiency correction.
- Ignoring duty-cycle behavior for intermittent devices.
Key Takeaways
- Runtime equals usable battery energy divided by effective load power.
- AC runtime is shorter than DC ideal estimates due to inverter losses.
- Avoid this mistake: Dividing nameplate Wh by load watts without efficiency correction.
Practical Checklist
- Use usable Wh after reserve SOC and conversion losses.
- Apply duty-cycle modeling for intermittent and mixed device usage.
- Run best-case and conservative-case runtime scenarios before field deployment.
FAQ
Q1: Which runtime input should be validated first for realistic estimates?
Quick Answer: Validate this first: AC runtime is shorter than DC ideal estimates due to inverter losses.
Engineer Note: If this assumption drifts from real conditions, downstream outputs can remain numerically neat but operationally wrong. Confirm with measured or site-specific inputs before locking decisions.
Q2: What shortcut most often overstates portable power runtime?
Quick Answer: Avoid this first: Dividing nameplate Wh by load watts without efficiency correction.
Engineer Note: In practice, the next failure mode usually follows: Ignoring duty-cycle behavior for intermittent devices. Address both together; correcting one while keeping the other often leaves the design bias unchanged.
Q3: When should I run scenario-based runtime planning instead of one-point estimates?
Quick Answer: Use this calculator for fast screening and scenario comparison.
Engineer Note: For procurement, warranty, compliance, or commissioning decisions, move to detailed verification with datasheets, measured conditions, and project constraints. Core rule: Runtime equals usable battery energy divided by effective load power.
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