Engineering-Grade
Battery Sizing.
Accurate solar battery calculations without marketing bias. Determine precise kWh requirements, verify inverter compatibility, and match real hardware.
Enter daily kWh
Your home's energy use
Choose backup days
+ winter buffer option
Get battery size
+ recommendations
Updated just now
Load Target
Battery Usable
Nameplate Needed
Powerwall 3
Tesla • 13.5 kWh capacity
Why BatteryBlueprint?
Calculations based on physics and engineering principles, not salesperson estimates.
Physics-Based Logic
We separate Power (kW) from Energy (kWh) to prevent under-sizing. Ensure capacity meets actual load duration requirements.
Resilience Buffers
Winter and reserve buffers, plus Depth-of-Discharge limits, are built into the calculation.
Hardware Matching
Match calculated loads against manufacturer-published specifications for component systems (e.g., Powerwall 3, Enphase 5P, SLIC).
From the Knowledge Hub
In-depth technical guides written for homeowners who want to understand their system — not just buy one.
How to Size a Solar Battery Correctly
The engineering step-by-step method for calculating your actual battery requirement — nightly consumption, winter surplus, and backup reserve.
Read guideResidential Battery Technical Specification Comparison
Side-by-side specifications for Powerwall 3, Enphase IQ 5P, FranklinWH, GivEnergy, and other principal systems — with honest performance analysis.
Read guideLithium vs Lead-Acid: Total Cost Analysis
Why LFP batteries are 54% cheaper than lead-acid over 10 years, with cycle life math, safety analysis, and real-world installation constraints.
Read guideUK Solar Battery Incentives 2026: Complete Guide
0% VAT, Smart Export Guarantee, ECO4, and Home Energy Scotland — which schemes apply to you and how to claim without common errors.
Read guide