Custom packs start with a target voltage and capacity—not a retail SKU. This guide walks through how to estimate custom battery pack pricing with amp-hours, nominal volts, and a realistic $/Wh for cells plus BMS before wires and labor.
Benefits
- Scales DIY cell $/Wh to your series/parallel Ah and V target.
- Same Ah × V × $/Wh math as turnkey packs—compare build vs. buy.
- Useful for quoting 12 V, 24 V, or 48 V banks from one unit-price assumption.
How it works
- Define pack Ah and voltage (e.g., 4S2P 280 Ah 12.8 V LiFePO4).
- Pick $/Wh from cell quotes—often lower than complete packs before BMS and case.
- Run the estimator for base cell cost; add BMS, busbars, and labor separately.
FAQ
How do I estimate custom battery pack pricing?
Cell cost ≈ Ah × V × $/Wh. Example: 280 Ah × 12.8 V = 3,584 Wh; cells at $0.12/Wh → ~$430 before BMS ($50–$150), enclosure, and labor. Compare that total to a retail 280 Ah pack sticker price to see if DIY wins.
What $/Wh should I use for DIY LiFePO4 cells?
Raw prismatic or cylindrical cells often quote $0.08–$0.15/Wh in bulk; add 10–30% for BMS, holders, and nickel strip. Complete DIY packs with quality BMS commonly land near $0.12–$0.20/Wh all-in—enter your blended $/Wh in the tool.
Does the calculator include BMS and assembly?
The tool models energy cost at $/Wh × rated Wh only. Add BMS, fuses, enclosure, and labor on top—or bump $/Wh to a blended rate that includes those line items. Compare that all-in $/Wh to retail packs for a fair build-vs-buy call.
Technical specifications
- Rated Wh = Ah × nominal_V.
- Cell stack cost ≈ Wh × cell_$/Wh.
- All-in DIY ≈ cell_cost + BMS + hardware + labor.
- Related: battery-pack-cost-calculator, solar-battery-bank, battery-bank-size.
Design voltage and Ah first
Custom builds follow your bus voltage—12 V RV, 48 V solar hybrid, 36 V e-bike—not whatever Amazon lists. Once series count sets nominal V and your runtime target sets Ah, Wh is fixed. Pricing starts there: multiply Wh by a cell $/Wh you can actually source, then layer BMS and hardware.
Blended $/Wh beats forgetting line items
Quoting cells at $0.09/Wh and stopping understates the pack. Either add BMS and case dollars explicitly or use a blended $/Wh that averaged your last three DIY builds. Enter that blended rate in the calculator so the total matches what you would wire—not an optimistic cell-only fantasy.
Build vs. buy on the same Wh
Run retail pack $/Wh against your DIY blended $/Wh on identical Ah × V. If DIY saves 15% but needs a weekend and warranty is on you, the sticker premium may be rational. The estimator gives the cell-energy baseline; your time and risk tolerance finish the decision.