Battery pack quotes mix Ah, voltage, and chemistry—fair comparison starts with watt-hours and $/Wh. This guide walks through the battery pack cost calculator: capacity in Ah, nominal voltage, price per Wh, and total estimated pack cost.
Benefits
- Total cost = Ah × V × $/Wh (energy × unit price).
- Normalizes different voltage packs to Wh for apples-to-apples deal checks.
- Typical LiFePO4 range $0.10–$0.25/Wh built into the workflow.
How it works
- Enter pack capacity in amp-hours (Ah) from the spec sheet or label.
- Add nominal voltage (12 V, 24 V, 48 V, etc.) and your $/Wh quote or market rate.
- Read estimated pack cost and implied Wh—compare against retail listings.
FAQ
How do I calculate battery pack cost?
Pack cost ≈ Ah × V × $/Wh. Example: 100 Ah × 12 V = 1,200 Wh; at $0.15/Wh → 1,200 × 0.15 = $180. Same energy at 24 V would be 50 Ah × 24 V = 1,200 Wh—same cost at the same $/Wh.
What is a good $/Wh for LiFePO4 packs?
Complete LiFePO4 packs with BMS often land around $0.10–$0.25/Wh depending on form factor, brand, and shipping. DIY cells can be lower; turnkey RV or solar racks may be higher. Enter the $/Wh you were quoted to sanity-check the total.
Why use Wh instead of Ah alone?
Amp-hours alone ignore voltage—a 100 Ah 12 V pack is 1,200 Wh; 100 Ah at 48 V is 4,800 Wh and costs far more energy. Multiplying Ah × V gives Wh so $/Wh comparisons work across system voltages.
Technical specifications
- Wh = Ah × V.
- Pack cost $ = Wh × price_per_Wh.
- Implied $/Wh from retail = list_price ÷ rated_Wh.
- Related: battery-cost, ah-to-wh, solar-battery-bank.
Ah and V tell the energy story
Vendors advertise amp-hours; your wallet pays for watt-hours. A 280 Ah 12 V bank and a 140 Ah 24 V bank both store 3,360 Wh—enter both in the calculator at the same $/Wh and the total matches. That is how you spot whether a higher-Ah 12 V quote is actually a better deal.
$/Wh is the unit price line
Divide any sticker price by rated Wh to get implied $/Wh, then compare quotes. A $899 pack at 5,120 Wh is about $0.18/Wh; a $650 pack at 2,400 Wh is $0.27/Wh—the cheaper sticker is not the cheaper energy. The calculator runs the forward direction when you already know your $/Wh target.
Upfront cost is not lifetime cost
Low $/Wh AGM may win day one; higher-cycle LiFePO4 wins over years. This tool estimates pack purchase price only—pair results with cycle life, warranty, and BMS quality before sizing solar or RV banks. Cost per usable Wh over warranted cycles is the next comparison step.