Price-Per-Watt Calculator: Compare Portable Power Stations on the Go

Stop guessing — calculate value fast: a mobile price-per-watt-hour tool for power station deals

Hook: You’ve found a killer sale on a Jackery, EcoFlow or DELTA Pro — but is it really the best value? If you’re buying on a deal alert and need to decide on the go, one quick number cuts through the noise: price-per-watt-hour. Use this mobile-first calculator and explainer to compare portable power stations instantly and buy with confidence.

Why price-per-watt matters right now (2026 snapshot)

In late 2025 and early 2026 the portable power market moved fast: manufacturers leaned more on LFP battery chemistry, modular packs hit mainstream, and flash sales spiked during post-holiday inventory pushes. That means great one-day prices — but also confusing product families. Retailers pushed deal-heavy windows (example: Jackery HomePower 3600 Plus at $1,219 and an EcoFlow DELTA 3 Max flash price of $749 in mid-January 2026). Price alone lies. You need a normalized cost metric you can calculate on your phone: price-per-watt-hour (and its refined cousins: price-per-delivered-kWh and lifetime cost-per-kWh).

Quick overview: what this mobile calculator does

• Turns any advertised deal (price + listed watt-hours) into a single comparable metric: price per delivered kWh.
• Adjusts for real-world factors you’ll face: usable depth-of-discharge (DoD) and inverter efficiency.
• Shows how battery chemistry and cycle life change the cost per kWh over the product lifetime.
• Fits in your phone’s calculator or a three-cell mobile spreadsheet for instant comparisons.

The formulas — simple, copy-paste friendly

Use these on your phone calculator or paste into a cell in Google Sheets / Excel on mobile.

Core formulas (one-line)

1. Price per nominal Wh = Price ÷ ListedWh
2. Delivered Wh = ListedWh × DoD × InverterEfficiency
   • DoD (typical): 0.85 (LFP), 0.75 (good NMC), 0.60 (conservative)
   • Inverter Efficiency (typical): 0.90
3. Price per delivered kWh = Price ÷ (DeliveredWh ÷ 1000)
   • or equivalently: Price ÷ (ListedWh × DoD × InverterEfficiency ÷ 1000)
4. Lifetime cost per kWh = Price ÷ (DeliveredWh ÷ 1000 × CycleLife)
   • CycleLife: the cycles to a chosen end-of-life (commonly 70–80% capacity left)

Phone-ready one-line calculator (paste into a single calculator input)

Example formula to paste and evaluate with numbers:
(Price) ÷ ((Wh) × (DoD) × (InverterEff) ÷ 1000)

Replace values: e.g., Jackery example: 1219 ÷ ((3600 × 0.85 × 0.9) ÷ 1000)

Worked examples — use these as templates on the fly

We’ll use the Jan 2026 sale prices as sample inputs so you can see how to compare deals instantly.

Example A: Jackery HomePower 3600 Plus (sale price $1,219)

Assume: Listed capacity = 3600 Wh (3.6 kWh) — name implies this capacity. Use DoD=0.85 and inverter=0.90 for a reasonable delivered estimate.

• Delivered Wh = 3600 × 0.85 × 0.90 = 2,754 Wh (2.754 kWh)
• Price per delivered kWh = 1,219 ÷ 2.754 = $442.80 per kWh
• Price per nominal Wh = 1,219 ÷ 3600 = $0.339 / Wh (≈ $340 / kWh nominal)
• If cycle life is 1,000 cycles → lifetime cost per kWh = 1,219 ÷ (2.754 × 1,000) = $0.4428 / kWh
• If cycle life is 3,000 cycles (LFP scenario) → lifetime cost per kWh = 1,219 ÷ (2.754 × 3,000) = $0.1476 / kWh

Example B: EcoFlow DELTA 3 Max (sale price $749) — capacity unknown at glance

The key advantage of this method: you don’t need to memorize specs. Grab the listed Wh and plug in. Below we show three capacity scenarios to highlight sensitivity.

Scenario 1 — if listed = 1,024 Wh

• Delivered Wh = 1,024 × 0.85 × 0.90 = 783.8 Wh (0.784 kWh)
• Price per delivered kWh = 749 ÷ 0.7838 = $955 / kWh

Scenario 2 — if listed = 2,048 Wh

• Delivered Wh = 2,048 × 0.85 × 0.90 = 1,567.6 Wh (1.568 kWh)
• Price per delivered kWh = 749 ÷ 1.5676 = $478 / kWh

Scenario 3 — if listed = 3,072 Wh

• Delivered Wh = 3,072 × 0.85 × 0.90 = 2,351.4 Wh (2.351 kWh)
• Price per delivered kWh = 749 ÷ 2.3514 = $319 / kWh

Takeaway: the sale price alone ($749) can be an amazing value or mediocre depending on the model’s Wh. Always check the listed Wh on the product page and run this single calculation.

Advanced: include battery chemistry and cycle life for true long-term value

Short-term buyers and campers will weigh upfront price. If you want a long-lived backup or daily off-grid use, cycle life and chemistry matter much more than an extra $50 today.

How to compute lifetime cost per kWh (quick method)

1. Compute Delivered kWh per cycle = (ListedWh × DoD × InverterEff) ÷ 1000
2. Estimate CycleLife (manufacturer spec or conservative value): 800 (NMC), 2,000–3,000 (LFP)
3. Total lifetime kWh = Delivered kWh per cycle × CycleLife
4. Lifetime cost per kWh = Price ÷ Total lifetime kWh

Example: Jackery 3600 (Price $1,219) with LFP-like cycle life 3,000 → Lifetime cost ≈ $0.148 per kWh. With just 1,000 cycles it’s ≈ $0.443 per kWh. That swing is why LFP adoption in 2025–2026 changed buyer priorities.

Practical, mobile-first workflow — decide in under 90 seconds

1. Open the product page on your phone and copy the listed Wh and price.
2. Use the phone calculator: paste this one-line expression and replace values:
   Price ÷ ((Wh × 0.85 × 0.90) ÷ 1000)
3. Compare resulting $/kWh across candidate products — lower is better for long-term energy value.
4. Adjust DoD to 0.75 if the model uses NMC or if the manufacturer lists conservative usable Wh.
5. Estimate cycle life (manufacturer spec or typical chemistry): plug into lifetime formula if you plan daily use.

Mobile spreadsheet template (3 cells) — copy into Google Sheets on your phone

1. Cell A1: Price (e.g., 1219)
2. Cell A2: Wh (e.g., 3600)
3. Cell A3 formula: =A1/((A2*0.85*0.9)/1000) — returns $/delivered_kWh

Beyond price-per-watt: the deal checklist you must run through

Price-per-watt-hour solves the value math, but a smart purchase checks these extras. Mobile checklist before you tap “buy”:

• Warranty & Support: Longer warranties and clear service paths matter for batteries. 2–10 year variability exists; longer indicates better expected lifetime.
• Chemistry: LFP means more cycles and safer thermal behavior — often better lifetime cost even if up-front price is slightly higher.
• Expandability: If you can add extra battery modules later, compute price-per-Wh for the base unit and the modules combined.
• Solar compatibility / MPPT: Bundles with panels can drastically improve effective $/kWh when off-grid; see community solar and integration notes.
• Shipping & Hazmat fees: Batteries add extra shipping or address restrictions — factor those into final price.
• Refurb / open-box: Certified refurbished units often drop the price-per-Wh dramatically; verify warranty.
• Coupon validity & stacking: Confirm coupon expiration, allowed payment methods, and whether cashback portals stack.

2026 deal-tracking strategies that actually work

In 2026 retailers used more dynamic pricing and targeted flash windows. Don’t fight alone — automate your hunt.

• Set deal alerts for specific models and for a price-per-kWh threshold you’re willing to accept. Example: Alert me if Jackery 3600 drops below $350/kWh nominal or $0.22/kWh lifetime (based on assumed cycles).
• Use bundling windows: Often panels or accessories are bundled at deeper discounts — compute combined $/kWh for the bundle if you will use the panels.
• Track historical low prices: Create a simple sheet that records Price, Wh, and date. Over weeks this shows whether a “sale” beats previous lows.
• Watch refurb channels: Certified refurb often has short windows with warranty — a 20–30% discount can make a mid-range unit the best overall value.

How to use price-per-watt to decide between Jackery, EcoFlow and DELTA Pro variants

Start with the price-per-delivered-kWh number. Then map use-case:

• Occasional camping / short trips: Upfront price matters more; a cheaper small DELTA model at a low $/Wh nominal may win.
• Home backup / daily off-grid: Lifetime cost-per-kWh is king — prioritize LFP, higher cycle life and lower lifetime $/kWh even if sticker price is higher. If you’re vetting additional kit or want to vet gadgets for a long-term kit, use lifetime $/kWh as your filter.
• Expandable systems (DELTA Pro class): Consider the base plus extension packs. Compute combined $/Wh for the full intended system.

Real-world examples and decisions

Readers in Jan 2026 saw these two deals—both good—but the math tells different stories:

• Jackery HomePower 3600 Plus at $1,219 — great for those who want a large single unit with strong delivered kWh if the unit uses LFP chemistry. Best for long-term backup when cycle life is high.
• EcoFlow DELTA 3 Max at $749 — could be a steal if the listed Wh is high. If the model is small (1,024 Wh), it’s only a short-term value for portable trips; if it’s 3,000+ Wh it may beat the Jackery on upfront $/Wh.

Quick rule: never buy until you run Price ÷ ((ListedWh × DoD × InverterEff) ÷ 1000). If you’re under your target $/kWh, pull the trigger.

Actionable takeaways — use these when a flash sale hits

• Bring up the product page immediately, copy the listed Wh and price, and run the one-line calculator. Don’t rely on memory.
• Set a lifetime cost threshold for long-term backup buys (example: target under $0.20/kWh lifetime if you plan daily cycling).
• Factor in shipping/hazmat and warranty before clicking buy — a $50 hazmat fee changes the math on tight deals. See regional shipping costs and postcode surcharges when comparing final prices.
• If you’re mobile, use the 3-cell Google Sheets template so you can compare multiple models in parallel.
• For modular systems (DELTA Pro-style), compute the combined capacity and total price before judging value — expansion packs change the denominator dramatically.

Final checklist before you hit “Buy”

• Did you run price-per-delivered-kWh? (Yes / No)
• Did you check DoD assumptions and manufacturer’s usable Wh? (Yes / No)
• Did you factor in shipping, taxes, and coupon-stacking? (Yes / No)
• Does the lifetime cost-per-kWh match your use-case? (Yes / No)

Conclusion — the one-minute decision method

On the go, price-per-watt-hour turns an emotional flash-sale buy into a measured, profitable decision. In 2026 the market’s volatility makes this step essential: a $749 flash price can be a bargain or a trap depending on capacity and chemistry. Use the mobile calculator, add cycle life to price-per-kWh for long-term buys, and always check warranty and shipping on your phone before checkout.

Call to action — calculate now and never overpay

Got a link to a Jackery, EcoFlow, or DELTA Pro deal in your clips or messages? Run the one-line calculator on your phone or paste the three-cell spreadsheet template into Google Sheets and compare two or three products before buying. Sign up for mobile deal alerts to get notified when a model drops below your personal price-per-kWh threshold — and save more on every power-station purchase.

Quick copy for your phone calculator:
Replace values, then paste and evaluate:
PRICE ÷ ((WH × 0.85 × 0.90) ÷ 1000)

Example: Jackery example from Jan 2026: 1219 ÷ ((3600 × 0.85 × 0.90) ÷ 1000) = $442.80 / delivered kWh (use this to compare).

Related Reading

• Gear & Field Review 2026: Portable Power, Labeling and Live‑Sell Kits
• Field Kits & Edge Tools for Modern Newsrooms (2026)
• Field Rig Review 2026: Night‑Market Live Setup — Battery, Camera, Lighting
• Community Solar Finance & Edge Data in 2026
• Regional Shipping Costs Explained: Postcode Surcharges
• Patch Management for Legacy Quantum Lab PCs: Using 0patch to Extend Windows 10 Safety
• Sonic Racing: CrossWorlds vs Mario Kart — The Definitive PC Comparison for Competitive Groups
• On-Site De-Escalation: Safety Training for Plumbers After Real-World Assault Incidents
• Booster Boxes vs Singles: A Money-Saving Playbook for MTG Buyers on Amazon
• Animal Crossing 3.0: How to Unlock Every Amiibo-Exclusive Item (Splatoon, Zelda and More)