Free Engineering Calculators

The same calculators our engineering team uses.

15 tools we built for ourselves and opened up for anyone planning a battery project. They won't size your system for you — but they'll get you to a sensible first number in a couple of minutes, before you talk to a salesperson.

15
Free calculators
2
Live today
400+
Projects we've sized
~2 min
Per calculation

📐Size and pick the right product

Before you quote
The math you do before quoting a project — how much capacity you actually need, which product line fits, and how long it'll back up the load.
Live
For homeowners & installers

Home Power Consumption

Work out a household's daily kWh use without combing through utility bills, then see the storage size that actually covers it.

You enterRooms, appliances, hours of use
You getDaily kWh + suggested battery capacity
Coming soon
Soon
For commercial buyers & EPCs

C&I Storage Sizing

Enter a factory's peak kW and monthly kWh; the tool suggests which HC-series cabinet fits without over- or under-sizing.

You enterPeak kW, monthly kWh, target payback
You getHC64P / 241P / 723S / 1205S recommendation
Coming soon
Soon
For utility-scale developers

Container Storage Sizing

Match 1, 2 or 5 MWh containers to a utility project's energy and power needs, with the dispatch hours you actually plan to run.

You enterMWh needed, discharge hours, site footprint
You getContainer count + product fit
Coming soon
Soon
For technical buyers

C-rate Calculator

Tell the tool how much power you need for how long; it picks whether a 0.25C or 0.5C product fits your dispatch profile.

You enterkWh + required discharge duration
You get0.25C vs 0.5C product fit
Coming soon
Soon
For homeowners & installers

Battery Backup Duration

Settle the "how many hours will this last in an outage" question before you commit to a battery size.

You enterBattery kWh + load profile
You getHours of backup at full / partial load
Coming soon
Soon
For home installers

Residential Stackable Sizing

Work out whether a household wants our high- or low-voltage line, and how many stackable packs gets them there.

You enterDaily home usage + voltage preference
You getHCH vs HCL + pack count
Coming soon
Soon
For off-grid & remote sites

Microgrid Sizing

Size storage + generation for a site that can't (or doesn't want to) lean on the grid — mining, islands, remote camps.

You enterSite load, PV/diesel mix, autonomy target
You getBattery + generation configuration
Coming soon

💰Run the money math

Make the case
Payback, levelized cost, layered revenue and tax credits — the numbers that decide whether a project moves forward or sits in someone's drawer for another year.
Soon
For utility-scale buyers

LCOS Calculator

Levelized cost of storage — the only metric that lets you compare two systems with different cycle lives and CAPEX on the same line.

You enterCAPEX, cycle life, efficiency, energy price
You get$/kWh delivered over project life
Coming soon
Soon
For solar retrofit projects

Solar Retrofit ROI

Pencils out payback and IRR for adding storage to an existing PV system, across self-consumption, peak shaving and backup value.

You enterExisting PV size, tariff, outage cost
You getPayback years + IRR sensitivities
Coming soon
Soon
For European frequency projects

Frequency Revenue

Model mFRR, aFRR and Dynamic Containment revenue — and see what the stack looks like when you layer multiple products.

You enterBattery size, country, contracted products
You getAnnual revenue per product + stack
Coming soon
Soon
For US-market projects

IRA Tax-Credit Estimator

Estimate the Investment Tax Credit, domestic-content adder, energy-community bonus and prevailing-wage step-up for a US project.

You enterProject size, location, sourcing, labor terms
You getITC % + dollar credit estimate
Coming soon
Soon
For OEM & white-label brands

OEM ROI Calculator

Cost and ROI for a private-label or contract-manufacturing program — landed cost, margin, breakeven volume.

You enterAnnual volume, target margin, customization
You getPer-unit cost + breakeven point
Coming soon
Soon
For commercial operators

Demand-Charge Savings

Estimate the demand-charge reduction you can capture from peak shaving — usually the fastest payback layer for a C&I battery.

You enterPeak kW, tariff demand rate, battery size
You getMonthly $ saved + annual ROI
Coming soon

🔌Quick lookups

Daily reference
Unit conversion and compatibility checks — the small calculations that come up every day on a job site or in a spec review.
Live
For everyone

Ah ↔ kWh Converter

Convert between amp-hours and kilowatt-hours at any battery voltage — the conversion you'll do a hundred times this year.

You enterAh (or kWh) + battery voltage
You getkWh (or Ah) instantly
Open calculator
Soon
For installers & spec reviewers

Inverter Compatibility

Look up which hybrid inverters pair with our residential batteries — useful for retrofits and for vetting an existing site before you quote.

You enterInverter brand + model
You getCompatible Hua Power batteries + notes
Coming soon
When the calculator gets you close enough

Send us your numbers — we'll size the system properly

Run the calculator that fits your project, then send us the inputs. An engineer who has done this 400+ times will check the sizing, recommend the right product line and come back with pricing — usually within one business day.