Solar Arbitrage Calculator

① Bill OCR Import Module 1

Drop a ConEd (or any utility) bill image/PDF. Auto-extract kWh, tiers and rates into every calculator below.

What this does · steps · status

What: Reads your bill with vision OCR and fills the whole app so you never type numbers twice.
Steps:

Drag a bill image/PDF onto the box (or tap to browse).
Wait for extraction — fields highlight in teal.
Correct any wrong value; edits flow everywhere.

Status: Waiting for a bill. Using default presets (549 kWh/mo) until then.

Upload

📄

Drag & drop your bill here, or tap to browse

PNG · JPG · PDF · HEIC — processed via Cloudflare Workers AI, with offline manual fallback

Extracted bill data — editable

Account holder

Service address

Billing period

Utility / rate

Total kWh / month

Super-peak kWh

On-peak kWh

Off-peak kWh

Rates ($/kWh) — supply + delivery per tier. ConEd EL7 defaults; override from your bill.

Tier	Supply $/kWh	Delivery $/kWh	All-in $/kWh
Super-peak			0.415
On-peak			0.290
Off-peak			0.130

② Roof Space Module 2

Usable roof area and how many panels physically fit — portrait vs landscape.

What this does · steps · status

What: Turns roof dimensions into a real panel count after setbacks.
Steps:

Enter roof length × width.
Set usable % (setbacks/vents).
Read max-fit grid below.

Status: Ready.

Roof inputs

Roof length (ft)

40 ft

Roof width (ft)

25 ft

Usable %

70 %

Roof pitch (°)

25 °

Azimuth

Result

Usable area

—

Max panels (portrait)

—

Max panels (landscape)

—

Azimuth derate

—

Layout preview

Portrait fit Landscape fit

③ Consumption Analyzer Module 3

Daily / monthly / annual kWh by TOU tier, with NYC seasonal projection.

What this does · steps · status

What: Projects a year of usage from one bill using NYC climate factors (1.3× summer, 0.8× winter).
Steps:

Values come from Module 1.
Read the KPIs and monthly chart.

Status: Ready.

Avg daily use

—

Annual (seasonal)

—

Est. peak demand

—

Peak-tier share

—

Monthly usage by tier (seasonally adjusted)

Super-peak On-peak Off-peak

④ Panel Selector Module 4

Commercial-grade panel database, ranked warranty → efficiency → temp-coeff → price.

What this does · steps · status

What: Picks a panel and sizes the array to your consumption target and roof.
Steps:

Pick a model — specs auto-fill.
Set your offset target %.
Read panels-needed vs roof-fit check.

Status: Ready.

Select panel

Model (ranked best → worst)

Target offset of annual use (%)

100 %

Or set panel count directly (0 = auto)

auto

Array result

Panels needed

—

System DC

—

Est. annual yield

—

Roof fit

—

Panel database

#	Model	W	Eff %	Voc	Vmp	Imp	Isc	Temp co.	Cell	Warranty	Price

⑤ String Sizing & Inverter Module 5

Temperature-corrected Voc, MPPT window check, and inverter match.

What this does · steps · status

What: Keeps cold-morning string voltage under 600 V and warm-day voltage inside the MPPT window.
Steps:

Set design min/max temps.
Read panels-per-string & string count.
Confirm the recommended inverter.

Status: Ready.

Design temps

Min design temp (°C)

-15 °C

Max design temp (°C)

40 °C

Max system voltage (V)

600 V

String result

Voc @ min temp

—

Max panels / string

—

Config

—

String Vmp @ max temp

—

Recommended inverter

	Inverter	AC kW	PV kW	MPPTs	Grid charge	Price

⑥ Battery & Arbitrage Module 6

The money engine — shift peak load to off-peak charging and count the savings.

What this does · steps · status

What: Charges from solar + cheap off-peak grid, discharges super-peak first. Computes daily savings, bill before/after, and payback.
Steps:

Pick a battery module and count.
Set DoD & round-trip efficiency.
Read savings, payback, and the 24 h flow.

Status: Ready.

Battery bank

Module

Module count

4

Depth of discharge (%)

90 %

Round-trip efficiency (%)

90 %

Install cost estimate ($)

$3,500

Bank capacity

Total capacity

—

Usable / day

—

Daily peak load

—

Sizing

—

Arbitrage savings

Monthly savings

—

Annual savings

—

Payback period

—

Nightly grid charge

—

Bill: before → after

24-hour energy flow

Solar Battery discharge Grid charge Grid draw

⑦ Wire & Component Sizing Module 7

NEC 690 conductor, conduit, voltage-drop, disconnect, EGC and rapid-shutdown sizing.

What this does · steps · status

What: Sizes DC wiring to code so the BOM buys the right copper.
Steps:

Set the one-way run length.
Read gauge, conduit, Vdrop, disconnect.

Status: Ready.

Run

One-way DC run length (ft)

45 ft

Target voltage drop (%)

3 %

Rapid-shutdown device

NEC 690 result

⑧ Material Sourcing & BOM Module 8

Complete bill of materials with vendor, SKU, and grand total. Export CSV.

What this does · steps · status

What: Rolls every module into a priced shopping list from real solar vendors.
Steps:

Everything above feeds this automatically.
Export CSV to price-shop.

Status: Ready.

Component	Qty	Unit $	Line $	Vendor	SKU / part	Availability

Solar Arbitrage Calculator

① Bill OCR Import Module 1

Upload

Extracted bill data — editable

② Roof Space Module 2

Roof inputs

Result

Layout preview

③ Consumption Analyzer Module 3

Monthly usage by tier (seasonally adjusted)

④ Panel Selector Module 4

Select panel

Array result

Panel database

⑤ String Sizing & Inverter Module 5

Design temps

String result

Recommended inverter

⑥ Battery & Arbitrage Module 6

Battery bank

Bank capacity

Arbitrage savings

Bill: before → after

24-hour energy flow

⑦ Wire & Component Sizing Module 7

Run

NEC 690 result

⑧ Material Sourcing & BOM Module 8

⑨ Visualization Dashboard Module 9

Monthly production vs consumption

25-year cumulative savings

Cost breakdown

⑩ Report & Export Module 10

Project summary

Installation checklist

NEC compliance verification