DC Wire Sizer vs Epoch Li
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DC Wire Sizer
Calculate appropriate DC wire sizes for electrical projects, preventing equipment damage and fires. Save, edit, and export wire run details for electrical plans and material purchases. Features a wizard for easy sizing for all users.
- Calculates wire size, voltage drop, and ampacity
- Supports custom DC voltages up to 500 amps
- Save, edit, and export wire run details
- Sizer Wizard for easy calculations
- Select marine standards (ABYC or ISO)
- Choose from various wire types and insulation ratings
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Adding accessories (bilge pumps, electronics, solar, etc.) or upgrading batteries (AGM, Li, etc.) this year? The #1 Cause of Boat and RV fires is DC wiring! Undersized wires can damage equipment or cause fires. The top-rated DC Wire Sizer calculates wire size for any DC voltage (ideal for solar in series). Plus lets you SAVE, EDIT, SUM, EMAIL and EXPORT the wire runs and material for your electrical plan, wire purchases, work orders, and records. And the Sizer Wizard option makes wire sizing easy for EVERYONE! Fast and safe wire sizing calculator for your next DC wiring project (battery, charger, inverter, trolling motor, stereo, and more). Designed with and for Marine Electronics Installers, Repair Services, Boat Builders, Surveyors, Do-It-Yourselfers, and Boat Owners. ONLY DC WIRE SIZER OFFERS these FEATURES: - Select any DC voltage and up to 500 amps - Results display wire size, VOLTAGE DROP (VD), and AMPACITY! - More granular “What if” analysis of ampacity & VD based on wire sizes & length - Choose from three methods of entering wire lengths for fast entry including separate positive/negative wire lengths (when different or negative is contact grounded, like a starter) - SAVE Wire Runs with the option to select or enter Wire Run & Project Name, wire type, wire color, status, and material source (Inventory or Buy) - EDIT Wire Runs including wire length, amps/watts, max voltage drop, insulations, inside/outside engine room, bundle, and the fields above. - SUMs active wire run lengths by size, type, and color to make purchasing easier and less expensive when by the reel (25’, 50’, 100’, etc.) - Select from a wire type list (e.g., primary, battery, safety, flat, duplex, triplex, mast, twisted, bilge, trailer, and solar cable) - Select marine standards (ABYC or ISO) - Change Unit of Measurement (Feet or Meters) in existing Wire Runs - Easy to use Sizer Wizard - Email and Export of Wire Runs and Raw Material MORE FEATURES: - Set default Wire Gauge (AWG, SAE, or MM2) - Set default Unit of Measure (feet or meters) - Select or enter Maximum Voltage Drop % - Select Bundle Size (1, 2-3, 4-6, 7-24, and 25+) - Select Insulation rating (60°, 75°, 80°, 90°, 105°, 125°, and 200°C) - Tap Inside/Outside Engine Room - Spin Amp/Watts and Wire Length for fast entry - Built-in Help and Technical Reference includes installation tips, connector types, color codes, tables (Voltage Drop, Ampacity, & Bundle), formulas (Power Triangle, Ohm's Law, etc.), recommended tools/books, and more. HERE’S WHAT REVIEWERS ARE SAYING: "The DC Wire Sizer is the most complete and comprehensive marine DC wire-sizing tool available. Developed for both marine professionals (the Wire Sizer Pro) and the occasional tinkerer (the Wire Sizer Wizard), the app determines the proper wire size, along with the voltage drop and ampacity by using the ABYC E-11 or ISO 10133 formulas and tables.” - OnboardOnline (2013) "Stay organized by adding a wire description to the wire run and assign it to a project name (ie boat name, owner or work order). Mark the wire run as "Complete" or “Cancelled”, re-order wire runs within a project or move them between projects. Tired of adding wire runs in order to figure out what to purchase and how much? DC Wire Sizer sums the active wire runs for you by wire size (e.g. 8 AWG) and type (e.g. Safety Duplex, Battery Cable, and Primary Wire).” - marinabusiness (AU 2013) "If you're doing a lot of wiring on your boat, the app allows you to save the calculations with project names and wire type. The app then can sum the length of the wire runs by wire type and size which can be used as a shopping list for your projects. No other app offers these unique features and that's what makes it a winner.” - i-marineapps (2013) "This is the best wire sizer program I have seen to date. I can size and make a list at the same time also there is a better selection of amps and volts.” - Keith Herridge, Special Projects, Lyman-Morse Boatbuilding
Epoch Li
Monitor your lithium-ion battery system in real-time via Bluetooth. View voltage, current, power, and internal resistance. Receive alerts for temperature, short circuits, and voltage deviations to extend battery life and enhance stability.
- Real-time voltage, current, power, and internal resistance display
- Individual battery voltage and alarm status monitoring
- Cell comparison and balancing display
- Temperature and critical parameter warnings
- Record of all warnings and protection events
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Make sure you have the latest app version. Turn on your Bluetooth. Tap the icon to open the App. It will search for all Epoch batteries within the range of your Bluetooth device and provide a list. If all the batteries are not listed, move closer to the battery location and refresh the screen. Choose the battery you want to look at. The Epoch intelligent battery management system and the active equalizer are connected via Bluetooth to monitor the battery status, collect, store and process information during battery operation in real time, exchange information with external devices, and solve the safety, usability and usage of the lithium battery system The key issue of life is to extend the service life of the battery to a certain extent, and to enhance the stability of the battery pack to a certain extent. 1. Display real-time voltage, current, power, internal resistance and other parameter values, and display them in the form of instrument panels and numbers; 2. Display the real-time voltage and alarm status of all single batteries. If the reported parameters trigger the alarm value or protection value, an alarm will be prompted; 3. Each data comparison of the battery cell, the voltage difference. Maximum voltage cell Minimum voltage cell. And the display of cell balance 4. Cell temperature warning. Real-time alarm for over temperature, short circuit, over voltage, under voltage 5. Record the warnings that occur at each moment. 6. Record all battery protection times. Best Regards !
Screenshots
Verdict
The clearest difference is review sentiment: DC Wire Sizer at 100% against Epoch Li's 29%. DC Wire Sizer also leads on rating (5.0 vs 2.6) and chart position (#169 vs unranked). Epoch Li's advantage is price (Free vs $2.99) and update cadence (every 3 weeks vs every 20 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Epoch Li is free to download; DC Wire Sizer costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.
DC Wire Sizer holds the better App Store score, 5.0 against 2.6. Both are backed by a comparable volume of ratings — 24 and 70 respectively. Written reviews point the same way: 100% of DC Wire Sizer's written reviews are positive against 29% of Epoch Li's.
DC Wire Sizer ships an update every 20 months, Epoch Li every 3 weeks. The most recent releases landed on October 3, 2026 and October 16, 2026 respectively.
| Parameter | DC Wire Sizer | Epoch Li |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 5.0 (24 ratings) — better | 2.6 (70 ratings) |
| Positive reviews | 100.0% of reviews — better | 29.2% of reviews |
| Number of ratings | 24 | 70 — better |
| Update frequency | Every 20 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #169 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 21 MB | 35 MB |
| Age rating | 4+ | 17+ |
| Developer | Dirty Dog Software, LLC | EDG Sales International LLC |
Customer experience
DC Wire Sizer
Epoch Li
Bugs and requests
DC Wire Sizer
Not enough reviews yet to summarise bugs or requests.
Epoch Li
Reported bugs
14 issues- Bluetooth does not auto-connect
- Bluetooth signal frequently drops
- App crashes frequently
- App disconnects when minimized or switching apps
- App does not remember previously connected devices
Show 9 moreShow fewer
- App shows incorrect battery charge levels
- App history tab is useless
- App is not documented, data is unclear
- App shows 0% or no data after recent updates
- App does not always reflect true battery charge
- App cannot see information from multiple batteries in series
- App has backward animations and sloppy UI
- App requires password for advanced settings without providing it
- App disconnects and will not re-connect until app is killed and reopened
Requested features
10 requests- Filter Bluetooth devices by MAC address prefix
- Implement BLE non-exclusive connection
- Bring back old app features (time to charge/discharge)
- Document app data and features
- Provide password for advanced settings
Show 5 moreShow fewer
- Allow saving of battery connections/names
- Release old app as a separate option
- Improve Bluetooth connection stability and range
- Fix incorrect battery charge readings
- Display data for multiple batteries in series correctly
In-app purchases
DC Wire Sizer
No in-app purchases
Epoch Li
No in-app purchases









