GOfermentor Jr.
Micro-Fermentation — Automated Cap Management, Built-in Press, App Control
GOfermentor Jr Bundle
Compact automated wine fermentation system for micro-fermentation trials and home winemaking. 50-110 lb grape capacity, producing 5-8 gallons of wine per batch. Add grapes and yeast for superb wine in 8-10 days.
Bundle Includes:
- GOfermentor Jr (fermenter unit with drum, bladder, controller) — $660
- Jr Liner (Pack of 3) — $82.50
- Sampler — $80
Save $50 in shipping vs. buying components individually.
GOfermentor Jr Plus Bundle
Everything in the Jr Bundle plus automatic temperature control.
Plus Bundle Includes:
- GOfermentor Jr+ (fermenter with temperature control) — $1,200
- Jr Liner (Pack of 3) — $82.50
- Sampler — $80
Automatic temperature control at desired setpoint by opening and closing control valve. Requires recirculating chilled water/glycol supply and return. 1/4 OD hose connections.
Why Winemakers Choose GOfermentor Jr.
Automated Cap Management
Internal bladder inflation performs automatic punch operations on your schedule via the app. No manual punching required — set it and let the Jr. do the work.
Built-in Press
Activate PRESS mode and the bladder inflates to squeeze pomace — approximately 15 minutes to press 6 gallons. No separate press needed but use of wine pump during pressing is recommended for full extraction
No Cleaning
Single-use pharmaceutical-grade fermentation bags eliminate all cleaning. Zero cross-contamination between batches. Reusable drum and bladders never contact wine.
Compact & Self-Contained
Bar-stool sized (30" × 20"). Completely self-contained — no destemmer, no separate press, no special installation. Just plug in and start making wine.
App Control
Control and monitor fermentation from your smartphone. Set punch schedules, activate pressing, and track progress — all from the palm of your hand.
Research & Education
Adopted by Penn State, University of New Mexico, and other institutions for experimental fermentation trials, smoke taint testing, and reproducible micro-fermentation research.
Complete System — Everything You Need
The $825 GOfermentor Jr. comes complete with sampler and 3 fermentation bags. Nothing else to buy to get started.
Reusable Drum
Rigid plastic drum with rubber bladder system. 20-inch fill opening for easy hand-filling of grapes. Drum and bladders never contact wine — reuse indefinitely.
Electronic Controller
Smartphone app for scheduling automated punch operations and activating the press. Controls bladder inflation for both cap management and pressing.
Fermentation Bags & Sampler
3 single-use pharmaceutical-grade bags included. Vacuum sampler for monitoring fermentation without opening the system. CO2 vented through supplied vent cap.
Jr. Accessories & Replacement Parts
JR Alcohol Estimator
$125
Integrated gas flow sensor measures CO2 to estimate alcohol production. Free app monitoring.
Jr Liner (Pack of 3)
$82.50
Single-use food-grade BPA-free fermentation bags for the GOfermentor Jr. Each bag holds 100lbs of grapes max (5 to 6 gallons of wine).
Jr Racking Liner (Pack of 10)
$82.50
18L (4.8 gal) bags for racking, malolactic fermentation, oaking, and storage.
Sampler
$80
Hand-operated vacuum sampler for contamination-free in-process wine testing.
Jr Container Only
$99
Extra container for the GOfermentor Jr. Only container. No bladder or other components
Making Red Wine in the Jr.
50-110 lbs of grapes. Automated cap management. Built-in press. 5-8 gallons per batch.
Fill
Fill the fermentation bag through the 20-inch opening with whole, crushed, or whole-cluster grapes. Add yeast and any additives. Close with the supplied vent cap.
Ferment
The controller automatically inflates the internal bladders on your set schedule — forcing wine through the cap for extraction of color and flavor. No manual punching needed.
Press
Connect the harvest tube to a collection vessel. Activate PRESS mode — the bladder inflates to squeeze the pomace. Approximately 15 minutes to press 6 gallons.
Discard & Reuse
Discard the spent grape bag. The reusable drum and bladders require no wine-contact cleaning — simply insert a new bag for the next batch.
Making White Wine in the Jr.
Press immediately or after cold-soak. Multiple press cycles maximize juice extraction. 5+ gallons from 100 lbs of grapes.
Fill & Cold Soak
Fill the bag with whole or crushed grapes. Optionally cold-soak before pressing for enhanced flavor development.
Press
Press juice through the 2" triclamp port directly into a collection vessel. Multiple press cycles at 30-minute intervals maximize juice extraction. Skins and seeds remain in the bag.
Collect & Ferment
Juice is collected separately for fermentation in your vessel of choice. The sealed pressing environment preserves delicate aromatics with minimal oxidation.
Technical Details
| Grape Capacity | 50–110 lbs (produces 5–8 gallons per batch) |
| Dimensions | 30" high × 20" wide (bar-stool size) |
| Fill Opening | 20" diameter for hand-filling |
| Cap Management | Automated via app-controlled bladder inflation |
| Pressing | Built-in integral press (~15 min for 6 gal) |
| Triclamp Port | 2" (for white wine pressing & clear lid) |
| Fermentation Bags | Pharmaceutical-grade, single-use (3 included) |
| Sampler | Vacuum sampler included |
| Control | Smartphone app (Android/iOS) |
| Gas Venting | CO2 automatically vented through supplied vent cap |
| Cleaning | None — discard bag, wipe drum |
| Price | $825 complete (includes sampler + 3 bags) |
GOfermentor Jr. Videos
Wine from Real Grapes Made at Home
GOfermentor Jr. Setup
Cap Management in Jr.
Automated Press in Jr.
Pressing White Wine in Jr.
Manuals & Downloads
View all manuals and resources on our Support page.