--- product_id: 445047221 title: "RFC30F 30 Farad Capacitor Blue Voltage Display" brand: "rockville" price: "$367.78" currency: USD in_stock: true category: "Rockville" url: https://www.desertcart.us/products/445047221-rfc30f-30-farad-capacitor-blue-voltage-display store_origin: US region: United States of America --- # 30 Farad ultra-high capacitance Platinum plated heavy-duty terminals Blue illuminated digital voltage display RFC30F 30 Farad Capacitor Blue Voltage Display **Brand:** rockville **Price:** $367.78 **Availability:** ✅ In Stock ## Summary > 🔊 Rock the Voltage, Own the Night! ## Quick Answers - **What is this?** RFC30F 30 Farad Capacitor Blue Voltage Display by rockville - **How much does it cost?** $367.78 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/445047221-rfc30f-30-farad-capacitor-blue-voltage-display) ## Best For - rockville enthusiasts ## Why This Product - Trusted rockville brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Style Meets Substance:** Sleek black wire mesh cover with blue illumination adds a modern, high-tech aesthetic that makes your sound system stand out. - • **Smart Energy Management:** IC controlled circuitry alerts you to voltage extremes and features an automatic sleep mode to conserve power when your system is idle. - • **Power Your Bass Like a Pro:** 30 Farad capacity delivers instant power surges up to 20V, eliminating dimming lights and voltage drops during heavy bass hits. - • **Stay Informed with Precision:** Super bright 3-digit blue LED display shows exact voltage to the decimal, so you always know your system’s health in real-time. - • **Built to Last, Built to Connect:** Heavy-duty bolt-down platinum plated terminals ensure rock-solid, corrosion-resistant connections for long-term reliability. ## Overview The Rockville RFC30F is a professional-grade 30 Farad digital hybrid capacitor designed to stabilize and boost your car audio system’s voltage. Featuring a bright blue LED voltage display, platinum plated terminals, and smart IC-controlled circuitry, it delivers up to 20 volts of power surge while protecting your electrical system from voltage extremes. Its sleek design and energy-saving sleep mode make it a must-have upgrade for serious audiophiles seeking flawless bass performance and system reliability. ## Description Have you noticed your headlights dimming to the beat when you hit those heavy bass notes on your car’s custom sound system? Cranking up the volume on your system can put inordinate amounts of stress on your vehicle’s electrical system. Most cars today cannot handle the high power demands of custom sound system components hence the need for a dependable and powerful capacitor. Enter the Rockville RFC30F Digital Hybrid Capacitor. This professional grade capacitor is built to handle even the most power hungry amplifiers delivering a surge of up to 20 volts of power when needed. Rockville engineers have gone out of their way to design and put in your hands a high end capacitor at half the cost of our competitors similarly spec’d models. The RFC30F features a 3-digit super bright digital LED read out which displays the unit’s exact operating voltage to the decimal point. It comes equipped with heavy duty bolt down style platinum plated terminals which ensure a safe and solid connection. The built in IC Controlled circuitry alerts you if your voltage is too high (+17.5v) or too low (-10v). An automatic sleep feature helps the capacitor reserve power during lulls in volume levels, delivering it only as needed. With its sleek lines, modern styling and cool blue LED accents, the RFC30F will enhance the look of any sound system. The reasonably priced RFC30F comes with a 90-day money back guarantee. With its high quality build and superb performance, its a definite step up and a must have for your car’s sound system. ## Features - Rockville RFC30F 30 farad capacitor Blue voltage display + built in distribution block - SR (equivalent Series resistance): 0.015 ohm @ 120Hz, 25°c - 30 farad digital Hybrid capacitor with Blue illumination - Blue illuminated window with light following played music - Black wire mesh cover ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01769I7W0 | | Best Sellers Rank | #29,670 in Electronics ( See Top 100 in Electronics ) #5 in Car Amplifier Capacitors | | Brand Name | Rockville | | Capacitance | 30 Farad | | Customer Reviews | 4.3 4.3 out of 5 stars (242) | | Equivalent Series Resistance | 0.02 Ohms | | Global Trade Identification Number | 00811080025179 | | Included Components | farad capacitor, metal mount tubes (2) | | Item Dimensions W x H | 27.7W x 6.5H centimeters | | Item Highlight | Digital Hybrid, 20V Surge, 3-Digit LED Meter, Over-Voltage Protection, Platinum Bolt-Down Terminals, Low ESR | | Item Shape | Block | | Item Type Name | Rockville RFC30F 30 Farad Capacitor Blue Voltage Display | | Manufacturer | Audiosavings | | Material Type | Metal | | Maximum Voltage | 20 Volts | | Model | RFC30F | | Mounting Type | Through-Hole Mount | | Number of Items | 1 | | Number of Packs | 1 | | Operating Voltage | 20 Volts | | Part Number | RFC30F | | UPC | 811080025179 | | Unit Count | 1 Count | | Upper Temperature Rating | 25 Degrees Celsius | ## Product Details - **Brand:** Rockville - **Capacitance:** 30 Farad - **Equivalent series resistance:** 0.02 Ohms - **Material:** Metal - **Shape:** Block ## Images ![RFC30F 30 Farad Capacitor Blue Voltage Display - Image 1](https://m.media-amazon.com/images/I/811-UeU-1ML.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Why was this one returned? i have a 4000w rockville amp and 2 rockville 15s. will this cap hold up. i have a bigger alternator and optima batteries.** A: Yes **Q: Can i connect 2 capacitors in 1 amp?** A: Yes but one capacitor should be enough **Q: I used 1 of these with 1 amp 8000w and 2 subs of 6000w each and i have dimming problems, the capacitor may be maulfunction?** A: Not If the volt meter on the cap isn't dipping below 13-12.6 volts , you might need a better battery . Sometimes if your battery is a little inadequate or alternator is lacking the cap will dip under it's stored power . **Q: This capacitor will only works fine with small amps.** A: I got a 10k watts amp and it doing good ## Frequently Bought Together - Rockville RFC30F 30 Farad Capacitor Blue Voltage Display - TKDMR 10pcs 1/0 AWG-3/8 Battery Lugs,Heavy Duty Wire Lugs,Ring Terminals,Battery Cable Ends,0 Guage terminals,Battery Terminal Connectors with 10pcs 3:1 Heat Shrink Tubing - SoundBox PK0-17, 0 Gauge Amp Kit Power Amplifier Install Wiring Cables - 7500W --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/445047221-rfc30f-30-farad-capacitor-blue-voltage-display](https://www.desertcart.us/products/445047221-rfc30f-30-farad-capacitor-blue-voltage-display) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-10-04*