$1500 Solar System Runs RV AC Endlessly

Hey, it's Glen with Ultimate Freedom. On the hottest day of 2026 in South Carolina—hitting 97 to 100 degrees—I'm testing how long my 600 amp hour lithium battery, solar panels, and 3000 watt inverter can run a 12,000 BTU residential mini split AC full blast in my RV for real off-grid cooling. Starting with a full battery at 13.7 volts, I'm pulling around 400-500 watts while adding solar input, upgrading wires to 4 gauge, adding fuses per your great and helpful comments, and fixing that undersized inverter cable situation. You have made this channel the best comment section on YouTube. You taught me a ton—thanks for the tips on fuses, ROMEX upgrades to 10/2 or 10/3 for 30 amps. I am keeping systems simple and separate for reliability instead of paying for expensive integrated setups. This cheap 12-volt solar system keeps the rig cool without breaking the bank, plus I'm planning a second 24-volt mini split with more deployable panels for full-time boondocking power. If you're into RV solar, lithium batteries, off-grid air conditioning, or van life hacks that actually work, watch this and drop your setup tips below. Stay cool and free out there! Chapter Breaks: 0:00 - 2:34 Hottest Day RV Mini Split Test: 600Ah Battery & Solar Power 2:34 - 5:30 Full Blast 12k BTU Mini Split Power Draw & Battery Voltage Check 5:30 - 8:33 Separate RV Systems vs Integrated: Reliability & Voltage Drop Fix 8:33 - 10:59 3000W Inverter Cables Upgrade & Why Big 4 AWG Wires Matter 10:59 - 13:37 Solar Production, Battery Math & 600Ah Runtime for RV AC 13:37 - 16:39 All Day Off Grid Mini Split Running on Solar & Lithium Battery 16:39 - 19:55 Adding Fuses to Solar Panels, Charge Controller & Safety Upgrades 19:55 - 23:12 10/2 ROMEX 30 Amp Plug Install & Inverter Compartment Cooling 23:12 - 26:28 Power of Independent RV Electrical Systems & Future Plans 26:28 - 29:36 Second 24V Mini Split, 400Ah Battery Bank & RV Solar Upgrades Glen The Ultimate Freedom Level II RVTI / RVIA Certified Repair Tech Products, How to's, Travel, at the most affordable prices possible. "Do what they do, don't pay what they pay"