Are you gonna be moving a lot or staying put? If youre stationary, try the Indipro Tools D-Tap to NP-W235 Dummy Battery for infinite power. TL;DR: Dummy batteries beat grips for ceremonies.

Honestly, skip the file transmitter grip. The Fujifilm FT-XH File Transmitter Grip is meant for studio tethering and high-speed data transfer, not really for weddings. Youre basically paying a massive premium for an ethernet port you wont use. The Fujifilm VG-XH Vertical Battery Grip is the standard choice and fits your budget perfectly.

• Power: It lets you run three Fujifilm NP-W235 Li-Ion Battery packs simultaneously. That should easily get you through a long ceremony.
• Heat: If youre worried about thermal throttling during 4K 120p, look at the Fujifilm FAN-001 Cooling Fan instead. It actually pulls heat off the sensor better than any grip will.
• Stability: Dont risk third-party grips on the X-H2S. Most of them cant handle the high power draw required for the fastest burst rates and will cause the camera to lag. Just get the VG-XH and maybe the fan if Tahoe is gonna be hot next weekend. Its the most reliable setup for the money.

@Reply #1 - good point! If you really want to be 100% safe, I totally recommend skipping those sketchy third-party grips and just grabbing a high-end PD power bank. I use the Anker 737 Power Bank 24000mAh 140W and it is amazing for long wedding shoots! It keeps my X-H2S topped off through USB-C all day without any hiccups. Its such a fantastic, reliable setup so you dont miss the vows!

TL;DR: Buy the Fujifilm VG-XH Vertical Battery Grip and the Fujifilm FAN-001 Cooling Fan together. It stays under your 400 dollar budget and kills the overheating issue for good! I totally get the stress of wedding shoots! Honestly, the FT-XH is overkill for weddings unless you are literally beaming files to a server live. For the heat issue you mentioned, that dedicated fan is a total game changer and way more effective than any grip for cooling. I have used it during long outdoor ceremonies and it keeps the camera frosty even when pushing 4K 120p for long stretches. Its fantastic! Since you want to be budget conscious, you should also look at the SmallRig NP-W235 Camera Battery and Charger Kit to fill up that grip. They are super reliable and way cheaper than the official ones if you need a bunch of spares fast. Definitely check out some YouTube tests by Pal2Tech about the fan performance... it really proves you dont need that crazy expensive transmitter grip for heat management. Youre gonna crush that Tahoe wedding, dont even worry about it!

Regarding what #2 said about the power bank, that is a solid way to save money but it can be a total cable mess if you're running around a venue. I have tried many different setups over the years and tbh third-party grips for the high-end Fuji bodies are often hit or miss with the high-speed boost modes. Quick question tho before you pull the trigger... are you gonna be mostly handheld for this Tahoe shoot or do you use a monopod? If you are on sticks, there are way cheaper ways to rig this. If you're trying to stay budget-focused, maybe skip the full grip and grab a SmallRig Cage for FUJIFILM X-H2S 3913 with a SmallRig Multifunctional Universal Power Bank Holder 2790. It lets you use any small PD bank you already own. It aint as pretty as the official grip, but it works for a fraction of the price. If you absolutely need the vertical shutter, just bite the bullet on the Fujifilm VG-XH Vertical Battery Grip but look for an open box deal at Adorama or B&H to save a few bucks. The third-party ones from brands like Neewer sometimes struggle to deliver enough current for 4k 120p without the camera throwing a fit.