Mounts and their accessories are small, fussy, all-night loads, which is a different sizing problem from running a kettle. Three things decide it: total watt-hours, whether you can stay on DC, and how much the unit wastes just being switched on.
Do the watt-hour maths
List every device and its draw, multiply by the hours you will actually be running, and add margin. A tracking mount is usually a modest continuous draw. A cooled camera and its cooler is larger and runs the whole session. Dew heaters are the ones that catch people out — they are resistive, they can be the biggest single load in the setup, and they work hardest on the damp, cold nights you most want to be out.
Then add margin for two reasons. Lithium capacity delivers less in the cold, and finishing a session at zero is how you shorten a battery's life. Half again over your calculated figure is a sensible target.
Stay on DC where you can
Most of this gear is natively 12V. Powering it through the inverter converts 12V up to 120V and back down again in the device's own adapter, and you pay a conversion loss twice plus the inverter's standby draw all night. Use the station's DC outputs and a cable with the right barrel connector instead. We stock the BLUETTI cigarette-plug-to-barrel cables for exactly this; the listing offers several versions, so match the version to your unit and check your device's barrel size and voltage before ordering.
Standby draw matters more than you think
A station that idles at several watts will quietly consume a meaningful slice of a small battery over an eight-hour night. Our Elite 30 V2 listing states a standby draw of 4.5W, 288Wh of capacity and 600W of output, with nine outlets including a 140W USB-C port and a noise figure under 30dB at light loads. For a light setup on short sessions that is genuinely enough, and it is the easiest unit to carry to a dark site.
When to go bigger
If you run dew heaters all night, or a cooled camera, or you also want to charge a laptop and keep a hotspot alive, step up to the 1kWh class. Our Elite 100 mini listing quotes 1,004.8Wh with 700W of output across nine ports, including six DC outputs, and cells rated by Bluetti at 6,000+ cycles. The Elite 100 V2 is the same capacity class with 1,800W of AC output if you also want mains-level headroom, and our listing quotes over 4,000 cycles and a 10ms UPS switchover.
One practical check
Confirm the DC output voltage and current limit of the port you intend to use, not just the station's total output rating. A mount that browns out mid-session is usually a port limit or a cable, not a flat battery.
Genuine BLUETTI, shipped direct from Bluetti's US warehouse and sold by RV Parts Giant in Upland, California.