Sublimox is 300w but switches and on around 50% of the time. I use either a 2800w gen or victron inverter below, I cant stand poor products which ruin a day.
Victron Phoenix Pure Sine Wave Inverter - 12V 500W (VE.Direct-enabled)
combined with a trojan battery below, I can run the sublimox for a few hours easily
24TMX Trojan Battery Deep Cycle 12v 85Ah - Trojan Batteries Online
I find the sublimox a load of hassle with cables, generator or above, gasvap is excellent if well set up, used on low and the new Taylor torch, most problems occur as running too hot. I have recently bought a massive stainless Turkish vap which runs on a big bottle of gas and a large torch, heavy but really really quick, makes the sublimox as slow as the old Varrox.