DELTA Max's ability to run these devices depends on their specifications(wattage/voltage/current). If the specifications are within DELTA Max's AC output (2400W total [Surge 5000W[), then in theory it should be able to run them.
We have tested DELTA Max on a 40W CPAP and it was able to run it using AC output ports for 34 hrs. We also tested it on a 2200W electric heater and it was able to run it using AC output ports for 0.8 hrs.
You can contact our CS on this contact us, with the specifications of your heater and CPAP, and they will help you check if DELTA Max is compatible with them.
Since you want to take it on ice-fishing trips, you have to keep in mind that the product isn't waterproof and you need to keep it dry. And note that DELTA Max can only function under certain temperature levels. Discharge temperature: -4°F to 113°F, and Charge temperature: 32°F to 113°F.
Anything above or lower than that range will affect the power station's ability to charge and discharge.