A portable solar generator is an investment in peace of mind during grid failures. Aim for a model with a LiFePO4 battery, as these last for thousands of charge cycles and will serve you for years instead of months.
Tech companies often release new versions in late summer or fall. If you buy in the spring, you can find last year’s model at a significant discount without losing any essential features.
That 0% window is a deadline, not a free pass. If you do not pay off the full $1200 before those 18 months are up, you will be hit with the standard interest rate on whatever balance remains.