And how many…?
A 1A supply is enough for a SINGLE heat strip drawing 12W
If you’ve got two 12W and two 7W strips, you’re trying to draw 38W/12V = how many amps?
To which your power supply should probably respond with “fuck you buddy!” (Rather than just catching fire…)
Edit: which reminds me I have to go have a very firm chat with a VFD that believes it’s acceptable to draw 61A from its 50A breaker to achieve the same goals as its buddies manage with 40A. I can nay get the power Captain!