I'm changing out the pump for a pond and I am looking for an objective set of eyes to either confirm that my idea will work or to tell me it won't and why. I've attached a diagram to help explain things.
The new pump (I) is rated 12V 10A and indicates 16A maximum, which I take to mean that when starting up it may/will draw up to 16A. (The old pump was rated for 12/24V and was submersible but didn't work well.)
The pump (I) will be switched on for a period of time (about 10-12 minutes) per hour to pull 100-150 gallons of dirty water from the pond where dirty bits are separated out from the water and then clean(er) water is returned to the pond via gravity.
To handle the scheduling of the pump I am (initially) planning to use an Arduino (D) and a relay (E) to control power to the pump. A sketch in the Arduino will handle signalling the relay.
I've got a Fuse Block (B) that I'm using to also split up the circuit and independently power the electronic bits and the pump.
The pump isn't rated for 24V so I need to step the voltage down to 12V and that is handled by a pair of DC-DC converters that take 24V and output 12V 10A each. (F and G)
My intention at (H) is to take the two 12V 10A lines and tie them together to give me enough amps for the 16A max that the pump may want. I think if I only use one of those converters (F or G) then I'm not going to have enough amperage when it starts up.
Intuitively this makes sense to me but I'm not an electrical engineer so I'd appreciate some feedback on this. I am waiting on some parts so I have wired this all up yet.