Water pump amp draw?

I've got a 1995 trailer, and the water pump is rated at 4A. I have measured it at 3.4A while pumping. So... if I ran it for 1 full hour, it would draw 3.4Ah.

I'd be surprised if it saw more than 10 or 15 minutes a day total - that would be less than 1Ah per day for the water pump.

There's some numbers for you.

CC

What size is your battery, and is it a true deep cycle?
Water pump is minuscule. Have you added fridge, water heater? Still a draw even if on propane.
Typically, 1 watt of solar per 1 amp of battery.

marquette wrote:
I am researching installing solar on my 1987 Scotty retro camper. It is currently put away and winterized and will be for at least another month. I converted it to LED lights last year. It has no micro wave, coffee maker, etc. so the only real draw is the water pump. So if anyone knows what the water pump draws I can try to figure out my daily battery usage to determine how much solar I need and if it is practical for boon docking with the trailer. It has a 12 gal water tank and we can go 3 days on a tank of water so I assume the water pump will pump 4 gallons a day.

I can't imagine your water pump significantly affecting your battery drain. Even if it draws as much as 10 amps, with a 12 gallon tank and a 3 gallon per minute pump your tank would be empty in 4 minutes. 4 minutes of water pump usage at 10 amps equates to about 2/3 of an amp hour out of your battery. Not even worth the bother to figure it.

You title it about amps, but you ask about amphr.
Too many variables to give you firm answer, but I don't think 4 gallons a day will put dent on your battery power.
I hesitate to put solar as I camp in the shades and drive under branches a lot, but even with 30 gallons of water and older lights, single battery would last us 3 days.
I was carrying old 40W panel on few occasions and set it on the ground, what was sufficient to keep the battery charged for the day.
No fridge?
Than if you really want to know, put amp meter on the line and test pump 1 gallon catching time as well. The amps will change with delivered pressure, but you will get starting point.