Hi, I am looking to set up a system to pump water from my well using a 220v ( about 6.5a) water pump (400' + deep) I have 6x100w panels and a 206ah SOK Battery and have ordered another 200ah battery...
I would like suggestions on a 12v or 24v inverter to use for this.
I am thinking it would be best to only have the pump turn on when the sun is out so it doesn't use up the battery, what is the name of the switch I would use for this?
Thanks
I'm sorry, but I think you are going to get a really bad reality check. This system might not even get the pump started, let along keep it running for any significant amount of time.
Too small a battery, and FAR too few solar panels. I'm speaking from experience here, having successfully running a 240VAC pump for years now.
Here is what you really need. Let's assume your pump needs 6.5A at 240VAC, which works out to be 1560W, running. Let's assume your starting wattage is 3.8X, which is what my pump's starting ratio is. So you need 1560W X 3.8X = 5920W at startup. So, an inverter that an surge to 6000+W for >1 second (1000 ms).
A good rule of thumb is you need 2X the number of panels for the load you want to run. So, for a 1560W load you need 1560W X 2X = 3120W of panels.
For batteries, you need to have at least 8X capacity for lead-acid, and 4X for lithium. So, with a 24V system that works out to be...
Pb: (1560W/24V) X 8X = 520Ah battery
Li: (1560W/24V) X 4X = 260Ah battery
So what you need is ~3000W of panels, a 260-520Ah battery bank, and an 120/240 split-phase inverter that can surge to 6000W. Take a look at the Conext 4024. I use that for my workshop.
BTW, my 48V system, with 4500W of panels and 375Ah battery can run my 1hp 240VAC pump from 8am to 4pm throughout the whole growing season.