So I've got an important dilemma. 

Currently using a 3 phase borehole pump but loving the rabbit hole that is solar power. 

Currently using an axpert. But moving to sunsynk. 

So the question is do I try source another 2x axpert and retain the 3 phase pump or buy a single phase pump and get the 8kw sunsynk (or perhaps try get away with the 5kw)?

Edited November 4, 20205 yr by Dani
Grammar

The question is, why do you have a 3 phase pump in the first place? Is the motor size such that you only have a 3 phase option?

What size is the 3 phase motor of the pump? You have to allow for inrush current to start the pump. So how many amps does the pump draw in normal running mode? Once you know that, you can then approximate the start up current draw to then work out how much inverter you need to start that load. A soft starter is your friend.

Thx @Delta9 I will investigate the specs of the pump and then post some more details 

This explains a bit about what inrush current is

https://www.facebook.com/2082031392023647/videos/2341453072570941

I have the same requirement. I have been told that a 3 phase pump is much more energy efficient than a single phase. I don't understand why though. Apparently one gets a device that converts single phase to 3 phase? I can only imagine that involves energy loss. Also, replacing the pump with a single phase will cost close to R70 000 so I'm also caught in the dilemma!

Edited November 9, 20205 yr by HeinDuPlessis

Would one of the Aspire pump controllers not be a solution?

http://voltronicpower.com/en-US/Product/Detail/Aspire-Solar-Pump-Inverter#tab_menu1.

I have seen them as advertised Mecer brand in South Africa.

https://mustek.co.za/mecer-aspire/

Thx guys. I'll look into the mecer. Still need to get pics of the pump for more details... It's not at me it's at a family member.