TeJon

Hi PanB, i´ll tell you my PlanA for this kind of installs. Here, in Spain, is a very repetitive case when someone who has a house and some trees, need a borehole to water. 
We are going to suppose your pump is a 1.5 kW 3X400 VAC motor. In that case, peak start current would be 6 or 8 times nominal current, so you would need a very powerful low frecuency, which use to be not cheap. SMA, Schneider...
What I ussually do is to install an isolated transformer, which rises voltage from monophase inverter to 380-400 V, which feed a VFD, driver, which obtains 3x400 VAC from 1x400 Vac, that comes from the output of transformer. This scheme allows you to reduce start current to 1.5-2.0 nominal current.
Also, it allows you to modify the frecuency of pump motor, in order to adjust solar power to pump power. As example, if your pump is taking 2 Kw at 50 Hz, and you modify frequency via VFD to 45 Hz, the power needed would reduce to (45/50)x(45/50)*(45/50)x2 Kw = 1.45 Kw. 
 
80

😂 always is better if you  duplicate all the FV stuff...
but wy wife was the buyer and she knows the price she paid... 😎

WoW, I thought you were going to say you had two wives...

Here we go 
 

You are welcome TeJon!

Hi,
I'm a spanish newcomer in the forum, but I've been with the FV for years...
at present time I'm out the grid with:
3100Wp solar panels (mixed mono and poly)
2 x Victron Multiplus 2000/24
2 x Midnite Classic 150
some microinverters (enecsys and chinesse others)
BMV700
12 x TAB Topzs 965Ah C100
Raspberry PI as PV controller
Great forum, I hope to share my experience with all the members... even if my english could be sometimes incomprehensible...
regards
TJon
 
 

Hi,
I'm a spanish newcomer in the forum, but I've been with the FV for years...
at present time I'm out the grid with:
3100Wp solar panels (mixed mono and poly)
2 x Victron Multiplus 2000/24
2 x Midnite Classic 150
some microinverters (enecsys and chinesse others)
BMV700
12 x TAB Topzs 965Ah C100
Raspberry PI as PV controller
Great forum, I hope to share my experience with all the members... even if my english could be sometimes incomprehensible...
regards
TJon