hi. 

i have a borehole of 60m deep. looking to pump water to a 20m distance, so i already have 5kw/5kva axpert inverter running with 1 4kwh lithium battery, 

 

my question is is it better to get the solar pump with control box and solar panel or can the inverter be able to handle a 1kw ac pump?

36 minutes ago, divhy said:

hi. 

i have a borehole of 60m deep. looking to pump water to a 20m distance, so i already have 5kw/5kva axpert inverter running with 1 4kwh lithium battery, 

 

my question is is it better to get the solar pump with control box and solar panel or can the inverter be able to handle a 1kw ac pump?

Is your AXPERT a hybrid inverter? Then it will import what it needs.

You need a pump with a 80m head to do the pumping. Refer to the pump graphs.

I don’t think a <1.5kw pump will give this head. A smaller pump also takes forever to fill a tank up so it will drain your batteries. My pump takes some 30 mins to fill a 5000l tank - but I am fortunate to have a very strong borehole. It is no use to have a big pump that stops and starts because the incoming water is weak.

I have a 2.2kw Franklin pump with a 90m head for a 65m deep borehole. It starts up at 34 a and runs at 15a. On my 4kw inverter it then shows a load of 98%. I know my 9.6kwh Pylontech lithium batteries can handle the startup as it is for some seconds only. 

However, I switch back to municipal supply when I use the borehole pump.

1 hour ago, divhy said:

 

i have a borehole of 60m deep.

I have a borehole of 52 meters deep, pump sitting at 50 meters, its only a 0.37kw capable of delivering 2100l/h. Pump, motor and control box were under R5000, cheapest solar pump I could find was 8k without panels. I won't go for a solar pump if you have PV to spare in your normal system. 

0.37 kw pump runs for less than an hour a day to fill up what I have used the previous day. 

1 hour ago, divhy said:

can the inverter be able to handle a 1kw ac pump?

Yes it will be able to handle it.. depending of coarse , what other loads are drawn at the same time.. 

@Johandup i dont think my 4kwh will be able to handle the start up, my panel in a good day delivers around 1.5kw , i have minimal load on my system, which is only a fridge,tv and dstv decoder.  i also want to fill 5000l tank. of which it will be mybe once in two weeks. 

@Jaco de Jongh i have enough panels to spare as my battery will be full at around 10am, then have 1,5kw floating around all day in a good day. how big is the tank you filling with that 0.37kw pump. i have no massive load on my system, 

 

1 minute ago, divhy said:

how big is the tank you filling with that 0.37kw pump. i have no massive load on my system, 

My Average consumption is about 1500l per day on the days I dont allow the irrigation to run, and about 3500 liters with irrigation 3 times a week. All fed from a 5000 liter tank. I just need to refill what was used the previous day and that normally takes less than an hour a day. 

 

4 minutes ago, divhy said:

@Johandup i dont think my 4kwh will be able to handle the start up

I use to start an 1.8kw lawnmower on a 4kw Infini V and later on a 4kw infini super with no problem. I am confident your 4kw will be able to handle the startup.  

@Johandup thanks, cause i was wondering that buying a solar pump is close to 6k without panels that will need another 4 panels that will be close to 7-8k more,,,, in total around 16k. i rather get electric AC pump if my current set up can handle it.

i will firstly get something  equivalent to 1.5kw and test. first,

2 hours ago, divhy said:

i will firstly get something  equivalent to 1.5kw and test. first,

With an 80 meter head using a Vega pump setup, you can bring out between 1800 and 2100 liter per hour with a 0.75 kw motor. This will fill up an 5000 liter tank in 2.5 hours max and the 0.75k will be much kinder on your solar setup than a 1.5kw pump, but the choice remains yours.. 

Before I started using solar i always wanted the biggest motor for everything, the one that could get the job done the quickest, now I always look for the smallest motor that can do the jod, even if it has to run longer, overall its better for my system.. 

3 hours ago, divhy said:

@Johandup thanks, cause i was wondering that buying a solar pump is close to 6k without panels that will need another 4 panels that will be close to 7-8k more,,,, in total around 16k. i rather get electric AC pump if my current set up can handle it.

i will firstly get something  equivalent to 1.5kw and test. first,

@divhy I am watering a big garden, with 2x5000l tanks and I easily empty it in a few hours.

When the borehole was done solar was not on my radar 🙂

I could have done things differently if it was.

Don’t you have municipal power? If you do you can do things differently.

A pump that can last is top of my list. The Franklin start up with two capacitors and it gives me 3 bar on top. It has probably pumped more than 3 mill liter by now in going 4 years. My house pump shows I have used 850 kl in 3 years. And we are two people in the house.

If the pump needs replacing I will definitely scale down to a smaller one. But there is always a wear and tear factor to consider for a pump that has to run longer. I am a fan of Franklin (at a premium) now.

I use a Dab inverter booster pump to feed the house. Although it is a 1.6kw (I think) it only runs at 350w when it is on. But is has become very very expensive lately.

 

Edited May 10, 20197 yr by Johandup

2 hours ago, Jaco de Jongh said:

Before I started using solar i always wanted the biggest motor for everything, the one that could get the job done the quickest, now I always look for the smallest motor that can do the job

That's funny. Before Solar, my wife would buy the biggest strongest hairdryer too. Now she asks about it... because having a hairdryer during loadshedding turns out to be worth it!

Edited May 10, 20197 yr by plonkster

thanks a lot guys for the info, much appreciated.