Inverter for Nissan leaf 24kwh to run water blaster

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gchiu

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#280731 7-Jan-2021 08:11

I've got a few headstones to clean at the local cemetery and it's a bit tedious using my battery powered water blaster. It works but just takes time.

I could hire a gasoline powered water blaster but how about an inverter to connect to my 2nd hand 2014 leaf with 24kWh battery? I see that there is a Bosch water blaster that says it draws 1500W https://www.mitre10.co.nz/shop/bosch-waterblaster-1500-watt-120-bar-green/p/347482 and it uses an enclosed water tank which makes it an option if I get too far away from the taps.

Would I just need a 2kW pure sine wave inverter attached to the 12V battery?

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#2631452 7-Jan-2021 08:28

I don't think its financially viable? A good quality 2000W pure sine wave inverter would be in excess of $1,500 - $1,800. Don't be fooled by cheaper inverters that claim to provide 2000W. They might be able to provide surge capacity to 2000W for short periods but a water blaster will draw that 1500W continuously.

Here's an example

https://www.burnsco.co.nz/shop/12v-electrical/distribution/inverters/projecta-inverter-2000w

gchiu

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#2631467 7-Jan-2021 08:57

It wouldn't be totally a waste as I could then use the Leaf for emergency power in a black/brown out.

But do I really need a pure sine wave to drive a pump?

Eg: https://www.jaycar.co.nz/1500w-3000w-12vdc-to-240vac-modified-sinewave-inverter/p/MI5310 $279 modified sine wave

wellygary

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#2631468 7-Jan-2021 09:02

gchiu:

Would I just need a 2kW pure sine wave inverter attached to the 12V battery?

No. No No...

The leaf has two electrical systems one for accessories etc ( that's the 12V battery)

The traction motor runs off a 3-400V DC feed from the big battery....

Essentially you are talking about retro fitting a Battery to Grid feature.... this will not be cheap.... or easy....

compound

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#2631471 7-Jan-2021 09:10

A 1500W motor will have a start current averaging three times the run current. You would need 4500W inverter to reliably start this motor if not larger.

gchiu

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#2631477 7-Jan-2021 09:25

Don't these things have capacitors to help start them?

The leaf's DC to DC converter maxes out at 1800W.

elpenguino

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#2631482 7-Jan-2021 09:34

gchiu:

Don't these things have capacitors to help start them?

The leaf's DC to DC converter maxes out at 1800W.

Induction motors do indeed have a start capacitor, in order to run from one phase of AC electricity, but that's not going to help ease your surge of starting current, which is still an issue for a motor whether it be AC or DC.

What you have suggested is doable but by far the quickest, easiest and cheapest thing is to use another power source such as a petrol or (external) battery powered water blaster (or electric water blaster with generator).

Can you scrub the stones by hand / with chemicals?

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#2631541 7-Jan-2021 10:15

As others have said, the key issue is going to be the surge current drawn to start the motor. induction motors typically draw 2 - 3 x their rated power to start. Hard to know exactly the start / stall current unless you have access to the engineering datasheets, or can test an inverter to see if it starts.

No issue when on the grid as the grid has heaps of momentum and and wiring can easily supply 4x + the rated current for a few hundred milli seconds.

No idea the viability of fitting a little soft starter

Induction motors will run very hot on modified sine wave power, so pure sine is recommended.

Note that if it is a cheap water-blaster it may have a universal motor, rather than an induction motor and different rules apply.

wellygary:

gchiu:

Would I just need a 2kW pure sine wave inverter attached to the 12V battery?

No. No No...

The leaf has two electrical systems one for accessories etc ( that's the 12V battery)

The traction motor runs off a 3-400V DC feed from the big battery....

Essentially you are talking about retro fitting a Battery to Grid feature.... this will not be cheap.... or easy....

The leaf has a DC-DC converter that can send 135A to the 12v battery, so for cira 1.5kW load's you really can just hook up a 12v inverter. Obviously the car needs to be in ready mode, and 1.5kW (although that is close to the limit so all accessories (seat heater, headlights, interior fan etc should be off).

outdoorsnz

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#2631673 7-Jan-2021 11:33

IMO. You'd be better spaying it with 30 seconds spray and walk away or one of the very similar many other products on the market. Then let mother nature do the work for you.

You would want to be pretty careful water blasting as you could quite potentially damage the headstone surface.

Zeon

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#2631676 7-Jan-2021 11:48

There are units which can connect directly to the battery via the CHAdeMO port and in some cases provide like 6-7KW+.

E.g. this unit:

Probably pricey for this one small job but you can use it to power your house during a blackout also I suppose:

http://www.setec-power.com/product/3kw-vehicle-to-home-v2h/

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gchiu

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#2631683 7-Jan-2021 12:03

outdoorsnz:

IMO. You'd be better spaying it with 30 seconds spray and walk away or one of the very similar many other products on the market. Then let mother nature do the work for you.

You would want to be pretty careful water blasting as you could quite potentially damage the headstone surface.

I used Wet and Forget last year and came to see what happened. Nothing. The lichen was still clinging to the granite.

A water blaster at low pressure is fine on granite .. I wouldn't use it on marble or other soft stones. Or, if there were lead lettering present.

gchiu

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#2631685 7-Jan-2021 12:06

Zeon:

There are units which can connect directly to the battery via the CHAdeMO port and in some cases provide like 6-7KW+.

E.g. this unit:

Probably pricey for this one small job but you can use it to power your house during a blackout also I suppose:

http://www.setec-power.com/product/3kw-vehicle-to-home-v2h/

Interesting. I didn't know such products existed except for the V2H stuff that Nissan was making. I've asked for a price but expect it will be too expensive.

And it is expensive at USD3500 trade https://inverter.en.alibaba.com/product/60714197307-804276068/vehicle_to_home_V2H_3KW_SETEC_POWER.html

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dt

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#2631737 7-Jan-2021 13:29

not exactly what your asking for but another option is you can pickup a cheap second hand petrol generators on trademe.. there are even new ones reasonably priced depending on budget for this work

gchiu

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#2631786 7-Jan-2021 15:00

The problem is I already have a battery operated one, and an electric one as well. So, a gas operated one seems a little over the top for me. And the dead aren't going to reimburse me for the work!

dt

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#2631803 7-Jan-2021 15:26

I was meaning a petrol portable generator that you could plug your electric waterblaster into, can pick second hand ones up for as little as $80.

Might mean you could get it into places you wouldn't normally be able to get your car to if thats a potential problem too

gchiu

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#2631943 7-Jan-2021 17:44

Maybe I should just content myself with a small inverter that I can connect to the leaf 12V battery that can charge the water blaster battery.

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