Power drill off inverter?




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  1. #1
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    Default Power drill off inverter?

    We are planning to go to Richtersveld, SE Nam and Kalagadi area in Sep.
    I have not yet been to all these places but have been to Kalaghadi and as I recall the ground was VERY hard just under the surface.

    Talking getting tent pegs into the ground here ...

    As I recall you need to get the peg through a hard layer just a cm or two below the surface and then seems to go a bit easier.
    (Don't think too much about getting it out again)

    So I am thinking to take my power drill with a masonry bit along to pre-drill through that layer and then hit the peg in with a mallet.

    So why am I posting here?


    My question is:

    Under load will my 1 000 W inverter be able to handle the 650 W drill for any reasonable period of time (drilling through that layer) and, if so, then how much would it drain the batteries or does it only draw 650 W no matter the load?

    Forgive me if this is a stupid question but I am NOT electrically literate - I use what works without understanding it.
    Answering the call of the wild is just so much beter than answering the telephone.
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    Default Re: Power drill off inverter?

    Just test it at home first. The rating is usually continuous worst case, but does not consider start-up current. No load quite a bit less than full load. You might find that the inverter does not like the inrush / starting current, or it might go into protection at startup or under load.
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    Default Re: Power drill off inverter?

    Quote Originally Posted by An3s View Post
    Just test it at home first. The rating is usually continuous worst case, but does not consider start-up current. No load quite a bit less than full load. You might find that the inverter does not like the inrush / starting current, or it might go into protection at startup or under load.
    Totally agree.

    But that is so old fashioned Peter. I don't even know anybody with a drill with a cord. Google Li-Ion

    PS - I think your idea for getting the hole done with a drill is brilliant. I will remember that for next time we do Jozini Tiger Comp. I have spent more time swearing (well actually that's not true, I don't actually swear) and straightening pegs than I care to remember.
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    Default Re: Power drill off inverter?

    If you let the drill run before putting it to the ground to reduce the startup current, or reduce the speed if has that option, it may work.
    Last edited by JLK; 2018/05/14 at 02:39 PM.
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    Default Re: Power drill off inverter?

    I had an old 12V drill lying around and I use it with a 21Ah solar charged battery box which goes along when camping. It is connected to the solar controller's load output, so it cuts out when the amps get too high (8A I think).
    Also handy for diy woodworking projects at home when my other cordless has the screwdriver bit and not the drill bit ...

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    Default Re: Power drill off inverter?

    Quote Originally Posted by JLK View Post
    If you let the drill run before putting it to the ground to reduce the startup current, or reduce the speed if has that option, it may work.
    Agreed. The drill should work fine for this, but let it get motion first.

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    Default Re: Power drill off inverter?

    I used a 650w drill on my 1000watt ( true sine wave ) inverter with no problems.
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    Default Re: Power drill off inverter?

    650w ,12v drill= 54A...take it directly off the battery,don't see a need to go through inverters unless it's a 230v drill machine
    Last edited by hunter26; 2018/05/14 at 03:22 PM.
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    Default Re: Power drill off inverter?

    You did not state if it is a 1000 W pure sine way or modified sine way inverter.

    I suspect it is a modified sine wave inverter but I will cover both.

    The inverters are usually rated for 2x startup current, so in either case you should be covered for startup of the drill.

    1. Sine wave inverter is easiest as it should just work. You will only be drilling for a few minutes, and likely not at full 650W so you should not lose more than a few Ah in the battery.

    2. Using a modified sine wave inverter you will lose a little bit of power as heat as the electric motor needs a sine wave. Once again, considering the little bit of time you'll be using the drill this isn't a problem. However, there is one issue, the speed control of the drill operates on a portion of the sine wave it is expecting, so your speed function may not operate as well as it should as it will trigger on the square portion of the incoming AC. I've played with my 650 W Ryobi on my 800 W inverter and it works just fine for most small jobs.

    Perhaps test it and see if it works well enough on your drill, but I suspect it will be fine for tent pegs.
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    Default Re: Power drill off inverter?

    Yes modified sine wave.
    But if yours worked then it seems I would be OK as well - as you say it's just a few minutes in all and one hole at a time - so resting space in between.
    Also noted the comments about getting the drill rotating first.

    Yes Fluffy I do have a cordless drill but the battery is up to ... and to buy a new one if you can find one is expensive relative to the drill.

    IO have the inverter and the 220v drill anyway so I would just use that.
    Just a bit worried that it may pull my batteries right down.
    Answering the call of the wild is just so much beter than answering the telephone.
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    Default Re: Power drill off inverter?

    Quote Originally Posted by Peter1949 View Post
    Just a bit worried that it may pull my batteries right down.
    Lets make a few assumptions.
    1) You're running at 650 W constant, i.e., max power the whole time which is very unlikely.
    2) We ignore losses due to modified sine wave for convenience. Square wave losses would be around 20%, so modified sine wave would be much less.
    3) 10 minutes constant use, which I imagine is overkill. You probably would only have a few minutes of use effectively.

    650W * 10 minutes / 60 minutes ~ 110 Wh, very roughly 10 Ah used, but actually quite a bit less. Doesn't seem to bad to me.
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    Default Re: Power drill off inverter?

    Quote Originally Posted by Peter1949 View Post
    Yes modified sine wave.
    But if yours worked then it seems I would be OK as well - as you say it's just a few minutes in all and one hole at a time - so resting space in between.
    Also noted the comments about getting the drill rotating first.

    Yes Fluffy I do have a cordless drill but the battery is up to ... and to buy a new one if you can find one is expensive relative to the drill.

    IO have the inverter and the 220v drill anyway so I would just use that.
    Just a bit worried that it may pull my batteries right down.
    I would leave the car running while drilling.
    Cheers

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  17. #13
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    Default Re: Power drill off inverter?

    Why not get a 12v drill machine and use it direct off the battery. It can then be kept in the camping box.
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    Default Re: Power drill off inverter?

    Or you can just go along to your nearest steel works and get them to make up some 14 to 16mm rebar tent pegs, klap them in with a three pound hammer. That's what we do for Afrikaburn in the Tankwa Karoo where the ground is rock hard. Then you've got them permanently available for future trips.
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    Default Re: Power drill off inverter?

    You do not need a drill for your pegs at any of the places you are going to visit; just make sure you have decent long pegs for the sand.
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    Default Re: Power drill off inverter?

    Mata Mata and Tweerivieren Sandy?
    Eco trail yes.
    S.E. Nam?
    Answering the call of the wild is just so much beter than answering the telephone.
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    Default Power drill off inverter?

    I use large 4-5 inch nails with big washers instead of pegs where the ground is hard, but not rocky.
    Works very well, but just take a claw hammer with to get them out.

    Look at pic from Subok per post 5 in thread. 12v drill with broken battery perfect. Rewire with 4mm2 and hella plug to run directly of aux battery instead of internal battery. Wire soldered to where battery made contact.

    If you like your 220v drill, I would not use it on modified sine wave inverter if possible especially if it is an expensive drill. Most Motors do not like it. Went through 3-4 fans on farm in 5 years time and onky used weekends every 2 months and for few weeks over December. Since upgraded to pure sine wave, fans last for 3 years so far.
    Last edited by BennvdmWhk; 2018/05/16 at 08:14 AM.
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  24. #18
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    Default Re: Power drill off inverter?

    Quote Originally Posted by Peter1949 View Post
    Mata Mata and Tweerivieren Sandy?
    Eco trail yes.
    S.E. Nam?
    Yes Peter, all nice sandy areas. Certainly nothing so hard that you need an electric drill.
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