Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Please note that it is not permitted to have referral links posted in your signature. Keep these links contained in the appropriate forum. Thank you.

https://www.boards.ie/discussion/2055940817/signature-rules

12v inverter to run off EV in power cuts

  • 25-01-2025 11:28AM
    #1
    Registered Users, Registered Users 2 Posts: 354 ✭✭


    Hi folks. I'm looking for recommendations for a 12v inverter to run off the EV. Getting a lot of power cuts lately and it'd be great to be able to keep a few bits running off the car (e.g. phones, wifi and tv). Unfortunately my E-Niro doesn't have a 3 pin socket.

    Would something in the 800w - 1200w range would be the sweet spot? Have read that a pure sine wave inverter is better for running electronics. Greatly appreciate any advice.



«1

Comments

  • Registered Users, Registered Users 2 Posts: 9,833 ✭✭✭CMOTDibbler


    There are a lot of potential issues with this. You can run an inverter off the 12v (cigarette lighter) connection, but these are limited to (I think) about 300w. The other option is to connect to the 12v battery with crocodile clips, but the question arises as to whether the car will continue to charge the 12v battery to stop you flattening it.



  • Moderators, Society & Culture Moderators Posts: 42,461 Mod ✭✭✭✭Gumbo


    I have one. Never used it.

    I don't trust the continuous draw from the ciggy lighter to be honest, even at relatively low levels.

    If i lived in an area with power cuts, i'd really be looking at a car that has V2L like a Kia, BYD Seal etc



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Thanks for the quick responses. Unfortunately, we're not in a position to upgrade the car at the moment.

    The intention is to hook up the inverter directly to the 12v rather than the cigarette lighter as the lighter would likely blow its fuse.

    Would the utility mode in the E-Niro help with the continuous draw concern? It keeps the car powered on (drive is disabled) and keeps the 12v battery charging. Lots of owners have used utility mode to boost their 12v battery if it went flat as it provides a constant charge.



  • Registered Users, Registered Users 2 Posts: 3,829 ✭✭✭joe1303l


    I think for what you’d end up spending on a worthwhile inverter, you’d get a secondhand petrol generator that would do the same job.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Ah ok, fair enough. Was hoping the inverter would have been a runner as it'd be handy for trips with the family also.



  • Advertisement
  • Moderators, Society & Culture Moderators Posts: 42,461 Mod ✭✭✭✭Gumbo


    The basic ones are cheap enough but wouldn’t be something I’d use long term. Emergency situations etc maybe.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Yeah, I was looking at some on Screwfix and Halfords which would prob be ok for certain things but they're modified sine wave from what I can see. That's double dutch to me tbh but a quick Google tells me pure sine wave versions are better for electronics like a laptop, router etc.



  • Registered Users, Registered Users 2 Posts: 9,833 ✭✭✭CMOTDibbler


    For trips with the family, you'd be better off buying 12v appliances and not bother with an inverter.



  • Registered Users, Registered Users 2 Posts: 8,374 ✭✭✭The Continental Op


    I bought this 3 years ago for a solar set up (price has hardly changed)…

    https://www.amazon.co.uk/Victron-Energy-Phoenix-Inverter-VE-Direct/dp/B082PY64X7/

    Think I had to buy the ve cable to set it up.

    Its a good quality item but I've hardly used it so can't say I've given it a lot of testing.

    Wake me up when it's all over.



  • Registered Users, Registered Users 2 Posts: 3,041 ✭✭✭Buffman


    I tried it a few years ago with an Outlander and a generic cheapy inverter from Ali, around 2000W IIRC. Never maxed it out in anger so can't say for sure what it's actual rating was, but it ran an 800W angle grinder OK anyway.

    Luckily the Outlanders 12V battery is in the boot with plenty of space for messing around with connecting. Doesn't have any sort of utility mode or anything so have to make sure it's fully switched on and 'Ready' to go to keep the 12V charged from the main battery via the DC-DC converter. Parked behind locked gates so theft wasn't a concern.

    Never really had to use it in anger luckily as it was 'plan C' after solar and generator, but was nice to have as a backup backup.

    The below is a general 'signature' and not part of any post:

    FYI, if you move to a 'smart' meter electricity plan, you CAN'T move back to a non-smart plan.

    You don't have to take a 'smart' meter if you don't want one, opt-out is available.

    Buy drinks in 3L or bigger plastic bottles or glass bottles or cartons to avoid the DRS fee.



  • Advertisement
  • Registered Users, Registered Users 2 Posts: 4,494 ✭✭✭...Ghost...


    I think for what you are talking about, one of those small solar battery units would be ideal. I wouldn't be running a TV off of it, but for charging mobiles, laptops, or having the Wi-Fi plugged in, it would be ideal.

    The next level up would be a used hybrid inverter. Something like a Solis 3kW and 15kWh battery from the likes of Fogstar. Could be done for about 2 grand and you could charge the battery on your cheap night rate and use that power during the day if you wanted to, or just dump it to the grid every night for export before charging it up again on cheap leccy. You could make it pay for itself.

    Stay Free



  • Registered Users, Registered Users 2 Posts: 1,736 ✭✭✭celtic_oz


    if you have access to a VAT number you can buy from here VAT free, so the below would be €230 for example

    Link

    image.png

    Battery capacity in Wh

    505 Wh

    Output USB

    2 x USB-A port: (2x) 5V, up to 2,4 A (12 W max), regulated
    1 x USB-C port: 5V - 12V, up to 3A (18 W max), regulated
    1 x USB-C PD port: 5V - 20V, up to 3A (60W max), regulated (input/output)

    Output DC

    12 V Car port: 12 V, up to 10A (120 W max), regulated
    12 V port 6 mm: 12 V, up to 10A (120 W max)

    Output 230 V

    1 x AC 230 V (EU version)
    total max. 300 W continuous load
    total max. 600 W peak load

    from the description : "The Yeti 500X can be charged in different ways. Needless to say, you can charge the Yeti 500X by means of a regular wall socket within 8,5 hours using the included charger. Additionally, the Yeti 500X can also be charged using solar panels. The integrated MPPT (Maximum Power Point Tracker) charge controller ensures an optimal charging process. The Boulder 200 fully charges the Yeti 500X in 6 hours on average. The Yeti 500X can also be charged via a 12 V car outlet using the Goal Zero 12 V charging cable."



  • Registered Users, Registered Users 2 Posts: 9,833 ✭✭✭CMOTDibbler


    Or alternatively for not much more

    image.png


  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Thanks for all the suggestions. Bit disappointing that is not as straight forward as I had hoped!

    I have solar panels on the house with a very small battery. Should really have gone for a much bigger battery and I must look into getting a changeover switch to allow the solar to work in a power cut.



  • Registered Users, Registered Users 2 Posts: 4,494 ✭✭✭...Ghost...


    There is your answer. Get a bigger battery. If your inverter has an AC Out, you can run a socket from it to run the items from your OP.

    Stay Free



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Yeah, that's exactly what I was doing yesterday. But the battery is only 4.4kwh so it doesn't take long to get down to the 20% shut-off as the inverter alone seems to pull a constant 100w.

    Was hoping the car inverter route was possible as it'd be a much cheaper means of access to a large capacity battery.



  • Registered Users, Registered Users 2 Posts: 9,833 ✭✭✭CMOTDibbler


    Well you could always buy a used EV battery from EV breakers. Prices from below 2k. Although hooking it up to your inverter wouldn't be a trivial matter.



  • Registered Users, Registered Users 2 Posts: 2,038 ✭✭✭kanuseeme


    Bought a 1500w/max 3000w pure sine wave inverter about 5 years ago, never really used it for the home, used it more for work/office and water pump at least once a year, house is connected to the work water pump.

    Basically I found that kids were fine on tablets, wife could provide wifi, the pump would be connected 2 or 3 times a day to fill cisterns/ flush toilets, gas used for tea and cooking.

    No power cut longer than 10 hours.

    Handy little device, its still in its original box kept in a press ready to go, 2 clips on the 12v, switch the car on, I would use the water pump first, then lighter loads, I would turn the car on every hour or so.

    5 minutes to set up, run extension to where its needed and plug it in, very simple and clean, no need for refuelling or hauling 40 kg out of the shed, even got one for my mother, showed her where to connect it on her car.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Yeah I wouldn't be at all capable or confident doing this unfortunately.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    This was my line of thinking - quick, easy and clean without having to run a noisy generator or store petrol. But based on the advice here it's prob not ideal with an EV.



  • Advertisement
  • Registered Users, Registered Users 2 Posts: 9,833 ✭✭✭CMOTDibbler


    I think range therapy do it. Worth checking out if you're interested.



  • Registered Users, Registered Users 2 Posts: 9,833 ✭✭✭CMOTDibbler


    Only if the vehicle supports V2L. Many don't. Including the e-Niro.

    Edit: The newest model does.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Yeah I've the previous model E-Niro which doesn't support it unfortunately.



  • Registered Users, Registered Users 2 Posts: 7,347 ✭✭✭zg3409


    An inverter can work. It needs to be connected directly to the 12 volt battery and the car needs to be on or in utility mode. You need to overrate the inverter for any potential load and keep the total load down while using it. You also need to be careful to waterproof it from rain or sideways rain and any plugs or sockets are kept dry. Most cigarette lighters in EVs are limited to 120 watts max. You could easily draw 2kW direct from 12 volt battery but I would avoid crocodile clips and use VERY heavy gauge wires to connect to 12 volt as you could be looking at 200 amps. Be sure to not have anything connected when you turn inverter on or off as it's these spikes that can damage your equipment. I don't think pure sign wave inverters are anything different to modified sign waves with a lie added.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Cheers, that's pretty much what my line of thinking was before I started this thread. There's not much consensus here though on whether it's a good or bad idea.

    This was one of the options I was considering until I read about the sive wave variants.

    https://www.screwfix.ie/p/maypole-1000w-12v-to-230v-power-inverter-type-a-usb-charger/113fy

    Edit: this was in response to @zg3409 above.



  • Registered Users, Registered Users 2 Posts: 7,347 ✭✭✭zg3409


    1000W may be bit tight for heavy loads that come on and off like oil burners and their associated water circulation pump. That would be enough for low power essentials but not a kettle nor any sort of electric heating device. Make sure connections are well made and electrics don't get wet.



  • Registered Users, Registered Users 2 Posts: 186 ✭✭Tradnuts


    Looks like you are in the same boat as myself, also with an e-niro that doesnt support VTL and also like you I was using the double socket directly from the invertor. Kettle all day, toaster etc, microwave for lunch and the chest freezer inbetween these. Used it for about 12 hours and still have 92% remanining on the battery when the grid came up online.

    I've a 15kwh battery bank. I was really impressed i must say.

    My advise to you is spend any money getting a bigger battery, and mayeb get a changeover switch too for convenience. But really, the socket from the inverter is pretty cheap alternative that gets you out of a pickel.



  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    Yep, would only be using it for TV, internet and other relatively low demand electronics. Could potentially keep the chest freezer going too but I'd need to check the peak start-up draw from it as that might be too high.



  • Advertisement
  • Registered Users, Registered Users 2 Posts: 354 ✭✭Redlim


    I definitely need to look into expanding my solar battery. Could easily get a few days running those few bits if I had that kind of capacity.



Advertisement