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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3396   
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Hi Clayton, I hope you are saying 500W - 1000W, or 0.5kW - 1kW
Ideally spend the money on a pure sine wave one... but I had a quasi sine wave, and did the job well. I used to run a laptop power supply on it, and never had a problem. Quasi sine wave are a fraction of the price of a pure sine wave. What is good to check is the 'continuous' power. Most will state the peak power which will be close to double the continuous power that they can handle. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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4th Apr 2024 9:13pm |
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| L110CDL Member Since: 31 Oct 2015 Location: Devon Posts: 10728 
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Thank you for the reply, the letters have been sorted
I have looked at the continuous power and 500w is ok but the 1000w would be a safer way to go  1996 Golf Blue 300Tdi 110 Pick up.
Keeper. Clayton. |
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4th Apr 2024 9:25pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3396
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Btw, assuming you are powering everything off a 12V battery, just keep in mind that at 1000W (assuming 100% efficiency - which is never), you will be drawing over 80A from the battery. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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4th Apr 2024 9:48pm |
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| MarkBrown Member Since: 03 Oct 2022 Location: Mid Wales Posts: 442  
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Hello Clayton this is what I use for 18v batteries, been in two years, off eBay. It’s run off a second battery.
 Click image to enlarge |
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5th Apr 2024 9:27am |
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| TexasRover Member Since: 24 Nov 2022 Location: Paris Posts: 1005  
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Don't want to make this overly complicated for you, but managing your car's battery is probably more important. Apart from potentially getting stranded you could shorten the life of your battery, since really the starter battery in your car is not designed to be drawn down.
Ideally you either charge while driving or you have another dedicated battery you either charge at home or somehow connect to the car's charging system (various solution for that). For this application (relatively low amps) you want a use a leisure battery or deep cycle battery where you can use most of the available capacity. |
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5th Apr 2024 10:04am |
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| MarkBrown Member Since: 03 Oct 2022 Location: Mid Wales Posts: 442
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My main battery is connected to the second battery via a voltage sensitive relay, this ensures that I can’t run flat the starter battery whilst using power from the second battery. Hope this helps.
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5th Apr 2024 10:52am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20265 
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Durite do some nice ones, pure sine wave are the best quality but more expensive.
For your purposes modified sine wave would be okay, which is more basic. Only some items are best powered only by pure sine wave inverters. A soar panel and MPPT controller maybe helpful, but is more complex to deal with and set up. (With a separate battery). As always fusing close to the power source is most impacting for safety sake, but other than that you are good to go. Best to stick to continuous use wattage or current draw figures to be safe, peak figures are usually only intermittent and heat and excess load is not a good idea. I’d imagine most 18v battery chargers pull about 300w max at 240v, most are quite efficient chargers. For simplicity perhaps something like this might work: https://www.ebay.co.uk/itm/166198612170?ch...gJVfvD_BwE But depends on the time behind the wheel and how long it takes, so long as battery voltage doesn’t drop too low you’ll be okay. |
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5th Apr 2024 2:35pm |
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| L110CDL Member Since: 31 Oct 2015 Location: Devon Posts: 10728
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Thank you for all your reply's
I was hoping that i would not have to go the way with a second battery. I was hoping that running the engine on tick over while charging the battery's would be enough to keep the battery charged enough not to run it down so i would not be able to start her, would this be ok or i do need another battery ? TIA 1996 Golf Blue 300Tdi 110 Pick up. Keeper. Clayton. |
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8th Apr 2024 8:03pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20265
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Yes, you can do that, but would have to be off the highway.
Do you know what your Alternator produces? At idle the current produced is usually a bit lower than specified Amperage but should be fine for what you want for sure.  |
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8th Apr 2024 9:53pm |
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| db950 Member Since: 01 Feb 2012 Location: Lincoln Posts: 560 
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No need to over complicate things if not necessary!
We have a 300w pure sine wave Bestek from Amazon in 6 of our work vans solely for charging our dewalt batteries. We don’t run the fast charger on them just the standard one. It only runs off the standard van battery and I don’t have the van running when in use on site. I’ll often leave it switched on overnight after forgetting to turn it off and it’s never drained the battery enough to not start the van. Click image to enlarge Click image to enlarge 1997 Ex-MOD 110, Pop Top Camper, build thread https://www.defender2.net/forum/topic72352.html 2014 Discovery 4 SE Tech Instagram @the110camper |
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9th Apr 2024 8:33am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17310 
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If you do go down the route of leaving the engine running to keep the vehicle battery charged then I suggest also fitting a run-lock system so that you can remove the keys and lock the vehicle, they are not particularly expensive.
Contrary to popular belief it is legal to leave a vehicle engine running indefinitely when stationary if it is necessary to power systems on the vehicle (electrical or hydraulic), although the vehicle should not be unattended if so left (that doesn't mean that you have to be in the vehicle, but you have to be in the vicinity of the vehicle). This is how the emergency services are able to do this - many police vehicles are left running to power the communications and datalogging systems (which in turn led to the notorious problem of BMW engine failures killing police officers, the failures being attributed to lubrication problems arising from long periods of running at idle). It is however unlikely that charging power tool batteries for use away from the vehicle would be considered a necessary purpose since the batteries are not part of the vehicle or its immediate systems. You might for this application be better off investing in a stand-alone petrol, diesel, or LPG generator, or simply investing in more tool batteries and charging them overnight at home. |
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9th Apr 2024 8:34am |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3396
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Or park downhill so you can bump start it
The battery will not thank you, but you get to sleep at home. I think some inverters even have a low battery cut off. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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9th Apr 2024 9:14am |
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| db950 Member Since: 01 Feb 2012 Location: Lincoln Posts: 560
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We do also have a full system on board comprising; run lock system, 12 to 24v split charge with 2 on board batteries, 24v to 110v 3000w inverter (24v to work on commercial vehicles/trailers and run a 24v suit case mig welder) so least I can self jump start if needed
But the little set up for battery charging works fine, unless of course you are needing to run multiple chargers all day then a second battery will be needed. 1997 Ex-MOD 110, Pop Top Camper, build thread https://www.defender2.net/forum/topic72352.html 2014 Discovery 4 SE Tech Instagram @the110camper |
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9th Apr 2024 9:34am |
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| L110CDL Member Since: 31 Oct 2015 Location: Devon Posts: 10728
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Thank you all for your replys
@ custom90 off the highway and i think it's just the standard alternator that came with her
@ db950 thanks for the pics as well
@ blackwolf our store is in a old farm yard and Millie would be running just outside our store, this is private land and only the farmers come into the yard
@ Dinnu  i will look into the low battery cut off 1996 Golf Blue 300Tdi 110 Pick up.
Keeper. Clayton. |
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10th Apr 2024 8:38pm |
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