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Inverter Advice
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Alex08
 


Member Since: 09 Nov 2006
Location: Glasgow
Posts: 1578

Scotland 
Inverter Advice

Hi all

I'm looking to get an 12v-240v inverter to charge an electric wheelchair in the car. It has a 25V LiIon battery and needs 2.5A charging current. There are several out there which will do the 800W that would give a bit of headroom power wise but they all seem to have a maximum use time of about an hour. The chair can take up to 5hrs to charge from flat although it is more likely in the car that it would be 2/3 to 3/4 discharged.

Is anyone aware of a reasonably priced 800W ish inverter that can run continuously for about 5hrs?

I reckon if anyone knows, they will be on here!

A
  
Post #206740810th Jul 2019 12:01 pm
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Kilovolt
 


Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 466

United Kingdom 2013 Discovery 4 3.0 SDV6 Commercial XS Auto Baltic BlueDiscovery 4

I suggest you get a 1,000 watt unit.

I have dealt with TLC Direct many times over the years.

https://www.tlc-direct.co.uk/Products/TLINV1000ST.html

https://www.tlc-direct.co.uk/Technical/Dat...asheet.pdf

You would need the model marked 651.666UK

At £89-00 (plus VAt & P&P) that is good value. It is a continuous rating.

My concern would be how long a would your battery last with 600 watts for 5 hours (240 volts times your 2.5 amp demand)? I am therefore assuming you are going to charge this on the move? But 800 watts at say 14 volts (engine running) is just short of 60 amps Shocked

That is a big pull and you would need the appropriate fuses and 'man-enough' leads to connect it up.

However...........

What has me curious is the 2.5 amps Question Is that the load on the 240 volts (your assumption) or the charging current going into the 25-volt battery? If it is the battery current then you need a noticeable smaller inverter that you have first assumed Whistle

Just check your maths Thumbs Up Just over half a kilowatt for 5 hours does not sound right.

Just a thought.
 Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything Smile
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power) Smile 
 
Post #206744110th Jul 2019 1:58 pm
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Alex08
 


Member Since: 09 Nov 2006
Location: Glasgow
Posts: 1578

Scotland 

Yes thanks

Its 2.5A at 29V that the mains charger delivers to the battery. So I need only 0.31 A draw from the 'output' side of the inverter.

the input at 12V would be 6A if it was 100% efficient but even if it was 10A it should be OK for the car to deliver. I suppose the inverter really only needs a few hundred watts for headroom but it finding one with the continuous load that I had issues with.

Thanks for the comments - and a suggestion of where to look.
  
Post #206746310th Jul 2019 3:14 pm
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Disco3Ben
 


Member Since: 28 Apr 2017
Location: Buckinghamshire
Posts: 670

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Question for those who understand inverters.

do they deliver charging quicker that a simple USB running off the car battery?

I have a split charge system fitted which runs to a 'USB pane'l in the boot - main aim is to charge camera batteries when filming.
it works perfectly but seems a bit slow, so I wonder about using an inverter to speed things up - or to make it in line with the charge time when plugged into a regular domestic plug socket.


Thanks Smile
 tinted, split charge, D4 rear lights, clear repeaters, RLD spare wheel protector, rear cage, Mantec LL, Prospeed rack and ladder, side steps, Howling Moon Safari 2.1 awning, Altox remote, light bar.  
Post #206768711th Jul 2019 10:25 am
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Browny90
 


Member Since: 19 Jul 2016
Location: Ashbourne
Posts: 523

United Kingdom 2012 Discovery 4 3.0 SDV6 XS Auto Orkney GreyDiscovery 4

might be worth looking at a separate battery and split charge system too?
 Disco4 MY12 SDVS XS Orkney Grey
Defender 90 200tdi Completely rebuilt. 
 
Post #206768811th Jul 2019 10:28 am
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highlands
 


Member Since: 10 Jan 2010
Location: NW Highlands
Posts: 4103

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Bonatti GreyDiscovery 3

Plenty of factors that affect USB charging rate.
I got an inline USB voltage/current monitor so I could see which adapters and, importantly, cables deliver the best charging current...and chucked the cables that weren't up to much.
A lot of panel USB outlets seem behind the curve on charging output.
 Black 05 TDV6 HSE Auto
Grey 05 TDV6 HSE Auto
54 TDV6 SE Man (killed by me Sad
 
Post #206770011th Jul 2019 11:11 am
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Disco3Ben
 


Member Since: 28 Apr 2017
Location: Buckinghamshire
Posts: 670

United Kingdom 2007 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

I have a split charge system in place and a Volt meter in the panel - roughly 13V all of the time.

more concerned about the speed of charging - if an inverter speeds things up or not
 tinted, split charge, D4 rear lights, clear repeaters, RLD spare wheel protector, rear cage, Mantec LL, Prospeed rack and ladder, side steps, Howling Moon Safari 2.1 awning, Altox remote, light bar.  
Post #206774411th Jul 2019 1:35 pm
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