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Any inparticular?

Something we looked some time ago as a service (rescue van) but doesnt seem to have a large enough market at present - people simply aren't running out of charge!

Two options are a generator to evse or battery pack to inverter to evse.
 

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I looked at them online, but unless you have a spare can sitting around, I can't see that they are aimed at end users, more aimed at garages, and breakdown/recovery firms
 

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Yes they are a commercial product, the main offering is from a company that is now owned by Chargemaster.
They are just too bulky to use and are really a get you started and on the move option, they cant give you a big charge. Thats not the object.
 

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I saw somewhere the AA have a couple of specialist recharging vans. Can't find the link, but my understanding was they are designed to give you enough of a boost to get you to the nearest charge point.
 

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Since with a normal breakdown you have to wait for the transit van aa man to turn up and then wait again for him to call one of their small number of low loaders or similar, there is probably not quite such a gap anyway between that and simply jumping straight to them sending one of their handful of 'charge vans' out.
 

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Since with a normal breakdown you have to wait for the transit van aa man to turn up and then wait again for him to call one of their small number of low loaders or similar, there is probably not quite such a gap anyway between that and simply jumping straight to them sending one of their handful of 'charge vans' out.
I would imagine that the AA's "small number" of low loaders might amount to hundreds given that they claim to assist a motorist every 9 seconds, whereas we're advised earlier in this thread that they have two mobile rechargers. Towing would seem to be much quicker.
 

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Hmm, last time I had recourse to the RAC I waited nearly four hours for the transit van and then another four for the low loader. Not convinced that they helped 3200 people before me :)

But yes, there are probably more than two low loaders for the country. I wonder how much current one could draw from a Transit van + inverter?
 

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If you need an emergency charge then your vehicle has shut down, towing wont work. You will also find that unless the vehicle is able to drive and has been driving, regen does not kick in.
The AA and RAC in general wont flat tow an electric vehicle, but virtually all the AA vans have a fold out towing dolly on board, so they can simply take you within a limited distance. Im not sure but I believe some of the breakdown organisations charge for provision of petrol to people who have run out, I would think they would also reasonably charge you for dealing with a car that has run out of power.
 

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One thing that is rarely considered is that although you would need a 3kW or so inverter to charge an EV from a van at 240V (and this is not likely to be available) you could always try 110V 10A which would work with a 1.5kW inverter. I wonder how viable this would be for a van with 24V electrics? It would only charge at about 4 miles per hour, but chances are you are not far from a 240V socket!
 

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Be warned. Some 12v/24v inverters and generators can damage your charger. Some of the cheaper ones wont deliver anywhere near the advertised current, and the waveform (Called modified sine wave) is actually a series of square sections of + or - Voltage changing in voltage at each step up and down the sine wave, some of these are very dirty in waveform terms, and often wont run motors etc. The cheaper generators are also of a very poor sine wave with plenty of spikes. These do see off chargers. Dont use any generator unless its at least 6kw, and the only way around the poor waveform on a small generator is to use an inverter generator of decent make, ie Honda. These create the sine wave electronically and the frequency does not change with load. Some charger makers wont support any charger used on a small / any generator other than an inverter/ large site style. A companyy I work with to support their EVs used as film camera tracking vehicles have damaged a number of chargers by doing this. The only safe genny is one that at least two people cant lift and has a output capacity you will never use. On site demos of EVs always use large site gennys, its the only safe thing to do.
So be warned
 

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For an inverter to produce 3kw at 240v or 110v would take around 250 amps at 12v and that's not taking into account losses. That would have to be a very large alternator on the AA van.
 
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