Towing with an EV - trip report

ChocolateTrees replied on 26/11/2021 10:44

Posted on 26/11/2021 10:44

Warning - Very long post alert!

Towcar - Polestar 2 LongRange Dual motor Launch edition. (300kW motors (408ps) , 78kWh battery)
Caravan - Bailey Unicorn Vigo S3 Max weight upgrade.
2 Passengers on way - me and SWMBO - 4 on return (daughters joined us mid trip).
Start - Towcester in South Northants. Destination Borrowdale cub site in the Lake district.

7:00am 100%
We left home on the Friday morning (22nd Oct) at about 7:00am Car was charged to 100% over night and preconditioned using mains power. Roads were damp but clear skys and about 8C. Our route planned was A43 to M1, M1 to M6, M6 to Penrith and then down to Keswick and the site. I had planned for two charging stops, the 1st near Stoke on Trent and the second around Lancaster.

We got going in fairly light traffic until joining the M1. When towing with the EV, I set cruise at 56mph, but as soon as I find a big lorry, I tuck in behind it for slipstreaming and follow it. If a faster lorry comes past, I will pull out and follow that.
Progress was fine with a minor slow down on the M6 near J3, and good all through Birmingam. From getting started, I was watching my economy (kWh/100miles is how the car displays it) and looking for a number below 67 (lower is better) - my target for the journey. By Birmingham the number was at about 60 and I was very comfortable with a 2 stop strategy. Unfortunately, as we drove we were getting reports of major congestion on the M6 after Stafford with major queues. While that would be good for the EV economy - not so good for arrival time, so we opted for an early pit stop in Stafford services.

9:00am 35%
Stafford Northbound has two new Gridserve chargers and I had already looked at the location in the carpark. Ignoring the "caravans here" sign, we headed for the main carpark and found a quiet spot away from the cafe area near the white vans that accumulate there. Unhitched the van in a space, and I drove the 50 meters to the charger. One was in use and I popped the car on the other, starting the charge at 9:09. After 2 hours on the road I was ready for a coffee and cheeky bacon sarnie, so Greggs did the job. My wife and I took turns to head in and use the facilities, while the other guarded the van (corner steady down, sat inside). I consumed my coffee and food, opted for a second bathroom break and then we were ready to go again. 40 mins of charging yielded 34.7kWh (half a battery) and 72%. The charge was pretty slow by my cars standard averaging about 40kW


9:50am 72%
We hit the road again and battled through the rest of the M6 hold up with some rain kicking in. While in Stafford, we had decided to stop at Crow Orchard, a new 8 station charging hub South of Charnock Richard or - if the battery would stretch - at Charnock Richard, and then again near Penrith. The 1st stop at Stafford was earlier than I had planned and a 3 stop strategy seemed inevitable. As the miles rolled on, slipstreaming another big rig, I realised my economy was around 57kWh/100miles - much better than I had hoped. A quick calculation and look at WhatsApp and ABRP, revealed the E.ON chargers at Preston East - an ultra rapid, and in reach of our destination in one go if we got a good charge.

11:35 16% 164 miles
We pulled in again to the Starbucks at Preston East. A big wide space, right next to the 2 chargers was sitting waiting to take the caravan. Quick unhitch and onto charge. Once again, we took turns to use the facilities, had a coffee, and decided to eat a bit of early lunch. A couple of other EVs came and went, with the usual chatter (Is that a citroen - no, its a Polestar; What's it like towing the caravan - great; is it fast - very.) 48 mins ticked by and we hit the 90% needed to get all the way to Keswick. In the time it took me to get out and ready to unplug we hit 92.

IMG_6990X.JPG

12:31 92%
The E.ON charger had been fast, 63kWh pulled in in 56 mins, still not as fast as the car can charge, but good. On the road one final time. We had a hard time finding a lorry to follow after ours inconsiderately left the M6 toward Blackpool, but did get onto one on the way up Shap. Economy suffered a bit, but not too badly, and I had built in a reserve. We left the M6 at Penrith, and headed down the A66. Back on the single lane section, it was much harder to keep the speed below 50. With the car set up to coast when my foot was off the accelerator, it would roll very easily over the speed limit on the down hill sections. Much attention needed.

14:30 11% 257 miles
We finally pulled into Borrowdale at about 2:30pm, having covered over 90 miles on the last leg, with 11% remaining. I paid for the pitch and paid for one nights EV charging from the post (£8). The wardens confirmed that we were the first full EV towing to use the site that they were aware of. We got set up and plugged the car in, with the car constrained to 8A to leave some headroom for the van appliances. By next morning we were back up to 55% and ready to head out.

Return Journey.

30/10/2021
8:40am 100% 7c Very wet 0miles
Again - we charged the car overnight on the Club site from the van, and preconditioned. The weather was poor, and had been for the last few days with the lakes making the national news due to rainfall. The lakes were high, rivers had burst, and the car had coped well.

We towed off the site, through Grange and gingerly headed back up toward Keswick, knowing there was at least one flooded section to drive through. Needn't have worried as the Polestar never missed a beat.
Heading up the A66 was miserable it was cold and wet and uphill all the way to Penrith. The target economy of 67 kWk/100m was nowhere to be seen with more like 85 showing. I told myself "its all up hill here, and Shap is downhill" and kept going. We joined the M6, and it was empty. Usually great for a holiday, but not if you want to follow a lorry. After a few mins we spotted on in the distance ahead and I eased the car up to 60 to catch it. We ducked into its stream and followed it to Preston. I shouldn't have worried as I was right; as soon as we were on the motorway, heading down hill and with a windbreaker lorry, the economy climbed and we were back below the target 67 by Kendal. Whilst we could have gone further on the battery charge remaining, we opted for the same stop as we had on the way up, as the driver and one passenger really needed to. Making the diversion into Preston East, we popped into exactly the same spot and charger as on the way up.

10:40am 17% 93 Miles
The sun came out, as we parked the caravan, this time with 4 of us. Coffee and hot chocolate, and a rapid charge. Target was 85%, but we hit 87% in 48 mins, loading in 60kWh. This time we had a two stop strategy in mind and I was aiming for Hilton Park services north of Birmingham.

11:30 87%
Back on the road, and the weather continued to improve. Following lorries all the way down, we got to Hilton Park services with no issues.

1:24pm 18% 187 miles
At Hilton park, the Caravan bays are separated from the main carpark by a low wall. We pulled into the caravan area and un-hitched. I then drove round to the charger and got started.
We manually turned the van round through 180, got a steady down and set up for loo stops and lunch. For whatever reason the new gridserve charger was on a go slow, delivering 51kWh in an hour. It didn't really matter as we ate lunch in the caravan, and had a coffee after. Our target was 80% and we left with 83% for the final leg home.

2:50pm 21% 260 miles
A stilly mistake as we came to the end of the M6, I got in the wrong lane, and ended up on the A14 east instead of the M1 south. Having chastised myself, we got of at the 1st junction and decided to head direct south through Northampton to home. A slightly longer route over all, but not as long as going back to the M1. We got home around 15 mins later than we would have hoped.

Take aways.
Average consumption
Outbound 57kWh/100miles;
Return leg - 60.6kWh/100m
(usually 34-36kWh/100m Solo)

1) The weather on the way back made a huge difference - wet more than cold impacts the economy.
2) We charged too much for the last section, I built in a good 15% more than I needed to, which was perhaps 15-17 mins of charging.
3) Planning really helps - knowing where you can stop, but not necessarily where you WILL stop. Gives you options.
4) Motorway services are not bad - just make up your own rules as to where you will park, and ask forgiveness rather than permission (not that I needed to).
5) Non-motorway services work really well too.
6) Longer distance caravanning works great in an EV if you are prepared to stop (like me). For those who want to do a 6 hour 300 mile tow in one go, not so much.
7) Would I trade in the extra range for going back to an ICE tow car? Emphatic no for me. The Kia EV6 would be on my list of tow cars though for the ultra rapid (18min 10-80%) charge speed.

ChocolateTrees replied on 01/08/2022 09:12

Posted on 27/06/2022 20:35 by Oneputt

Glastonbury - EV charging £50/hour.  Method of producing electricity, Diesel generatorsurprised

Posted on 01/08/2022 09:12

Well sure, but that was Glastonbury where Human method of fuelling = cheap hot dog, cost £10 a go. And petrol or diesel method of fuelling = none. 

JohnM20 replied on 01/08/2022 10:09

Posted on 01/08/2022 10:09

Just out of curiosity CT, when towing does your caravan fridge operate on 12V as it would with an ICE vehicle? If so, does this make any significant difference to your available mileage?

Tinwheeler replied on 01/08/2022 10:44

Posted on 01/08/2022 10:09 by JohnM20

Just out of curiosity CT, when towing does your caravan fridge operate on 12V as it would with an ICE vehicle? If so, does this make any significant difference to your available mileage?

Posted on 01/08/2022 10:44

I can't comment on towing and fridges but our EV, and I assume others are the same, has a conventional 12v battery which takes its charge from the main EV battery instead of an alternator. The 12v battery powers the ancillaries such as lights but not the heavy draw items like air con.

ChocolateTrees replied on 01/08/2022 10:56

Posted on 01/08/2022 10:09 by JohnM20

Just out of curiosity CT, when towing does your caravan fridge operate on 12V as it would with an ICE vehicle? If so, does this make any significant difference to your available mileage?

Posted on 01/08/2022 10:56

So I believed the answer to be “yes, it does power the fridge”, but after our return tow yesterday, the icebox (that had nothing in it) had defrosted, though the rest of the fridge was still cool. Not sure if that was just the 12v not keeping up with 23C ambient, or not running at all for 7 hours.

Either way, I can’t tell if it makes a difference to range, as we always tow over long distance with the fridge set to 12v. I.e. I have no comparison…

DavidKlyne replied on 01/08/2022 16:35

Posted on 01/08/2022 10:56 by ChocolateTrees

So I believed the answer to be “yes, it does power the fridge”, but after our return tow yesterday, the icebox (that had nothing in it) had defrosted, though the rest of the fridge was still cool. Not sure if that was just the 12v not keeping up with 23C ambient, or not running at all for 7 hours.

Either way, I can’t tell if it makes a difference to range, as we always tow over long distance with the fridge set to 12v. I.e. I have no comparison…

Posted on 01/08/2022 16:35

CT 

Do you know how the wiring of the 13 pin socket is different (if indeed it is) from a conventional ICE vehicle? Obviously the road lights on the caravan take up very little power and won't impact on the battery that much. However in an ICE vehicle the alternator can provide a constant power to the fridge which somehow I imagine just doesn't happen on an EV? Whilst the plug in battery will provide the charge for the 12v battery, does it just do this when the main vehicle battery is being charged or is there a trickle permanent charge. I suppose you would have the check the voltage in the car 12v battery after a long journey towing to see what sort of remaining power you have. Getting a handle of this question would be important for anyone towing in generally hotter temperatures.

David

EmilysDad replied on 01/08/2022 16:57

Posted on 01/08/2022 16:57

AIUI an EV has a 12v lead acid battery that is kept charged from the 400/800volt lithium batteries using electrickery. So the caravan is going to take 12v DC from the EV car just as it would from an ICE powered car.

ChocolateTrees replied on 01/08/2022 18:04

Posted on 01/08/2022 16:57 by EmilysDad

AIUI an EV has a 12v lead acid battery that is kept charged from the 400/800volt lithium batteries using electrickery. So the caravan is going to take 12v DC from the EV car just as it would from an ICE powered car.

Posted on 01/08/2022 18:04

DK and ED. Exactly as ED says, my EV (and all EVs) have a 12v battery that runs the car systems, the traction battery  is for traction and topping up the 12V. How and when that is done is car specific. On mine, the 12v is charged any time the car is charging AND when the car is running. It’s done via a DC-DC module.

As to the wiring of the 13pin socket, it’s identical to that on any other car, just with the question of the fridge switched live, which seems to be a question on more and more ICE cars today too. I would have to look at the wiring diagram and get out with a DVM to prove if it’s wired either way. 

I did find this in the manual, which implies there is a constant 12v feed.

 

IMPORTANT
When the car is switched off, the constant battery voltage to the trailer contact can be switched off automatically so as not to discharge the 12V battery.

davetommo replied on 01/08/2022 18:30

Posted on 01/08/2022 09:12 by ChocolateTrees

Well sure, but that was Glastonbury where Human method of fuelling = cheap hot dog, cost £10 a go. And petrol or diesel method of fuelling = none. 

Posted on 01/08/2022 18:30

The point is the clean electric car was fueled using a dirty diesel generator. That makes sense. 

ChocolateTrees replied on 01/08/2022 19:00

Posted on 01/08/2022 18:30 by davetommo

The point is the clean electric car was fueled using a dirty diesel generator. That makes sense. 

Posted on 01/08/2022 19:00

Ah - yes - that is dumb. Agreed. 

You can try and make things idiot-proof but the world will keep building better idiots.

DavidKlyne replied on 01/08/2022 21:47

Posted on 01/08/2022 18:04 by ChocolateTrees

DK and ED. Exactly as ED says, my EV (and all EVs) have a 12v battery that runs the car systems, the traction battery  is for traction and topping up the 12V. How and when that is done is car specific. On mine, the 12v is charged any time the car is charging AND when the car is running. It’s done via a DC-DC module.

As to the wiring of the 13pin socket, it’s identical to that on any other car, just with the question of the fridge switched live, which seems to be a question on more and more ICE cars today too. I would have to look at the wiring diagram and get out with a DVM to prove if it’s wired either way. 

I did find this in the manual, which implies there is a constant 12v feed.

 

IMPORTANT
When the car is switched off, the constant battery voltage to the trailer contact can be switched off automatically so as not to discharge the 12V battery.

Posted on 01/08/2022 21:47

As I understand it you need pin 10 connected which they sometimes don't even on ICE cars. If that is the case it would explain the situation with your fridge as no power would be getting through? Is there a power indication light on the fridge? 

David

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