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Still having pressure problems



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spruce
20 hours ago, Ian Sheppard said:

Hi Tuffers The V11C does work differently to some VSR  as it has a delay that prevents an immediate charger drop out as the alternator output drops during driving And where this alternator voltage drop does happen the charger does kick back in again as the alternator charge voltage then recovered
 

In terms of the V11C we did some testing late last summer using a

A V11 Charger on a Peugeot Euro 6 Van
Model: Peugeot Expert
Engine: 1.6 TDI with air con
Alternator: https://www.mister-auto.co.uk/alternator/valeo-440676_g4_a021440676.html

 

Information led us to believe that on Euro6 vans the voltage drops in normal driving to below 12.5V, this was not the case. The lowest voltage seen is this van was 12.9V ( this was being measured at the leisure battery)

What we did see was that the alternator dropped out (voltage and charge current dropped to zero) under heavier acceleration. Hence to save fuel when accelerating the alternator was being turned off. In effect the Euro6 operation (on this van at least) is the opposite from what we had been told. The voltage does not spike on braking but drops on acceleration with the V11C pausing charging. Then as the heavier acceleration eases and settles to normal driving speeds the alternator comes back in and the V11 continues to charge the leisure battery.

 

We found

1. Before Running Van
Van Battery: 12.91V
Leisure Battery: 12.31V

2. Engine Running (Stationary)
Initial values:
Van Battery: 13.31V
Leisure Battery: 13.20V
Charge current: +11A dropping to 8A after 2 minutes.

3. Engine Stopped
Van Battery: 12.76V
Leisure Battery: 12.70V

 

4. Driving
Van Battery: 13.3-13.4V
Lowest voltage seen: 12.9V
Open load voltage: 14.10V
Leisure Battery: 13.3-13.4V
Charge current: 7.5-8A

 

 

I found these test figures very interesting @Ian Sheppard. Thanks. Your leisure battery was quite discharged at 12.3v and for it to only accept an initial charge of 11amps dripping to 8 amps is what I find with our system. 

After 40 minutes back and forward to work and 20 minutes between houses the leisure battery will only get around 8 amps back in a day. If we use 30 amps with 2 pumps then it won't take long before that leisure battery is drained. It amazes me how some say they have never needed to bench or auxiliary charge their leisure batteries.

It's also interesting to see that the van you tested only cuts the alternator when the engine is under load. That's a new one.

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Ian Sheppard

Hi Spruce. The figures applied to the Pegeout, I would agree different manufacturers will take different routes to comply with Euro6 my Seat uses Adblue + start/stop.

What we found interesting was that Rgen braking on the test vehicle at least did not cause a big spike, Volts and amps stayed as were. The Alternator switching off under heavy acceleration was also different to what we had anticipated. The Van was a hire vehicle as such probably does lots of short journeys most of the time and helps explain the low Vehicle battery state with engine off.

 

The delay pause built into the V11C proved very useful as the relay remained closed when the alternator briefly dropped out, with charging resuming as it came back in confirming for us that it would work with Euro6. Some of the intelligent VSR may also have a similar feature as manufacturers are going to have to adapt to Euro6 and beyond. With some vehicles the answer may be Battery to Battery  and I would always suggest with a new vehicle check that adding an auxiliary split relay does not effect the warranty. Plus while split relay charging is very useful the Leisure battery will still benefit from a mains bench charge from time to time

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Tuffers

I have to add AdBlue to my van. The engine doesn't stop when I'm at traffic lights, the green light flashes, but my engine hasn't switched off at traffic lights for ages now.

I have to add AdBlue to my van. The engine doesn't stop when I'm at traffic lights, the green light flashes, but my engine hasn't switched off at traffic lights for ages now.

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steve garwood
1 hour ago, Tuffers said:

I have to add AdBlue to my van. The engine doesn't stop when I'm at traffic lights, the green light flashes, but my engine hasn't switched off at traffic lights for ages now.

I have to add AdBlue to my van. The engine doesn't stop when I'm at traffic lights, the green light flashes, but my engine hasn't switched off at traffic lights for ages now.

Sorry, could you repeat that please 

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Tuffers
1 hour ago, Tuffers said:

I have to add AdBlue to my van. The engine doesn't stop when I'm at traffic lights, the green light flashes, but my engine hasn't switched off at traffic lights for ages now.

I have to add AdBlue to my van. The engine doesn't stop when I'm at traffic lights, the green light flashes, but my engine hasn't switched off at traffic lights for ages now.

 

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