[Spruce]

I’ve sent emails to various auto electricians over last couple of months , and only had about one reply to at least 6 emails sent. I’m going to try the next county see if any one else will do the job. County next door is only about 10 miles away, Tyneside have received about 6  to different companies and Ive only had about 1 reply .

I would still buy one of those cigarette plug voltage testers and watch what voltage the alternator charges at when you are driving around.

If the alternator charges at between 13.9 and 14.2v constantly, then you can use that cheaper split charge relay kit you linked to initially.

If the charge voltage jumps to any voltage higher that 14.6v, then you have to go to one of those b2b chargers.

Fitters who fit towbars and caravan service workshops are all people you could contact to fit a split charge relay.
Didn't someone say that there is a guy in the north east who fits wfp tanks. If so he should be able to help you.

[RPCCS]

Finally I got in touch with an auto electrician, he rang me this morning and is coming on Tuesday to give me a price to do the job on a different day.

[M Clean]

I have a 2015 vauxhall with Start/Stop. It has what I call Smart Alternator.
I believe this alternator set up is key to my having this work for me.
I have put the highest cranking ampage battery i could fit under my bonnet.
I have recently turned off in the settings of the digital varistream to cut off if the voltage drops.
I have been using my van battery to power my pump for many years.

I chose the high ampage car battery because it is configured for use in high drain electrics and my alternator is designed to charge a flat or low charge battery quickly.

I have a 100ah leisure battery charged by a Stirling BB1230, (b2b charger) to power my hose reel. It also powers my LED lighting.

I have a 12V Spur from this battery that I have only ever used once 2 weeks ago.
I had to switch to this battery because I had done very little travelling between jobs, working very long days with the flow rate up high.
The digital controller cut out because my van battery had dropped to 11.5 (it's cut off point).
I got power from the leisure Spur.
This lasted 3 days before the reel started going slowly, so I swapped it back to you van battery.
It was at this point I found out you can cancel the battery monitor on the controller, which I did.
So now I expect to never have a problem ever again where I can't get power to my pump from somewhere.