Flat batteries

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https://www.autosleeper-ownersforum.com/f36-asof-welcome-section-new-members-please-introduce-yourself-here

iIt is one of these relays, don't know what it might do though.

https://uk.rs-online.com/web/p/automotive-relays/6900808?cm_mmc=UK-PPC-DS3A-_-google-_-DSA_UK_EN_Relays+%26+Signal+Conditioning_Index-_-Automotive+Relays%7C+Products-_-DYNAMIC+SEARCH+ADS&matchtype=&dsa-1624924276784&cq_src=google_ads&cq_cmp=17298636841&cq_term=&cq_plac=&cq_net=g&cq_plt=gp&gclid=CjwKCAjw04yjBhApEiwAJcvNoaEOCAal5oahWYwNlfikIRbe0cHRG1yDF06QKwiSF_HHvn5MX5oaBBoCwvsQAvD_BwE&gclsrc=aw.ds

Could it be to do with isolation button on the ignition switch, when you press it prior to removal of the key , it isolates the battery from any drain but your central locking then won't work, you need to use key to open door. There should be instructions as to its use in your base vehicle handbook.

Yorkshirelass wrote:

It’s meant to be in the section Paul linked to.  A few words about yourself would be nice and you’ll find a whole load of tips on using the forum in that Welcome Section. It’s well worth reading to understand how the forum operates. 

How long has it been since the batteries were fully charged?  The solar panel should keep both topped up now we are into longer days, but it’s not usually sufficient over the winter months. Is it parked in the open?

IanH wrote:100w solar, outside, will easily keep both batteries full all year round

Doesn't work for me.  Maybe good for 5 or 6 weeks, but in both recent winters I've had to turn on EHU after getting a Sargent alert for low voltages.  We do have trees shading to the East.

If I turn off the EC700 doesn’t that kill the tracker. And what about central locking?

hi  Yorkshirelass
the item you have photoed looks like a "smart charge altenator" sensing relay, i work at an Iveco dealers and the vans have something similar,when plugged in it will only charge when the engine is under less load, when unplugged the charge system should default to full charge i.e. 13.8 - 14.2 volts. if both batteries are going flat then it is likely to be a rather large draw of current you may need an auto sparky, if you have a volt meter or multimeter then you can test your charge rate yourself a healthy altenator will output 13.5 - 15 volts depending on state of charge over 15 v will damage the batteries, less than 13.5 the batteries will start to discharge.How ever 5Years for a battery is not bad, especially with modern vehicle high power consumption and many Altenators charging up to and including 170 amps.
if i am wrong and that is not an " intelligent battery sensor" then it is most likely a split charge relay. which is what allows the leisure battery to be charged from the altenator but then isolates the leisure battery from vehicle battery with the engine off. i hope this makes sense. if not then ask me about which bit i was not clear on.
having fully checked them photos it is defo a split charge relay so must be connected to charge leisure battery, however with the engine off the relay should swich off so as to not discharge main vehicle battery, if you have a multi meter and want info on how to carry out the checks let me know.

I’m pretty sure I haven’t got a smart alternator but I’ve got one of those relays. It also looks part of the original vehicle rather than a split charge relay fitted to the A/S build which is why I also assumed it was for the red isolation button as already mentioned.
Happy to learn otherwise though