Winchcombe battery death

Have you shutdown the EC700 PSU with its black shutdown button (top LH corner - not the power button on the EC700 CP) such that it is in the 'out' position and the EC700 CP is completely dead?  If not, at this time of year the EC700 will discharge the leisure battery more quickly than the solar panel can charge it.

Perhaps the next stage then is to check for stray current leakage if you prefer to investigate yourself before contacting the dealer under warranty.

1.   Turn off the PSU, and everything else you can find that the leisure battery feeds. Cover or isolate the solar panel.

2.   Remove the positive battery terminal, set it to one side, then connect a multimeter on milliamps setting between the positive battery terminal and the positive battery post. Start at high range and work down to the lowest range. Only do this once the battery has been off charge for several hours. If any current is shown to be flowing then either something remains switched on or there is leakage somewhere.

3.   If no current is flowing that might suggest a fault in the battery.

4.   If you suspect a stray current leak then the next stage is to remove each fuse in turn until this indicated leak stops. That may then give you an idea of where the leak is.

Question for somebody: On my van there seemed (to my surprise) to be no connection between the Sargent system and the Truma boiler, which as I recall (and before I changed everything) worked perfectly with the Sargent system off. With everything off I seem to recall that the Inet box LED was still flashing. If the OP has a Truma (or anything else similar) could the drain be in that area?

When my EC700 PSU is shutdown, the only drain on the LB is the communication & tracker unit.  Mine was an EC632 with a non-rechargeable standby battery which drew about 10mA.  I now have an EC660-2 which has a re-chargeable standby battery and I have noticed it draws more current but not sufficiently to flatten the LB in 3 weeks.  The supply to the communication & tracker unit appears to come through The No 2 7.5A Brown fuse on the EC700.  If the supply to the communication & tracker unit is cut, e.g. by disconnecting the LB in-line fuse or the No 2 fuse, the communication & tracker unit can go into sporadic pinging rather than every 6 hours which may increase its consumption but after a couple of days it should settle back to 6 hourly pings.  If you have Sargent's tracker subscription service, cutting the power supply to the communication & tracker unit should result in a phone call from the 24-hour manned tracking station in Bedford if Inhibit Service is not activated on AS Monitor.

I've long since disconnected power to the Truma i-Net box so I can't remember what happens to it when the EC700 PSU is shutdown and I no longer have the APP mode on the Truma CP.  When the EC700 PSU is shutdown, the Truma CP goes dead and it loses its time and power source settings.  When the EC700 is turned back on again, the Truma CP springs to life with an error code until I turn it off or I turn the EC700 CP power button on.  When I want to use the Truma, I have to remember to change the power source setting to the one I want - usually EL2.  I don't bother resetting its clock.

Fixer wrote:Measuring the discharge current when shutdown is the only way to determine if the battery has an internal drain fault.
It doesn’t take much of a discharge to flatten a battery and I would imagine that 23 days isn’t abnormal unless you have some solar to assist with topping up.

Before I fitted a solar regulator that charges both batteries and bypasses the EC700, the LB received no charge when the EC700 was shutdown (and the mains charger was switched off or there was no EHU connection).  Providing the LB was fully charged to start with, it was fine without charge for at least 3 months.  If the OP is finding his Li LB is being discharged after 23 days, there is definitely something wrong.

Unfortunately its very easy to damage a multimeter when measuring current and then it doesn't work properly.  This happened to my first multimeter which is why I prefer to use a clamp meter to measure current but that is unlikely to be sensitive enough to pick up very small currents.  Hopefully the habitation service technician will come up with something.