Battery is 100% fine. I can run it for over 4 hours with a 100w load and it still held 12.2 volts.
Just had a week away with the van and the small CTEK 3600 charger (3.6 amps max) No issues at
all. The charger was left switched off most of the time. The charger was also using the solar connection
point which has a 20ft length of cable to that battery. I have a twin battery setup when using panels.
This doesnt affect the issue with the original charger, unrelated.
The charger would get a bit warm with several lights on at the same time, but it didnt take long
for the full battery light to come on after switching the lights off. So even with several lights on
for a few hours its probably pulling about 4 amps in the caravan. During the day nothing will
be drawn from the battery.
Delta, sorry if i confused matters. But i do seem to have had a good tinker.
At home i have the charger connected to a leisure battery. To drain the battery i connect a 240v 60w bulb
through a 600w inverter and measuring the voltage at the battery terminals and the current drawn by the inverter.
Inverter is actually pulling around 100w with the single bulb. Inverter is only my home test setup to drain/put a load
on the battery Not used in the caravan.
I used a watt meter or clamp meter to test the power drawn by the inverter.
The original chargers voltage is tested right at the charger and at the battery terminal also. But i seem to have an issue
with the el.cheapo leads with croc clips. Either my old chargers are showing themselves as putting out 6 and 8 amps but
really only putting out 3 amps or my leads are total crap?
I need to repeat the tests with decent and very short cables. I may have done that before we left but i have forgotten....
So the battery is fine and the caravan is fine. I have a meter that shows the mains voltage and current consumption of
a mains powered item also.