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we leave our battery in the caravan all through the winter, but we are lucky enough to also be able to leave the van connected to a EHU point so that the battery can recharge as required. we also leave a 12v light on so that theres some constant usage from the battery, plus we leave cat litter trays of common cooking salt down to act as a dessicant and remove any moisture from the air.
Now for the controversal bit, throughout last years bad winter, we also left a cheap fan heater plugged in set to 'frost gaurd' but although it worked well, and kept the main part of the caravan dry, it also caused some condensation to form in a corner at the rear of the caravan where the water and ice sheets were thickest on the outside and took the longest to drain, due to the fact that the cambre of the pitch it was standing on made that the easiest means of escape for all water coming off the caravans roof. The result was a watermark about an inch in diameter and about 12ins long down the join where the rear of the caravan meets the along the side. This would have been the point where the water ran most on the outside of the caravan and where the fan heater would have had the tempreture up quite well at that point as it was left standing on an old tea tray on the rear dinette table.
When we first spotted this we though oh no! not the dreaded damp that has hit us, but after a trip to our dealer, and a test around the entire van with his damp meter, he confirmed that this was indeed due to the severity of the extremely cold temps outside (upto -18c some nights and with thick sheets of icicles stuck to that corner of the caravan for about a month during the big freeze) hitting the warmth of the wallboard within the caravan, and at a point where there were probably some small gaps within the insultaion due to the corner join which allowed the condensation to form.
No further action was taken or needed, other than to switch off the fan heater, and we have kept an eye on the moisture readings for that corner throughout summer, and we now have a normal reading of around 12%, the annoying water mark still remains, but it has taught us to level up the caravan better to avoid a deluge of drainage off that one corner, when putting it to bed for winter, and we have now invested in a dehumidifyer to give it an extra boost during severe cold weather, and will leave the fan heater firmly switched off during this winters storage to avoid risking this problem from occuring again.
Julia
------------- Just love to be out amoungst Nature and Wildlife
Celebrating 37 years of Caravanning in 2019, Recently Considered Retiring, but Totally Addicted for Life!
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