Funster No : 4952
Join Date: Nov 2008
About Me: Marketing & Communication Consultant
Interests: Photography, Walking, Bird watching
MH Type: A Class
MH Model: Hymer B630 Star-Line
Years Motorhoming: Since 2007
Thanked 605 Times in 515 Posts
This answer (to a different post) may be of some help.
"We had to have our batteries replaced in early December - one had failed. So we replaced 2 x 80 Ah Gels with 2 x 110 Ah Elecsol - wired in parallel. We have not tested to exhaustion, but as an example, at the beginning of Feb we were able to go for 3 nights in sub-zero conditions with snow on Sunday afternoon/night, without re-charging. We ran the usual lights / cooker extractor / water pump etc and watched DVDs on a laptop plus powered speakers for about 3 hours each night via a 150W inverter. (I guess that is about the same as running a sat TV system.) And the Truma C6002 was on continuously from arrival to departure, although turned down to 2 overnight and 1 during the day whilst we were out walking. There was still some power left in the batteries after this."
To answer your specific question, how long it takes to re-charge your battery(ies) on hook-up depends on the output from your charger and the amount of AmpHours of battery to be re-charged. So, in my case, max 220 Ah of capacity divided by 18 Amp max charging current = 12.2 hours. But as already pointed out:
1. don't discharge the batteries completely.
2. there will be some inefficiency in re-charging, therefore extending the time required.
As a fair 'rule of thumb' allow 24 hours to fully recharge your batteries (assuming there is a decent charger fitted in the MH