Touchwood
Free Member
- Aug 23, 2011
- 772
- 733
- Funster No
- 17,874
- MH
- Compass Avantgarde 140
- Exp
- 5 years and learning
When I bought my MH there were two habitation batteries fitted, a large 110 Ah in the external locker and a smaller one under the side bench. The smaller one was not connected; the connections are there but not hooked on to the battery terminals. There is also a switch fitted next to the smaller battery and wired in somehow, but it looks to me like an ordinary household light switch. I asked the previous owner what the intended setup was, but he was pretty vague about it, and given that some of his "modifications" have proved a bit iffy I'm planning to ignore what he had in mind.
What I want to achieve seems quite simple to me; I want the option to switch to the smaller battery if the larger one is drained by extended use. This isn't going to happen much, if at all, as we are always on hookup, but it would be nice to have the backup just in case.
As far as I can see all I need is to wire both batteries in, with a simple switch to isolate one and put the other in line, and vice versa. Am I right in this? and what about the switch itself? I feel an ordinary household light switch isn't the right choice! I have searched this forum for advice but the only threads I can find get far too complicated with talk of split charging, relays etc., I'm just a simple mechanical engineer!
What I want to achieve seems quite simple to me; I want the option to switch to the smaller battery if the larger one is drained by extended use. This isn't going to happen much, if at all, as we are always on hookup, but it would be nice to have the backup just in case.
As far as I can see all I need is to wire both batteries in, with a simple switch to isolate one and put the other in line, and vice versa. Am I right in this? and what about the switch itself? I feel an ordinary household light switch isn't the right choice! I have searched this forum for advice but the only threads I can find get far too complicated with talk of split charging, relays etc., I'm just a simple mechanical engineer!