From the latest posts....
My Engel is a grey (current colour) although 23 yrs old. It has 2 input sockets for power, with a slide cover such that with the 12VDC cable inserted it covers the 240VAC socket. To convert to 240VAC requires me to pull the 12VDC plug out, slide the cover and insert a separate 240VAC cable, which the cover then slides across the 12VDC input. In other words you can't connect 12VDC & 240VAC at the same time. This requires no switching as the Engel's internal wiring knows which source is in use.
Re batteries - There is nothing wrong with using 4 x 60AH batteries wired in parallel to give 240AH total, however.....If batteries are connected in together to do this, they should be;
- Of the same chemistry[/*]
- Of the same Brand[/*]
- Of the same age[/*]
- Of the same capacity, and[/*]
- Wiring between them heavy enough for the total capacity of the system, not the individual battery capacity, but more so the expected maximum current draw or recharge amperage whichever is greater.[/*]
If one of a bank of batteries deteriorates, it will damage the others, if unnoticed.
I have a 120AH in my caravan, I'm considering doubling the capacity. There are 2 ways to do this, buy another 120AH and parallel connect or, buy a 240AH battery and replace it. The better option is the 240AH, given that my van battery and a new 120AH will not be of the same age. The other question I need to answer is the size of a 240AH compared to an added 120AH.
Obviously if the batteries are portable, moving 4 smaller batteries will be easier than 1 BIG battery.