Yep, here comes a new-to-be owner with a post on something that I'm sure has been covered many times. I did search around and this post was wonderful in explaining, in fact I think I've seen this text somewhere before:https://rinkerboats.vanillaforums.com/discussion/comment/28632#Comment_28632
I think I have this figured out, just checking if I am correct or am I misunderstanding anything?
The Rinker FV270 has an on board charger with two circuits that will charge both starting and house batteries simultaneously when hooked to shore power, that is to say, they charge independently, not in parrallel so that the charge controller doesn't read the "stronger" battery and shuts down before both fully charged, correct?
The battery switch dictates which battery is being utilized for starting, providing power to circuits and also being charged by the alternator, for example at battery switch position 1, battery 1 is on line, battery 2 is totally isolated and vice versa. In a situation where both batteries are low, the "both" position can be used to start by putting both bateries into a parallel circuit, correct?
Here's where I start getting a little hazy. I know that it's bad to switch between batteries with engine running and alternator charging, bad for batteries and alternator, etc. So in an example where you use "Both" to start I would presume that both batteries will then be charging by the alternator. But in parallel, the charging circuit will read the "stronger" battery and shut down once at capacity, leaving the other battery at less than full charge. Is the proper method then to shut down, switch to the battery that has been discharged, restart and let it then fully charge?
And the second part of this is, let's say I've run the house battery down, no problem, I fire up on the starting battery but then how do I switch over to the house battery while under power so that it will charge as the engine runs?
Or is the answer as per the post above "The arrangement of the contacts of the typical OFF-1-2-BOTH permits the operation of the switch in the range of 1-2-BOTH without ever disconnecting the batteries from the load or the outboard charging circuit. This is important, as it is possible to cause damage to the charging circuit if the battery is disconnected while the engine is running. By choosing the path of rotation of the switch, it is possible to change from 1 to 2 without moving through the OFF position."
This doesn't make sense to me. Whether or not you move through the OFF position, simply by switching from 1 to 2 or both while under charge, does this not cause an issue? Or is there something I'm not getting?
Finally, for overnighters on the hook, I may want to install a second house battery in parallel for more capacity. Any issues with the stock on-board charger, or alternator/charging circuit I should take into account?