Hi Craig, and unless that device has a selectable choice of either being a battery charger or a power supply, then it is a power supply and should NOT be used as a battery charger.
Next, if it is nothing more than a power supply, it needs to be replaced with a genuine multi stage battery charger.
As for the size of the charger, this will depend on your type of usage.
Are you planning on doing a lot of free camping and expecting to use a generator/ battery charger setup to charge batteries while free camping, then you need the largest battery charger that will meet your needs, to keep your generator run time to a minimum.
This is the ONLY time you need to look at a large type battery charger.
If you have no intentions of using a generator to recharge batteries, then you can go for a much smaller charger and your batteries will be far better looked after.
Battery chargers can be used as power supplies while charging and maintaining your batteries.
At present it sounds like you have only one house battery, and it would be future proofing your system to look at the possibility of you needing/adding an additional battery or two.
So with some basics, look at your total likely power needs from the battery for a 24 hour period. This power requirement will vary from one person’s use to another, so no set figure is going to be accurate.
Then divide this total by 12, and this will give you the minimum capacity size for a battery charger to be able to replace this energy during an overnight stay at a caravan park.
Then you need to workout how much current draw you battery will place on this charger to recharge the battery from a low state, in the same time period.
The two figures will give you a rough worst case requirement for the size of battery charger you will need.
As to using a DC/DC device as a solar regulator, I straggly recommend against this type of use because most DC/DC devices are very inefficient at solar regulation and actually use heaps of your limited solar power, just to keep their own electronics powered.
You are far better off getting a good quality dedicated solar regulator and connecting it straight to the batteries.
You can also disregard the Wialki power supply and just connect your battery charger to the same connections on your house battery, and you can connect your input from your alternator to the same connections.
Note, this is just the basics, but it should give you something to work with while planning your upgrade.
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