peteK
Well-Known Member
The cheap one I bought gives priority to battery 1 and you can set it in 10% stages so if you set it at 70% it will charge battery 1 until its 70% charged and then start charging battery 2.
Todays electronics - there are many solutions to user settable limits on chargers and controllers.
I have a bag full of small units designed to auto control charger to battery ..... basically the charger is wired to the small unit, the battery is connected ... unit detects battery level ... user sets the low and high limits of the unit. The unit then switches the charger on / off via chargers mains power input.
12V Battery Automatic Charger Charging Switch Controller Module Protection Board | eBay
https://i.ebayimg.com/t/12V-Automat.../00/s/NzMxWDczMg==/z/-CoAAOSwbYZXak-Y/$_3.JPG
Seriously ? For controlling the mains charger on a boat ?
What sort of charger would you envisage to be using this with ?
I don't use now - but they were destined for a 'project' ... myself and an experienced electrician pal from Fishing Boat yard had ideas to create charge control systems as Latvia is poorly served locally. Literally everything needs to be imported. The test setup we created worked excellently, but we decided not to proceed further as various items then started appearing online.
The units are still a viable item to control a charger - it would be expected that charger be of the lower rate 'dumb variety' of up to 10A. The idea to use this as a maintenance setup allied to a typical portable car charger.
As said - there are other versions that do not act by controlling the mains power to charger ... so they could in fact work with solar / wind.
The units are actually very good and far better than you seem to imply. With large range adjustment to cater for literally any common battery type.
You may scoff ... dismiss all you want - but some people appreciate or look for ways to create solutions. If my linking to items helps - then I'm happy. If people don't use - fine also. There are those who just want to buy the answer ... others who enjoy creating their own solution.
If it wasn't for such people in the past - many of the items over counter would never have appeared ......
thanks All for these interesting replies. Plenty to think about here. Given that they are small panels I might stick with the Marlec HRDX controller which is about 15 years old but still seems fine. It has two inputs and outputs for two battery banks so works pretty well for my needs. Its impossible to know how long a piece of kit like this will last though....
There is no reason to believe the 15yo controller is near end of life. Generally electronics die of there own reasons just as likely in first few weeks as after many years. This of course must exclude corrosion which might cause a finite life. ol'willthanks All for these interesting replies. Plenty to think about here. Given that they are small panels I might stick with the Marlec HRDX controller which is about 15 years old but still seems fine. It has two inputs and outputs for two battery banks so works pretty well for my needs. Its impossible to know how long a piece of kit like this will last though....