I've been looking around for 2 new solar panels for my house. I was looking for something in the over 200W range, like two 235W or something similar. I already have a big 12V Battery, and also some other 12V equipment like inverters, fridge and lighting which I would really like to keep. Now I've realized that pretty much all the big panels are 24V or even higher. What would be the most reasonable solution for this? Of course it makes a lot of sense for them to run a higher voltage as it helps a lot in wire size, but I don't want to get into setting up a whole new system.
I've already heard people talk about mppt controllers like the Tristar MPPT 60A being able to work with higher input voltages and being able to charge 12V batteries. Would there be another solution for my problem, or would a MPPT controller the only way to go? I already tried to understand the specs from the Tristar, but could not completely follow. Do I understand correct that I can have voltages up to 150V to charge a 12V battery but only with a total wattage from the panels of 800W?
My last question would then be: My friend has run his solar panels over 3 charge controllers to the same battery because he has added on to his system over the time. He is very picky with his system, and it has worked well for him that way. So would it theoretically or rather practically be possible for me to go with the Tristar 45A for my two 235W 24V Panels in series (to cut down wire size) charging my 12V battery, and if I need to add on to my system in the future, buy another Tristar 45A and two more 235W 24V Panels charging the same battery with the two setups?
Question over questions. It all seems really simple at times, but then it gets me again . If it would be possible to use individual charging setups like my friend uses that would be really great as I wouldn't have to predetermine the total size of my future system as it might grow . And also it would give me some security in case something brakes on one system I could still keep the other part running while I fix the other one.
I'm really looking forward to your responses! Thank you for your help!