I'm setting up a solar system with two 12 V 280 Ah batteries connected in series. I'm looking for advice on selecting the appropriate switch for these batteries. Should I go for a 300 A or a 600 A switch?
2 Answers
The size of the batteries isn’t the main factor here; it's all about the current demands. Since you've got 140 A from the MPPT, it's safer to stay within that range, so a 300 A switch would be appropriate. A 600 A might be over-engineering unless you plan on adding more power in the future.
To determine the right switch, you'll want to consider the current you'll be drawing. The voltage rating is important, but the current rating is crucial. You mentioned that your MPPT controller can handle up to 140 A and your inverter is rated for 4000 W at 24 V. Based on that, I would recommend opting for the 300 A switch, as it's sufficient for your needs without being overkill. Just make sure the switch is rated for the right voltage as well!
Yeah, that sounds right! The 300 A should work just fine for your setup.
Good point! Keeping things safe and efficient is important.