I have 2 Trojan 12 225 ah on a 12 volt system, they have been connected to the charge controller and inverter for about a 11 ½ months. Because is a backup system they have been rarely use (just for the occasional blackout), maybe a 8 hours and never discharge less than 12.9 volt. Because the hurricane season I want to add 2 more batteries of the same brand and model.
The question is if it is safe to do so and if I have to charge all 4 (the one years and the new ones to the same voltage) or there’s a procedure to be done.
The question is if it is safe to do so and if I have to charge all 4 (the one years and the new ones to the same voltage) or there’s a procedure to be done.