Iím not sure if this is the best place to post this question so please accept my apology if itís not.
Iím designing a grid tied dual XW6048 system. The manual says a minimum of a 100 AH battery bank for one inverter which I know is ridiculously low. Since the system is grid tied I want to use the smallest feasible battery bank for several reasons. The obvious one is initial cost. The second reason is efficiency as in daily delivered AC KWHís. As the battery gets larger the higher the charge/discharge and self-discharge losses get, especially as the bank ages. We only need a max of one day of autonomy since we are grid tied and have a generator.
Iíve never had good luck with sealed batteries. We can locally source Trojan L-16H-ACís with a 435AH capacity @ C20 rating. We are planning to use just one string unless you folks can help me understand that is going to be problem. I donít like multiple strings of batteries and a single string of the something like Surrette or HUP is totally overkill for a grid tied system plus cost 4xís more.
The main reason we need the dual XW6048 is because of the 2HP well pump that is grossly oversized but suggestions to replace it with a soft start models are falling on deaf ears. Iíll look over the load calcs again but it might make more sense to go with a dual XW4548 instead. I see that CEC rates it with slightly higher efficiency as well.
Iíve zeroed in on an array of 7.5 to 8.5 kW. Thatís all the roof we have so itís unlikely the array will ever get larger. I like what I see on these MPPT600-80ís charge controllers but have some questions about them which Iíll ask in a separate post.
Any suggestions or requests for clarity are more than welcome.
Go easy on me. Itís my first post.