Hello All,
I’m not sure if this is the best place to post this question so please accept my apology if it’s not.

I’m 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 KWH’s. 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.

I’ve never had good luck with sealed batteries. We can locally source Trojan L-16H-AC’s 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 don’t 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 4x’s 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. I’ll 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.

I’ve zeroed in on an array of 7.5 to 8.5 kW. That’s all the roof we have so it’s unlikely the array will ever get larger. I like what I see on these MPPT600-80’s charge controllers but have some questions about them which I’ll ask in a separate post.

Any suggestions or requests for clarity are more than welcome.
Go easy on me. It’s my first post.
Thanks,T