Optimizing Schneider AC Support
I recently added additional capacity to my battery bank moving it from 200ah to 400ah. My setup consists of a Schneider 4048, ~2.5kw of solar tied to a Schneider 80-600 charge controller and a carbon-AGM based battery bank. My system was built with two key objectives: 1. provide back-up power as we have power outages from time to time and 2. reduce my utility bill utilizing the excess solar to provide a payback for the system. I have been running the system in Enhanced AC Grid Support mode with good results. On the 200ah battery pack, the system would discharge the batteries each night to 60% SOC and then I had a charge block set to wait until 9am each morning to give the solar a chance to charge the batteries and then utilize the solar for AC support once the bulk charge phase was complete (usually 3 hours each morning). Generally, we have the power outages in the late evening so I attempted to ensure that the batteries had at least a 90% SOC around 9PM as they discharged in AC Support. Under this configuration, the system always exited AC support as the batteries hit 60% SOC early each morning. I upgraded the batteries to ensure that under full load support the pack would last at least 6 hours in a power outage as the 200ah pack did not perform quite as well as I expected under this scenario. When I upgraded the batteries to 400ah I started to see that the majority of days the system would invert on AC Support and make it to 9am when the solar came on line. I noticed that the 4048 continued to invert splitting the power between the loads and the batteries for charging where before it would pass the AC through to the loads and use 100% of the solar to charge. It seems to me that I would want to exit AC Support each morning as the best way to maximize my two objectives using the solar to charge the batteries as much and fast as possible and then using the excess to support the loads to reduce my power bill, but I do not see a way to do this. I am still a relitative novice in the solar arena and looking for advice on how best to configure the 4048 and 80-600 to best perform against my objectives with the new batteries. Any and all feedback would be most appreciated. Thanks, Dan..
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