I'm needing to replace the master SI from a 2006 installation knowing that it's only a matter of time until the slave gives up the ghost. I want to recommend to the elderly owner that she replace both units at the same time since I already replaced the original 5 SBs with two new SBs less than a year ago and the 640Ah battery two years ago.

Being several years retired now I have not kept up with the advances in GT-BB controllers and so need to hear what the options for a split phase 240v replacement this established body of specialists would recommend to keep this system going another decade or more.

Thanks
Jim Duncan
North Texas Renewable Energy
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