Wanted to share my experience with the SMA SunnyBoyStorage (SBS) with the LG and BYD battery combo.
For background, not until installation nearly a year back did we discover that despite early marketing literature claims, the LG batteries would not recharge during backup operations. This was because of the DC to DC converter inside the LG that resulted in SBS losing necessary power during transitions between charging and discharging. Me and another wrench pushed SMA hard and they agreed to provide us at no cost a BYD battery which they said would be the solution and to install that is one battery with LG the remaining two. (this was previously a 3xLG system) SMA stated that the BYD and its true 400V internals would provide the continuity for the system to operate as first advertised. The BYD certainly addressed the lights going out during backup ops but the two remaining LG batteries just won't recharge during backup operations. They will discharge and discharge but no recharge from PV power during backup. SMA will not even return emails at this point as I've inquired if there is another setting to get the BYD and LG to co-exist. As we all know the SMA parameters page is not the easiest to interpret and unfortunately there is not documentation to explain the parameters such that we could make meaningful adjustments. I'm guessing the indemnity / no-sue paperwork that SMA insisted I sign before they provided the BYD is their card to cease technical support.beware out there. Whenever somebody says they have a better storage mousetrap I always wonder if the system has truly been put through the paces and has necessary tech support. I got burned by an up and coming storage/inverter system one time so when SMA came along with SBS and ABU I thought I'd have the full force and reputation of SMA to carry me into the future.
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