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  1. daklein

    SMA SunnyIsland 6048 lead acid SOC estimation

    Wow, that was a big drop in the SOC estimation, from about 75 down to 20. Dropped into the battery protection mode and connected to the grid even though it was still on-peak hours. I just happened to notice looking at the monitoring. If the grid had not been available, it would have shut off...
  2. daklein

    Heat pump powered via automatic transfer switch

    I would use one of these style switches: https://www.amazon.com/gp/product/B07RSWY129 Has anyone powered a heat pump via an automatic transfer switch? The ATS is a fast switching ~50ms type, so less than 3 cycles. It should be fine to switch even when the HP is running, but most likely the HP...
  3. daklein

    Recommend a GT PV inverter? ~24v ~30-40a input, 240vAC output

    Can anyone recommend a modestly small grid-tie PV inverter that is good for lower voltage ~24v PV strings? I know the SUN GTIL type, but anything similar that's more UL listed type of product? Any large microinverters? (but I don't know what the original application would be for 2-3 panels...
  4. daklein

    Sunny Island 6048US - W351 (W352) - Disconnect from external source due to external short circuit

    Anyone encountered this error, intermittently? W351 (W352) - Disconnect from external source due to external short circuit. The slave disconnected from the grid, and tried to reconnect repeatedly. I'm using silent mode when connected to grid, off-peak based on SOC thresholds about...
  5. daklein

    SMA SunnyIsland + Enphase microinverters + A/C compressor load = enough electrical noise to interfere with microinverters?

    I have a system mostly as shown in the attached diagram. Recently have added a separate ~13kwh 14s lithium battery bank which the Midnite CC charges, and 10 microinverters enabled by a relay board discharge the lithium battery mostly at night, or any time there are more loads like the AC load...
  6. daklein

    DIY timer / controllable transfer switch contactor box.

    I recently finished a DIY transfer switch box to move my grid tied array between the grid and the island/off-grid panels. It is a 4.7kw 'grid-tied' system with microinverters which goes through a generation meter. The motivation is to use the grid-tie system energy in the house directly where...
  7. daklein

    SMA Sunny Island grid charging settings questions

    Hello, for background, I have a system made from a DC Solar trailer, and some extras: A pair of SMA SI6048US Sunny Islands, with 1080Ah lead in a box & vented, 1kw PV on a Midnite Classic 250 straight to battery, and about 3.5kw AC coupled with Enphase m210s behind the SI's AC1...
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