On 3/21/21 1:32 PM, (-Phil-) via EV wrote:
Most grid tie inverters nowadays are transformerless, so you absolutely cannot reference the DC input to ground in any way. It will end in smoke and/or tears!
I've taught myself that lesson slowly, tediously, painfully, and expensively. I'm using the very cheap used panels from Santan near Phoenix and I'm unwilling to go to more expensive panels. The Santan panels are trouble free with microinverters and transformer string inverters. No exceptions. They are very troublesome with transformerless string inverters. I've taken to doing insulation testing to try to select the panels that might work with transformerless inverteres. I'd be pleased to find a transformerless inverter that has settable "isolation fault" thresholds. Transformerless inverters were spawned in hell. IMHO. I'm constantly seeking a good supply of transformer inverters. With microinverters, I put PV up for less than $.40/watt. If I find good transformer string inverters, it can go down around $.20/watt.
You are doing Sprinter conversions? Can you point me toward typical specs? How do you find your customers? Are you doing that in McAllen?
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