There are similar systems available to this one. I think you mean that
the inverter is UL 1741, but the system is not grid-interactive.
Stand-alone inverters can be listed to 1741 as well.
IIRC, when I saw them at SPI 2012 they were doing everything in DC. They
may have switched to AC so they could use romex rather than EMT?
On 2013/10/3 16:13, Jason Szumlanski wrote:
Anyone else getting inundated with SunBandit Hybrid Solar Water Heating
System marketing emails? Any first impressions? Here are my initial
thoughts:
Pros - provides hot water in utility outages, no interconnection
hassles, possibly easier permitting hurdles, eliminates moving parts in
active SDHW systems
Cons - no grid-tie, any excess energy produced is wasted, AHJs won't
know how to categorize equipment for permitting and may charge for solar
water heating and PV permits and inspections
I haven't dug too deep, but one strange thing I think I saw on a spec
sheet was that the "micro-AC Grid" (aka microinverter) is UL 1703. If
that is the case, how does the PV continue to provide water heating in a
utility outage? What I really don't understand is why there is a need
for a microinverter at all? Why not just use a DC element? I guess a
microinverter, despite minor efficiency losses, is cheaper than a load
controller.
Jason Szumlanski
Fafco Solar
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