Jeff, It is somewhat possible to use all ten inverters, but with some severe limitations. The best solution depends upon exactly what you've got, and what your client needs.
The joy begins with the fundamental limitation of G series inverters to Classic Stack only. They parallel on the grid side, but normally need totally different output panels, battery banks and PV input. You'd think you could break up your 10 inverters into 5 "systems" (each on its own Hub4 and RTS) sharing a common battery, feeding 5 separate protected loads panels. But unfortunately no, it's not quite that easy. The issue is, at some point a month or so down the line the grid power drops, and the system begins to draw down the batteries. After grid power resumes, all 5 "systems" begin to charge the shared battery bank. No problem, eh? What's to worry? Well, eventually one of those inverter pair "systems" will see the battery as being full, and switch back to GT mode. It tries to sell down the batteries. However, the other handful of systems think the battery isn't quite full, and they ramp their charging back up. Eventually the client wonders why his meter no longer turns backwards, and calls you back out. IF you have 6kW or less of renewable input, I'd suggest leave the system wired as it is (two G series selling back, 8 standard FX in Outback Stack to a separate protected big loadcenter) but disable AC charging capability on the 8 stack. This will leave you with ~6kW of backup charging capability. You have to leave the AC charging to the G inverters, as they need to be the ones who determine when it's ok to stop charging and sell back. The output of the G series inverters will need to be run to a separate protected load panel, and all charge controllers need to share the same Hub with the G's. If you have more than 6kW of renewables, then split off additional inverters or pairs of inverters with their own Hub. Each would then need its own separate protected load panel, and would of course need to be swapped out for G series. However, and this is the fun part, at this point you need to disable ALL AC charging capability. All recovery after a power outage will have to come from renewables. Which might or might not be a good thing. Good luck Phil Undercuffler Director, Battery-based and Off-grid Distribution Sales Group Conergy Our World Is Full of Energy 1730 Camino Carlos Rey Suite 103 Santa Fe, NM 87507 p.undercuff...@conergy.us Direct | 505.216.3841 Toll Free | 888.396.6611 x4841 Fax | 505.473.3830 www.conergy.us --original message: I have not seen the system yet, but was told he has ten (10) Outback inverters, 2 configured for sell back and 8 not....Was told they could be factory re-configured to all sell back, but can only stack two inverters in sell mode....If true, why can't you just parallel multiple stacks of dual inverters and just feed each pair to their own circuit breaker in the main panel? Jeff Yago
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