No, I would not use a Sol-Ark unless it was redundant, as in two paralleled for AC output. I agree with you.
That's the other advantage of AC Coupling in a dual Sol-Ark configuration. If done right the "extra" AC coupled PV can be usable in the event of a single inverter failure (to an extent). But I don't have enough experience with it to know for sure if this is a viable option. Jason On Thu, Jan 21, 2021, 5:34 PM Dave Angelini Offgrid Solar < [email protected]> wrote: > Hi Jason, > > The downside of an all-in one, that may be acceptable for grid, is in a > failure an all-in-one becomes unusable unless there is a spare. Even with > one it is often a bigger job to deal with. This was my feedback to > Schneider when they were looking into this 5 years back. I know they made > the right decision for offgrid.[image: Wink] > > > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail [email protected] <[email protected]> > text 209 813 0060* > > On Thu, 21 Jan 2021 16:05:44 -0500, Jason Szumlanski < > [email protected]> wrote: > > > It's already built - 6 years old - I didn't do it. The new property owner > just purchased a very expensive battery bank and wants to protect it, > understandably, because she had problems with her generator not starting as > expected when not at the property. It was suggested by the original > installer to install a load shedding contactor as the manual suggests > (albeit in an opaque manner). I just can't seem to wrap my head around why > this is a good idea. The integrated battery protection mode should handle > this function. A contactor (or series of relays and a contactor) carries > too much risk of failure that could result in another problem for the owner > altogether. I understand protecting the battery, but the cure can't be > worse than the disease. I'm looking for a balanced approach, which I > believe is to just implement the BPM unless I'm missing some deficiency in > that strategy. > > The system worked great in an AC coupled configuration until the generator > started becoming unreliable. In Florida I like AC coupling in a scenario > like this where the most challenging load is in the summer, essentially > concurrent with peak sunlight (air conditioning). However, I have been > looking at trying out a Sol-Ark as soon as the opportunity arises with a > combination of DC and AC coupling. With no separate charge controller > involved, it becomes much less complicated and you get the best of both > worlds in theory. > > Jason > > > > > On Thu, Jan 21, 2021 at 3:36 PM Tump <[email protected]> wrote: > >> IF this system has yet to be built I would STRONGLY suggest that AC >> coupling is NOT considered. IF it is them i would consider HV CC DC >> coupling. >> T >> >> On Jan 21, 2021, at 3:15 PM, Jason Szumlanski < >> [email protected]> wrote: >> >> >> Hi Mac, >> >> Yes, I considered using a pilot relay - it makes sense to run it on 120V >> because relays are readily available. I had the exact same concern - more >> to fail. >> >> In this scenario, the inverter/battery room is remote from the house so >> there is only one load I can switch easily with a contactor, and that's the >> whole house load. Otherwise, I would definitely consider switching >> non-critical loads in a low battery situation. >> >> It just seems prudent enough to use the integrated Battery >> Preservation Mode (BPM), even in this AC coupled system. I considered a >> small DC array to charge the batteries in a heavily depleted situation, but >> it's a 60kWh battery so I would need a pretty substantial "backup" array I >> think. It does not seem like a reasonable solution. I would expect BPM to >> do it's job and keep the batteries from reaching a state that they are not >> recovered quite easily. >> >> Jason >> >> >> On Thu, Jan 21, 2021 at 2:37 PM Mac Lewis <[email protected]> wrote: >> >>> Hi Jason, >>> >>> The only reason to load shed, without using the internal preservation >>> mode is if you have certain loads you'd like to keep on longer than other >>> loads that you shed. The various preservation modes can be complex, >>> especially if you are AC coupled, so you really have to think through your >>> strategy. >>> >>> You can always use a pilot relay, with a coil rating that suits your >>> needs, and then feed the 100A contactor with that. Unfortunately, its just >>> one more piece to fail... >>> >>> On Thu, Jan 21, 2021 at 12:13 PM Jason Szumlanski < >>> [email protected]> wrote: >>> >>>> I just learned from the manufacturer that the mercury displacement >>>> relay's coil is rated for 43.2 to 52.80V. Obviously, the battery voltage >>>> can exceed 52.8 pretty significantly. Does the Sunny Island regulate the >>>> output voltage on this relay to 48V or is the actual battery voltage passed >>>> through on this terminal? >>>> >>>> The more I read about this load shedding strategy, the more it seems >>>> overly complicated. It's also another thing to fail. If the N.O. contactor >>>> coil fails, the loads to the house are going to lose power. That's not good >>>> for a remote installation. I guess you have to weigh battery protection >>>> with how critical the loads are. >>>> >>>> I'm wondering why the internal Battery Preservation Mode isn't >>>> sufficient enough. What's the purpose of load shedding if the BPM does >>>> effectively the same thing. I can see perhaps shedding some parts of the >>>> load and that is a nice feature, but to protect the batteries, why isn't >>>> BPM enough? >>>> >>>> Jason >>>> >>>> >>>> >>>> On Tue, Jan 19, 2021 at 8:48 PM Mac Lewis <[email protected]> wrote: >>>> >>>>> Hi Jason, >>>>> >>>>> I have done this with mercury displacement relays: >>>>> >>>>> https://www.mdius.com/mercury-relays/two-pole-relays-contactors/two-pole-100-amp >>>>> <https://mailtrack.io/trace/link/d70ece28567af41275941f7d3b22f54c0587b1e3?url=https%3A%2F%2Fwww.mdius.com%2Fmercury-relays%2Ftwo-pole-relays-contactors%2Ftwo-pole-100-amp&userId=1613865&signature=3b642ecb564a461a> >>>>> >>>>> They do have a 100A 2P 48V coil relay. They seem to work perfectly. >>>>> >>>>> Good luck >>>>> >>>>> On Tue, Jan 19, 2021 at 2:51 PM Jason Szumlanski < >>>>> [email protected]> wrote: >>>>> >>>>>> Does anyone know where I can get a load shedding contactor described >>>>>> in SMA documentation for use with a multi-function relay in a Sunny >>>>>> Island? >>>>>> >>>>>> Thanks, >>>>>> >>>>>> Jason Szumlanski >>>>>> _______________________________________________ >>>>>> List sponsored by Redwood Alliance >>>>>> >>>>>> List Address: [email protected] >>>>>> >>>>>> Change listserver email address & settings: >>>>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>>>>> <https://mailtrack.io/trace/link/caf14456cb57eca504c4e65dd95645c6d312160d?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=e1c235b1977d450d> >>>>>> >>>>>> There are two list archives for searching. 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