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I should add ... we have had lightning strike across the street close enough to get some metal going sparky via induction in places on the property, but only a little, and the SI/SB/Panels are all ok :)

I have: PV String 1 > MN 600 > SPD > SB ( repeat for all 3 strings) All panels EGC > MN box > SB chassis SB emergency Power port EGC also to SB chassis And now SB N to SB Chassis The SB L1/L2 go to a normal breaker in the panel pedestal next to it which has 3 wires The breaker panel has an...

bridging N tro the SB Frame ground worked for Island mode Now I need to get my "third" wire over to this thing. Just noticed I never brought over the EGC from the panel this thing hooks to >__< Just L1/L2

I can see nothing in the documentation stating Island 60Hz requires N :/ I do have an EGC I could tie to Neutral but isn't that essentially bonding G/N at the SB? There are some "rules" which explicitly are listed L-L and L-N-L and I suspect all L-L would "work" in my case. I have seen the...

Looking at settings. I see "Start point of the power control via frequency" which is 1.00 and End is set to 2.00, is this what you were referring to?

Set to island 60hz, 103 error ... set ac side voltage / grid voltage to 240 but no dice. I have 2 wires going to this unit which provide the 240 without a neutral. Reverting to rule 21 L-L and the code clears.

Going to have to request grid guard code, it is indeed setup as rule 21.

94.8% SOC now .. still kicking at 30amps in boost mode with 1 minute before it switches to float mode. 1kw dump load still running ... I like it but it still means "work" till we have a real dump load of living on site.

Currently at 84% SOC, still have 1kw load, battery charging around 35a. Our water heater isn't even hooked up yet, but it will be preheated with our 1080 gallon thermal storage tank which is heated from either the boiler or, most of the time, our solar evacuated tubes ... so it might be it...

Have had the 1kw load on the system for a little now. SI is charging the batteries and it peaked at 110a before I dropped it back down to 70 as the high setting. I know you love me. With the added load the charging changed from float to boost. And it is boosting off and on, will see what...

Next week I will shift it over

one, SB 7.7 US-41

yeah I saw that in the book as well ... not sure if distance plays a part but the panels are a good 300ft from the SI inverters.

I don't see what this is testing for if the SI won't go above say 30A when charging right now, I say right no as if the batter was lower in voltage (currently 53.4 I think) I Have seen it max out at the amps set. I set it to 140 which should be .5C My BMS is isolated ... the only thing it can...

I dont' think so https://ressupply.com/documents/sma/SB_3.0-7.7-US-41_User_Manual.pdf pg22 has the screen outputs.

Ok, just went through a 7 minuteish cycle of charging. It started to throttle at 60.5 and got to 0 output at 61.5

Next time it starts to dump something into the battery I will see how it throttles off ... I can't check SB settings likely till next week as it requires me to go home to get the laptop I need.

It is at 65 now, but it hasn't come close to approaching this. When the BMS controlled the charging I could easily get 95% every day but the timeout is the issue :/

I will have to go over to the panels and check on the SB settings. It is a 7.7 US-41 though. I forget if I went with. I will run out there in a sec and look. Scratch that, I don't have the required laptop here to do that ... my current one doesn't have a hardwired input :/ Battery is set 48vdc...

Just gave the inverters a 1500w load for 2+ minutes. Battery took 100% of the load and after about 2 minutes the PV took the load and was charging the battery as well. Removed load at 3 minutes and now it is ramping the charging back down. Still indicating float mode. SOC post ramp down is 77.9...

Observations now I have had an hour or so of sun. I set float to 2.3 from 2.27, while in float voltage was 54. Float stopped putting energy into battery though and now at 53.1. I watched it ramp down the amps as the frequency ramped up to 61.5 if I recall correctly. Then the frequency dropped...

300 is beyond 1C though? Thought these batteries (since they are all essentially rejects that were not good enough for automotive use) liked .5C max? Updated details in post above, also 80% SOC (53vdc) should mean only ~60ah is missing ... at 50ah that should mean 1-2 hours of charging...

100% offgrid with gen backup set 2x SI set to 60hz "split phase" single cluster 12.5kw of panels into a SMA SUNNY BOY 7.0 which maxes out at 7.5kw 240 AC (though I have only done it twice when running two large power drainers and charging from 30% SOC) SB is not connected to the SI via COMMs so...

Obviously not into my battery :/ I start the day around 52.8 and end at 53.0 on average ... we have a small 200w load at night and during the day small peaks of 1.5kw use for a couple minutes then nothing for the day. This morning I woke up, cycle was on "Full" with 4.5hrs to go, I was...

Have had it setup vlra since it was suggested here ... most of the time the battery is hovering in the low 80%'s even after a sunny day ... today, full sun, end voltage 53.0 ... I am using the 2.36 / 2.27 suggested above and even set my "full" frequency to 1 day vs the default 14 as I thought...

just broke out book and saw that lol ... was about to post since I answered my own question.

shouldn't this be 3.36 and 3.30 ? I can't see a way to adjust the voltage that high on the SI for VLRA.

Not that you have to but now you have some type of incentive to hook up a shunt :D ... only if you want to experiment that is.

The 50 amp is the limit for the shunt reading not the grid so far as I can tell from experimenting this morning. After I got the shunt reading I could change the settings live and it would adjust. That said it is only reading half of the load going into / out of the battery. The reason it was...

AGAIN! ... 0430 today it looks like the power shut off ... I came in and the BMS again had reset itself to a default state, the battery voltage was about 30% SOC this time. I reset it all, and reset the SOC the configured the SI for VRLA and started things up to find the SI dumping 6000w into...

280ah, all eve cells, when one spikes above 2.65 if I recall correctly the BMS disables charging. 30amps is the setting, the SI will spike it up to like 50 for a moment or two before ramping down to 30. If I had it set to 50 it would ramp to 70ish ... the ramping when it first starts charging...

My BMS just monitors the cells and makes calls for charging or takes action when certain conditions are met. Shouldn't need coms to do that. But I know if I throw more than 30 amps into my battery my cells will spike and the BMS normally would call to halt charging to protect against over...

Do you have a link to a thread with your current settings? I assume your doing LiFePo4 in 16s and some number of those in parallel ... And I assume the SI would have no clue, open loop, that a individual battery is beyond its limits and not know when to stop charging?

without comms going to the SMA from a BMS hooked up to the LFP the SMA SI will not run :/ let alone charge when asked to. The whole unit will turn itself off right now and restart when the comms drops for a second (one of the current issues with the batrium I have)

Yeah the comm's is a must for SMA with any LFP batteries :/ ... it is pretty though.