[RE-wrenches] Need a hand with Sunny Island/Sunny boy AC couple

[William Miller]

12 kw PV nominal. Low tilt angle and old panels so reality is far less.
5 e-vault 18.5 kWh batteries
4 SI 6048
2 SB 6000 US

System operational for some years with flooded batteries. Just installed
the e-vaults. I reset the system to factory defaults. I am not sure how to
verify the system will properly offset frequency if batteries are full.

Having just written this I realize there is a discrepancy between the SOC
the SIs report (46%) and the SOC the e-vaults report (98%). It could be the
SIs want to push a lot of charge to the e-vaults but they won’t accept the
charge because they are charged.

I installed 3 of the vaults temporarily a week ago. At first there was a
large discrepancy between SOC from batteries to SIs. Eventually that delta
reduced to 4%. Maybe this problem will resolve itself?

What settings on the SI are necessary to enable frequency shifting?

Thanks everyone for the response. There is nothing worse than being on-site
and not knowing how to get a system to operate. I shut off the PV and will
let the generator fill in the deficit until Monday.

William Miller
Miller Solar.com
805-438-5600
www.millersolar.com


On Sat, Oct 21, 2023 at 4:57 PM Ray Walters via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> What is the array size vs the battery size?  Sounds like a big array on a
> small battery for the voltage to go that high that fast.
>
> Ray
> Remote Solar
> On 10/21/2023 5:46 PM, William Miller via RE-wrenches wrote:
>
> Friends:
>
> I’m kinda stuck on a project setting up a SI/SB AC coupled system off
> grid. When the SB inverters ramp up the battery voltage jumps to 69 pretty
> quickly and the system shuts off.
>
> I checked the mini-grid frequency and it does ramp up to about 62+ but
> apparently not soon enough to curtail charging. I shut off the SBs for now
> and we can rely on generator.
>
> Any advice via email or a phone call would be appreciated.  SMA can be
> less than helpful, especially for systems with lithium batteries.
>
> Thanks in advance.
>
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com
>
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