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

[Chris Sparadeo]

Hi William,

You will want to make sure that the eVaults are all running that same
firmware and that terminator switches and battery ID #s are set correctly.
High SOC and large incoming current could definitely be the reason why
voltage skyrocketed up.

Best,

Chris

On Sat, Oct 21, 2023 at 9:39 PM William Miller via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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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