[RE-wrenches] Older Sunny Islands charging newer Lithium's

[Mac Lewis]

Hi Peter,

The Sunny Islands will work with Lithium, but there can be challenges.  The
Blue Ion to Sunny Island communication works really well, you need a Namaka
box for that.  This would be a great but expensive way to go.

The difficulties with Sunny Island and no communication to BMS is when you
need the Sunny Island to start the generator at a specific state of charge
or also know when to shut down.  The open loop parameters seem to work just
fine for charging.

One cheap solution that I think would work well is to add a Victron Smart
shunt, Cerbo and perhaps a screen.  You can manipulate the SOC algorithm in
the smart shunt to work well and turn the generator start duties over to
the Cerbo.  You may also be able to externally trigger the Sunny Island to
shut off (haven't looked deeply into this).

Have a good weekend!




On Fri, Mar 1, 2024 at 3:10 PM Jerry Shafer via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> SMA and Li Tech
> I have replaced quite a few batteries with LIPh and the only thing on the
> 4048's is setting a temp sensor at default 77 Degrees and on the 5048"s as
> i recall can be closed loop with fortress and Blue Planet.
> Fun Times
>
> On Fri, Mar 1, 2024 at 12:52 PM Peter Giroux via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> My fellow wrenchers. Have sought help from SMA but they just defer to
>> owner’s manuals and the older batteries listed.. I have a customer with two
>> SMA 5048’s, roughly 11 years old and appear to be working fine. Customer
>> wants to move to LIPO batteries and keep his SMA’s. Has anybody made these
>> transitions and how did you do it, not sure the SMA programing for LIPO’s
>> works the way Lithium’s need. Any and all help and ideas appreciated.
>>
>>
>>
>> Thx
>>
>> Peter Giroux
>>
>> American Solar & Alternative Energy Solutions inc
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-- 



Mac Lewis

*"Yo solo sé que no sé nada." -Sócrates*
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