[RE-wrenches] APSmart RSD devices on Sol-Ark: how many strings can go thru one coil?

[david quattro]

I Have had problems with that.  don’t recommend pushing the SolArk 12v
supply any more than they will warranty.



On Thu, Jun 5, 2025 at 12:19 PM Dave Tedeyan via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> Hi Scott,
>
> Attached is the datasheet for the AP smart transmitter. It has data on
> maximum current, modules, and number of strings.
>
> However, I have a follow up question. This datasheet also says that the
> coil is 12V, 800mA. But the Sol-Ark manual specifies 12V, 100mA. Has anyone
> had issues with the Sol-Ark not being able to properly power the coil?
>
> Cheers,
> Dave
>
> On Thu, Jun 5, 2025 at 3:03 PM scot.arey--- via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Before this, never had need to install RSD with Sol-Ark but doing project
>> now that does. SolArk manual very clear on the pins to use but the APSmart
>> manual leaves some open questions.
>>
>> Question is: How many strings of PV Modules can I route through single
>> coil?
>>
>> Here we have four strings of 9-modules so I'm well below max string
>> length of 30. But the manual is silent on number of strings through a coil.
>> There is max amperage rating thru the coil (which looks like CT) but is it
>> just one string per coil? Hope not. Each APSmart transmitter can handle two
>> coils. Here is pic for reference from the SolArk manual.
>>
>>
>> *Howard "Scot" Arey*
>> *Owner, Solar CenTex*
>>
>> NABCEP PV Installation Professional
>> TECL 29755
>> 254-300-1228
>>
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