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

[Dave Tedeyan]

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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