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

Dave Tedeyan dave at sungineersolar.com
Thu Jun 5 12:34:06 PDT 2025


David,

Good to hear you experience here. I can say that Tigo's transmitter shows
up to 1A of input current. But it also specifies a max/avg power
consumption of 5.5W/.85W. I have used this one on one system and there were
no issues with it.
Cheers,
Dave

On Thu, Jun 5, 2025 at 3:29 PM david quattro <david at quattrosolar.com> wrote:

> 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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