I have an offgrid installation utilizing 4x TS4-A-2F Tigo RSD devices on 8 Qcell modules running to a Sol-Ark 8k inverter/charger. It was working fine late summer and fall, but when ambient temp drops below freezing at night, the Sol-ark reports insufficient PV voltage in the morning to start ( goes from <2vDC to 4-5 vDC at sunrise, but then gets 'stuck' ) until ambient gets above freezing for a while, and then the system kicks on.
The Sol-ark and battery cabinet are inside a nice warm garage (65 deg F), so I don't think the Inverter could even know what the outside temp is. The Sol-ark output to load is fine, but the charger doesn't see pv voltage jump from 5v to 250+ to start any pv production until late in the AM. This is no good since this off-grid installation needs every bit of available production in the winter.
------------------ updated 11/24/23 to re-open this issue ---------------
....because adding the Tigo 12v - 1A power supply has turned out to NOT fix whatever the root issue is. After a couple weeks of mild weather and nights above freezing, we got another cold night in the 20s(F) last night. And the 'late start' issue has returned. So, since the RX has a good power supply now, the issue 'seems to be' the TIGO TS4-A-2F units are not 'waking up' reliably after cold nights.
Anybody else having this problem ?
------------------ updated 11/10/23 with possible solution --------------
night time temps <32F may be bit of a red-herring, but only indirectly. What was looking like the root issue is that the 12v (100mA) power supplied inside the Sol-ark is ok *most of the time* to run a Tigo RSS installed right there inside the cabinet.
BUT, under certain conditions, like cold morning startup, either the 12v is sagging, or the peak power blip to run the Tigo exceeds internal capacity, 12v power is cut, and Tigo shuts down the PV until proper 12v is available from Sol-ark.
SOLUTION is, don't use the Sol-ark internal 12v until they beef it up, buy and use the external Tigo enclosure with the DIN rail mounted power supply.... except this turns out to NOT fix the problem.
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