Electronics > Power/Renewable Energy/EV's

Voltage regulator for solar panel

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wa4whl:
I'm rebuilding a regulator board for a solar panel array and unable to identify a regulator chip by the markings.  The device is 8-pin surface mount with the markings SAQ 7BK A9S4.  So far I've tried every combination and nothing.  Any idea what this is? 

nsrmagazin:
If you post a few pictures that will be very helpful for us. Is replacing the regulator circuit an option? its most likely a voltage and current regulator

Doctorandus_P:
What is the size (power / voltage / current) rating of your solar panel?

MPPT charge controllers start from < EUR 10 from Ali / Ebay / China.
For devices like that it is hardly worth rebuilding.
https://www.aliexpress.com/wholesale?SearchText=mppt

nsrmagazin:
I would recommend this one in particular:
www.cfcbazar.com/products/oem-lcd-display-20a-mppt-12v-24v-solar-panel-battery-regulator-charge-controller-without-any-logo-on-surface-t20-lcd-wholesales/
Its with high quality.

jonroger:
Be careful, many solar charge controllers labeled "MPPT" are actually PWM.     A 20A, 24V DC-DC converter involves a certain amount of cost and heat (ie, heat sinks).

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