No, Topo’s Red solar input has a built-in solar regulator, also known as a solar charge controller, is a device that regulates the flow of Direct Current from a solar panel to a battery. It is designed to prevent overcharging and over-discharging of the battery, which can damage the battery and shorten its lifespan.
A solar charge controller regulates the current and voltage coming from the solar panel and ensures that the battery is only charged within its safe operating range. It also prevents reverse current flow, which can occur at night when there is no sunlight, and can drain the battery.
Topo’s Built-in solar regulators are built-in to all our lithium systems and are rated to match 12V and 24V solar panels ( open circuit voltage of 20-50V) and Max charge input of 25Amps.  If using your own additional solar controller in series please consider that Topo’s Red Solar Input is ” passive” by design and will only accept an “active” solar charge supply.
It is important to note that the solar panel, battery and load should be matched with the solar regulator capacity and specifications.