Yes, you can remove the diodes. But you need to be aware that the solar panel will act as a load itself when the amount of light drops below a certain amount. If the panel were connected to a battery bank and the charge controller doesn't prevent reverse current flow, the solar panel will discharge the battery.
The most case (99%+), no need a Blocking Diode if do not connect the solar panel on battery directly. The blocking diode is not for block current from the other parallel solar panel. Indeed, a blocking diode will be installed in the charge controller or string inverter. I recently installed some used PV panels on a 24 Volt PV / Inverter system.
However, most of the solar panel array already has a built-in bypass and blocking diodes. Nevertheless, you still have to be careful. I hope this article helped you in learning about blocking diodes and how they are necessary for solar panels.
Bypass and Blocking. In this article I will explain about Bypass Diodes. In almost all crystalline photovoltaic solar panels there are bypass diodes. Panels are made up of silicon cells that each produces approximately half a volt. Linking these together in series allows the voltage to increase to the desired output.
If there were no bypass diodes, the whole solar panel would produce none or very little current. Thanks to the bypass diodes, the solar panels will still produce 2/3 of it’s rated current. In my book, I explain why shading has an influence on the current and not on voltage.
Without a series diode SOME battery energy will drain through the panel. This will usually be nowhere near as large as full panel current as a non illuminated panel acts as a low current current sink when voltage is applied. Some greater losses may occur during the dawn and dusk periods as panel voltage rises but is below battery voltage.