Does Healing Wave grant Solar when drones are at full health

As of Patch 2.6 (released August 28, 2014), the old Solar-based level system was removed, possibly due to the fact that it didn't do anything besides give an approximate amount of Solar a character had collected.

However, a new leveling system was introduced in Patch 2.13 (released December 2, 2015), with levels being gained by killing neutral and enemy units and structures instead of directly through Solar gain. Experience is shared among an entire team, and every level a team gets increases the health, damage, and regen of the team's players, and the health and damage of the team's droids.

When you die:

For every death, no matter how you died (killed by droid, other awesomenaut, or suicide):

• You lose 30 solar.
• Each enemy receives 30 solar

So the above happens no matter what, every time you die. In addition to the above:

Killed by enemy awesomenaut:

• The killer receives 30 solar

Other deaths (droid, suicide, any other reason other than death to enemy awesomenaut)

• You drop 30 solar on the floor

So the total amount of solar up for grabs and lost by you is the same in all cases. It only differs in how it's distributed.
Meaning, it's better to not be killed by an enemy awesomenaut, because there is a chance that the 30 solar dropped on the ground can be picked up by teammates or left on the ground, rather than going straight to an enemy.
So suicide or dead by droid is a slightly better option. That's the only difference though.