gtslabs wrote:

I am using electrolytic caps for the startup. I think I read somewhere
NOT to use them for run capacitors. Tuning it was my next step.
However I only use this converter for this compressor and it is not
needed on all day, mainly when I am sand blasting. I was uning a tong
type meter.


This has nothing to do with start capacitance or tuning caps or balancing
current between legs, nothing whatever. I'm talking about power factor
correction capacitors.

Here is what Gary Coffman posted once on this subject:

"Power factor correction caps connect between L1 and L2. The value
is whatever reduces the 1 ph line current from the service entrance
to the lowest value. Again experimentation will be required. Do this
*after* you balance the converter, if you're going to balance it. The
value won't be the same for a balanced converter as it will be for
an unbalanced converter. (Usually, it'll be smaller for a balanced
converter.)

"What the power factor correction caps do is cancel the inductive
reactance due to the motor which is seen by the service entrance.
This reactance can set up high circulating currents in the primary
feed if it isn't canceled. These are wattless watts in the sense that
the current is out of phase with voltage and doesn't represent real
power being drawn from the utility, but they can cause the wires to
heat up (series R loss), and require you to use a larger than normal
breaker to prevent nuisance tripping."