"Steve Lusardi" fired this volley in
:

Lloyd,
These holding plates are filled with a fluid medium and they are
around 18" x 24" x 4" . How much high side and low side tankage
would
be enough in cubic inches to self regulate do you think?
Steve

That's not nearly enough information. You need to know the heat load
at pretty much all operating conditions. You also need to know the
condensor operating conditions. For a job of this nature, I doubt
you'll ever gather enough good info to do it.

Lacking that information, and doing it simply by 'overkill', you'll
have to follow Jon's advice, and keep the compressor running any time
either TEV is open.

You can do that by adding a low-side switch that monitors the
evaporators' exit pressure, and turning on the compressor any time it
goes higher than your desired preset.

LLoyd