PV homerun to parallel loads
We have a solar powered heat pump(AC) that requires 4 panels(in series) to supply 100-300 VDC (1100 watts max) for operation. This unit will not operate 100% of time but less than 50% and its variable speed DC compressor(Toshiba/GMCC Rotary) uses varying power dependent on load, normal is 50-75% of max. (1) We would like to utilize the excess energy the PV panels that is not being used by the DC compressor(Toshiba/GMCC Rotary) while the compressor is running, excess energy (app. 50% of total), to be run to a mppt solar charge controller. (2) we would like to use all (100%) of the PV energy when the DC compressor(Toshiba/GMCC Rotary) is not running, (app. 50% of time) to a mppt solar charge controller.
In our limited ability, we see the (2) situation (simply) being handled by placing appropriate diodes in each parallel run to each load and isolating the lowest priority load (mppt solar charge controller) with a SSR when the compressor is running.
The (1) situation appears most difficult. Using the (2) setup, we would leave the SSR open (both loads having access to PV energy) and utilizing some appropriate resistance device in the low priority line to the mppt solar charge controller, to direct a greater % of current flow to the priority demand, compressor.
Looking for critique and better answers.
Thanks for your commentary/suggestions!