200A lifepo and 2kw 220V inverter hooked to traction battery?

4 of these units could add 8 kw demand and 10kwh to EV only use, I have little experience with Prius batteries.
opinions?

Voltage controlled to maintain %80 charge you could add as many as you could fit.
Basically a dc to dc converter add a bridge diode to the ac and let them run.
When soc gets low the inverter turns on.

I am a retired electronic tech, I've got 4 weeks with a 2006 Prius.
I will drive this for a few years then upgrade, that should give me time to learn what to upgrade to.