The answer is no, off grid solar power plant require batteries to store electricity. If the grid power isn't available and batteries are out of equation too.
[pdf] Battery Energy Storage Systems, or BESS, are rechargeable batteries that can store energy from different sources and discharge it when needed. BESS consist of one or more batteries and can be used to balance the electric grid, provide backup power and improve grid stability.
[pdf] In Mongolia, the National Power Transmission Grid has secured a loan from the Asian Development Bank (ADB) to install the country’s first large-scale advanced battery energy storage system (BESS).
[pdf] Lithium-ion batteries function in solar storage systems by storing excess energy generated from solar panels for later use. When solar panels produce more electricity than is needed for immediate consumption, the surplus energy is directed to charge the lithium-ion batteries.
[pdf] This tutorial defines an equivalent circuit model for a nickel-metal hydride (NiMH) battery. A similar modeling approach may however also be used to model other battery chemistries. The 0D model simulates a nickel-metal hydride battery using an equivalent circuit model.
[pdf] Equipped with an advanced Battery Management System (BMS), the ES 48100 ensures comprehensive protection, optimizing battery health and extending the cycle life to over 6000 cycles.
[pdf] 
