I have been asked to look after a solar system that has the following, SmartSolar charge controller MPPT 100/50 charging 2 batteries in series for 24volts (needed for a fridge), there is a isolated DC/DC 24/12 - 30 feeding a 12volt RT, and a Sun Inverter 12/250 this feeds lights and a califont, the 230volt keeps dropping out, we have now installed a 12volt battery after the 24/12 DC/DC converter and the inverter no longer cuts out. Question is, do we need this battery or is there a fault with one of the units?
I would say you need the battery. Items can have a start up current higher than the steady current, water heaters take more current when the heating element is cold. If any short term load is larger than the DC to DC converter capacity then you can have trouble with low voltage transients, which may cause the inverter to shut down. A buffer battery will smooth these transients out.
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