3.50~18 seems to have the same problem as 3.50~15 that it will not charge battery with surplus energy from the Fronius inverter (or from grid). Changed back to version ~13 and everything works fine again.
DESS active, Green Mode.
3.50~13:
3.50~18
I can confirm that with 3.50~18 in my system the batteries are also not charged by the Fronius Solar Inverter. Actually the ~18 should fix this error, which first appeared with ~15, but obviously not all errors of this problem are fixed yet.
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Hi both, noted! Thank you for reorting, Matthijs
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Hi, can you guys provide some details, like whether you have a managed battery (a BMS) or a simpler arrangement, for example only a SmartShunt/BMV?
No need, issue already identified.
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As it looks at first glance, the batteries are recharged again with v3.50~20 - thank you
Same here. Things are charging again with ~20. 
Great! Thanks for confirming!