Posted January 11, 20223 yr If I am posting erroneously in the wrong arena, pls feel free to put me right . . . Whereas I think I understand inverters fairly well, there is no doubt that the devil lies in the detail. In this load-shedding environment, my first concern is to preserve the charge in the 5.5kW Hubble battery, and recharge as quickly as possible to protect my essential circuits from LS. How then do I configure the inverter to use as much of the 3kW of solar available, without it blending in battery power when the load exceeds the solar power, which happens easily in our cloudy weather at the coast? There are so many ingenious methods and devices used by so many clever folks on the forum, but it would seem to me that either I need way more battery (costly), or a Sunsynk (not so costly) that can blend in mains with the solar (if I understand this correctly), or maybe even another el cheapo inverter in parallel, but configured differently. Thanks in anticipation . . .
January 11, 20223 yr Welcome to the forum. 4 hours ago, BigC said: How then do I configure the inverter to use as much of the 3kW of solar available, without it blending in battery power when the load exceeds the solar power, Sadly, the Axpert model that you have doesn't have this capability. What you want for that specific application is SUB mode, which is one that the 450 V and 500 V max PV voltage models have, and also the Axpert King (though the Kings do it by double conversion). These other models have the ability to blend AC-in (e.g. utility) power and PV power, and can even operate with no battery at all. That way, they can keep the battery completely full, so that it can power load shedding for the longest possible time. As to whether and how easily other brands can do this blending, I'll leave that to others.
January 13, 20223 yr Author Thanks for confirming that Coulomb. And thanks for the additional info .. that is new to me.
January 16, 20223 yr In order to have the most capacity for LS you want to use the highest setting for back to grid. 25.5/51V depending on 24/48V model. Although as stated a number of models cannot blend grid with the PV available if the load exceeds the PV produced at any time. Look at the models with a setting SUB for this. Up to MKS ii did not have it and only SBU. At 25.5/51V going to grid does not leave much power in the batteries should you get load shedding if using lithium but nearly the full capacity if on lead acid. Some saving can be achieved by using charge only from PV during non LS periods. This means for the 2 hours a week we get LS you want to change the setting to also charge from grid. It is one setting you can flick between the 2 periods. Edited January 16, 20223 yr by Scorp007
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