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Posted

By Way of Introduction I have the following setup installed in the last couple of days and using the WatchPower App

RCT Axpert 5-6 Mk4

4 x 450w Solar Panels

4 x 100aH Gell Batteries

I am struggling with a couple of things with the first being below

OUTPUT SOURCE PRIORITY - When the inverter is in Solar>Bat>Utility what should I set the Back to grid voltage to where I am not going to kill my batteries when there is not enough Solar Power? I want it to use as much solar as possible during the day obviously. When I set it to Solar>Utility>Battery it simply never seems to switch over to Solar (is this because the solar is not strong enough?) The way the installer explained it was that Solar Charges Batter and Battery Powers the system, so in order to make use of Solar you need to set it to Solar>Bat>Utility but the problem is this obviously discharges the battery if Solar is not strong enough.

Posted

Added to this, the Float Voltage is 54, so am I right in saying that If I set the output to Solar>Bat>Utility and the "Back to Grid" Voltage at 54 it will use Solar and then not switch to battery at all

Posted
4 hours ago, ChadRobinson said:

Float Voltage is 54, so am I right in saying that If I set the output to Solar>Bat>Utility and the "Back to Grid" Voltage at 54 it will use Solar and then not switch to battery at all

No, it should go back to battery as it passes 54.0 V on the way to 56.4 V or whatever your bulk/absorb voltage is. But of course, it may prematurely go to float, and I don't know what the behaviour would be. It also has to be 4.0 V higher than the low battery cutoff voltage, setting 29.

So to use solar as much as possible, you should have setting 13 (back to battery) fairly low, usually 2 V higher than setting 12 (back to grid). You can make it 1 V difference, but then it may switch too often.

Once it's in line mode, it won't switch back to battery mode for a certain period of time. For the MKS firmwares, that was 10 minutes; I assume that's the same with the more recent models.

Posted
2 hours ago, Coulomb said:

setting 13 (back to battery) fairly low

How low is Fairly Low ? This Installer looks like he left everything as Default here, so I am not even sure what the settings should be 

Posted
10 hours ago, ChadRobinson said:

My Settings are currently 

Float - 54

Back to Grid - 53

Back to Battery 54

I would change back to grid to 49 V, and back to battery to 51 V. If that causes too much switching, change back to battery to 52 V. Your battery at 100 Ah is quite small for a 5.6 kW inverter, so internal resistance will play havoc. You might want to consider another string of 100 Ah battery modules.

  • 9 months later...
Posted (edited)

Good day, I have 2 x Axpert 5.6 ( SOL-I-AX-5M4) inverters with just over 8000watts worth of solar panels and for now 1 x Solar MD 14.3 battery (second one is on its way).  Can these inverters feed back/export power back to the grid?

 

Edited by TCB

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