Connect non Victron inverter with Smartsolar MPPT to same battery bank

Q&A and troubleshooting
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1

We have a fixed install with a non victron inverter that charges the battery from the grid.
We’d like to connect a SmartSolar MPPT to charge the batteries when there is enough sun.
And the inverter should continue to charge when there is grid available.

Is it possible to promote the charging of the MPPT during the day although there is grid available? I was thinking to increase the charge Voltage of the SmartSolar above what the inverter is set, so it will have precedence?

Is that a correct way of doing it? Or will I break the inverter?

Currently the inverter is set (24V system) to charge:
Boost Voltage: 28V
Float Voltage: 27.4V

The 2x 12V 250Ah batteries are lead acid Gel batteries and the spec sheet says (I’ve doubled the values to be correct for a 24V system):
Float charging Voltage: 27 to 27.6V
Equalization and Cycle service: 29.4 to 30V

So my idea is to set the SmartSolar to:
Absorb Voltage: 28.2V (0.2 above the inverter)
Float: 27.6V (0.2 above the inverter)
Equalisation: 29.4V (my inverter doesn’t mention this Voltage)

Will this work? Or can’t I connect 2 chargers to the same battery bank?

2

It will work.

As per MPPT voltages, you can play with them and fine tune them for your needs.
Just don’t exceed the normal limits of a lead acid gel battery.

You won’t damage the inverter as long as you keep the voltage on its input withing the declared inverter limits.
The inverter doesn’t know from where that “energy” is coming… Battery or MPPT.
And Kirchhoff’s laws apply. :wink:

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