Splitting panel dc

[ronquick]

Are there any negative in splitting the dc voltage from panels and utilizing the split signal to feed a battery backup system along with the grid?

[inetdog]

Are there any negative in splitting the dc voltage from panels and utilizing the split signal to feed a battery backup system along with the grid?

Yes.
You cannot, in general, connect two independent MPPT devices to the same power source (e.g. set of panels). The two MPP-seeking inputs will interfere with each other's tracking and scanning mechanisms.
And you cannot combine an MPPT input to a GTI with a PWM CC under any circumstances since the voltages are not compatible.

You could use a CC only and a hybrid inverter with sell-back capability to get the same effect as what you describe.

Or you can use a switch to divert one whole string of panels between the GTI connection and the CC connection. The switch must be capable of handling (interrupting) DC at the panel voltage and current.

[ronquick]

Yes.
You cannot, in general, connect two independent MPPT devices to the same power source (e.g. set of panels). The two MPP-seeking inputs will interfere with each other's tracking and scanning mechanisms.
And you cannot combine an MPPT input to a GTI with a PWM CC under any circumstances since the voltages are not compatible.

You could use a CC only and a hybrid inverter with sell-back capability to get the same effect as what you describe.

Or you can use a switch to divert one whole string of panels between the GTI connection and the CC connection. The switch must be capable of handling (interrupting) DC at the panel voltage and current.

I am currently grid tied with micro inverters and would only utilize the backup if the grid goes down. I would disconnect from the grid utilizing the breakers and then plug power up the backup?

[inetdog]

I am currently grid tied with micro inverters and would only utilize the backup if the grid goes down. I would disconnect from the grid utilizing the breakers and then plug power up the backup?

I am not worried about how you handle the AC side (assuming that you follow the NEC). But you will have to include a grid-driven battery charger if you do not connect at least some of the solar full time to the CC.
The last thing you want is to start into a backup event with the batteries at less than full charge.

[ronquick]

I am not worried about how you handle the AC side (assuming that you follow the NEC). But you will have to include a grid-driven battery charger if you do not connect at least some of the solar full time to the CC.
The last thing you want is to start into a backup event with the batteries at less than full charge.

I would be using an existing battery bank from my golf cart that include a grid driven charger. Thanks for the info.