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2 PV systems - one acting as grid
I have an off-grid PV system (s1) with the panels mounted on a ground rack.
The rest of the equipment (inverters, charge controllers, battery) is located in building 1 (b1).
The s1 load out feeds the home panel of b1 and can deliver a constant load output of up to 12kW.
Building 2 (b2) is about 200ft away and its home panel is also connected to the s1 load out.
The system works great and has enough power and battery storage to satisfy the energy needs of both b1 and b2.
Matter of fact, the battery is filled up early in the morning and I am wasting all the PV production I could harvest the rest of the day.
To make better use of the excess PV production, I'm planning to get an EV that will be charged in b2.
The excess production of s1 is not enough for the EV, So I plan on adding another PV system s2.
For s2, I will add PV panels (8-12kW) on the roof of b2. These panels will feed a new charge controller and inverter at b2.
The EV charging will real-time adapt to the excess PV production available so it is not depleting the home battery.
Monitoring the charge level of the home battery, the active home load and the PV production output will be necessary to adapt the level 2 charger current output for EV charging.
Most likely using OpenEVSE hardware to implement this - see https://docs.openenergymonitor.org/a.../solar-pv.html.
I only plan to charge the EV during the day with excess PV production.
If no EV is connected to s2, I would like the s2 PV production to help with the home loads and charging of the s1 battery.
If an EV is charging, I would like all of the excess PV production from both s1 and s2 to help charge the car at maximum power available.
I'm considering that s1 grid input needs to be connected to the home panels - i.e. the s1 load out and home panels are treated as grid.
Has anybody done something like that and should I be worried about the s2 load out being connected this way?
S1:
(24) 370W PV panels (8.88kW) configured as 2 strings (12) panels each
(2) Charge Controllers(s) - SCHNEIDER ELECTRIC XW-MPPT 100-600, each connected to a string
(2) parallel connected Inverter(s): SCHNEIDER ELECTRIC Conext XW+ 6848, 6.8 KW 120/240 INVERTER/CHARGER
(1) lithium battery bank 28kWh/48V
S2:
(18-30) 400W PV panels
considering SolArk or EG4
The rest of the equipment (inverters, charge controllers, battery) is located in building 1 (b1).
The s1 load out feeds the home panel of b1 and can deliver a constant load output of up to 12kW.
Building 2 (b2) is about 200ft away and its home panel is also connected to the s1 load out.
The system works great and has enough power and battery storage to satisfy the energy needs of both b1 and b2.
Matter of fact, the battery is filled up early in the morning and I am wasting all the PV production I could harvest the rest of the day.
To make better use of the excess PV production, I'm planning to get an EV that will be charged in b2.
The excess production of s1 is not enough for the EV, So I plan on adding another PV system s2.
For s2, I will add PV panels (8-12kW) on the roof of b2. These panels will feed a new charge controller and inverter at b2.
The EV charging will real-time adapt to the excess PV production available so it is not depleting the home battery.
Monitoring the charge level of the home battery, the active home load and the PV production output will be necessary to adapt the level 2 charger current output for EV charging.
Most likely using OpenEVSE hardware to implement this - see https://docs.openenergymonitor.org/a.../solar-pv.html.
I only plan to charge the EV during the day with excess PV production.
If no EV is connected to s2, I would like the s2 PV production to help with the home loads and charging of the s1 battery.
If an EV is charging, I would like all of the excess PV production from both s1 and s2 to help charge the car at maximum power available.
I'm considering that s1 grid input needs to be connected to the home panels - i.e. the s1 load out and home panels are treated as grid.
Has anybody done something like that and should I be worried about the s2 load out being connected this way?
S1:
(24) 370W PV panels (8.88kW) configured as 2 strings (12) panels each
(2) Charge Controllers(s) - SCHNEIDER ELECTRIC XW-MPPT 100-600, each connected to a string
(2) parallel connected Inverter(s): SCHNEIDER ELECTRIC Conext XW+ 6848, 6.8 KW 120/240 INVERTER/CHARGER
(1) lithium battery bank 28kWh/48V
S2:
(18-30) 400W PV panels
considering SolArk or EG4
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