I finished connecting the Multiplus II 48 3000 35 with a SmartSolar charge controller MPPT 150 70 and 8 12.8 V 150 Ah LIfePo batteries (2 sets paralleled, each set with 4 in series). The inverter switches between solar and battery as needed, but if there is no solar or battery, it does not automatically switch to utility power. Is there any way to have it switch to utility power automatically when there is no solar or battery power? I have it in inverter only mode because if I turn on both the charger and inverter, it charges the batteries with utility power. I understand that if I get a GX device I can control priority of the source. Does that apply to utility power as well? I currently do not have a GX device.
If you have a GX device, you can install the ESS Assistant. It’s a really handy tool. When used with DVCC enabled, you can disable the inverter/charger’s AC charging by setting the charge current to 0 A. The system will continue to charge the battery from the MPPT solar.
You can also set a minimum state of charge (SOC) to prevent the battery from discharging through the inverter. Once the SOC limit is reached, the system will automatically switch to pass-through mode.
If needed, you can increase the DVCC charge current limit at any time to allow the inverter/charger to top up the battery helpful in poor solar conditions or if you want to ensure the battery stays charged.
Also, if you’re running 4×12 V batteries in series or parallel, did you install a battery balancer?
Thanks for the info. I do not have a battery balancer. I do have a battery monitor Victron BMV-712 and I have a question about that. I connected it as shown below. I’m not sure if B2 is connected to the proper location. Directions say midpoint of the battery bank, but is what I’ve shown considered the midpoint? Thanks again for all the help.
No thats not midpoint, also battery negative should be wired opposite of postitive (circle is midpoint), and keep all battery wires exactly the same length for positive and negative and from battery to battery
Thank you for that. Does it matter which point is considered midpoint? Does the battery monitor actually monitor all 8 batteries individually or as a set?
The midpoint will measure 24V. I still have 2 banks of 12Vx4 for a 48V system. I use these to keep them balanced. They work really well. 12V will get unbalanced very quickly.
