In our shop, you can choose between two connector variants, 220 amps and 300 amps load capacity. This article explains which LFP connectors are suitable for which charging and discharging currents.
I Know the Output of My Solar System and the Voltage (Volts) of My Energy Storage.
Many planners of a DIY home storage system initially only know the peak output of their solar system in kWp. The following table shows the maximum load capacity of the LiFePO4 connectors in relation to the peak output of the solar system.
Example: My 48-volt energy storage system with LiFePO4 connectors up to 220 amps can roughly be charged with a solar system up to 10.5 kWp.
Calculation examples for the 220A version of the connectors:
\[ P = 48 , \text{V} \cdot 220 , \text{A} = 10.560 , \text{W} = 10,56 , \text{kW} \] \[ P = 24 , \text{V} \cdot 220 , \text{A} = 5.280 , \text{W} = 5,28 , \text{kW} \] \[ P = 12 , \text{V} \cdot 220 , \text{A} = 2.640 , \text{W} = 2,64 , \text{kW} \]Calculation examples for the 300A version of the connectors:
\[ P = 48 , \text{V} \cdot 300 , \text{A} = 14.400 , \text{W} = 14,40 , \text{kW} \] \[ P = 24 , \text{V} \cdot 300 , \text{A} = 7.200 , \text{W} = 7,20 , \text{kW} \] \[ P = 12 , \text{V} \cdot 300 , \text{A} = 3.600 , \text{W} = 3,60 , \text{kW} \]I Know My Multiplus and the Voltage (Volts) of My Energy Storage.
The energy storage is charged with the Victron Multiplus 2 in charger mode and discharged in inverter mode. The maximum charging current can be found in the Multiplus data sheet under Charger -> Maximum battery charging current. The maximum discharge current can be found in the table below. The formula is \( I = P / U \) or \( Ampere = Watt / Volt \).
If you know which Victron Multiplus 2 you want to use and whether you want to build a 48 volt, 24 volt or 12 volt energy storage system, the following tables will help you:
Single-phase Operation
For a 48 volt energy storage:
| Inverter | Max. charging current | Max. discharge current | LiFePO Connector |
|---|---|---|---|
| Victron Multiplus 2 48/3000/35-32 | 35 A | 2400 W / 48 V = 50 A | 220A |
| Victron Multiplus 2 48/5000/70-50 | 70 A | 4000 W / 48 V = 83.3 A | 220A |
For a 24 volt energy storage:
| Inverter | Max. charging current | Max. discharge current | LiFePO Connector |
|---|---|---|---|
| Victron Multiplus 2 24/3000/70-32 | 70 A | 2400 W / 24 V = 100 A | 220A |
| Victron Multiplus 2 24/5000/120-50 | 120 A | 4000 W / 24 V = 166.6 A | 220A, better 300A |
For a 12 volt energy storage:
| Inverter | Max. charging current | Max. discharge current | LiFePO Connector |
|---|---|---|---|
| Victron Multiplus 2 12/3000/120-32 | 120 A | 2400 W / 12 V = 200 A ⚠️ * | 300A |
| Victron Multiplus 2 12/5000/220-50 | 220 A ⚠️ * | 4000 W / 12 V = 333.3 A ⚠️ * | — |
*) The extraction of such high power (watts) represents the maximum load for a 12 V battery!
Avoid such a configuration.
Three-phase Operation
For operation with three Victron Multiplus 2, take the maximum discharge currents * 3.
We always recommend the 300 Ampere version for this.
| Inverter | Max. discharge current |
|---|---|
| Victron Multiplus 2 48/3000/35-32 | 50 A * 3 = 150 A |
| Victron Multiplus 2 48/5000/70-50 | 83.3 A * 3 = 250 A |
