If you’d like to increase your battery storage for the Titan without using Titan expansion batteries you can do so by utilizing the battery expansion port to the side of the Titan. You will need our External Battery Expansion Wire with 150A Breaker in order to do this (two if you are running more than 50% from external batteries on the boost, and three if you are running the 240sp). Please follow these steps when connecting external batteries to ensure the Titan is not damaged.

1. Make sure your external batteries are 24v.
The Titan only utilizes 24v batteries. You cannot connect an external battery through the expansion port if it is not a 24v battery. If you have multiple 12v batteries you can connect them together in series so that they become a 24v battery. If you have multiple 24v batteries you would like to use, you can connect them together in parallel so they remain 24v batteries.

2. Make sure your external batteries can be charged up to 28.8 volts.
Most 24v batteries can be charged up to 29.2 volts but it is a good idea to double check that your external batteries can be charged up to this level as the Titan will try to charge them up to 28.8 volts when connected through the expansion port.

3. Make sure your external batteries and Titan batteries are at the same level of charge.
Before connecting your external batteries to the expansion port on the Titan, you will need to make sure they are charged within 0.5 volts of the Titan batteries. If the Titan batteries and external batteries are not within the same voltage there can be damage when connected. For example, if your Titan batteries are at 27v you will want to charge your external batteries to 26.5 – 27.5 volts before connecting.

4. Make sure your battery bank underneath the Titan is larger in watt hours than the battery bank connected through the expansion port (unless you use two expansion wires).
The Titan inverter can pull up to 3000 watts continuously. If you have a bank of batteries underneath the Titan and to the side of the Titan through the expansion port, the inverter will pull this maximum wattage through the bank of batteries that is largest. Because of this, you should ensure your bank underneath the Titan is larger in watt hours than the one to the side of the Titan (unless you use two battery wires). The reason for this is because the bank of batteries under the Titan are connected through 2 sb50s while the bank of batteries connected through the expansion port are only going through 1 sb50 (unless you use two wires connected to two sb50s. However, if you do not plan on pulling more than 1500 watts through the Titan, you can have a larger battery bank in watt hours through the expansion port.

5. Reprogram the battery meter accordingly.
You’ll need to reprogram the amp hours on the Titan to account for the additional amp hours added from the batteries through the expansion port. Remember, connecting batteries together in series does not add amp hours together, only voltage. So if you connect x2 12v 100ah batteries together in series, you will now have x1 24v 100ah battery.