Grand Design Momentum 320G
System Schematic
Basic Parts List
- 2 - LiTime 230 Amp Hour Lithium Batteries
- Factory Installed Magnum 2000 Watt Inverter
- Progressive Industries 9360 Lithium Compatible Converter
- Victron 500 amp SmartShunt
- Factory Installed Jaboni MPPT Solar Controller
- Blue Sea 3000 Battery Switch HD On/Off
- 2 - Victron 150 Amp Four Post Bus Bars
- 2 feet - 4/0 Welding Cable - Red
- 2 feet - 4/0 Welding Cable – Black
- Red & Black Dual Wall Shrink Tubing
- Various Tinned Copper Lugs
Installation Notes
This installation was completed in August of 2025. The customer had very basic power needs and a limited budget. The RV had a factory installed solar panel with a Jaboni MPPT charge controller and a Magnum 2000 watt inverter. The customer simply wanted to upgrade the two six volt lead acid batteries to Lithium batteries with a battery monitor and replace the factory converter (that was not lithium compatible) with a lithium compatible converter. The customer also wanted to move the inverter on/off switch from the basement wall (where the factory installed it) to somewhere inside the RV so they did not have to go outside to turn the inverter on/off. I talked to the customer about various options and we came up with a plan to meet their needs. The customer chose to purchase two LiTime 230 amp hour lithium batteries for me to install. We set an installation appointment and the customer brought the RV to me for the installation.
The installation was completed in a single day and was pretty easy. I removed the old batteries and installed the customer provided LiTime lithium batteries. I made up new battery cables to connect the batteries to the RV and added a Victron 500 amp Smart Shunt to monitor the battery bank. I also added a Blue Sea 3000 HD on/off switch to allow the customer to easily isolate the battery bank from the RV for storage or maintenance. I moved all the OEM battery connections to a set of Victron bus bars that I installed in the battery compartment. I built a battery box to cover the new batteries and allow the customer to store items on top of them if necessary. I then replaced the factory installed converter with a Progressive Dynamics 9360 lithium compatible converter. Finally, i moved the simple inverter on/off remote switch from the basement wall where it was installed by the factory to an interior wall. This posed a bit of an issuethough, because the data cable for the switch was very short. These remote switches typically have 15-20 feet of cable atached to them to allow for convenient remote mounting. When I went to move this switch, i found it only had approximately 5 feet of cable attached to it. This greatly limited the options for placement of the switch on the interior of the RV. I was able to find a location down low on the stairwell wall leading to the bedroom of the RV that just reached the limited cable length available. Finally, I checked all the connections in the RV main breaker panel (at the customer’s request) to make sure everything was secure.
When the customer came to pick up the RV, I walked them through downloading the Victron Connect app and showed them how to use it to interact with the new SmartShunt battery monitor. The factory installed Jaboni MPPT solar controller also had a Bluetooth dongle attached to it. I showed the customer which app worked with it and had them download it and got them set up to see the MPPT data as well.
