Greetings All,
It’s been a minute since I have needed some assistance, as I have built with the help of the community, a shore power solution that is super solid but now need assistance with building a solar solution. I am simply looking for some calculations and or MPPT suggestion. I will state what my plans are with calculations to hopefully get to a quick solution.
First off the solar I am planning on using is 450W with the following devices:
1: Victron MPPT Solar Charger - Unknown Model
2: Victron Battery Charger - 12V model
3: Victron Cerbo GX Comms Unit
4: Cellular Modem - 12V
5: Din Rail PoE Switch - 9V-36V
6: DIN Rail Web PLC Controller (may not use) - 9V-36V
7: Lithium Battery - Sun Fun 315Ah 12V w/ Comms for Victron
8: Field Devices (various) hooked to PoE Switch
Total expected Wattage: 58 Watts to 68 Watts. Would like to plan for a max wattage of 75 Watts (6.25 amps @ 12VDC). Wattage could be less depending on how this is ultimately configured overall.
Solar exposure I want to utilize the numbers for winter based in a location I know has low numbers which is a zipcode of 72901. Its looking like 3.5 (realistic this winter month) 3.0 (use for lowest figures to CYA) Average Isolation Measured in kWh/m2/day. Average fluctuates between 3.5 and 6.7 depending on month.
Can someone help identify what MPPT would be recommended, and a shunt is needed for the Sun Fun since it uses BMS and a Victron Communications directive? In the past I’ve used one but that was with SLA.
Battery is 315Ah and (kWh) Capacity of 4.1.
Also can someone help identify the loads/return of charge for this type of setup ie: 6.25A will net me roughly 50 hours of no-solar input. At 75 Watts will get you “X” amps back into the battery and also be able to handle the load with an estimated recharge time of “X hours”.
TIA !!!