dudedogvan
New Member
- Joined
- Mar 10, 2022
- Messages
- 95
If I have a 12V system with DIY 280ah LiFePO4 battery, 400w solar panels, 40A-60A MPPT, and a DC-DC charger and I want to add either an AC charger (standalone) or AC charger/inverter combo does the MPPT cut off charge from the solar panels because it senses incoming voltage from AC input when I connect it?
Does it involve an automatic transfer switch? If the AC charger and inverter are separate do I need to install a transfer switch?
I plan to add a manual switch to turn on/off dc-dc charger (most likely 20A) when I'm driving, is this necessary? If the panels are charging while I'm driving and dc-dc is switched on, how does the dc-dc charger know how much to supplement charging the batteries, or does the dc-dc charger supply a constant 20 amps and the MPPT continues to supply max amperage from the panels as well?
How does the BMS work alongside the different charging components? When temps are too low/high (0 celsius to 67 celsius I think) there is a cutoff. Other than that what is it doing in relation to other charging components? Does it just regulate health of individual cells with balance leads?
I'm a newb, basically I'm trying to understand how the 3 different charging sources and BMS will safely work together to charge a 280ah DIY battery properly. For example, if I'm parked idling the engine with the dc-dc charger on, mppt supplying solar in sunny location, and an extension cord plugged into the AC charger from a 110 house outlet, how will the charging components safely charge the 280ah LFP battery together? Please help me understand how it all works together. With that understanding, I can choose the components for my 12v campervan electrical system and draw up a wiring diagram which I can post for critiquing by those of you MUCH more experienced than I, ensuring a safe design and optimal battery health and longevity.
Does it involve an automatic transfer switch? If the AC charger and inverter are separate do I need to install a transfer switch?
I plan to add a manual switch to turn on/off dc-dc charger (most likely 20A) when I'm driving, is this necessary? If the panels are charging while I'm driving and dc-dc is switched on, how does the dc-dc charger know how much to supplement charging the batteries, or does the dc-dc charger supply a constant 20 amps and the MPPT continues to supply max amperage from the panels as well?
How does the BMS work alongside the different charging components? When temps are too low/high (0 celsius to 67 celsius I think) there is a cutoff. Other than that what is it doing in relation to other charging components? Does it just regulate health of individual cells with balance leads?
I'm a newb, basically I'm trying to understand how the 3 different charging sources and BMS will safely work together to charge a 280ah DIY battery properly. For example, if I'm parked idling the engine with the dc-dc charger on, mppt supplying solar in sunny location, and an extension cord plugged into the AC charger from a 110 house outlet, how will the charging components safely charge the 280ah LFP battery together? Please help me understand how it all works together. With that understanding, I can choose the components for my 12v campervan electrical system and draw up a wiring diagram which I can post for critiquing by those of you MUCH more experienced than I, ensuring a safe design and optimal battery health and longevity.