OnTheFlyPDX
New Member
- Joined
- Jun 27, 2021
- Messages
- 18
I just asked a complicated version of this in the beginners section before realizing this is probably a better place to ask. I’ll try to simplify. We have a 18’ travel trailer that currently has a 200ah 12v AGM on the trailer tongue. I’m building a 8s 200ah 24v lifepo4 battery bank with JBM/Overkill smart BMS. Looking to install ~600w of solar panels as well. Battery and PV will be connected to a MPP PIP-2724LV-MR (https://usamppsolar.com/product/top-pants-upper/). For simplicity, I don’t want to wire the MPP unit into the trailer’s circuit panel. I also don’t want to directly wire the 24v lifepo4 battery into the trailer’s 12v DC system (I know I’d need a 24v-12v converter to do that anyway). Instead, I’d like to keep the 12v AGM battery running the DC system separately and plug the trailer’s 30 amp shore power plug (the pig tail) into the MPP’s inverter. Here are my questions:
Will this work, like I think it will, to power the trailer as if it was connected to shore power? Am I missing something?
When running the whole trailer off the inverter, do I need to turn off the circuit breaker for the trailer’s built in battery charger? It will be charging only the AGM battery on the tongue, so there isn’t the issue of a power loop drain that people on here have warned about when a single battery bank -> inverter -> RV’s shore power input -> rv’s built-in battery charger -> back to battery bank.
I’m also thinking about installing a disconnect switch on the AGM battery so I can avoid draining it while using the MPP-inverter for “shore power.” I need to double check this next time visit our storage lot, but I’m pretty sure the trailer’s DC system is fully functional while on shore power, even if there is no 12v battery hooked up. I think I can keep the AGM battery charged with the truck’s inverter while driving to our next location. Anything I’m missing here?
Hope I explained everything okay. Happy to clarify if not. Thanks in advance for any and all responses.
Will this work, like I think it will, to power the trailer as if it was connected to shore power? Am I missing something?
When running the whole trailer off the inverter, do I need to turn off the circuit breaker for the trailer’s built in battery charger? It will be charging only the AGM battery on the tongue, so there isn’t the issue of a power loop drain that people on here have warned about when a single battery bank -> inverter -> RV’s shore power input -> rv’s built-in battery charger -> back to battery bank.
I’m also thinking about installing a disconnect switch on the AGM battery so I can avoid draining it while using the MPP-inverter for “shore power.” I need to double check this next time visit our storage lot, but I’m pretty sure the trailer’s DC system is fully functional while on shore power, even if there is no 12v battery hooked up. I think I can keep the AGM battery charged with the truck’s inverter while driving to our next location. Anything I’m missing here?
Hope I explained everything okay. Happy to clarify if not. Thanks in advance for any and all responses.