How is RV power distributed for charging?

deeuubee

Senior Member
Joined
Sep 25, 2020
Messages
100
Location
Adirondacks, NY
My 25G has a 30A service and a WFCO 8955 converter (55 amp charger).

I'm considering a WFCO Lithium replacement converter (it's only a 50 amp charger though).

Does the distribution panel limit the maximum charge current based on available current after all loads are totaled up?

Meaning:

After a weekend of dry camping, I need to recharge the batteries.
If I'm running the A/C's and some other stuff cleaning up; I'm around 28 amps now from shore power.
It doesn't leave much for charging before maxing out the service.

From the spec's, for charging, the converter draws about 6A @ 120VAC for max charging (14.6VDC @ 50A), but
I only have 2 amps left.

The 25G has load shedding, so it's supposed to cut off the water heater, one or both A/C's to keep it from over loading.
Does the battery charger have priority for max charging or only uses what's left?

I know it's kind of a really technical question, but it would help me decide if buying a separate charger for the batteries would be more practical. As mentioned in another post by [MENTION=37786]Heavysledz[/MENTION], plugging it into shore power separately might be better.

I'm putting in 554 Ah LiFEPO4 battery bank, so less than 50A charge would take more time than I want.
 
The WFCO panels don't have any smarts beyond circuit breakers. For that matter their chargers don't have much for smarts either.

I can't find any technical info on the 'load shedding' though I would think the charger/converter would have top priority. The 12V systems are critical, lights, controls, etc. If I had that rig I'd read the manual very carefully. Knowing exactly how it shuts things off sounds like very critical information.
 
My 25G has a 30A service and a WFCO 8955 converter (55 amp charger).
...
The 25G has load shedding, so it's supposed to cut off the water heater, one or both A/C's to keep it from over loading.
Does the battery charger have priority for max charging or only uses what's left?

From GD Parts Lookup it appears 25G uses Precision Circuits Midi-PCS
Momentum 2021 25G-Class > Electrical
MONITOR PANEL 30 AMP EMS MIDI-PCS - REF ID 361WHACMIC4.0K192 https://www.granddesignrv.com/owner-support/parts/detail/59643
TERMINAL BLOCK MINI PCS I/O MODULE https://www.granddesignrv.com/owner-support/parts/detail/58453

Looks as though it'd shed 4 loads
Midi Load Shed Order 361WH2ACMIC4.0K192 - Rev 2019-08-07.jpg
https://precisioncircuitsinc.com/product/midi-pcs/
http://www.precisioncircuitsinc.com...50-000-Power-Control-System-Midi-Manual-B.pdf

Momentum G-Class 30A
http://precisioncircuitsinc.com/wp-...-Midi-System-Wiring-Grand-Design-08-07-19.pdf

One Control on some models is handling load shedding.
 
Last edited:
Drives me crazy when people don't follow up, so...

I just wanted to say that I bought a separate 75A Charger, and thanks for the input.
 

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