victron phoenix + smart charger = ghetto orion dc charger?

[shane0]

I already own a victron pheonix 375 inverter + a victron ip67 25a 120v charger + using a 100ah battleborn in a box that has breakers/fuses/etc.

I know it's silly to do but I'm only using this occasionally glamping and practicing becoming a nomad right now

my brief calculation is I'd be pulling around 300w 25a losing 15% efficiency it's only 2% less efficient than an orion?

am I right that this would work or is there something I'm overlooking or any huge reasons I should not do that?

another scenario, is there any reason I shouldn't use the ip67 in power supply mode going straight off the car battery or alternator? car has an 80ah agm

 

[sunshine_eggo]

I already own a victron pheonix 375 inverter + a victron ip67 25a 120v charger + using a 100ah battleborn in a box that has breakers/fuses/etc.

I know it's silly to do but I'm only using this occasionally glamping and practicing becoming a nomad right now

my brief calculation is I'd be pulling around 300w 25a losing 15% efficiency it's only 2% less efficient than an orion?

am I right that this would work or is there something I'm overlooking or any huge reasons I should not do that?

Not at all clear what you intend.

another scenario, is there any reason I shouldn't use the ip67 in power supply mode going straight off the car battery or alternator? car has an 80ah agm

The IP67 is a 120VAC charger, so how do you propose powering it with 12VDC?

 

[soylentgreen]

I assume the OP is talking about something like this:
Car Alternator (12V DC) --> Victron Phoenix Inverter (375 W 120V AC) -> Victron Ip67 charger (12VDC) -> Battleborn battery

I believe this setup would work. The main downsides are
* it would be less efficient since you are going 12V DC -> 120V AC -> 12V DC
* you'd have to do a lot of wiring changes to use it, since normally the inverter would be connected to the house battery

 

[sunshine_eggo]

Don't like it, but it should work fine. 70-75% efficient.

 

[shane0]

k, thx, I'll try this next summer

re: wiring I'm using sb50 connectors, battery is in a kickass brand power box, portable so I can use it in the tent, or switch vehicles

re: efficiency yeah I figured it wouldn't be efficient but I don't think my alternators will care, manuals say:

orion dcdc efficiency is 87%

phoenix inverter is 89% + ip67 charger is 95%

 

[sunshine_eggo]

k, thx, I'll try this next summer

re: wiring I'm using sb50 connectors, battery is in a kickass brand power box, portable so I can use it in the tent, or switch vehicles

re: efficiency yeah I figured it wouldn't be efficient but I don't think my alternators will care, manuals say:

orion dcdc efficiency is 87%

phoenix inverter is 89% + ip67 charger is 95%

Efficiencies are misleading.

Your Phx inverter is only 89% efficient at 30% rated. Above that, it's a slow taper off until max rated power is achieved, probably somewhere around 80%. Below 30%, it can be a shit show - particularly at low %. I have 2X Quattro 48/5000, and they run at about 50% efficiency because I'm only using about 180W (includes self-consumption) vs. the 10kW rated.

The charger efficiency is also misleading.

Trust me when I say that DC to AC to DC is going to net you 70-75% efficiency.

 

[shane0]

not doubting I just had the specs open at the time, black friday makes me want to finish the build this year but I should wait till next

too many options, I like victrons integrated monitoring, but the solar/dc combos like redarc & ctek look nice too, I wanted the victron sun inverter, it's got a solar charger built in but couldn't find one