I have decided to install my Charger 1 to the 4x4, in a manner that is still portable. As mentioned in other posts, I have a 375W Victron in the rear of the 4x4, powered from my Auxiliary battery. It will be removed, (4 screws and an Anderson plug) then replaced with the Charger 1. The C1 will be connected to the Aux Bat via the same source Anderson plug, powered from the Aux Bat. As it is only charged via an inbuilt 20A DC-DC and also powers my fridge I am lowering the output voltage of the C1 so that it does not rapidly deplete this battery when driving.
I did some test from my 100Ah LFP tonight at various voltages and on the AC70, AC180 and Elite 100V2.
Results next post…
Before posting the results I will note a few observations;
- The LFP was fully charged, but not under charge as an alternator install would be. Therefore, the voltage will be lower than real world.
- It will be obvious that as the Charger 1 set voltage increases, so does the load on the source supply in Amps and Watts. However, as the battery was static, it’s voltage decreased slightly and the higher the load, the bigger the decrease.
- Disclaimer - These results are my observations from the setup I used. In a recommended install, I would expect similar data and probably better with increased supply voltage. Use this data as a guide only and check your own install with a multimeter/power meter.
The reason for the innocuous 28 & 29V test, is for my 20A max DC-DC charge limit of the Aux Bat and was only performed on the Elite 100.
(All power stations were set to Standard Mode Charging to maximise input Watts.)
Regarding use, (This also applied when I used the Victron) how long, I charge a power station from the 4x4 via the Charger 1, will depend upon , intended driving time, SOC of the Aux Battery and SOC of the Bluetti on each occasion.
I have other charging mechanisms, i.e. Solar, petrol generator, my caravan RV battery bank, or a mix of, lol. 
(Note - A 100A 12VDC power meter was installed between the LFP battery and the Charger 1 to record V, A & W drawn from the battery.)
The reason for my process change -
- The Elite 100 v2 is now my off grid camping go to unit for its 1,800W inverter to power my caravan M/Wave oven. However, as the minimum charge Watts from grid or other AC sources is now 600W and my Victron vehicle mounted inverter is only 375W, the E100 can not be charged from the Victron.
- I can’t see the point of charging my AC70 (also carried on trips) from the Victron inverter (in Silent Mode), to then use it to charge the Elite 100, then recharge the AC70, possible twice due to capacity differences.
- Going back to basics, it is not efficient to use a battery source (alternator and auxiliary battery) to charge another battery via AC (AC70) to then charge another battery via its AC output (Elite 100) and then charge the AC70 again in the same manner. That is a lot of power inverting efficiency losses.
- It’s far more efficient to use the Charger 1, convert DC voltage to a higher voltage, to then charge either power station with DC current. Charger 1 will charge any of my power stations, battery to battery. Makes more sense.
As an aside, the Victron was installed before the Charger 1 became available and would charge either the AC180 or AC70 in Silent mode. The change in charging profile Bluetti implemented (upping Silent mode to 600W) makes this option redundant. My only saving grace was, that I did not expend money, in particular, for the Victron to charge power stations. I had it in a cupboard, along with the 100Ah LFP, to back up the house fridge in a grid out, prior to using Bluetti PSs to do this.