Originally Posted by capemiker2
New Basecamp owner here. Our TV is arriving just before Xmas, fingers crossed!
We are planning to install (2) 200ah lithium ion batteries in the pickup and charge from the pickup solar and alternator while underway.
My next quest is to find what will be the best way to transfer the amperage from my 200ah bank in the truck to the 200ah AFM bank on the TV.
After we've toasted the new AGM's I'll replace them with a proper charger and lithium ion.
Placing the (2) 200ah lithium ion batteries in the pickup provides 400AH at 12 (actually 13.6 or so) Volts DC.
The current capacity is more than 400 Amps, and the voltage drop of a 12V
circuit is significant. That is a lot of power, so the resistance of the connecting cable, circuit breaker, connections, etc. need to be as low as possible, i.e. use a larger cable gauge. For a 30 Amp circut 10 Gauge minimum, but I'd recommend a 8 Gauge cable with 40 Amp circuit breaker.
Where to connect to the Basecamp?
The next problem is the DC voltage difference between Lithium Ion Batteries and Lead Acid. (This also affects the charging from the tow vehicle electrical system)
You should use a DC to DC converter to boost voltage from the tow vehicle to charge the LIon batteries, and a DC to DC converter to drop the DC voltage from the LIon battery circuit to the Basecamp. Otherwise the tow vehicle will not properly charge, and when you connect Lithium Ion batteries to Lead Acid, the current inrush will blow the circuit breakers and you will cook (boil away) the Lead Acid battery electrolyte and quickly destroy the batteries.
The Base Camp Converter battery charger may be able to set for Lithium or Lead Acid, but if the Basecamp is plugged into shore power it may try to charge the Lithium Ion battery bank (and possibly blow fuses or circuit breakers).
What I would do:
1) Convert the Basecamp to Lithium Ion and put the LIon batteries in the Basecamp. (change the jumpers or replace the converter if needed)
2) Put the old Basecamp Lead Acid batteries in the truck (Optional for 3-b below))
3 -a) Get a Victron DC DC converter to join the Tow Vehicle to the Basecamp, or
3-b)use a 12V
to 120V AC inverter (2,000 Watt?) and plug the Basecamp shore power into the Truck Inverter when boondocking (will NOT work if the Basecamp can plug into Shore Power at the campsite, only for boondocking)
The cost for 3-a or 3-b is close, but you still won't be able to run Air Conditioner from the batteries.