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Scenario

Can you run a 13,500 BTU RV air conditioner for 4 hours on lithium?

No. 2 × Epoch 12V 300Ah Heated Bluetooth Group 31 gives 6,144 Wh usable at a 20% reserve; these loads use 7,579 Wh a day and charging adds 0 Wh, so it lasts 3.2 hours of use against a 1-day (4 hours of use) target calculated. Data updated .

Open this setup in the planner to change any part, load or hour.

Four hours of compressor running at Champion's typical figure, through an inverter-charger, with no charging. Start-up surge is not checked against the inverter here.

The setup

  • Battery: Epoch 12V 300Ah Heated Bluetooth Group 31 × 2
  • Inverter: Victron Energy MultiPlus-II 12/3000/120-50
  • Inverter on 4 h a day (as long as the longest-running AC load), efficiency 93% (maker's peak figure)

Daily loads

LoadRunning WQty × hoursBattery-side Wh/day
RV air conditioner (13,500 BTU) (AC)1750 Wrange 1500–2000 W1 × 4 h7,527 Wh calculated

Every appliance figure we list: appliance wattage.

Typical running watts are the midpoint of the published range calculated; a load with no published duty cycle is counted at its running watts for every hour listed. Inverter idle draw: 13 W maker spec × 4 h.

Charging per day

Solar 0 Wh (panel W, capped by the controller, × peak sun hours × 0.75), alternator 0 Wh, shore 0 Wh calculated.

Compatibility checks

  • 12 V parts: works. Every part chosen is a 12 V part.
  • Batteries in parallel: works. Within the battery maker's stated parallel count.
  • Inverter vs BMS (continuous): works. At full rated power the inverter draw is under 80% of the bank's BMS continuous rating.
  • Inverter vs BMS (surge): works. The inverter's rated surge draw is within the bank's published BMS peak current.
  • Inverter-charger current: works. The inverter-charger's rated output is within the bank's published max charge current.

Smallest banks that pass every check

Same chargers, inverter and loads, trying each battery we list at up to its maker's stated parallel count (one battery where no count is stated). Ranked by bank size, smallest first; we don't rank by price or quality.

  1. Epoch 12V 300Ah Heated Bluetooth Group 31 × 3: 11,520 Wh rated, lasts 1.2 days
  2. Epoch 12V 460Ah V2 Elite (heated) × 2: 11,776 Wh rated, lasts 1.2 days
  3. LiTime 12V 320Ah Mini Bluetooth × 3: 12,288 Wh rated, lasts 1.3 days

How each check works: compatibility checks. Every formula: methodology.

Sources