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Scenario

Can 200 Ah of lithium run a residential fridge overnight?

No. 2 × LiTime 12V 100Ah LiFePO4 gives 2,048 Wh usable at a 20% reserve; these loads use 7,517 Wh a day and charging adds 0 Wh, so it lasts 6.5 hours of use against a 12-hour target calculated. Data updated .

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

Overnight = 12 hours with no charging. The fridge is counted at its running watts for every hour because no duty cycle is published for this load; a real fridge cycles, so this is the high side.

The setup

  • Battery: LiTime 12V 100Ah LiFePO4 × 2
  • Inverter: Victron Energy Phoenix Inverter 12/1200 VE.Direct 120V
  • Inverter on 24 h a day (as long as the longest-running AC load), efficiency 91% (maker's peak figure)

Daily loads

LoadRunning WQty × hoursBattery-side Wh/day
Residential refrigerator (AC)275 Wrange 150–400 W1 × 24 h7,253 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: 11 W maker spec × 24 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.

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 460Ah V2 Elite (heated) × 1: 5,888 Wh rated, lasts 15.0 hours of use
  2. Epoch 12V 100Ah Group 24 × 5: 6,400 Wh rated, lasts 16.3 hours of use
  3. Epoch 12V 300Ah Heated Bluetooth Group 31 × 2: 7,680 Wh rated, lasts 19.6 hours of use

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

Sources