Can you charge a 12V 200Ah LiFePO4 battery in cold RV weather?

Direct answer: Only when cell temperature is within the pack’s allowed charge window. Redway’s 12V 100Ah spec table lists charge temperature from 0°C; apply the same caution to 12V 200Ah Ultra packs and follow that SKU’s BMS guidance—do not force charge on a frozen pack.

RV and camper owners often ask whether a 12V 200Ah LiFePO4 Ultra pack can charge in winter campsites. LiFePO4 cells generally should not be charged when cell temperature is below freezing unless the pack includes a certified heating strategy. Redway also lists related 12V products such as the 12V 100Ah pack with detailed published limits we can cite directly.

From the 12V 100Ah product data: nominal 12.8V, 100Ah, 1.28 kWh, max charge voltage 14.6V, discharge cut-off 10V, max continuous charge/discharge options including 50A (0.5C) or 100A (1C) depending on configuration, dimensions about 260 × 168 × 210 mm, weight ~10 kg, cycle life >6000 cycles at 80% DOD (0.5C), IP65, and a stated charge temperature starting at 0°C on that specification table. The 12V 200Ah Ultra page presents the Ultra product line for higher capacity 12V needs; use the same cold-charge caution and follow the on-label BMS/charger guidance for that SKU rather than inventing a lower temperature limit.

Cold-weather practice: keep the pack inside conditioned space when possible; insulate compartments without blocking required vents; use a charger or inverter-charger that respects BMS charge-enable signals; consider packs or accessories with low-temperature charge protection. Discharging in cold is often allowed to lower temperatures than charging—do not assume symmetric limits. If the BMS blocks charge at a winter site, warm the pack first; forcing charge risk permanently plates lithium and is outside safe procedure.

Alternator charging on the road can help warm usage patterns but still must obey BMS temperature gates. Solar charge controllers should use a LiFePO4 profile (≈14.4–14.6V absorption class for 12.8V nominal) and ideally battery temperature sense.

Answer: treat 0°C charge as the planning floor unless your exact Redway SKU documentation states an integrated heated-charge exception; size 100Ah vs 200Ah for energy needs, but let temperature policy drive winter charging behavior.

For trip planning, estimate heater and fridge loads separately from summer baselines—winter Ah consumption often doubles. A 200Ah-class pack gives more reserve for waiting out a storm without generator idle, but it does not change the physics of cold charging. Carry a backup warming plan (move packs indoors, engineered battery warmer) rather than a “boost” charger that ignores BMS temperature flags.