What size house battery does my RV need?
Add up daily consumption in Ah (or Wh) at 12 V, multiply by the days you want to go without charging, divide by the usable depth of discharge, and add a margin for cold and ageing. 80 Ah/day for 2 days on AGM at 50% with 20% margin ≈ 384 Ah.
Separate starting and house batteries
Keep the engine-starting battery isolated from the house bank (battery isolator, voltage-sensitive relay or DC-DC charger) so that living loads can never prevent the engine from starting.
Weight matters
RVs have payload limits. Usable energy per kilogram differs greatly between chemistries; compare datasheets with the weight comparison calculator rather than nominal amp-hours.
Lithium upgrades usually require a compatible charger profile and often a DC-DC charger from the alternator.
Check ventilation requirements for flooded batteries inside living spaces.
Real references in our catalogue
Listed because the manufacturer’s data matches this category (type or technology). Being listed does not mean the battery suits your system — check its datasheet.
Frequently asked questions
Can I just swap AGM for LiFePO4?
Not without checking the charging sources: converter, solar controller and alternator path must support the lithium charge profile, and the BMS limits must suit your loads.
Do 6 V golf-cart batteries make sense in an RV?
Two 6 V deep-cycle batteries in series make a 12 V bank. The decision depends on available space, weight and the capacity you need; compare their datasheets.