An RV house bank is sized from the loads, not from the bay: inverter, fridge, air conditioning and how many nights you spend off hook-ups decide the amp-hours.
Size from the load list
Write the loads down before comparing batteries.
Add up nightly amp-hours, decide how much of that you want to replace with solar, and keep a margin. Lithium lets you use most of the capacity, so the same usable energy needs fewer amp-hours than AGM.
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Lithium or AGM — and what changes
The chemistry changes the charging system, not just the battery.
Lithium drops weight, doubles usable capacity for the same footprint, and charges faster from the alternator. In exchange it needs a compatible charger, a DC-DC or lithium-aware alternator regulator, and a BMS you can monitor.
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Brands, price and buying
Compare usable amp-hours and warranty terms, not sticker price.
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RV battery questions
The questions that come before an order.
How many amp-hours does an RV house bank need?
Add your nightly loads in amp-hours, decide how much solar replaces them, and keep a margin. Lithium gives roughly twice the usable capacity of the same AGM rating, so the number you need is smaller.
Can I replace AGM batteries with lithium?
Yes, but the charging system has to follow: converter profile, solar controller profile, and either a DC-DC charger or a lithium-aware alternator regulator.
Will lithium charge from the alternator while driving?
Only through a DC-DC charger or a lithium-aware regulator. Direct alternator charging without one is what kills alternators on RV conversions.
Does cold weather damage an RV lithium battery?
Cold reduces available capacity but does not damage the cells. Charging below freezing does, unless the pack has a heater — some of ours do, and the BMS blocks charge when it is unsafe.
How do I store an RV battery over winter?
Charge to around half, disconnect the bank, and avoid leaving it discharged. Check the BMS log when you bring it back into service.
Send the load list
Fridge, inverter, air conditioning and nights off hook-up — we will size the bank and the solar.
