Off-grid changes the battery’s job description. A grid-tied system’s battery is an optimisation; an off-grid system’s battery is the supply — when it is empty, the lights go out. XD Battery’s off-grid offer draws on the lines the company documents for exactly this service: solar gel and deep-cycle blocks for cabin-scale systems, OPzV and OPzS 2V strings for power houses, and the solar energy storage series — including documented off-grid solar system work in the wider range — up to complete 51.2V storage.
The design variable that dominates off-grid is autonomy: the number of consecutive generation-poor days the bank must bridge. Cabins accept one to two days and a generator for the rest; clinics and telecom sites specify three to five and pay for the cells to prove it. Autonomy multiplies bank size directly, which is why off-grid quotes are built from a load audit and a winter solar figure — never from the summer brochure number. Send us the load list and the location; the bank, the array and the autonomy are designed together or not at all.
Off-grid architecture choices
- Cabin scale: 12V/24V gel or deep-cycle banks, generator as the second autonomy tier
- Home scale: 48V banks of blocks or 2V cells; 51.2V storage where inverter integration matters
- Power-house scale: OPzV/OPzS strings with attended or sealed discipline by site staffing
- Hybrid reality: almost every serious off-grid system pairs the bank with a generator — design the pair, not the bank alone
How many autonomy days should I buy?
Match it to consequence: a holiday cabin tolerates a dark evening; a vaccine fridge does not. We will model the cost per autonomy day so the trade is explicit.
Lead acid or lithium storage off-grid?
Both are in this manufacturer’s range — lead acid lines and the 51.2V storage series. The deciders are budget structure, temperature, staffing and replacement logistics at your site.