Solar Batteries
Batteries store solar energy for evenings and outages. The right choice balances upfront cost, lifespan and maintenance.
Main chemistries
- Lithium (often LFP): higher usable capacity, longer cycle life, low maintenance.
- Lead-acid (tubular): familiar and lower in upfront cost, with lower usable depth and regular upkeep.
What to compare
- Usable capacity and depth of discharge
- Cycle life and warranty terms
- Operating temperature range
- Battery management and safety features
- Compatibility with your inverter
Sizing
Use your appliance load and hours of backup. Our battery calculator shows the arithmetic.
Battery safety and placement
- Install in a ventilated, dry, shaded location away from direct heat
- Keep batteries away from flammable storage and living spaces where possible
- Use proper fusing, breakers and cable sizing for the battery current
- Prefer products with a certified battery management system and clear warranty terms
Replacement planning
Batteries age faster than panels, so budget for replacement during the life of the system. Ask for the rated cycles and what capacity remains at the end of warranty, then compare real cost per cycle rather than only the purchase amount.
Frequently asked questions
Do I need a battery with solar?
Not for on-grid use. Batteries are for backup or off-grid operation.
Is lithium safe?
Quality cells with a proper battery management system and installation are designed for safety; avoid unbranded units.