A home battery system stores surplus solar power for later use. The solar battery extends the use of a photovoltaic system’s generated energy and will provide free, sustainable power even when the sun is not shining and the modules don’t produce energy.
Photovoltaic systems without a storage opportunity produce electricity to be used immediately. This is rarely effective, since solar energy is mainly generated during the day, when the power demand of most households is low. However, electricity demand increases significantly in the evening.
The difference between the Lead and lithium batteries
Battery storage systems for residential use are equipped either with lead-acid, lead-gel, or lithium batteries. Lead-acid batteries were used mostly in the past, amongst other things, as car batteries. Given their considerable advantages, lithium batteries are becoming increasingly accepted over lead-acid batteries. They have come to be regarded as the standard in photovoltaic in recent years. Lifetime: The expected lifetime of lithium batteries is around 15 years, whereas the maximum for lead batteries lies between 5 and 10 years.
Safety: Lead batteries must be housed in a ventilated room since they emit gases. This is not necessary with lithium-ion batteries.
Depth of discharge: Lithium-ion batteries discharge up to 100% of stored power. Lead-acid batteries, however, can normally only be discharged up to 50%, since deeper discharge reduces their overall lifespan.
System efficiency: The system efficiency of lithium-ion batteries can exceed 90%, where only approx. 70% is possible with lead batteries. Photovoltaic systems with lead batteries therefore have to be larger, leading to unnecessary extra costs.
Our advice: Choose a lithium battery to store electricity for solar power systems
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