Solar Battery Size Calculator: What size battery do I need?
Generally, we recommend keeping to a system size that means your self-consumption ratio remains above 30%. Remember: The table above is a highly generalised,
And the power output of the solar panels will depend on how many peak sun hours your location receives. Which I'll explain in a moment. Generally, for a 200 watt solar panel, you need 12v 100Ah lithium or 12v 200Ah lead-acid battery. For your convenience, here's a chart with recommended battery sizes for a 200-watt solar panel in different states.
What size battery you need, will depend on the total power production of your solar panels. And the power output of the solar panels will depend on how many peak sun hours your location receives. Which I'll explain in a moment. Generally, for a 200 watt solar panel, you need 12v 100Ah lithium or 12v 200Ah lead-acid battery.
For a fixed panel, you would be looking at around $230, while the portable ones would cost about $430, while a sealed lead-acid battery would be around $130, with a lithium-ion battery priced at around $200. As demand for lithium-ion batteries grows, they are becoming cheaper.
A 200W solar panel will fully charge a 12v 100Ah battery from 100% depth of discharge in about 7.5 peak sun hours. How fast will a 200-watt solar panel charge a 12-volt battery? A 200-watt solar panel will take anywhere between 5-15 peak sun hours to charge fully charge a 12v battery. The difference will depend on the size and type of battery.
PDF version includes complete article with source references.
Get technical specifications, application guides, and ROI analysis tools for containerized microgrid solutions, mobile energy storage containers, and portable power systems.
15 Industrialna Street, Włochy District
Warsaw, Poland 02-492
Sales & General: +48 22 824 4067
Technical Support: +48 607 809 270
Monday - Friday: 8:00 AM - 6:00 PM CET
Saturday: 8:00 AM - 2:00 PM CET