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The batteries are what keep you going when there is no sun.  If you need to have power all the time (even during a rainy day), then you need to make sure you have enough battery capacity to keep you going.  This is not critical if you are simply powering a tv, and some lights.   However if you need to have power to cook on, or maybe to keep a fridge, or furnace going, then it becomes important that you don’t run out of power.

This section could be an entire book.  But I will keep it simple, and we will only talk about a few types of batteries

Here’s the summary:

LEAD-ACID is a tried-and-true technology that has been used in off grid energy systems for decades.  While they have a relatively shorter life span than lithium’s,  and are 2-3X as heavy, they are also 1/2 to 1/3 the price.  They are heavy and bulky, and depending on the type, may require regular maintenance.  Overall, they’re a great battery for off-grid and backup systems, but are too heavy for small portable systems.

LITHIUM is a lighter, more compact battery with a longer lifespan. They do have temperature limitations and are more expensive than their lead-acid counterparts.  But if weight is critical, then they are the only way to go.  Out of the two main types of lithium batteries( NMC and LiFePo4), NMC is much lighter.  For emergency backup power, or camping, the NMC is the best choice (because of its light weight).  However if you will be running a tiny home, or cabin full time off the grid, and are not as concerned about weight, LiFePo4 has a longer life, and is a more stable battery.

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