Good for bulk battery storage.
This is the second batch of 4 300Ahr batteries I've purchased from PowerQueen, so that really says it all. I place 4 of these on a Harbor Freight 1200 lb capacity utility flat cart and remove the sides for easy movement about the house. I do have two all-in-one solar power charger battery units from two different manufacturers but the PowerQueens are the back up extra power. I actually like having separate components for these , i.e, a watt meter, inverter and MPPT charge controller for the solar panels which are portable but can connect to the batteries which remain inside the house. My PowerQueens are connected in parallel to 12V - 120 AC inverters so all I have to do is plug the refrigerator, window AC unit, security system etc using the standard 120ACV plug for the long power draws. The short distance for connections to my inverter does not make the 48V series configuration with smaller gauge wires much of an advantage. Plus the battery charges can balance against each other in the parallel configuration. Things I liked on these batteries were the terminals were both on one end (the width), the terminal bolts have the option of inserting with a Philips screw driver or a rachet , the smooth surface tops, the plastic caps on the terminal screws- i.e., attention to detail, set up, and practical utility. I could power my big fridge for three days but I haven't yet connected my watt meter to determine the actual drawdown output yet, but the sensors I purchased separately indicate a solid 13.8 volts when fully charged.