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I am hoping that if you are looking at this you have your hands on some Tesla 21700 cells.  If not, you can get 21700 cells from Queen Battery.  They are 4000 mah cells at 3.7 volts for 14.8 watt hours per cell.

This is a Fencepost Power Wall design.  The Cap fits over a chunk of  5″ plastic fencepost tube.  

The Bloc holds 50 21700 cells.  At 14.8 watt hours a cell, that is 740 watt hours.  Put 15 in series for a 60 volt 11.1 KWH Power Wall.  Double the cells with a “DoubleDangler” for a 22.2KWH Power Wall.   Attach any number of Blocs in series and the BALANCERS (Not Included) will move the power from the high voltage Blocs to the low voltage Blocs, 24/7 balancing the battery at the top, the middle the bottom….

Included is a Cap for a 5″ Fencepost tube with a voltage gauge.   The 32P1S BatteryBloc for 26800/26700 cells is included.  A screw on bottom cap is included.

Not included is the 5″ Fencepost.  You can get this at Lowes or Home Depot.  Figure about eleven inches for each parallel group.  You can sit these on a shelf either upright or flat.  You can hang them from the wall as well using Super Strut.

Cut the strut into 4″ lengths and bolt to the back top of the fencepost tube.  Attach a length of SuperStrut to the wall studs, and hang the Blocs from it.  Bolt the Blocs together in series.

Add the 21700 DoubleDanglers will increase the walls capacity, but not double the price as you only need one set of caps.  Add as many DoubleDanglers as you need!

Don’t miss this page for more info.

Weight 2 lbs
Dimensions 12 × 3 × 5 in


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