Included is a Cap for a 5″ Fencepost tube with a voltage gauge and an Active Balancer as shown. The 60P1S BatteryBloc for 18650 cells is included. A screw on bottom cap is included.
The Bloc holds 60 18650 cells. At 9 watt hours a cell, that is 540 watt hours. Put 15 in series for a 60 volt 8.1 KW Power Wall. Double the cells with a “DoubleDangler” for a 16.1 K Power Wall. An Active Balancer is attached to the cap, so a BMS is optional. Attach any number of Blocs in series and the balancers will move the power from the high voltage Blocs to the low voltage Blocs, 24/7 balancing the battery at the top, the middle and the bottom-
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.
Battery Hookup has some good buys on 18650 cells for power walls. Let pretend that for this wall you are using their 2600 mah cells for about $1.30. For this discussion I will assume they have 2500 mah at 3.6 nominal volts for 9 watt hours each.
Here is a back-of-the-envelope calculation of the costs for a 60 volt, 15S120P Power Wall making 16.1 KW.
(15) 18650 Power Wall Caps and Blocs $1020.
(15) 18650 DoubleDanglers for $510
(1,800) 18650 cells from BatteryHookup (plus delivery). $2150
Or 1800 3000mah cells from QB for $4194– for a 19.9kwh battery.- delivery included.
Fencepost tube: $100
Super Strut: $40.00
So that is $3820, round to $3900 for a 16.1kw repairable & rebuildable PowerWall with active balancing. ($242 a KWH)
Add more 18650 DoubleDanglers to increase the walls capacity.