Powerwall 3 Wall Bracket Anchoring Details for Wall-mounting or Ground-mounting on Approved Foundation

A3 - Required Wood Stud Quantity for Load Distribution

It is recommended that the below framing limitations, when exceeded, are reviewed by a structural designer or other qualified person acceptable to the Authority Having Jurisdiction (AHJ). This table has used ICC code prescribed loading and ASCE 7 calculations to approximate suitable stud height, size, and spacing limitations for common site criteria and construction techniques. The number of studs listed in the table for the associated stacking arrangement shall be attached to the wall with one of the following details. The bracket, if compatible with the wall framing, is a minimum requirement. If the stud spacing is not compatible, the channel strut detail shall be used. See the General Anchoring Notes section for more information. This table is intended to be used with the following details:

Wood Studs (spaced at 12 and 17 inches)
Channel Strut (Unistrut)

Table 1. Recommended Quantity of Wood Studs Required for Powerwall 3 and Expansion Unit(s) Stacking ³
Total Units		Seismic Design Category (SDC)²	Size and Maximum Spacing (in)
			SPF 2 x 4 at 24" o.c.²			SPF 2 x 4 at 16" o.c.²			SPF 2 x 6 at 24" o.c.²			SPF 2 x 6 at 16" o.c.²
			Maximum Height of Stud top of sill plate to bottom of double top plate (ft)
			8	9	10	8	9	10	8	9	10	8	9	10
			Maximum Wind Speed Exp C or Less (mph)¹
			115	100	-	140	125	110	155	140	125	180	170	155
Powerwall 3 with One Expansion or Two Expansions	2	A, B	2	2	-	2	2	2	2	2	2	2	2	2
	2	C	2	2	-	2	2	2	2	2	2	2	2	2
	2	D	2	2	-	2	2	3	2	2	2	2	2	2
	2	E²	3	3	-	3	3	3	2	2	2	2	2	2
Powerwall 3 with Two Expansions or Three Expansions	3	A, B	2	2	-	2	2	2	2	2	2	2	2	2
	3	C	2	2	-	2	2	2	2	2	2	2	2	2
	3	D	-	-	-	3	3	-	2	2	2	2	2	2
	3	E²	-	-	-	4	-	-	3	3	3	3	3	3
Powerwall 3 with Three Expansions	4	A, B	2	2	-	2	2	2	2	2	2	2	2	2
	4	C	2	2	-	2	2	2	2	2	2	2	2	2
	4	D	-	-	-	-	-	-	3	3	3	3	3	3
	4	E²	-	-	-	-	-	-	4	4	4	4	4	4

Notes:

Wind Exposure D is outside the scope of this table.
Douglas Fir-Larch (DF-L) Stud Grade sawn lumber was used for SDC E.
If the number of studs listed for a specific combination is not available, that specific combination of stacked units and studs is not recommended.

A4 - Powerwall 3 Wall Bracket Anchoring Details for Wall-mounting or Ground-mounting on Approved Foundation

Reference these anchoring details when mounting Powerwall 3 to the provided mounting bracket.


Wood Studs (spaced at 12 to 17 inches) If anchoring directly into wood studs, use at least four (one in each corner) ¼ inch wood screws with washers, of sufficient length for at least 2-½ inch embedment into the studs. Note See Channel Strut (Unistrut) for stud spacing greater than 17 inches, up to 24 inches. Note See Recommended Quantity of Wood Studs Required for Powerwall 3 and Expansion Unit(s) Stacking for design-specific limitations of Powerwall 3 bracket to wood stud attachments.
Wood Studs (spaced at 12 to 17 inches) If anchoring to blocking between wood studs, use minimum 2 x 4 in blocks, end-nailed into studs with two 16d (89 x 4 mm) nails or toe-nailed into studs with four 8d (64 x 3 mm) nails. Use at least four (one in each corner) ¼ inch wood screws with washers, of sufficient length for at least 2-½ inch embedment into the blocking. Note See Channel Strut (Unistrut) for stud spacing greater than 17 inches, up to 24 inches.

A5 - Powerwall 3 Wall Bracket Anchoring Details for Wall-mounting or Ground-mounting on Approved Foundation


Metal Studs (spaced at 12 to 17 inches) If anchoring directly to metal studs, studs must be minimum 18 gauge or 43 mil thickness (0.043 in). Use at least four (one in each corner) #14 (¼ inch) sheet metal screws with washers, of sufficient length to penetrate at least 3 threads beyond the stud. If backing is needed between the studs, the backing must be minimum 18 gauge. Attach backing to metal studs with 12 gauge 3x3 inch angle clip or Simpson SFC2.25 clips with two #10 sheet metal screws in each leg. Note See Channel Strut (Unistrut) for stud spacing greater than 17 inches, up to 24 inches. Note Equipment stacks REQUIRE 3 METAL STUDS. Stacks are limited to (2) units per stack up to SDC E. Channel Strut (Unistrut) is required when attaching to more than 2 studs.
Concrete Masonry Unit Wall Minimum strength must be 2000 PSI. Use at least four (one in each corner, in any available anchor slot) 3/8 inch concrete anchors of sufficient length for the embedment listed below. ESR 1056 for Simpson Titen HD 3/8-inch concrete anchor. Minimum 2-¾ inch (70 mm) embedment required ESR 3056 for Hilti KH-EZ 3/8-inch concrete anchor (for fully grouted CMU cells only). Minimum 1-5/8 inch (41.3 mm) embedment required Anchors shall not be installed within 12 inches (305 mm) of wall edges or 1-½ inches (38 mm) of masonry block edges. Note Fasteners shall not be installed in mortar joints.
Solid Concrete Wall Minimum strength must be 2500 PSI. Use at least four (one in each corner, in any available anchor slot) 3/8 inch concrete anchors of sufficient length for at least 2-½ inch embedment into the wall. ESR 2713 for Simpson Titen HD 3/8-inch concrete anchor ESR 3027 for Hilti KH-EZ 3/8-inch concrete anchor

A6 - Powerwall 3 Wall Bracket Anchoring Details for Wall-mounting or Ground-mounting on Approved Foundation

Brick Wall

(Double and Single Layer of Brick Masonry)

Minimum strength must be 2500 PSI.

Use at least four (one in each corner, in any available anchor slot) ¼ inch masonry anchors of sufficient length for the embedment listed below.

Kwik Conn 2 (No ESR). Minimum 1-¾ inch (44.5 mm) embedment required

Brick installation is only permitted in seismic design category A or B, and where ESR anchors are not required. Ground mount only.


Maximum Wind Speed	Mounting Location
145 mph	Within 10 ft (3048 mm) of wall edge
165 mph	Not within 10 ft (3048 mm) of wall edge

Note

Brick depth must be verified to be minimum 4" thick prior to mounting. Brick thickness of 4" or less is not permitted for brick-only attachments and other wall type attachments need to be investigated.

Note

Fasteners shall not be installed in mortar joints.

A7 - Powerwall 3 Wall Bracket Anchoring Details for Wall-mounting or Ground-mounting on Approved Foundation


Channel Strut (Unistrut) Struts must be minimum 12 gauge, and either 1-5/8 inch or 7/8 inch. If mounting on wood studs, attach each strut to at least two studs, using at least one ¼ inch wood screw with washer per stud, of sufficient length for at least 2-½ inch embedment into the studs. If mounting on metal studs, attach each strut to at least three studs, using at least one #14 (¼ inch) sheet metal screw with washer per stud, of sufficient length to penetrate at least 3 threads beyond the studs. Note For either wood or metal studs, these requirements are per Powerwall (e.g. two studs per Powerwall on wood studs, or three studs per Powerwall on metal studs). To attach the bracket to the struts, use at least four (one in each corner) 3/8 inch hex head screws with washers and strut nuts. Channel strut shall have a maximum unsupported span of 24 inches (610 mm) and shall not be cantilevered. Note See Recommended Quantity of Wood Studs Required for Powerwall 3 and Expansion Unit(s) Stacking for design-specific limitations of Powerwall 3 bracket to multiple studs.