LEMA LOG-0001-A User manual

LEMA Off-Grid
User Manual
Business Plan
Document Number: DM-003-A
WTS LLC
275 East 4th Street, Suite 720
Saint Paul, MN 55101
USA
www.lema.io
June 2021
DM
-
003
-
A
–
LEMA Off
-
Grid User
Manual

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 2
Table of Contents
Table of Contents 2
Figures 5
Document Revisions 8
Disclaimers 8
Trademarks and copyright 8
Customer support 8
Mail 8
1. Overview 9
2. Specifications 10
2.1 LEMA Off-Grid Solar Tracker 1.2KW 10
2.2 LEMA Off-Grid Electrical Enclosure 10
2.3 LEMA Off-Grid Pump Kit 10
3. System Components 11
3.1 Mechanical System 11
3.1.1 Mast 11
3.1.2 Goal Post 12
3.1.3 Yard 12
3.1.4 Hardware 12
3.2 Linear Motor Season 12
3.2.1 Hardware 13
3.3 Linear Motor Day 14
3.3.1 Hardware 14
3.4 Footing 15
3.4.1 Sonotube 16
3.4.2 PVC Tubing 16
3.4.3 Hardware 17
3.5 PV Racking 17
3.5.1 PV Racking Supports 18
3.5.2 PV (Solar) Panels 18
3.5.3 PV Disconnect Switch 19
Hardware 19
3.6 Solar Tracker Controller 19
3.6.1 Hardware 20
3.7 LEMA Off-Grid Electrical Enclosure 20
3.7.1 Batteries 22
3.7.2 Battery Cables 23
3.7.3 Lower Battery Mounts 24
3.7.4 Upper Battery Hold-Down Bolts 24
3.7.5 Inverter 25
3.7.6 Charge Controller 25
3.7.7 Controls System 26
3.7.8 Circuit Breakers 26
3.7.9 Hardware 28
3.8 Pump & Pump Float 28
3.8.1 Pump Float 28
3.8.2 Pump Cable 29
3.8.3 Pump Tubing 30

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 3
3.9 Pump Float Switch 30
3.10 Mechanical Structure & PV Racking Wire Kit 31
3.10.1 Hardware 31
3.11 Tool Kit & Spare Parts 32
3.11.1 Tool Kit 32
3.11.2 Spare Parts 33
3.11.3 Hardware 33
4. Packaging 34
4.1 Box 1 of 5 34
4.2 Box 2 of 5 35
4.3 Box 3 of 5 36
4.4 Box 4 of 5 36
4.5 Box 5 of 5 37
4.5.1 Box 5 of 5 – Lower Section 38
4.5.2 Box 5 of 5 – Upper Section 38
5. Installation Instructions 39
5.1 Overview 39
5.2 Layout 39
5.2.1 Major Component Layout 39
5.2.2 Solar Tracker Orientation 40
5.3 Footing Installation and Concrete Pour 40
5.3.1 Solar Tracker Footing 40
5.3.2 LEMA Off-Grid Electrical Enclosure Concrete Pad 42
5.3.3 Cable Trench in-between Solar Tracker and LEMA Off-Grid Electrical Enclosure 42
5.4 LEMA Off-Grid Electrical Enclosure, Mechanical System, Linear Motors, PV Racking, and Solar Tracker Controller 43
5.4.1 Setup LEMA Off-Grid Electrical Enclosure 43
5.4.2 Electrical Connections Between Solar Tracker and Base of LEMA Off-Grid Electrical Enclosure 44
5.4.3 Bury the 8' Copper Ground Rod 46
5.4.4 Route Wires Through the Mast and PVC Tubing 48
5.4.5 Mount the Mast 48
5.4.6 Mount the Goal Post 50
5.4.7 Attach the Linear Motor Season 50
5.4.8 Mount the Yard 51
5.4.9 Attach the Linear Motor Day 52
5.4.10 Attach the PV Racking Yard Supports 53
5.4.11 Attach the PV Racking Side Supports 55
5.4.12 Attach the PV Racking Center Supports 57
5.4.13 Attach the PV Disconnect Switch 59
5.4.14 Attach the PV Panels 59
5.4.15 Remove the PV Disconnect Switch Cover 64
5.4.16 Mount the Solar Tracker Controller 65
5.5 Wiring Solar Tracker Controller, Linear Motors, PV Panels, PV Disconnect Switch, Grounding/Bonding, and LEMA
Off-Grid Electrical Enclosure 66
5.5.1 Connect Electrical Cables on Solar Tracker Controller 66
5.5.2 Wire Copper Grounding Braid, Solar Track Controller, and PV Disconnect Switch 67
5.5.3 Wire PV Panels 72
5.6 Install the Batteries 76
5.7 Pump System 84
5.7.1 Pump & Pump Float 84

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 4
5.7.2 Pump Float Switch 86
5.8 Remove Nighthawk M1 Mobile Router Battery 87
6. Unit-Specific Checkout Sheet 88
7. Commissioning and Running 89
7.1 First Time Commissioning & Power-Up 89
7.2 Primary Operation of the Solar Tracker 89
7.2.1 Solar Tracker Automation Button Commands 90
7.2.2 Solar Tracker Photovoltaic Disconnect Switch 91
7.3 Primary Operation of the LEMA Electrical Enclosure 91
7.3.1 Toggling Outlet 1 and Outlet 2 via External Button 91
7.4 Check Battery Level via External Button 91
8. Software Versions 92
9. Connectivity 93
9.1 Network Topology 93
9.2 Addresses 94
9.3 WiFi Hot Spot 94
10. Home Assistant 96
10.1 Home Assistant Pages 96
10.2 Remote Connectivity via Nabu Casa Web Service 98
11. Electrical One-Line Diagram 100
12. Electrical Drawing 102

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 5
Figures
Figure 1-1 - LEMA Off-Grid System (Model: LOG-0001-A) 9
Figure 3-1 - Mechanical System 11
Figure 3-2 - Mast 11
Figure 3-3 - Goal Post 12
Figure 3-4 - Yard 12
Figure 3-5 - Linear Motor Season 13
Figure 3-6 - Linear Motor Day 14
Figure 3-7 - Footing 15
Figure 3-8 - Sonotube 16
Figure 3-9 - PVC Tubing 16
Figure 3-10 - PV Racking 17
Figure 3-11 - PV Racking Supports 18
Figure 3-12 - LG400 Solar Panels 19
Figure 3-13 - PV Disconnect Switch 19
Figure 3-14 - Solar Tracker Controller 20
Figure 3-15 - Solar Tracker Controller Diagram 20
Figure 3-16 - LEMA Off-Grid Electrical Enclosure 21
Figure 3-17 - LEMA Off-Grid Electrical Enclosure Internals 22
Figure 3-18 - 12v 100AH AGM Sealed Lead Acid Battery 23
Figure 3-19 - Upper Battery Cables 23
Figure 3-20 - Lower Battery Cables 24
Figure 3-21 - Lower Battery Mounts 24
Figure 3-22 - Upper Battery Hold-Down Bolts 25
Figure 3-23 - Victron Energy MultiPlus-II 25
Figure 3-24 - Victron Energy SmartSolar MPPT 150 26
Figure 3-25 - Electrical Controls System 26
Figure 3-26 - Main Circuit Breaker Bank 27
Figure 3-27 - Lower Circuit Breaker 28
Figure 3-28 - Pump Float 29
Figure 3-29 - Pump Cable 29
Figure 3-30 - Pump Tubing 30
Figure 3-31 - Pump Float Switch 30
Figure 3-32 - Mechanical Structure & PV Racking Wire Kit 31
Figure 3-33 - Tool Kit 32
Figure 3-34 - Spare Parts 33
Figure 4-1 - Packaged & Sealed LEMA Off-Grid Shipping Boxes 34
Figure 4-2 - Box 1 of 5 35
Figure 4-3 - Box 2 of 5 36
Figure 4-4 - Box 3 of 5 36
Figure 4-5 - Box 4 of 5 37
Figure 4-6 - Box 5 of 5 - Lower Section 38
Figure 4-7 - Box 5 of 5 – Upper Section 38
Figure 5-1 - Maximum Center-to-Center Distance between the Solar Tracker and LEMA Off-Grid Electrical Enclosure 39

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 6
Figure 5-2 - Footing Assembly 40
Figure 5-3 - Solar Tracker Footing Hole Dimensions 41
Figure 5-4 - Footing Orientation in hole/concrete 41
Figure 5-5 - Install PVC Tubing 42
Figure 5-6 - 5.3.2 LEMA Off-Grid Electrical Enclosure Concrete Pad Dimensions 42
Figure 5-7 - LEMA Off-Grid Electrical Enclosure Setup on Concrete Pad 43
Figure 5-8 - LEMA Off-Grid Electrical Enclosure Base Rear Cover Bolt Locations 44
Figure 5-9 - LEMA Off-Grid Electrical Enclosure Base Rear Cover Removed 44
Figure 5-10 - Cable Bundle Between Solar Tracker and LEMA Off-Grid Electrical Enclosure 45
Figure 5-11 - Electrical Connections in Base of LEMA Off-Grid Electrical Enclosure 46
Figure 5-12 - Solar Tracker Power and Data Cable Connector 46
Figure 5-13 - 8' Copper Ground Rod Location 47
Figure 5-14 - Installed 8' Copper Ground Rod 47
Figure 5-15 - Mast Mounted on Concrete 48
Figure 5-16 - Align Mast North & South 49
Figure 5-17 - Align the Lower Linear Motor Season Mounting Point North-South 49
Figure 5-18 - Goal Post mount on Mast 50
Figure 5-19 - Mounted Linear Motor Season 51
Figure 5-20 - Mounted Yard on Goal Post 52
Figure 5-21 - Mounted Linear Motor Day 53
Figure 5-22 - Pre-Assembly of the PV Racking Yard Support 54
Figure 5-23 - Post-Assembly of the PV Racking Yard Supports 54
Figure 5-24 - Pre-Assembly of the PV Racking Side Supports 55
Figure 5-25 - Post-Assembly of the PV Racking Side Supports 56
Figure 5-26 - Identification of the 3x unique PV Racking Center Support 57
Figure 5-27- Pre-Assembly of the PV Racking Center Supports 58
Figure 5-28 - Post-Assembly of the PV Racking Center Supports 58
Figure 5-29 - PV Disconnect Switch Location 59
Figure 5-30 - Pre & Post-Assembly of the PV Disconnect Switch 59
Figure 5-31 - PV Panel Orientation on the PV Racking 60
Figure 5-32 - Pre-Assembly of the PV Panels 61
Figure 5-33 - Post-Assembly of the PV Panels 61
Figure 5-34 - PV Panel Aluminum Grounding Lug Locations 62
Figure 5-35 - PV Panel Aluminum Grounding Lug Location (Right) 63
Figure 5-36 - PV Panel Aluminum Grounding Lug Location (Left) 63
Figure 5-37 - PV Disconnect Switch Cover Bolt Locations & Pre-Disassembly 64
Figure 5-38 - Post-Disassembly PV Disconnect Switch Cover 64
Figure 5-39 - Pre & Post-Assembly of the Solar Tracker Controller 65
Figure 5-40 - Orientation of the Solar Tracker Controller on the Goal Post 65
Figure 5-41 - Solar Tracker Controller Cables 66
Figure 5-42 - Day Axis Limit Switch Location & Routing Path 67
Figure 5-43 - Wire Routing along Mast and Goal Post 68
Figure 5-44 - Wire Routing along the Goal Post, Yard, and PV Racking 69
Figure 5-45 - Copper Braid Routing Locations 70
Figure 5-46 - Excess Copper Braid on PV Panel #1 70
Figure 5-47 - PV Disconnect Wire Routing 71

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 7
Figure 5-48 - Copper Ground Rod, 1/2" Ground Rod Clamp, Copper Braid, and Grounding Wire (Green) connection 71
Figure 5-49 - PV Panels Wired in Series (+144VDC) 72
Figure 5-50 - PV Panel #1 Wire Routing 72
Figure 5-51 - PV Panel #3 Wire Routing 73
Figure 5-52 - PV Panel #2 and PV Disconnect Switch Wire Routing 73
Figure 5-53 - Tighten Zip Ties & Remove Excess Zip Tie Material 74
Figure 5-54 - PV Disconnect Switch Cover Re-installed 74
Figure 5-55 - Completed Mechanical Structure Wiring (Orthogonal) 75
Figure 5-56 - Completed Mechanical Structure Wiring (Side) 75
Figure 5-57 - Four Batteries in Series 76
Figure 5-58 - Upper Circuit Breakers 77
Figure 5-59 - Lower Circuit Breaker 77
Figure 5-60 - Battery “BAT 102” Terminal Labels 78
Figure 5-61 - Secured Battery Cables and Upper Battery Mounts During Shipping 79
Figure 5-62 - Empty Battery Enclosure 79
Figure 5-63 - Insert the Bottom Plate 80
Figure 5-64 - Install Battery BAT 101 80
Figure 5-65 - Install Battery BAT 102 81
Figure 5-66 - Install Battery BAT 103 81
Figure 5-67 - Install Battery BAT 104 82
Figure 5-68 - Connection “101 [+] [8]” Battery Temperature Monitor 82
Figure 5-69 - Secure Top Batteries with the Upper Battery Hold-Down Bolts 83
Figure 5-70 - Pump Float and Pump Tubing connection locations 84
Figure 5-71 - Pump Float and Pump Cable connection locations 85
Figure 5-72 - Pump Cable and LEMA Off-Grid Electrical Enclosure connection locations 85
Figure 5-73 - Pump Float Switch connection location 86
Figure 5-74 - Plump Float Switch Connection on the LEMA Off-Grid Electrical Enclosure 86
Figure 9-1 - Netgear Nighthawk M1 Mobile Router 93
Figure 9-2 - Network Topology 94
Figure 10-1 - Home Assistant Login 96
Figure 10-2 - Main Power Switches and Batter Level 96
Figure 10-3 - Details Tab 97
Figure 10-4 - History Tab 97
Figure 10-5 - History Tab Continued 98

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 8
Document Revisions
Revision
Date
Description
A
June
20
2
1
Baseline release of the document.
Disclaimers
Information in this document is subject to change without notice and does not represent a commitment on the part of
WTS LLC. WTC provides this document “as is,” without warranty of any kind, expressed or implied, including, but not
limited to, the implied warranties of fitness or merchantability for a particular purpose. WTS may make improvements
and/or changes in this manual or in the product(s) and/or the program(s) described in this manual at any time.
This product is still in its prototyping phase – all information in this document is subject to change.
Trademarks and copyright
WTS LLC, and the LEMA logo are trademarks or registered trademarks in the United States and other countries
worldwide. All other trademarks mentioned in this document are the property of their respective owners.
© 2021 WTS LLC. All rights reserved.
Customer support
Telephone (8:00 am — 5:00 pm CST):
US & Canada: [phone]
Worldwide: [phone]
Online: www.lema.io/support
Mail
WTS LLC.
2327 Wycliff Street, Suite 250
Saint Paul, MN 55114
USA

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 9
1. Overview
LEMA Off-Grid is a solar electricity generation system which features dual axis solar tracker which can support three
78.46 in (1.993 m) x 37.8 in (0.961 m) photovoltaic cells yielding 1.2KW of solar energy production. The electrical
enclosure features 4KWh or 8KWh battery storage, charge controls and a 2KW inverter providing 230VAC electricity out
of two independently controllable outlets. The system ships with a .25HP pump kit which includes a float switch for
tanks, electrical cabling and hoses with a length of 300 feet. The system can be wirelessly controlled from a phone or
desktop pc and provides a high accuracy solar pointing vector for solar tracking.
This document contains information on how to setup and use the LEMA Off-Grid system.
Figure 1-1 - LEMA Off-Grid System (Model: LOG-0001-A)

LEMA Off-Grid User Manual (DM-003-A)
© 2021 LEMA - lema.io
Saint Paul, Minnesota, USA
Page | 10
2. Specifications
LEMA Off-Grid Model: LOG-0001-A
2.1 LEMA Off-Grid Solar Tracker 1.2KW
Size
LW (with panels
,
top down
projection
)
-
4.92 x 4.92 ft (1.5 x 1.5 m)
Solar Panel
Type
-
LG
400
405 Watts Bi
-
facial
Max Height
-
10 ft
(3.048 m)
Anchor
Plate
-
1ft
diameter
circle (.3048 m)
(see
drawing)
Weight
-
330.69 lbs (150 kg)
Tracking Angle Range Altitude (Season Axis)
-
35 degrees to 85 degrees (0 degrees = horizon)
Tracking Angle Range Along Ecliptic (Day Axis)
-
35 degrees to 135 degrees (90 degrees = zenith)
Tracking Accuracy
-
< 2 degrees
Tracker Power Supply
-
24 VDC
Power Consumption
-
30 watts peak, <5 watts average
2.2 LEMA Off-Grid Electrical Enclosure
Size LW
H
-
2
ft
x
3
ft
x 5 ft
(
0.6
0 m
x
0.91m x
1.5
2
m)
Enclosure
Weight
-
16
0
lbs (
72.5
7
kg
)
Battery Weight
-
4
x 60
lb
s
(
27.21 kg)
= 240 lbs (
108.86 kg)
Power Supply
-
None
Controls
Power Consumption
-
100
watts peak, <10 watts average
Output Voltage
-
1
Ø
at
230 VAC
50/60 Hz
Output Power
-
2
.0
KW
with 3
.0
KW
p
eak
power
Battery Type
-
Sealed Led Acid AGM
Battery
Voltage
-
4 x 12 VDC = 48 VDC
Battery Storage
-
4
x 100 AH @
12v
=
4.8 KWh
(4.0 KWh usable)
System Controller
-
Raspberry Pi 4 B+ 4GB RAM 32GB SD Card
, Linux 5.4
Communications
-
Netgear
Nigh
t
haw
k
M1 Mobile cell router with Wifi
Desktop Computer Requirements
-
Mac OSx,
Window 7/10, 2GHz CPU, 2GB RAM, USB
2.0
Mobile Operating System
-
Android / iOS
2.3 LEMA Off-Grid Pump Kit
Size L
en
gth, Diameter
-
2.5ft
T
all
(
0.76
m)
3.87
inches diameter
(
0.09
m)
Pump Model
-
Pentair Simmer
2850G
0.5 HP
Weight
-
27 l
bs (
12.24
kg
)
Cable Length
-
300 ft (
91.44 m)
Float switch
i
ncluded
-
Yes
Power
S
upply
-
1
Ø
at
230
VAC
50/60 Hz
Power Consumption
-
1
.1 KW average