Key Largo Wastewater Treatment District Board of Commissioners Meeting Agenda Item Summary

Size: px

Start display at page:

Download "Key Largo Wastewater Treatment District Board of Commissioners Meeting Agenda Item Summary"

Muriel Louisa Mitchell
5 years ago
Views:

1 Key Largo Wastewater Treatment District Board of Commissioners Meeting Agenda Item Summary Meeting Date: Agenda Item Number: L-1 June 5, 2018 Agenda Item Type: Agenda Item Scope: Recommended Action: Information I Presentation Review / Discussion Discussion Department: Engineering Sponsor: Ed Castle Subject: Photovoltaic Arrays Proposal Summary of Discussion: A request for proposals was published for installing a shade cover over the disinfection basin using solar panels. An additive alternate for installing solar panels on the roof of the operations building was included in the RFP. Only one bid was received, from SALT, a local company headquartered in Marathon. Weiler Engineering has been working with SALT since the proposal was received in mid-march to explore cost-savings options, finding several cost-saving opportunities. Reviewed I Approved Operations: Administration : Finance: District Counsel: District Clerk: Engineering: Financial Impact $ 207, Expense Funding Source: Grant(s) Budgeted: Partially Attachments 1. Memo from WEC outlining costs and benefits 2. Value-engineered cost proposal from SALT 3. Isometric drawings of CCC cover 4. Sunpower brochure General Manager S--3/-IV 81

6805 OVERSEAS HIGHWAY MARATHON FL 33050 TEL (305) 289-4161 FAX(305) 289-4162 MEMORANDUM To: KLWTD Board From: Ed Castle, PE Date: May 30, 2018 Re: Photovoltaic Array Proposal Update The FY18 Capital

2 6805 OVERSEAS HIGHWAY MARATHON FL TEL (305) FAX(305) MEMORANDUM To: KLWTD Board From: Ed Castle, PE Date: May 30, 2018 Re: Photovoltaic Array Proposal Update The FY18 Capital Projects budget includes funding for covering the disinfection basins to provide protection from the sun using solar panels. A Request for Proposals (RFP) was published, with proposals due March 22, A single proposal was received from SALT, a local company based in Marathon. As previous presented to the Board, providing shade over the disinfection basins using solar panels has a number of benefits, including: Reduction in sodium hypochlorite consumption by preventing UV breakdown of hypochlorite to oxygen and chlorides. Reduction UV degradation of plastics and other materials on top of the disinfection basin, including two autosamplers, PVC conduit, hoses, etc. Limits growth of algae, reducing labor for cleaning and use of shock treatments of sodium hypochlorite. Produces electricity to offset normal operating costs. While the RFP was still active, a decision was made to allow for an additive alternate in the hope that economy of scale might make the project more attractive. The additive alternate is to install a solar array on the roof of the Operations Building. While this array would not reduce chemical costs, it would generate electricity, and due to lower height requirements, the framework would be less expensive to construct. The proposal from Salt provided for four options for covering the disinfection basin and 4 options for the solar array on the operations building roof, using foreign-made versus domestic solar panels, and with minimum and maximum coverage areas. Our analysis of the options indicates that the lower output of the foreign-made panels made that option less attractive due to the relatively high cost of the framework and electrical work. Similarly, the smaller coverage area option has lower output, again making that option less attractive. Staff is recommending that the domestic solar panels 82

3 be used in the configurations that maximize output. This will maximize the energy output and result in a shorter payback period. WEC has been working with SALT to explore opportunities to lower costs and improve efficiencies. We have been able to reduce costs, as shown in the table below. Solar Option Description Original Bid Price Value- Engineered Price Savings Solar Cover over Disinfection Basins $290,217 $207,300 $82,917 Solar Array on Operations Building Roof $207,293 $164,700 $42,593 Both Solar Arrays $497,510 $372,000 $125,510 We received the final value-engineered pricing and energy output rates on May 30 th, a bit too late to perform a full evaluation including energy and chemical cost savings and payback periods. The results of those evaluation will be presented at the second meeting in June, at which time the item will be brought back for action. Value Engineering Changes: Construct framework from aluminum rather than stainless steel Use larger domestic-made commercial-grade solar panels with a lower purchase and installation price (with just slightly lower output, but still 25-year warranty) Recommended an alternative manufacturer for the aluminum framework Recommended that SALT use a subcontractor already working at Key Largo for installation of framework and other miscellaneous work 83

4 Key Largo Wastewater Treatment District Photovoltaic Array Project Bid Response Form (Revised in Addendum No. 2) Item A+B SP P17 Base Bid Item Description Unit Qty No kwp 1 Mobilization LS 1 $ 6,000 2 Bonds and Insurance LS 1 $ 7,600 3 Provide and install PV Array Framework for CCCs LS 1 $ 112,500 4 Provide PV modules for CCCs (without sales tax, ODP) LS 1 $ 36,500 5 Install PV modules for CCCs LS 1 $ 27,700 6 Provide and install Power Conditioning System for CCCs (Inverter) LS 1 $ 9,500 7 Connection to KLWTD power grid LS 1 $ 5,000 8 Integration into KLWTD SCADA system LS 1 $ Annual Service Contract YR 2 $ 2,000 TOTAL BASE BID AMOUNT $ 207,300 Item No. Additive Alternate Bid Item Description to Provide PV Array for Operations Building Roof Unit Qty A+B SP P kwp 1A Increase in Mobilization (if any) LS 1 $ 3,300 2A Increase in Bonds and Insurance LS 1 $ 4,800 3A Provide and install PV Array Framework for Operations Bldg Roof LS 1 $ 16,500 4A Provide PV modules for Operations Bldg Roof (without sales tax, ODP) LS 1 $ 71,600 5A Install PV modules for Operations Bldg Roof LS 1 $ 42,800 6A Increase size of Power Cond.Sys. to accept add. power (Inverter) LS 1 $ 17,300 7A Increase in connection to KLWTD power grid LS 1 $ 7,700 8A Increase in integration into KLWTD SCADA system (if any) LS 1 $ 200 9A Increase in annual service contract YR 2 $ 500 TOTAL ADDITIVE ALTERNATE BID AMOUNT $ 164,700 Item No. Deductive Bid Item Description for Allowing Use of Existing Electical Components Unit Qty 1D Use of Water Champ Conduit and Conductors LS 1 $ 4,900 2D Use of Water Champ Main Breakers in MCC2 LS 1 $ 500 TOTAL CREDIT FOR USE OF EXISTING ELECTRICAL COMPONENTS BID AMOUNT $ 5,400 84

5 85 ISOMETRIC VIEW ~ CERTli=IED <FABRiCfJOR ~- -.ilr-"'9 ml""' U"".. *~,..._ n.- "'"-I/.,.._. dro.. I 11'1 r-.a.1111'1' al Uw.... 1~~ i~~ 4U S. W. 54 Court OCALA FLORIDA PH.# (352) _., MAGNOLIA S1REET KEY LARGO Fl.. JS.:!0!50000 SOlAR SHADE SUPPORT CONCEPT SAl.TENERGY 5 - E1 Dixie Metal Products, Inc. KEY LARGO WASTEWATER TREATMENT OtSTRICT ~ I DELIVERED I ERECTED.,t.h lebrk.ollon 1ll\cl0.llr tloftlm O'ld 1\0llJlfle'dapfll'OWll*'"""'t1. '""''" MILLFINISH I I I... U...-noclrcum.toncft....,. _ pai' lal-la-poi'lal tm.. IOlbrn!llN. ~.ctlon and Map 111.,.,.,... M t..6n.cltot.hls fobrloitlll' IU.ln1 4 cal...dordo,.10 lll... r prop«~..:mduls. rnw' 1hi.dra-"'qma1-,...,.tt..at1Qlnal..,..._ NI «ecllanafmol.oal--antlli.dra.ir.g. ::;=.~::::=.:::::::.:::~ :.~:: ::.:" Gen eral Not es:

SunPower Performance Series Series 1500 1500 Volt Volt P17 P17 SunPower Performance Series 1500 Volt panels are designed to deliver consistent performance for many decades in advanced 1500 Volt power

6 SunPower Performance Series Series Volt Volt P17 P17 SunPower Performance Series 1500 Volt panels are designed to deliver consistent performance for many decades in advanced 1500 Volt power plant applications. High Performance & Excellent Reliability P 17 Increased Energy Production The Performance Series modules' linear shading response enables true-tracking in single-axis tracking systems, generating more energy than conventional systems that require backtracking. 1 Design Tip: When modeling P-Series energy performance be sure to use linear shading losses. For more detailed guidance please visit Higher Efficiency The Performance Series design minimizes white space between solar cells, eliminates reflective metal lines on the cells, and lowers electrical resistance between cells, increasing efficiency compared to Conventional Commercial Panels. 2 Optimized for the Oasis Power Plant From the mounting hardware, to the electrical design within the panel, to the connectors and the 1500 V rating, everything is designed as an integral part of the Oasis Power Plant. High Reliability Innovative panel design uses flexible and redundant electrical connections between solar cells to deliver enhanced reliability. SunPower Quality Tested to SunPower s rigorous quality standards, and backed by the industry s best Combined Power and Product Warranty. 25 Year Combined Warranty Protect your investment SunPower P-Series Conventional Panels 0 Product Warranty Length Years SunPower provides the best 25 year Combined Power and Product warranty in the industry, providing coverage regardless of product defect or power loss. 100 % 95 % 90 % 85 % 80 % SPR-P COM 75 % SunPower P-Series Power Warranty Length Conventional Step Warranty SunPower s Performance Series is warranted to produce more than 97% power in the first year, then declining by 0.6% per year, ending at 82.6% power after 25 years. Datasheet 86

7 SunPower Performance Series 1500 Volt P17 Electrical Data, STC 3 Model SPR-P COM SPR-P COM SPR-P COM SPR-P COM SPR-P COM Nominal Power (Pnom) 355 W 350 W 345 W 340 W 335 W Power Tolerance +5/ 0% +5/ 0% +5/ 0% +5/ 0% +5/ 0% Efficiency 17.2% 17.0% 16.7% 16.5% 16.2% Rated Voltage (Vmpp) 43.4 V 43.1 V 42.8 V 42.5 V 42.2 V Rated Current (Impp) 8.18 A 8.12 A 8.06 A 8.00 A 7.94 A Open-Circuit Voltage (Voc) 51.9 V 51.7 V 51.5 V 51.3 V 51.1 V Short-Circuit Current (Isc) 8.68 A 8.65 A 8.57 A 8.52 A 8.51 A Power Temp. Coef. 0.37% / C Voltage Temp. Coef mv / C mv / C mv / C mv / C mv / C Current Temp. Coef. 3.6 ma / C Maximum System Voltage 1500 V UL & 1500 V IEC Maximum Series Fuse 15 A Operating Condition And Mechanical Data Temperature 40 F to +185 F ( 40 C to +85 C) Impact Resistance 1 inch (25 mm) diameter hail at 52 mph (23 m/s) Appearance Class B Solar Cells Multicrystalline cells Tempered Glass High-transmission tempered anti-reflective Junction Box IP-65, 23.6 in (600 mm) cables / MC4 compatible Weight 51 lbs (23.1 kg) Max. Load Wind: 50 psf, 2400 Pa, 245 kg/m² front & back Snow: 112 psf, 5400 Pa, 550 kg/m² front Frame Class 2 silver anodized; stacking pins Tests And Certifications UL1703 (Type 2 Fire Rating), IEC 61215, IEC Standard Tests Rated to 1500 V Quality Certs ISO 9001:2008, ISO 14001:2004 EHS Compliance OHSAS 18001:2007, PV Cycle Ammonia Test IEC Desert Test /PVSC Salt Spray Test IEC (maximum severity) PID Test Potential-Induced Degradation free: 1500 V Available Listings UL, CEC, TUV, FSEC REFERENCES: 1 Independent Shade Study by CFV Laboratory. 2 Compared to a Conventional Commercial Panel (310 W, 16% efficient, approx m²). 3 Measured at Standard Test Conditions (STC): irradiance of 1000 W/m², AM 1.5, and cell temperature 25 C. 4 Type 2 fire rating per UL1703:2013, Class C fire rating per UL1703:2002 and IEC mm [39.3 in] (A) 2067 mm [81.4 in] (A) CABLE LENGTH: 600 mm +20/-10 mm [23.6 in +0.8/- 0.4 in] (B) STACKING PINS (C) LONG SIDE: 32 mm [1.3 in] SHORT SIDE: 22 mm [0.9 in] (A) 4X 398 mm (B) [15.7 in] 46 mm [1.8 in] 46 mm [1.8 in] FRAME PROFILE (C) Read safety and installation instructions before using this product. sunpower.com Document # Rev D /LTR_US December 2016 SunPower Corporation. All rights reserved. SUNPOWER and the SUNPOWER logo 87are registered trademarks of SunPower Corporation in the U.S. and other countries. Specifications included in this datasheet are subject to change without notice.

X-SERIES SOLAR PANELS

[Type text] X-SERIES SOLAR PANELS UNMATCHED PERFORMANCE, RELIABILITY & AESTHETICS 21.5% efficiency Ideal for roofs where space is at a premium or where future expansion might be needed. Maximum performance