We asked one customer to model cost savings for us. Note that we didn’t pay for this, and it was based on a real bid made in 2015.

Case Study - TrueString Inverters Save $ for Machine Shop

Contributed by | HiQ Solar

 

There are many wild claims of cost savings in PV. Customers tell us the TrueString™ inverter family saves them money, so we asked one to model this for us to explain why. Note that we didn’t pay for this, and it was based on a real bid made in 2015.

The system was a 360 kW ballasted system on a machine shop. It was 480V 3-phase, and used 1,140 Canadian Solar 315W PV modules. The comparison was of 38 TrueString inverters mounted at the PV array, along with the same system implemented with 12 competing 24 kW inverters mounted at the load center.

The result was a saving of over 7 ¢/W using the HiQ inverters. The analysis zeroed out the cost of the inverters themselves in order to show just the BOS benefits, and includes both material and labor. Many system costs, such as the racking and PV modules, were common to both implementations and are left out of the comparison graph shown below. The graph shows the cost categories that are impacted by inverter choice. It is obvious that the two designs are very different, with the HiQ array-mounted inverters incurring more AC electrical costs, while the 24 kW conventional alternative has more DC electrical cost. Overall the HiQ layout costs less.

In addition to the explicit BOS cost savings, the TrueString inverter has a number of other advantages not captured in the modeling. At 8 kW with two individual string inputs, the granularity is very different to large 3-phase string inverters such as the 24 kW discussed here. For example, arc detection of each string directly at the array rather than at distance with many strings in parallel is obviously safer. Harvest optimization and monitoring of each string individually is also beneficial, as is system layout where every string can be a different length.

More detail on cost comparisons of this system and two others can be found at http://www.hiqsolar.com/bos-savings.html

 

 


Comments (0)

This post does not have any comments. Be the first to leave a comment below.


Post A Comment

You must be logged in before you can post a comment. Login now.

Featured Product

GreenFasten™ solar panel roof mount hardware, watertight, USA made

GreenFasten™ solar panel roof mount hardware, watertight, USA made

The GreenFasten™ - GF1 system utilizes the patented watertight technology EcoFasten Solar® is known for. The flashing is fit with our EPDM rubber bushing and when used with a compatible EcoFasten Solar compression bracket (milled with countersink), a watertight seal is created, which protects the integrity of the roof. Requiring just a single fastener (lag bolt or self-drilling), GreenFasten provides the fastest install in the industry and will not void roofing manufacturer's warranties. Backed by IAPMO certification, GreenFasten delivers a mounting solution for all new or existing (retrofit) composition shingle roofs, and is the most cost-effective solution available. Like all of the solar roof mount solutions in our line of products, GreenFasten is made in the USA using recycled materials.