Portland Tests BYD K9 All-Electric Passenger Bus: Quick Ride Page 2

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Just as with electric and hybrid cars, the buses have regenerative braking that can, with some lighter loads, essentially keep the friction brakes from doing much work -- greatly extending the intervals for replacing pads, which can be quite costly for buses.

The K9 is available with a solar roof, but the one that’s being tested by Portland does not have this option.

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Batteries have longer life, more stable chemistry, maker says

The battery chemistry itself is what continues to separate BYD from the rest of the industry. You won’t find any common lithium-ion or lithium-polymer cells here. Instead, the lithium-iron-phosphate (LFP) cells used in the bus offer greater longevity and more stability, the company claims--just as in the BYD electric cars that aren't available here.

The battery packs themselves, and the modules within, are assembled in California, using cells from China. Thus far, the Lancaster facility employs about 100, although the workforce could become several times larger with any major U.S. contract.

Although the company has made inroads in Mexico, so far BYD’s largest contract in the U.S. is with Stanford University, where there have been three all-electric buses in regular use since September, with an order for 12 more now in.

But the BYD buses have have already been proven elsewhere. This is BYD’s second electric bus design for sale, a model that’s been in service since 2005, and more than 2,000 of them have been placed into service, with more than 600 of those outside China (Brazil and India are among the markets).

What’s the cost? While we can’t say exactly, Phillip Woolen, the North American maintenance director for BYD, confirmed that a typical (diesel) U.S.-spec bus, of the type that Portland seeks, costs about $400,000. The BYD buses vary quite widely in cost, depending on build and contract, but run “more than 50 percent” higher than those conventional buses.

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Worthy of a federal grant?

To pay for that, TriMet has submitted a grant proposal to the Federal Transit Administration (FTA) for $5.63 million, and there’s about a $5.35 million local match, all going to purchase nine all-electric buses (not yet confirmed as BYD models) and install charging stations.

Federal transportation funding requires that buses have more than 60 percent domestic content, and BYD’s Woolen said that at Lancaster they can build the K9 with up to 80 percent as required.

Pedestrian safety is another concern here. With these buses making very little noise -- especially as they approach from the front -- will there be more danger to pedestrians?

BYD says it isn’t aware of any rise in pedestrian incidents associated with these buses in other places where they’ve in use, but says it’s working with concerned groups to make sure that the buses emit low-speed noises that pedestrians will be able to hear in noisy places.

BYD K9 All-Electric Bus, as tested in Portland OR

BYD K9 All-Electric Bus, as tested in Portland OR

Enlarge Photo
As for worries about end-of-use scenarios, BYD describes its iron-phosphate chemistry as non-toxic, and frequently uses the term ‘disposable’ for its battery, which we’re also curious about -- as a representative talked not about end of use but instead focused on describing all the ways that its cells and battery packs could be repurposed.

That’s because, after all, the cells are estimated to last 20 years and beyond--while a typical bus, through primary and secondary owners, is on the road for 12 to 15 years.

Claimed 20-year battery pack

Yes, one of the interesting (and potentially hard to believe) things about the battery pack is that BYD says it will last 12 years before it reaches 80-percent degradation--and 20 years before it’s at a 70-percent degradation in capacity, based on daily charging. After that, it could be useful for some years in various energy storage or grid-buffering needs.

While some of these numbers will have to stand up to the test of time, this is perhaps the best real-use test of BYD and its unique battery chemistry on these shores.

In anticipation of the next, better round of electric cars headed to these shores, we’ll be following up with TriMet to see if the bus--and perhaps more importantly, the battery--lives up to its company’s claims.


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