ABB Disconnect Switch Accessories Taught Me the Real Cost of EV Charger Stations

Last April, I sat in my home office with three bids spread across two monitors and a customer on a video call asking the same question for the third time: How much is solar battery?

I didn't have a single number for her. That answer, I learned the hard way, depends on a bunch of things that have nothing to do with the battery itself.

Why I Put the ABB Brand on a Shortlist

I run procurement for a 40-person electrical contractor. We install solar arrays, EV charger stations, and battery storage for commercial clients. Our annual equipment budget is around $180,000. Since 2019, I've logged every order in a cost tracking system, partly so I can look back and see where I was naive and partly because I like spreadsheets.

This project started as six EV charger stations at a distribution center. The customer also wanted a 60 kW solar canopy and a 100 kWh battery bank to cut demand charges. The charger stations themselves were straightforward. The battery was the hard part (not that the charger stations were trivial—they came with their own metering and protection requirements).

The customer's insurer had concerns about lithium-ion storage. She asked whether we could use a non lithium battery instead. That is a reasonable question. It also turned out to be the most expensive question on the project.

The Quote That Wasn't as Cheap as It Looked

We invited ABB to quote alongside a distributor who built the system from private-label components. The ABB brand came with a reputation and a certain price tag. The distributor's package was 18% lower on the first page of the quote.

Granted, 18% is not nothing. Over a $140,000 equipment package, that is $25,200 in apparent savings. I almost sent a recommendation to our project manager based on that headline number.

Then I did what I should have done before typing the email: I went line by line through the disconnect switches.

Both bids included DC disconnects for the solar array. The difference showed up in the accessories. ABB's quote listed ABB disconnect switch accessories for every disconnect—rotary handles, auxiliary contacts, padlock provisions, terminal shrouds. The distributor's quote had a single line item (surprise, surprise): DC disconnect, qty 8. It didn't say what those disconnects came with.

I asked the distributor for a breakdown. That's when the quote started growing.

Here's something vendors won't tell you: a quote that says the word 'included' often means the bare switch, with zero accessories. The accessories are where they make up the margin. In this case, eight rotary handles, eight padlock hasps, a few auxiliary contacts for monitoring, and terminal shrouds added $4,850 to the distributor's quote. Not one dollar of that was labor.

The ABB quote included those items up front. That is the practical meaning of the ABB brand in electrical procurement: line-item transparency, not just a name.

Non Lithium Battery Isn't a Simple Replacement

Back to the customer's question: how much is solar battery? The short answer is: which chemistry?

The distributor proposed a non lithium battery bank using lead-carbon cells. It looked cheaper on paper. The ABB solution used lithium iron phosphate (LFP) cells integrated by ABB. The customer's insurer had scared her away from lithium, and I had to explain that not all lithium is the same.

The 'lithium is dangerous' thinking comes from an era when early cobalt-based chemistries were a bigger fire risk. LFP is a different cathode material and a different failure profile. That doesn't mean LFP is magic, but it is not the same battery that gave lithium a bad name in 2013.

For this project, the insurance concern pushed us to price both options. The non lithium battery quote was $38,000. The LFP quote was $46,500. That is an $8,500 gap—until you look at cycles.

The TCO Spreadsheet That Changed My Recommendation

I built a simple total cost of ownership model. The lead-carbon bank had a manufacturer's rating of 2,500 cycles at 50% depth of discharge. The LFP bank was rated 6,000 cycles at 80% depth of discharge. That changes everything.

If the customer needs 100 kWh of usable energy every night, a 100 kWh lead-carbon bank only delivers about 50 kWh before you damage the cells. You need a 200 kWh bank to get the same usable capacity. The non lithium option stops being the cheap option the moment you double it.

At 50% DoD over ten years, the non lithium bank would have to be replaced at least once. The ABB-based LFP system, meanwhile, was still within its cycle rating. So the real comparison was not $38,000 versus $46,500. It was roughly $76,000 for the non-lithium solution over ten years, versus $46,500 for the LFP system. And that doesn't count the extra racking, cabling, and installation labor for the larger lead-carbon footprint.

I have mixed feelings about paying a premium for the ABB brand. On one hand, the premium is real. On the other hand, the premium bought us something our old 'lowest bid wins' process never did: certainty. We knew every disconnect switch accessory was accounted for, the battery warranty was on paper, and the system was engineered as a system instead of assembled from parts.

What This Means for EV Charger Stations, Not Just Batteries

EV charger stations attract attention for their visible cost—the charger cabinet, the cable, the software. But the expensive mistakes are usually in the electrical distribution around them. Isolation switches, cable protection, CT cabinets, and yes, ABB disconnect switch accessories. These are the parts that get value-engineered out of a bid when someone tries to beat the price of an ABB solution.

We ended up going with the ABB package. Not because the ABB brand made the project more impressive, but because the TCO spreadsheet made it cheaper. The installation went smoothly. We were done two days ahead of schedule. That never happens when you are chasing a low quote with missing details.

So glad I checked the accessories before hitting send on that recommendation. We were one purchase order away from a $4,850 change order and a two-week delay—not to mention a customer who would have been right to never trust our procurement process again.

The cheapest battery isn't the cheapest battery. The lowest quote is just a starting point.

What I Tell Customers When They Ask How Much Is Solar Battery

If you ask me today, I'll tell you the question itself is incomplete. The right question is: how much usable energy do you need per cycle, and how many cycles do you need over the life of the project?

Don't hold me to these exact prices, but as of Q2 2024, a commercial LFP system was in the range of $450 to $550 per kilowatt-hour of installed capacity, while a lead-carbon non lithium battery could be $180 to $220 per kilowatt-hour. That makes the non lithium battery look like a bargain. Then you multiply by the cycle life and the usable depth of discharge, and the lead-carbon option usually loses.

That is not an argument against every non lithium battery. For small off-grid systems with shallow daily cycling, lead-acid or lead-carbon can still make sense. But for a commercial facility running EV charger stations and solar storage every day, the cost per cycle favors LFP.

Since that project, I've added a 12-point checklist to every bid review. The first four items are:

• Does the quote include accessories for every disconnect switch?
• Are the battery cycle ratings based on the actual depth of discharge we will run?
• Is the EV charger station bid complete with metering and protection?
• What is the total cost per usable cycle, not the cost per kilowatt-hour?

Five minutes of verification beats five days of correction. The cheap quote was not cheap. It was just slow at showing me the rest of the bill.