[blackdog]

We think the inverter back-fed a short across terminals. The Lexan panels guarding the batteries from persons became molten and began burning. The subsequent fire of the lead-acid batteries came from the acid boiled out or drained out of the casings from the Lexan fire.

MCC rooms are not usually attended but the system data captured remotely supported that conclusion.

The replacement setup now has a cage barrier instead of 100 linear feet of Lexan panels attached to the battery support frames.

There was some focus on overhead cable trays dead shorting and melting insulation down onto the Lexan to catch fire, but either or took place.

[ProtectOurFreedom]

Thanks. I thought Lexan panels were fire retardant and self-extinguishing. Maybe some other thermoplastic?