[RE-wrenches] 600V Clamping on DC Lines

[drake.chamberlin at redwoodalliance.org]

Those devices were susceptible to catching fire. I saw a hole burned in 
a roof from one of them. It is a great idea however.

_Drake Chamberlin_

_Athens Electric LLC_

_Ohio Electrical Contractor's License 44810_

_NABCEP Certified PV Installation Professional_

On 2025-04-18 11:46, Glenn via RE-wrenches wrote:

> There was a company that sold a mlpe that went online with a single 
> module in a string, that when temps were low, would bypass the module 
> and prevent string overvoltage.
> I don't believe the company is in business any longer.
> We re powered a PV system that had been installed with them a couple 
> years ago. Most of the devices were charred failures.
> 
> -Glenn
> 
> On Apr 18, 2025 11:36, Travis Knipple via RE-wrenches 
> <re-wrenches at lists.re-wrenches.org> wrote:
> 
>> Has anyone encountered a system to use something like a Zener Circuit 
>> to clamp a string input at 600Voc?
>> I've encountered many systems which, after designing for 600Voc, end 
>> up with ~300-350Vmp, which is less than ideal on a long-distance run. 
>> Since Voc should be a rare situation at the 2% temp, it seems like it 
>> would be better to clamp the voltage in those situations, and design 
>> for optimum performance in normal operation.
>> --
>> 
>> Travis Knipple
>> Senior Engineer
>> Hudson Solar Solutions LLC
>> Rhinebeck, NY 12572
>> 518-539-8040 x408 | travis at hudsonsolarsolutions.com
>> 
>> PVIP# PV-111821-013612
> 
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