Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-16 Thread Ryan
Dan Not all MPPT controllers do this. We took great pains to stop this in the Classic. But even then there could be a wind turbine or something hooked direct that could cause this so I could see a possible need for it. Ryan -- Ryan Stankevitz Technical Support Manager MidNite Solar Inc.

Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-16 Thread Chris Mason
I want to understand the issue if you don't mind. Are you saying that an MPPT charge controller has no voltage limits? I would have presumed a CC would know that there is no batteries attached. From your email, you want a device that will measure the CC output voltage, and shut it down if it

Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-16 Thread Ryan
Chris Yes some charge controllers regulate pretty slow. So if the battery goes away on them they can skyrocket in voltage on there battery side before they can catch themselves. This may only be for 2-3 seconds or so but that is all it takes to send an inverter up in smoke. This is also the

Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-16 Thread Randy Brooks
Has anyone tried using a battery management system (BMS) like those used on electric vehicle battery banks? Here is an example: http://www.manzanitamicro.com/products?page=shop.product_detailsflypage=flypage.tplproduct_id=87category_id=22 Randy Brooks Brooks Solar, Inc. Solar Power for People

Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-16 Thread Jay Peltz
Hi Dan Can you tell us which CC? Thx Jay Peltz power Sent from my iPhone ___ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Change email address settings:

Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-16 Thread Dan Fink
Morningstar tristar MPPT60 Dan Fink, On Sat, Mar 16, 2013 at 9:27 AM, Jay Peltz j...@asis.com wrote: Hi Dan Can you tell us which CC? Thx Jay Peltz power Sent from my iPhone ___ List sponsored by Home Power magazine List Address:

[RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-15 Thread Dan Fink
This has been happening all too frequently here. We live in a big area of off grid homes, dozens of systems. Lost a customers Trace 2624 this morning; One L-16 in older 24v bank opened internally. PV array/MPPT control zorched inverter as soon as the sun came up. First indication of problems last

Re: [RE-wrenches] bad battery = system overvoltage = dead inverter

2013-03-15 Thread James Jefferson Jarvis
Hi Dan, You can do it! You are looking for a circuit called a crowbar. It is a SCR that turns on when a certain voltage is exceeded. Typically implemented with an SCR and a zener diode. The SCR, when turned on, shorts out the battery. And BAM you blow the big fuse in the battery bank or