[RE-wrenches] Generator automatic disconnect

Chris Mason cometenergysystems at gmail.com
Tue Oct 1 08:40:27 PDT 2013


Generac also makes a 20kw.

Chris Mason
Comet Systems
Anguilla (264) 235-5670
St. Kitts  (869) 662-5670
skype netconcepts

NABCEP Certified Solar PV Installer™
Renewable Energy Systems professional
Generac Generators Factory technician
On Oct 1, 2013 11:16 AM, "Ray Walters" <ray at solarray.com> wrote:

> Sounds like they need a 20 Kw Kohler. Hot Tub in the future?  They'll love
> their Kohler.  The Generac is just way too small to even consider IMHO.
>
> R.Ray Walters
> CTO, Solarray, Inc
> Nabcep Certified PV Installer,
> Licensed Master Electrician
> Solar Design Engineer
> 303 505-8760
>
> On 10/1/2013 8:11 AM, Larry Crutcher, Starlight Solar Power Systems wrote:
>
>> William, Chris, Ray, Allan, et al.
>>
>> Gen support would be ideal but this inverter setup will be a quad pack of
>> Magnum 4024PAE (120/240 split; 16kW). Their New MSH inverter is single
>> phase only and can not be stacked.
>>
>> While disabling load(s) is the antithesis of the desired outcome, I'll
>> review this possibility further.
>>
>> Using a separate charger could work but it would need to be about 200A @
>> 32V which would add quite a bit of cost and be hard to sell since the
>> Magnum inverters already have 4 high quality charges included.
>>
>> A larger generator might be necessary if the customer won't agree to load
>> shedding. Their plans are to expand the loads over time, operate a
>> business, install a hot tube and more. Of course I have pushed the concept
>> that conservation is paramount. The PV array and inverters are being
>> oversized now for the future growth.
>>
>> My ideal solution...Since Magnum inverters monitor the AC input and
>> control it based on quality of power, it seems to me that there could be a
>> setting for disconnecting the AC input if loads exceed a setpoint. Change
>> in control software would be great.
>>
>>
>> Thank you,
>> Larry
>>
>>
>>
>> On Sep 30, 2013, at 4:14 PM, William Miller <william at millersolar.com>
>> wrote:
>>
>> Larry:
>>
>> Maybe a better approach might be to use an inverter with "Gen-support."
>> That is unless a system already exists that does not have this feature.
>>
>> Plan B:  use the gen start signal to disable one or more of the larger
>> loads.
>>
>> I know this is not what you asked for, just trying inject some different
>> ideas.
>>
>> William
>> -----Original Message-----
>> From: re-wrenches-bounces at lists.re-**wrenches.org<re-wrenches-bounces at lists.re-wrenches.org>
>> [mailto:re-wrenches-bounces@**lists.re-wrenches.org<re-wrenches-bounces at lists.re-wrenches.org>]
>> On Behalf Of Larry
>> Crutcher, Starlight Solar Power Systems
>> Sent: Monday, September 30, 2013 1:02 PM
>> To: RE-wrenches
>> Subject: [RE-wrenches] Generator automatic disconnect
>>
>> Wrenches,
>>
>> I want to use the Ecogen 6kW generator on a large off grid system. The
>> location has very few overcast or rainy days and the generator will rarely
>> be needed. My concerns is nuisance tripping the generator output breakers
>> if
>> the household load exceeds 6kW. The power system control has a feature for
>> reducing the AC current used to charge the batteries but does not have a
>> feature for disconnecting the AC input based on input load.
>>
>> Does anyone have a solution for monitoring AC load from the generator and
>> disconnect it if overloaded? It must automatically reconnect after a short
>> timeout.
>>
>> Thank you,
>> Larry Crutcher
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