[RE-wrenches] paralleling FM-60's
jay peltz
jay at asis.com
Wed Oct 20 12:16:42 PDT 2010
All good ideas.
thanks,
jay
On Oct 20, 2010, at 11:56 AM, R Ray Walters wrote:
> I second Allan's move to 48 v; that's usually what we've ended up doing in very similar situations, to keep the existing 'monsta' cable.
> Usually they have a dated mod sine inverter, so the upgrade to Outback improves the system coming and going.
> As much as I loved the SW series inverters, their time has come and gone. They don't last forever, and even if parts are available, they're almost $1200 to repair.
>
> R. Walters
> ray at solarray.com
> Solar Engineer
>
>
>
>
> On Oct 20, 2010, at 12:37 PM, Allan Sindelar wrote:
>
>> Jay,
>> When we faced this issue recently, we used it as an opportunity to upgrade to a 48V system. The obsolescence and lack of Schneider support for the SW4024 contributed to the logic of this approach.
>>
>> At 48V an MX60 will handle 3200 watts.
>>
>> Allan Sindelar
>> Allan at positiveenergysolar.com
>> NABCEP Certified Photovoltaic Installer
>> EE98J Journeyman Electrician
>> Positive Energy, Inc.
>> 3201 Calle Marie
>> Santa Fe, New Mexico 87507
>> 505 424-1112
>> www.positiveenergysolar.com
>>
>> On 10/20/2010 11:58 AM, jay peltz wrote:
>>>
>>> Hi Ray et all,
>>>
>>> The customer has 200' of 4/0 direct buried with a 24v system, and is running close to 60 amps now, and wants to add 6 more 215 watt modules.
>>> So the issue has been to try and find a way around putting in another wire ie digging a new trench through his yard.
>>>
>>> the client may be willing to try and see how it goes with the controllers, at this point hes aware that it could blow up and its not a warranty issue.
>>>
>>> Will keep you up to date about what smokes or not.
>>>
>>> j
>>>
>>> peltz power
>>>
>>> On Oct 20, 2010, at 10:18 AM, R Ray Walters wrote:
>>>
>>>> Hi Jay;
>>>>
>>>> I'd second (3rd, 4th?) everyone else's comments that it probably isn't a good idea.
>>>> I'd add that the diode will eat at least a volt, so that's not good for MPPT, or balancing.
>>>> The one possible way to do this, might be to use a Vanner battery equalizer, which is designed to split an incoming charge source, and feed 2 batteries, without letting them
>>>> "see" each other. I think they're only good for 24 v, though, so that might not work for your situation.
>>>> The only other way I could see, is using a huge relay ( or paralleled relays) controlled by a C40 (or similar). You would lose both MPPT and PWM, and be back in the solar stone age (90s) though.
>>>>
>>>> TIme to pull out the 2 big cables, and pull 4 smaller ones?
>>>> Have fun, I actually like retrofitting old off grid stuff; it presents all sorts of interesting challenges like this.
>>>>
>>>> R. Walters
>>>> ray at solarray.com
>>>> Solar Engineer
>>>>
>>>>
>>> _______________________________________________
>>> List sponsored by Home Power magazine
>>>
>>> List Address: RE-wrenches at lists.re-wrenches.org
>>>
>>> Options & settings:
>>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>>
>>> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>>
>>> List rules & etiquette:
>>> www.re-wrenches.org/etiquette.htm
>>>
>>> Check out participant bios:
>>> www.members.re-wrenches.org
>>>
>>>
>> _______________________________________________
>> List sponsored by Home Power magazine
>>
>> List Address: RE-wrenches at lists.re-wrenches.org
>>
>> Options & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>>
>> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>>
>> List rules & etiquette:
>> www.re-wrenches.org/etiquette.htm
>>
>> Check out participant bios:
>> www.members.re-wrenches.org
>>
>
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20101020/fccab48c/attachment-0004.html>
More information about the RE-wrenches
mailing list