[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
>>>> 
>>>> 
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