[RE-wrenches] Battery charging problems

[Ray Walters]

That doesn't make sense,  the inverter's charger determines the max 
charge rate and the max draw from the generator.
The 8.5 kW Kohler should have no problem running the 4.4 kW Magnum.    
What is the altitude?
Is it wired for 240 vac ?  If the generator is running at 120 vac, then 
you are only running on one leg and hence operating at half power.
It will also lead to long term damage of the generator.   Its like 
pedaling a bicycle with one pedal.
The Magnum MS4448 PAE is designed for 240vac input.
The problem might only be showing itself now, because the new batteries 
are actually requiring closer to full charger power from the Magnum.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 4/21/2016 1:40 PM, Chris Daum wrote:
>   Dear people:
>
> I have an off-grid customer who has, in his system, a Magnum MS4448 and 16
> of the Rolls S550 batteries, a Kohler generator (and Trimetric meter and
> other components).  He upgraded his batteries this past March, and since
> he's installed his new batteries, the generator is running 'rough'.  He's at
> a great distance from our shop so a local business helps him from time to
> time. They believe that the "batteries are too  powerful for the 8.5 kw
> generator" and recommended  running it at 50 percent charge control. After 3
> hrs run, it seems to help but will mean more run time for his generator (and
> hence, use more fuel).  Have you ever heard of anything like this?
> Everything ran fund before the battery upgrade.
>
> Thanks for your input!
>
> Best,
>
> Chris Daum
> Oasis Montana Inc.
> 406-777-4309
> 406-777-0830 fax
> www.oasismontana.com
>
>
>
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