[RE-wrenches] Propane Generator, Dual Outback Inverters

[Jason Szumlanski]

I should have been a bit more clear about my application. I'm not
worried about battery charging rates or load percentage on the
generator. I've already determined that this size generator will
normally run at a good efficiency level. I am more concerned with the
quality, longevity, and enclosure. I have a couple of applications in
mind, but my immediate need is for a mobile environment. The generator
might be subject to some degree of road spray and it will be used in a
near-ocean environment.

I've had some good and bad experiences with gas gennys. Someone
recommended an Onan, a brand I swore never to use again after I replaced
a $700 controller three times in a year (at my cost) and Onan was zero
help in trying to diagnose the problem. They tried to blame it on
surging when the inverter/chargers kicked in. Anyway, I'd be willing to
try again if I get some good feedback. Cost is always an issue, and I
know the Onan's can be pricey.


Jason Szumlanski
Fafco Solar

-----Original Message-----

Can you say something more about the system?  Is there a PV component?
What
is the size and type of the battery bank?

The thing I am beginning to understand about propane generators is that
there is a problem with Outback charging re: partial load efficiency.
If
the generator/chargers are sized to give a good C/10 bulk charge rate,
then
they will be running well below 50% load when they are providing a
desirable
absorption phase current. That's extended absorption run times at poor
generator efficiencies. This also plays into having a generator that is
sized for full AC loads and full charger currents. If you design for
this
case, but do not have large AC loads during charging, you will be well
down
into the 25% load on the gererator, very inefficient with propane.

I have had very good success with my Kohler 30kw REGZ 2-wire start
propane
generator in a lower elevation, California foothills location.

What exactly do you mean by harsh environment?

Mark Frye
Berkeley Solar Electric Systems
303 Redbud Way
Nevada City,  CA 95959
(530) 401-8024
www.berkeleysolar.com