Hydro and PV diversion, part II [RE-wrenches]
Bob-O Schultze, Electron Connection
econnect at snowcrest.net
Thu Apr 22 12:50:21 PDT 2004
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Hiya Gary and Gang,
In the first place, if you are going to set up a diversion type
charge controller system which incorporates the PVs and the hydro,
you need two. See 690.72 (B)(1). I generally do this anyway in a
hydro system because I hate service calls. A C40 into a 1500W-120V
water heating element (or two) would be my first choice. If I've done
my math right, one element should dump about 315W when fed 55.2VDC.
Morningstar's new TriStar should work OK too, but until they pony up
the UL listing vigorish like everyone else has to do, I'm not going
there.
I set the bulk voltage to 55.2 or so. Lower than I would with a
series CC in a PV system. Your batteries will likely spend a good
deal of time at that voltage. Anything much higher will cause them to
gas lots. For a secondary, I generally use the FX or MX 12V relay to
turn on a 25A Continental Industries solid state relay which will
turn on a cheap 120vac air heater. You can find them with 500W, 750W,
1500W settings to match your inputs. Set the on voltage a few tenths
higher than the bulk on the C40 and the off voltage about 4-5V lower.
If you use this set-up, make DAMN sure your T&P valve works well and
is vented to the outside, cause it may get a workout. Steam bath
anyone?
In your particular scenario, where the PV wattage is SO much higher
than the hydro AND you've got a MX60 anyway, I'd use the MX to ride
herd on the PVs in series mode and a C40 to dump to a DC water
heating element. 500W is FAR less likely to cause a steam bath than
2900W, yet should still heat a fair amount of water. The ac air dump
would still be nice. If you use it, set the turn on voltage higher
than the other controllers. Since you want the system to heat water
on a regular basis, I'd set the C40 as above, the MX to whatever you
would usually set for a PV system, and the air dump a bit higher.
Good Luck, bob-O
--
Bob-O Schultze, Electron Connection
PO Box 203, Hornbrook, CA 96044
800.945.7587 or 530.475.3402
fax 530-475-3401
www.electronconnection.com
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