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12 volt pump to replace 110v pump

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Member - Posts: 1
Member spacespace
Joined: January 29, 2011
Posted: January 29, 2011 at 5:59 PM / IP Logged  
hi 12 volt-ers,
my friend heats his home with an outdoor wood furnace that heats water and circulates it into the house thru baseboards. the pump on the little outdoor shed that houses the furnace that pumps the water has these specs:
"cartridge circulator"
1/8 horsepower
1.4 amps
115 volts
rpm 3250
max h2o temp 110 celcius or 230 farenheit
does anyone know of any 12v pumps that would work for this application? or how big a solar system with inverter would be needed if he keeps the original pump? thoughts on the best way to get his pump off the AC grid would be appreciated.
Silver - Posts: 503
Silver spacespace
Joined: November 23, 2003
Location: Canada
Posted: January 30, 2011 at 9:51 PM / IP Logged  
Most places that specilize in solar heating or green energy have dc pumps, you need to know the flow rate ghp  gallons per hour of pump
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: January 31, 2011 at 5:34 AM / IP Logged  
A 300W inverter should handle it (115V x 1.4A = 161VA => 320VA (300W) using motor doubling rule).
If the motor does not handle modified-sine (= 2-level "stepped square wave", then a true-sine inverter is required.
Solar calcs need local data.
Assume 24 hour operation for 200W (assume inverter input is 200W) means AT LEAST 400W of panels, probably more like 600-800W depending.... (now only $3/W - so $1,200 - $2,400W of panels.
Battery - 12V system? (24V or 48V is better...)
Assume 24 hours reserve (no sun) => 200W x 24 = 48000W/12 = 4000AH over 24 hours = 167AH - say 12V 150AH to 160AH @ C20.
[In that scenario, I'd use two 12V 100AH deep cycle with 790 CCA wet-cell monoblocks (batteries) that sell here for about $220 each (compared to RRP $550 for a 75AH Optima blue top). Hence 200AH capacity and able to perform maintenance on one monoblock....
But for solar, I'd get a dc pump (d'oh!).
Why lose >20% by using an inverter?
And add the extra cost and unreliability?
And aren't dc motors more efficient?

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