OT- Small - Automatic - Generators...?
Somebody wrote:
I wonder if a solar or wind powered charger would be sufficient for
the battery backup on the sump pump.
NBD
80W solar panels are less than $500.
T-105, 6VDC, golf cart batteries are less than $65.
A small inverter is less than $500.
Assume the sump pump requires 2A and operates on a 50% duty cycle
which would require 240W/hour.
I use 50% efficiency of solar cells for estimating, thus (80W)50% =
40W.
240W/40W = 6 panels or about $3,000.
T-105 are rated about 235AH.
If you cycle them between 70%-90%, they provide about 47AH/pair at
12VDC.
240W/47AH = 5 sets of batteries minimum, I'd probably use 6 sets or 12
batteries,
thus (12)$65)=$780
Panels....................$3000
Batteries..................$800
Inverter....................$500
Misc hardware.........$500
Total......................$4800
Use $5000 as an estimate to achieve total independance from an
unreliable supplier.
Lew
|