Off-gridders,
Checked in on a 13 year old system and something caught my
eye. Yes, everything is 13 years old. First off: PVs: 14 (7 strings of
2 PVs each), Shell 150's, batts: HUP 845 AHR, 48 volt system, MX60 CC.
So the MX60 was reading (mid day) ~1500 watts or ~27 amps (somewhat low
for the array but acceptable considering age, soiling, tilt, etc.
Regardless, Volts "IN" were 58, batt volts were ~53.5. This info was
taken from the MX display.
For PVs that have an MPPT rating of 45.5 volts ( X 2 per
string = 91V), that 58 volts seems especially low. Normal?? Possible
one string is pulling down the rest? Feedback welcome.
Bill
Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
www.frenergy.net
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